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apache / tomcat80 / e97d800579ba3adaf2ee25a9edb4dcf9d064e676 / . / java / org / apache / tomcat / util / digester / Digester.java
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.tomcat.util.digester;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.InvocationTargetException;
import java.net.URI;
import java.net.URISyntaxException;
import java.security.Permission;
import java.util.EmptyStackException;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.PropertyPermission;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import org.apache.juli.logging.Log;
import org.apache.juli.logging.LogFactory;
import org.apache.tomcat.util.ExceptionUtils;
import org.apache.tomcat.util.IntrospectionUtils;
import org.apache.tomcat.util.security.PermissionCheck;
import org.xml.sax.Attributes;
import org.xml.sax.EntityResolver;
import org.xml.sax.ErrorHandler;
import org.xml.sax.InputSource;
import org.xml.sax.Locator;
import org.xml.sax.SAXException;
import org.xml.sax.SAXNotRecognizedException;
import org.xml.sax.SAXNotSupportedException;
import org.xml.sax.SAXParseException;
import org.xml.sax.XMLReader;
import org.xml.sax.ext.DefaultHandler2;
import org.xml.sax.ext.Locator2;
import org.xml.sax.helpers.AttributesImpl;
/**
* <p>A <strong>Digester</strong> processes an XML input stream by matching a
* series of element nesting patterns to execute Rules that have been added
* prior to the start of parsing. This package was inspired by the
* <code>XmlMapper</code> class that was part of Tomcat 3.0 and 3.1,
* but is organized somewhat differently.</p>
*
* <p>See the <a href="package-summary.html#package_description">Digester
* Developer Guide</a> for more information.</p>
*
* <p><strong>IMPLEMENTATION NOTE</strong> - A single Digester instance may
* only be used within the context of a single thread at a time, and a call
* to <code>parse()</code> must be completed before another can be initiated
* even from the same thread.</p>
*
* <p><strong>IMPLEMENTATION NOTE</strong> - A bug in Xerces 2.0.2 prevents
* the support of XML schema. You need Xerces 2.1/2.3 and up to make
* this class working with XML schema</p>
*/
public class Digester extends DefaultHandler2 {
// ---------------------------------------------------------- Static Fields
protected static IntrospectionUtils.PropertySource propertySource = null;
static {
String className = System.getProperty("org.apache.tomcat.util.digester.PROPERTY_SOURCE");
if (className != null) {
ClassLoader[] cls = new ClassLoader[] { Digester.class.getClassLoader(),
Thread.currentThread().getContextClassLoader() };
for (int i = 0; i < cls.length; i++) {
try {
Class<?> clazz = Class.forName(className, true, cls[i]);
propertySource = (IntrospectionUtils.PropertySource)
clazz.getConstructor().newInstance();
break;
} catch (Throwable t) {
ExceptionUtils.handleThrowable(t);
LogFactory.getLog("org.apache.tomcat.util.digester.Digester")
.error("Unable to load property source[" + className + "].", t);
}
}
}
}
// --------------------------------------------------- Instance Variables
private class SystemPropertySource implements IntrospectionUtils.PropertySource {
@Override
public String getProperty(String key) {
ClassLoader cl = getClassLoader();
if (cl instanceof PermissionCheck) {
Permission p = new PropertyPermission(key, "read");
if (!((PermissionCheck) cl).check(p)) {
return null;
}
}
return System.getProperty(key);
}
}
protected IntrospectionUtils.PropertySource source[] = new IntrospectionUtils.PropertySource[] {
new SystemPropertySource() };
/**
* The body text of the current element.
*/
protected StringBuilder bodyText = new StringBuilder();
/**
* The stack of body text string buffers for surrounding elements.
*/
protected ArrayStack<StringBuilder> bodyTexts = new ArrayStack<>();
/**
* Stack whose elements are List objects, each containing a list of
* Rule objects as returned from Rules.getMatch(). As each xml element
* in the input is entered, the matching rules are pushed onto this
* stack. After the end tag is reached, the matches are popped again.
* The depth of is stack is therefore exactly the same as the current
* "nesting" level of the input xml.
*
* @since 1.6
*/
protected ArrayStack<List<Rule>> matches = new ArrayStack<>(10);
/**
* The class loader to use for instantiating application objects.
* If not specified, the context class loader, or the class loader
* used to load Digester itself, is used, based on the value of the
* <code>useContextClassLoader</code> variable.
*/
protected ClassLoader classLoader = null;
/**
* Has this Digester been configured yet.
*/
protected boolean configured = false;
/**
* The EntityResolver used by the SAX parser. By default it use this class
*/
protected EntityResolver entityResolver;
/**
* The URLs of entityValidator that have been registered, keyed by the public
* identifier that corresponds.
*/
protected HashMap<String, String> entityValidator = new HashMap<>();
/**
* The application-supplied error handler that is notified when parsing
* warnings, errors, or fatal errors occur.
*/
protected ErrorHandler errorHandler = null;
/**
* The SAXParserFactory that is created the first time we need it.
*/
protected SAXParserFactory factory = null;
/**
* The Locator associated with our parser.
*/
protected Locator locator = null;
/**
* The current match pattern for nested element processing.
*/
protected String match = "";
/**
* Do we want a "namespace aware" parser.
*/
protected boolean namespaceAware = false;
/**
* Registered namespaces we are currently processing. The key is the
* namespace prefix that was declared in the document. The value is an
* ArrayStack of the namespace URIs this prefix has been mapped to --
* the top Stack element is the most current one. (This architecture
* is required because documents can declare nested uses of the same
* prefix for different Namespace URIs).
*/
protected HashMap<String, ArrayStack<String>> namespaces = new HashMap<>();
/**
* The parameters stack being utilized by CallMethodRule and
* CallParamRule rules.
*/
protected ArrayStack<Object> params = new ArrayStack<>();
/**
* The SAXParser we will use to parse the input stream.
*/
protected SAXParser parser = null;
/**
* The public identifier of the DTD we are currently parsing under
* (if any).
*/
protected String publicId = null;
/**
* The XMLReader used to parse digester rules.
*/
protected XMLReader reader = null;
/**
* The "root" element of the stack (in other words, the last object
* that was popped.
*/
protected Object root = null;
/**
* The <code>Rules</code> implementation containing our collection of
* <code>Rule</code> instances and associated matching policy. If not
* established before the first rule is added, a default implementation
* will be provided.
*/
protected Rules rules = null;
/**
* The object stack being constructed.
*/
protected ArrayStack<Object> stack = new ArrayStack<>();
/**
* Do we want to use the Context ClassLoader when loading classes
* for instantiating new objects. Default is <code>false</code>.
*/
protected boolean useContextClassLoader = false;
/**
* Do we want to use a validating parser.
*/
protected boolean validating = false;
/**
* Warn on missing attributes and elements.
*/
protected boolean rulesValidation = false;
/**
* Fake attributes map (attributes are often used for object creation).
*/
protected Map<Class<?>, List<String>> fakeAttributes = null;
/**
* The Log to which most logging calls will be made.
*/
protected Log log = LogFactory.getLog(Digester.class);
/**
* The Log to which all SAX event related logging calls will be made.
*/
protected Log saxLog = LogFactory.getLog("org.apache.tomcat.util.digester.Digester.sax");
public Digester() {
if (propertySource != null) {
source = new IntrospectionUtils.PropertySource[] { propertySource, source[0] };
}
}
// ------------------------------------------------------------- Properties
/**
* Return the currently mapped namespace URI for the specified prefix,
* if any; otherwise return <code>null</code>. These mappings come and
* go dynamically as the document is parsed.
*
* @param prefix Prefix to look up
*/
public String findNamespaceURI(String prefix) {
ArrayStack<String> stack = namespaces.get(prefix);
if (stack == null) {
return (null);
}
try {
return stack.peek();
} catch (EmptyStackException e) {
return (null);
}
}
/**
* Return the class loader to be used for instantiating application objects
* when required. This is determined based upon the following rules:
* <ul>
* <li>The class loader set by <code>setClassLoader()</code>, if any</li>
* <li>The thread context class loader, if it exists and the
* <code>useContextClassLoader</code> property is set to true</li>
* <li>The class loader used to load the Digester class itself.
* </ul>
*/
public ClassLoader getClassLoader() {
if (this.classLoader != null) {
return (this.classLoader);
}
if (this.useContextClassLoader) {
ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
if (classLoader != null) {
return (classLoader);
}
}
return (this.getClass().getClassLoader());
}
/**
* Set the class loader to be used for instantiating application objects
* when required.
*
* @param classLoader The new class loader to use, or <code>null</code>
* to revert to the standard rules
*/
public void setClassLoader(ClassLoader classLoader) {
this.classLoader = classLoader;
}
/**
* Return the current depth of the element stack.
*/
public int getCount() {
return (stack.size());
}
/**
* Return the name of the XML element that is currently being processed.
*/
public String getCurrentElementName() {
String elementName = match;
int lastSlash = elementName.lastIndexOf('/');
if (lastSlash >= 0) {
elementName = elementName.substring(lastSlash + 1);
}
return (elementName);
}
/**
* Return the error handler for this Digester.
*/
public ErrorHandler getErrorHandler() {
return (this.errorHandler);
}
/**
* Set the error handler for this Digester.
*
* @param errorHandler The new error handler
*/
public void setErrorHandler(ErrorHandler errorHandler) {
this.errorHandler = errorHandler;
}
/**
* Return the SAXParserFactory we will use, creating one if necessary.
* @throws ParserConfigurationException
* @throws SAXNotSupportedException
* @throws SAXNotRecognizedException
*/
public SAXParserFactory getFactory() throws SAXNotRecognizedException, SAXNotSupportedException,
ParserConfigurationException {
if (factory == null) {
factory = SAXParserFactory.newInstance();
factory.setNamespaceAware(namespaceAware);
// Preserve xmlns attributes
if (namespaceAware) {
factory.setFeature("http://xml.org/sax/features/namespace-prefixes", true);
}
factory.setValidating(validating);
if (validating) {
// Enable DTD validation
factory.setFeature("http://xml.org/sax/features/validation", true);
// Enable schema validation
factory.setFeature("http://apache.org/xml/features/validation/schema", true);
}
}
return (factory);
}
/**
* Sets a flag indicating whether the requested feature is supported
* by the underlying implementation of <code>org.xml.sax.XMLReader</code>.
* See <a href="http://www.saxproject.org/apidoc/xml/sax/package-summary.html#package-description">
* http://www.saxproject.org/apidoc/xml/sax/package-summary.html#package-description</a>
* for information about the standard SAX2 feature flags. In order to be
* effective, this method must be called <strong>before</strong> the
* <code>getParser()</code> method is called for the first time, either
* directly or indirectly.
*
* @param feature Name of the feature to set the status for
* @param value The new value for this feature
*
* @exception ParserConfigurationException if a parser configuration error
* occurs
* @exception SAXNotRecognizedException if the property name is
* not recognized
* @exception SAXNotSupportedException if the property name is
* recognized but not supported
*/
public void setFeature(String feature, boolean value) throws ParserConfigurationException,
SAXNotRecognizedException, SAXNotSupportedException {
getFactory().setFeature(feature, value);
}
/**
* Return the current Logger associated with this instance of the Digester
*/
public Log getLogger() {
return log;
}
/**
* Set the current logger for this Digester.
*/
public void setLogger(Log log) {
this.log = log;
}
/**
* Gets the logger used for logging SAX-related information.
* <strong>Note</strong> the output is finely grained.
*
* @since 1.6
*/
public Log getSAXLogger() {
return saxLog;
}
/**
* Sets the logger used for logging SAX-related information.
* <strong>Note</strong> the output is finely grained.
* @param saxLog Log, not null
*
* @since 1.6
*/
public void setSAXLogger(Log saxLog) {
this.saxLog = saxLog;
}
/**
* Return the current rule match path
*/
public String getMatch() {
return match;
}
/**
* Return the "namespace aware" flag for parsers we create.
*/
public boolean getNamespaceAware() {
return (this.namespaceAware);
}
/**
* Set the "namespace aware" flag for parsers we create.
*
* @param namespaceAware The new "namespace aware" flag
*/
public void setNamespaceAware(boolean namespaceAware) {
this.namespaceAware = namespaceAware;
}
/**
* Set the public id of the current file being parse.
* @param publicId the DTD/Schema public's id.
*/
public void setPublicId(String publicId) {
this.publicId = publicId;
}
/**
* Return the public identifier of the DTD we are currently
* parsing under, if any.
*/
public String getPublicId() {
return (this.publicId);
}
/**
* Return the namespace URI that will be applied to all subsequently
* added <code>Rule</code> objects.
*/
public String getRuleNamespaceURI() {
return (getRules().getNamespaceURI());
}
/**
* Set the namespace URI that will be applied to all subsequently
* added <code>Rule</code> objects.
*
* @param ruleNamespaceURI Namespace URI that must match on all
* subsequently added rules, or <code>null</code> for matching
* regardless of the current namespace URI
*/
public void setRuleNamespaceURI(String ruleNamespaceURI) {
getRules().setNamespaceURI(ruleNamespaceURI);
}
/**
* Return the SAXParser we will use to parse the input stream. If there
* is a problem creating the parser, return <code>null</code>.
*/
public SAXParser getParser() {
// Return the parser we already created (if any)
if (parser != null) {
return (parser);
}
// Create a new parser
try {
parser = getFactory().newSAXParser();
} catch (Exception e) {
log.error("Digester.getParser: ", e);
return (null);
}
return (parser);
}
/**
* Return the current value of the specified property for the underlying
* <code>XMLReader</code> implementation.
* See <a href="http://www.saxproject.org/apidoc/xml/sax/package-summary.html#package-description">
* http://www.saxproject.org/apidoc/xml/sax/package-summary.html#package-description</a>
* for information about the standard SAX2 properties.
*
* @param property Property name to be retrieved
*
* @exception SAXNotRecognizedException if the property name is
* not recognized
* @exception SAXNotSupportedException if the property name is
* recognized but not supported
*/
public Object getProperty(String property)
throws SAXNotRecognizedException, SAXNotSupportedException {
return (getParser().getProperty(property));
}
/**
* Return the <code>Rules</code> implementation object containing our
* rules collection and associated matching policy. If none has been
* established, a default implementation will be created and returned.
*/
public Rules getRules() {
if (this.rules == null) {
this.rules = new RulesBase();
this.rules.setDigester(this);
}
return (this.rules);
}
/**
* Set the <code>Rules</code> implementation object containing our
* rules collection and associated matching policy.
*
* @param rules New Rules implementation
*/
public void setRules(Rules rules) {
this.rules = rules;
this.rules.setDigester(this);
}
/**
* Return the boolean as to whether the context classloader should be used.
*/
public boolean getUseContextClassLoader() {
return useContextClassLoader;
}
/**
* Determine whether to use the Context ClassLoader (the one found by
* calling <code>Thread.currentThread().getContextClassLoader()</code>)
* to resolve/load classes that are defined in various rules. If not
* using Context ClassLoader, then the class-loading defaults to
* using the calling-class' ClassLoader.
*
* @param use determines whether to use Context ClassLoader.
*/
public void setUseContextClassLoader(boolean use) {
useContextClassLoader = use;
}
/**
* Return the validating parser flag.
*/
public boolean getValidating() {
return (this.validating);
}
/**
* Set the validating parser flag. This must be called before
* <code>parse()</code> is called the first time.
*
* @param validating The new validating parser flag.
*/
public void setValidating(boolean validating) {
this.validating = validating;
}
/**
* Return the rules validation flag.
*/
public boolean getRulesValidation() {
return (this.rulesValidation);
}
/**
* Set the rules validation flag. This must be called before
* <code>parse()</code> is called the first time.
*
* @param rulesValidation The new rules validation flag.
*/
public void setRulesValidation(boolean rulesValidation) {
this.rulesValidation = rulesValidation;
}
/**
* Return the fake attributes list.
*/
public Map<Class<?>, List<String>> getFakeAttributes() {
return (this.fakeAttributes);
}
/**
* Determine if an attribute is a fake attribute.
*/
public boolean isFakeAttribute(Object object, String name) {
if (fakeAttributes == null) {
return false;
}
List<String> result = fakeAttributes.get(object.getClass());
if (result == null) {
result = fakeAttributes.get(Object.class);
}
if (result == null) {
return false;
} else {
return result.contains(name);
}
}
/**
* Set the fake attributes.
*
* @param fakeAttributes The new fake attributes.
*/
public void setFakeAttributes(Map<Class<?>, List<String>> fakeAttributes) {
this.fakeAttributes = fakeAttributes;
}
/**
* Return the XMLReader to be used for parsing the input document.
*
* FIX ME: there is a bug in JAXP/XERCES that prevent the use of a
* parser that contains a schema with a DTD.
* @exception SAXException if no XMLReader can be instantiated
*/
public XMLReader getXMLReader() throws SAXException {
if (reader == null) {
reader = getParser().getXMLReader();
}
reader.setDTDHandler(this);
reader.setContentHandler(this);
if (entityResolver == null) {
reader.setEntityResolver(this);
} else {
reader.setEntityResolver(entityResolver);
}
reader.setProperty("http://xml.org/sax/properties/lexical-handler", this);
reader.setErrorHandler(this);
return reader;
}
// ------------------------------------------------- ContentHandler Methods
/**
* Process notification of character data received from the body of
* an XML element.
*
* @param buffer The characters from the XML document
* @param start Starting offset into the buffer
* @param length Number of characters from the buffer
*
* @exception SAXException if a parsing error is to be reported
*/
@Override
public void characters(char buffer[], int start, int length) throws SAXException {
if (saxLog.isDebugEnabled()) {
saxLog.debug("characters(" + new String(buffer, start, length) + ")");
}
bodyText.append(buffer, start, length);
}
/**
* Process notification of the end of the document being reached.
*
* @exception SAXException if a parsing error is to be reported
*/
@Override
public void endDocument() throws SAXException {
if (saxLog.isDebugEnabled()) {
if (getCount() > 1) {
saxLog.debug("endDocument(): " + getCount() + " elements left");
} else {
saxLog.debug("endDocument()");
}
}
while (getCount() > 1) {
pop();
}
// Fire "finish" events for all defined rules
Iterator<Rule> rules = getRules().rules().iterator();
while (rules.hasNext()) {
Rule rule = rules.next();
try {
rule.finish();
} catch (Exception e) {
log.error("Finish event threw exception", e);
throw createSAXException(e);
} catch (Error e) {
log.error("Finish event threw error", e);
throw e;
}
}
// Perform final cleanup
clear();
}
/**
* Process notification of the end of an XML element being reached.
*
* @param namespaceURI - The Namespace URI, or the empty string if the
* element has no Namespace URI or if Namespace processing is not
* being performed.
* @param localName - The local name (without prefix), or the empty
* string if Namespace processing is not being performed.
* @param qName - The qualified XML 1.0 name (with prefix), or the
* empty string if qualified names are not available.
* @exception SAXException if a parsing error is to be reported
*/
@Override
public void endElement(String namespaceURI, String localName, String qName)
throws SAXException {
boolean debug = log.isDebugEnabled();
if (debug) {
if (saxLog.isDebugEnabled()) {
saxLog.debug("endElement(" + namespaceURI + "," + localName + "," + qName + ")");
}
log.debug(" match='" + match + "'");
log.debug(" bodyText='" + bodyText + "'");
}
// Parse system properties
bodyText = updateBodyText(bodyText);
// the actual element name is either in localName or qName, depending
// on whether the parser is namespace aware
String name = localName;
if ((name == null) || (name.length() < 1)) {
name = qName;
}
// Fire "body" events for all relevant rules
List<Rule> rules = matches.pop();
if ((rules != null) && (rules.size() > 0)) {
String bodyText = this.bodyText.toString();
for (int i = 0; i < rules.size(); i++) {
try {
Rule rule = rules.get(i);
if (debug) {
log.debug(" Fire body() for " + rule);
}
rule.body(namespaceURI, name, bodyText);
} catch (Exception e) {
log.error("Body event threw exception", e);
throw createSAXException(e);
} catch (Error e) {
log.error("Body event threw error", e);
throw e;
}
}
} else {
if (debug) {
log.debug(" No rules found matching '" + match + "'.");
}
if (rulesValidation) {
log.warn(" No rules found matching '" + match + "'.");
}
}
// Recover the body text from the surrounding element
bodyText = bodyTexts.pop();
// Fire "end" events for all relevant rules in reverse order
if (rules != null) {
for (int i = 0; i < rules.size(); i++) {
int j = (rules.size() - i) - 1;
try {
Rule rule = rules.get(j);
if (debug) {
log.debug(" Fire end() for " + rule);
}
rule.end(namespaceURI, name);
} catch (Exception e) {
log.error("End event threw exception", e);
throw createSAXException(e);
} catch (Error e) {
log.error("End event threw error", e);
throw e;
}
}
}
// Recover the previous match expression
int slash = match.lastIndexOf('/');
if (slash >= 0) {
match = match.substring(0, slash);
} else {
match = "";
}
}
/**
* Process notification that a namespace prefix is going out of scope.
*
* @param prefix Prefix that is going out of scope
*
* @exception SAXException if a parsing error is to be reported
*/
@Override
public void endPrefixMapping(String prefix) throws SAXException {
if (saxLog.isDebugEnabled()) {
saxLog.debug("endPrefixMapping(" + prefix + ")");
}
// Deregister this prefix mapping
ArrayStack<String> stack = namespaces.get(prefix);
if (stack == null) {
return;
}
try {
stack.pop();
if (stack.empty())
namespaces.remove(prefix);
} catch (EmptyStackException e) {
throw createSAXException("endPrefixMapping popped too many times");
}
}
/**
* Process notification of ignorable whitespace received from the body of
* an XML element.
*
* @param buffer The characters from the XML document
* @param start Starting offset into the buffer
* @param len Number of characters from the buffer
*
* @exception SAXException if a parsing error is to be reported
*/
@Override
public void ignorableWhitespace(char buffer[], int start, int len) throws SAXException {
if (saxLog.isDebugEnabled()) {
saxLog.debug("ignorableWhitespace(" + new String(buffer, start, len) + ")");
}
// No processing required
}
/**
* Process notification of a processing instruction that was encountered.
*
* @param target The processing instruction target
* @param data The processing instruction data (if any)
*
* @exception SAXException if a parsing error is to be reported
*/
@Override
public void processingInstruction(String target, String data) throws SAXException {
if (saxLog.isDebugEnabled()) {
saxLog.debug("processingInstruction('" + target + "','" + data + "')");
}
// No processing is required
}
/**
* Gets the document locator associated with our parser.
*
* @return the Locator supplied by the document parser
*/
public Locator getDocumentLocator() {
return locator;
}
/**
* Sets the document locator associated with our parser.
*
* @param locator The new locator
*/
@Override
public void setDocumentLocator(Locator locator) {
if (saxLog.isDebugEnabled()) {
saxLog.debug("setDocumentLocator(" + locator + ")");
}
this.locator = locator;
}
/**
* Process notification of a skipped entity.
*
* @param name Name of the skipped entity
*
* @exception SAXException if a parsing error is to be reported
*/
@Override
public void skippedEntity(String name) throws SAXException {
if (saxLog.isDebugEnabled()) {
saxLog.debug("skippedEntity(" + name + ")");
}
// No processing required
}
/**
* Process notification of the beginning of the document being reached.
*
* @exception SAXException if a parsing error is to be reported
*/
@Override
public void startDocument() throws SAXException {
if (saxLog.isDebugEnabled()) {
saxLog.debug("startDocument()");
}
if (locator instanceof Locator2 && root instanceof DocumentProperties.Encoding) {
((DocumentProperties.Encoding) root).setEncoding(((Locator2) locator).getEncoding());
}
// ensure that the digester is properly configured, as
// the digester could be used as a SAX ContentHandler
// rather than via the parse() methods.
configure();
}
/**
* Process notification of the start of an XML element being reached.
*
* @param namespaceURI The Namespace URI, or the empty string if the element
* has no Namespace URI or if Namespace processing is not being performed.
* @param localName The local name (without prefix), or the empty
* string if Namespace processing is not being performed.
* @param qName The qualified name (with prefix), or the empty
* string if qualified names are not available.\
* @param list The attributes attached to the element. If there are
* no attributes, it shall be an empty Attributes object.
* @exception SAXException if a parsing error is to be reported
*/
@Override
public void startElement(String namespaceURI, String localName, String qName, Attributes list)
throws SAXException {
boolean debug = log.isDebugEnabled();
if (saxLog.isDebugEnabled()) {
saxLog.debug("startElement(" + namespaceURI + "," + localName + "," + qName + ")");
}
// Parse system properties
list = updateAttributes(list);
// Save the body text accumulated for our surrounding element
bodyTexts.push(bodyText);
bodyText = new StringBuilder();
// the actual element name is either in localName or qName, depending
// on whether the parser is namespace aware
String name = localName;
if ((name == null) || (name.length() < 1)) {
name = qName;
}
// Compute the current matching rule
StringBuilder sb = new StringBuilder(match);
if (match.length() > 0) {
sb.append('/');
}
sb.append(name);
match = sb.toString();
if (debug) {
log.debug(" New match='" + match + "'");
}
// Fire "begin" events for all relevant rules
List<Rule> rules = getRules().match(namespaceURI, match);
matches.push(rules);
if ((rules != null) && (rules.size() > 0)) {
for (int i = 0; i < rules.size(); i++) {
try {
Rule rule = rules.get(i);
if (debug) {
log.debug(" Fire begin() for " + rule);
}
rule.begin(namespaceURI, name, list);
} catch (Exception e) {
log.error("Begin event threw exception", e);
throw createSAXException(e);
} catch (Error e) {
log.error("Begin event threw error", e);
throw e;
}
}
} else {
if (debug) {
log.debug(" No rules found matching '" + match + "'.");
}
}
}
/**
* Process notification that a namespace prefix is coming in to scope.
*
* @param prefix Prefix that is being declared
* @param namespaceURI Corresponding namespace URI being mapped to
*
* @exception SAXException if a parsing error is to be reported
*/
@Override
public void startPrefixMapping(String prefix, String namespaceURI) throws SAXException {
if (saxLog.isDebugEnabled()) {
saxLog.debug("startPrefixMapping(" + prefix + "," + namespaceURI + ")");
}
// Register this prefix mapping
ArrayStack<String> stack = namespaces.get(prefix);
if (stack == null) {
stack = new ArrayStack<>();
namespaces.put(prefix, stack);
}
stack.push(namespaceURI);
}
// ----------------------------------------------------- DTDHandler Methods
/**
* Receive notification of a notation declaration event.
*
* @param name The notation name
* @param publicId The public identifier (if any)
* @param systemId The system identifier (if any)
*/
@Override
public void notationDecl(String name, String publicId, String systemId) {
if (saxLog.isDebugEnabled()) {
saxLog.debug("notationDecl(" + name + "," + publicId + "," + systemId + ")");
}
}
/**
* Receive notification of an unparsed entity declaration event.
*
* @param name The unparsed entity name
* @param publicId The public identifier (if any)
* @param systemId The system identifier (if any)
* @param notation The name of the associated notation
*/
@Override
public void unparsedEntityDecl(String name, String publicId, String systemId, String notation) {
if (saxLog.isDebugEnabled()) {
saxLog.debug("unparsedEntityDecl(" + name + "," + publicId + "," + systemId + ","
+ notation + ")");
}
}
// ----------------------------------------------- EntityResolver Methods
/**
* Set the <code>EntityResolver</code> used by SAX when resolving
* public id and system id.
* This must be called before the first call to <code>parse()</code>.
* @param entityResolver a class that implement the <code>EntityResolver</code> interface.
*/
public void setEntityResolver(EntityResolver entityResolver) {
this.entityResolver = entityResolver;
}
/**
* Return the Entity Resolver used by the SAX parser.
* @return Return the Entity Resolver used by the SAX parser.
*/
public EntityResolver getEntityResolver() {
return entityResolver;
}
@Override
public InputSource resolveEntity(String name, String publicId, String baseURI, String systemId)
throws SAXException, IOException {
if (saxLog.isDebugEnabled()) {
saxLog.debug(
"resolveEntity('" + publicId + "', '" + systemId + "', '" + baseURI + "')");
}
// Has this system identifier been registered?
String entityURL = null;
if (publicId != null) {
entityURL = entityValidator.get(publicId);
}
if (entityURL == null) {
if (systemId == null) {
// cannot resolve
if (log.isDebugEnabled()) {
log.debug(" Cannot resolve entity: '" + publicId + "'");
}
return (null);
} else {
// try to resolve using system ID
if (log.isDebugEnabled()) {
log.debug(" Trying to resolve using system ID '" + systemId + "'");
}
entityURL = systemId;
// resolve systemId against baseURI if it is not absolute
if (baseURI != null) {
try {
URI uri = new URI(systemId);
if (!uri.isAbsolute()) {
entityURL = new URI(baseURI).resolve(uri).toString();
}
} catch (URISyntaxException e) {
if (log.isDebugEnabled()) {
log.debug("Invalid URI '" + baseURI + "' or '" + systemId + "'");
}
}
}
}
}
// Return an input source to our alternative URL
if (log.isDebugEnabled()) {
log.debug(" Resolving to alternate DTD '" + entityURL + "'");
}
try {
return (new InputSource(entityURL));
} catch (Exception e) {
throw createSAXException(e);
}
}
// ----------------------------------------------- LexicalHandler Methods
@Override
public void startDTD(String name, String publicId, String systemId) throws SAXException {
setPublicId(publicId);
}
// ------------------------------------------------- ErrorHandler Methods
/**
* Forward notification of a parsing error to the application supplied
* error handler (if any).
*
* @param exception The error information
*
* @exception SAXException if a parsing exception occurs
*/
@Override
public void error(SAXParseException exception) throws SAXException {
log.error("Parse Error at line " + exception.getLineNumber() + " column "
+ exception.getColumnNumber() + ": " + exception.getMessage(), exception);
if (errorHandler != null) {
errorHandler.error(exception);
}
}
/**
* Forward notification of a fatal parsing error to the application
* supplied error handler (if any).
*
* @param exception The fatal error information
*
* @exception SAXException if a parsing exception occurs
*/
@Override
public void fatalError(SAXParseException exception) throws SAXException {
log.error("Parse Fatal Error at line " + exception.getLineNumber() + " column "
+ exception.getColumnNumber() + ": " + exception.getMessage(), exception);
if (errorHandler != null) {
errorHandler.fatalError(exception);
}
}
/**
* Forward notification of a parse warning to the application supplied
* error handler (if any).
*
* @param exception The warning information
*
* @exception SAXException if a parsing exception occurs
*/
@Override
public void warning(SAXParseException exception) throws SAXException {
if (errorHandler != null) {
log.warn(
"Parse Warning Error at line " + exception.getLineNumber() + " column "
+ exception.getColumnNumber() + ": " + exception.getMessage(),
exception);
errorHandler.warning(exception);
}
}
// ------------------------------------------------------- Public Methods
/**
* Parse the content of the specified file using this Digester. Returns
* the root element from the object stack (if any).
*
* @param file File containing the XML data to be parsed
*
* @exception IOException if an input/output error occurs
* @exception SAXException if a parsing exception occurs
*/
public Object parse(File file) throws IOException, SAXException {
configure();
InputSource input = new InputSource(new FileInputStream(file));
input.setSystemId("file://" + file.getAbsolutePath());
getXMLReader().parse(input);
return (root);
}
/**
* Parse the content of the specified input source using this Digester.
* Returns the root element from the object stack (if any).
*
* @param input Input source containing the XML data to be parsed
*
* @exception IOException if an input/output error occurs
* @exception SAXException if a parsing exception occurs
*/
public Object parse(InputSource input) throws IOException, SAXException {
configure();
getXMLReader().parse(input);
return (root);
}
/**
* Parse the content of the specified input stream using this Digester.
* Returns the root element from the object stack (if any).
*
* @param input Input stream containing the XML data to be parsed
*
* @exception IOException if an input/output error occurs
* @exception SAXException if a parsing exception occurs
*/
public Object parse(InputStream input) throws IOException, SAXException {
configure();
InputSource is = new InputSource(input);
getXMLReader().parse(is);
return (root);
}
/**
* <p>Register the specified DTD URL for the specified public identifier.
* This must be called before the first call to <code>parse()</code>.
* </p><p>
* <code>Digester</code> contains an internal <code>EntityResolver</code>
* implementation. This maps <code>PUBLICID</code>'s to URLs
* (from which the resource will be loaded). A common use case for this
* method is to register local URLs (possibly computed at runtime by a
* classloader) for DTDs. This allows the performance advantage of using
* a local version without having to ensure every <code>SYSTEM</code>
* URI on every processed xml document is local. This implementation provides
* only basic functionality. If more sophisticated features are required,
* using {@link #setEntityResolver} to set a custom resolver is recommended.
* </p><p>
* <strong>Note:</strong> This method will have no effect when a custom
* <code>EntityResolver</code> has been set. (Setting a custom
* <code>EntityResolver</code> overrides the internal implementation.)
* </p>
* @param publicId Public identifier of the DTD to be resolved
* @param entityURL The URL to use for reading this DTD
*/
public void register(String publicId, String entityURL) {
if (log.isDebugEnabled()) {
log.debug("register('" + publicId + "', '" + entityURL + "'");
}
entityValidator.put(publicId, entityURL);
}
// --------------------------------------------------------- Rule Methods
/**
* <p>Register a new Rule matching the specified pattern.
* This method sets the <code>Digester</code> property on the rule.</p>
*
* @param pattern Element matching pattern
* @param rule Rule to be registered
*/
public void addRule(String pattern, Rule rule) {
rule.setDigester(this);
getRules().add(pattern, rule);
}
/**
* Register a set of Rule instances defined in a RuleSet.
*
* @param ruleSet The RuleSet instance to configure from
*/
public void addRuleSet(RuleSet ruleSet) {
String oldNamespaceURI = getRuleNamespaceURI();
String newNamespaceURI = ruleSet.getNamespaceURI();
if (log.isDebugEnabled()) {
if (newNamespaceURI == null) {
log.debug("addRuleSet() with no namespace URI");
} else {
log.debug("addRuleSet() with namespace URI " + newNamespaceURI);
}
}
setRuleNamespaceURI(newNamespaceURI);
ruleSet.addRuleInstances(this);
setRuleNamespaceURI(oldNamespaceURI);
}
/**
* Add an "call method" rule for a method which accepts no arguments.
*
* @param pattern Element matching pattern
* @param methodName Method name to be called
* @see CallMethodRule
*/
public void addCallMethod(String pattern, String methodName) {
addRule(pattern, new CallMethodRule(methodName));
}
/**
* Add an "call method" rule for the specified parameters.
*
* @param pattern Element matching pattern
* @param methodName Method name to be called
* @param paramCount Number of expected parameters (or zero
* for a single parameter from the body of this element)
* @see CallMethodRule
*/
public void addCallMethod(String pattern, String methodName, int paramCount) {
addRule(pattern, new CallMethodRule(methodName, paramCount));
}
/**
* Add a "call parameter" rule for the specified parameters.
*
* @param pattern Element matching pattern
* @param paramIndex Zero-relative parameter index to set
* (from the body of this element)
* @see CallParamRule
*/
public void addCallParam(String pattern, int paramIndex) {
addRule(pattern, new CallParamRule(paramIndex));
}
/**
* Add a "factory create" rule for the specified parameters.
*
* @param pattern Element matching pattern
* @param creationFactory Previously instantiated ObjectCreationFactory
* to be utilized
* @param ignoreCreateExceptions when <code>true</code> any exceptions thrown during
* object creation will be ignored.
* @see FactoryCreateRule
*/
public void addFactoryCreate(String pattern, ObjectCreationFactory creationFactory,
boolean ignoreCreateExceptions) {
creationFactory.setDigester(this);
addRule(pattern, new FactoryCreateRule(creationFactory, ignoreCreateExceptions));
}
/**
* Add an "object create" rule for the specified parameters.
*
* @param pattern Element matching pattern
* @param className Java class name to be created
* @see ObjectCreateRule
*/
public void addObjectCreate(String pattern, String className) {
addRule(pattern, new ObjectCreateRule(className));
}
/**
* Add an "object create" rule for the specified parameters.
*
* @param pattern Element matching pattern
* @param className Default Java class name to be created
* @param attributeName Attribute name that optionally overrides
* the default Java class name to be created
* @see ObjectCreateRule
*/
public void addObjectCreate(String pattern, String className, String attributeName) {
addRule(pattern, new ObjectCreateRule(className, attributeName));
}
/**
* Add a "set next" rule for the specified parameters.
*
* @param pattern Element matching pattern
* @param methodName Method name to call on the parent element
* @param paramType Java class name of the expected parameter type
* (if you wish to use a primitive type, specify the corresponding
* Java wrapper class instead, such as <code>java.lang.Boolean</code>
* for a <code>boolean</code> parameter)
* @see SetNextRule
*/
public void addSetNext(String pattern, String methodName, String paramType) {
addRule(pattern, new SetNextRule(methodName, paramType));
}
/**
* Add a "set properties" rule for the specified parameters.
*
* @param pattern Element matching pattern
* @see SetPropertiesRule
*/
public void addSetProperties(String pattern) {
addRule(pattern, new SetPropertiesRule());
}
// --------------------------------------------------- Object Stack Methods
/**
* Clear the current contents of the object stack.
* <p>
* Calling this method <i>might</i> allow another document of the same type
* to be correctly parsed. However this method was not intended for this
* purpose. In general, a separate Digester object should be created for
* each document to be parsed.
*/
public void clear() {
match = "";
bodyTexts.clear();
params.clear();
publicId = null;
stack.clear();
log = null;
saxLog = null;
configured = false;
}
public void reset() {
root = null;
setErrorHandler(null);
clear();
}
/**
* Return the top object on the stack without removing it. If there are
* no objects on the stack, return <code>null</code>.
*/
public Object peek() {
try {
return (stack.peek());
} catch (EmptyStackException e) {
log.warn("Empty stack (returning null)");
return (null);
}
}
/**
* Return the n'th object down the stack, where 0 is the top element
* and [getCount()-1] is the bottom element. If the specified index
* is out of range, return <code>null</code>.
*
* @param n Index of the desired element, where 0 is the top of the stack,
* 1 is the next element down, and so on.
*/
public Object peek(int n) {
try {
return (stack.peek(n));
} catch (EmptyStackException e) {
log.warn("Empty stack (returning null)");
return (null);
}
}
/**
* Pop the top object off of the stack, and return it. If there are
* no objects on the stack, return <code>null</code>.
*/
public Object pop() {
try {
return (stack.pop());
} catch (EmptyStackException e) {
log.warn("Empty stack (returning null)");
return (null);
}
}
/**
* Push a new object onto the top of the object stack.
*
* @param object The new object
*/
public void push(Object object) {
if (stack.size() == 0) {
root = object;
}
stack.push(object);
}
/**
* When the Digester is being used as a SAXContentHandler,
* this method allows you to access the root object that has been
* created after parsing.
*
* @return the root object that has been created after parsing
* or null if the digester has not parsed any XML yet.
*/
public Object getRoot() {
return root;
}
// ------------------------------------------------ Parameter Stack Methods
// ------------------------------------------------------ Protected Methods
/**
* <p>
* Provide a hook for lazy configuration of this <code>Digester</code>
* instance. The default implementation does nothing, but subclasses
* can override as needed.
* </p>
*
* <p>
* <strong>Note</strong> This method may be called more than once.
* </p>
*/
protected void configure() {
// Do not configure more than once
if (configured) {
return;
}
log = LogFactory.getLog("org.apache.tomcat.util.digester.Digester");
saxLog = LogFactory.getLog("org.apache.tomcat.util.digester.Digester.sax");
// Set the configuration flag to avoid repeating
configured = true;
}
/**
* <p>Return the top object on the parameters stack without removing it. If there are
* no objects on the stack, return <code>null</code>.</p>
*
* <p>The parameters stack is used to store <code>CallMethodRule</code> parameters.
* See {@link #params}.</p>
*/
public Object peekParams() {
try {
return (params.peek());
} catch (EmptyStackException e) {
log.warn("Empty stack (returning null)");
return (null);
}
}
/**
* <p>Pop the top object off of the parameters stack, and return it. If there are
* no objects on the stack, return <code>null</code>.</p>
*
* <p>The parameters stack is used to store <code>CallMethodRule</code> parameters.
* See {@link #params}.</p>
*/
public Object popParams() {
try {
if (log.isTraceEnabled()) {
log.trace("Popping params");
}
return (params.pop());
} catch (EmptyStackException e) {
log.warn("Empty stack (returning null)");
return (null);
}
}
/**
* <p>Push a new object onto the top of the parameters stack.</p>
*
* <p>The parameters stack is used to store <code>CallMethodRule</code> parameters.
* See {@link #params}.</p>
*
* @param object The new object
*/
public void pushParams(Object object) {
if (log.isTraceEnabled()) {
log.trace("Pushing params");
}
params.push(object);
}
/**
* Create a SAX exception which also understands about the location in
* the digester file where the exception occurs
*
* @return the new exception
*/
public SAXException createSAXException(String message, Exception e) {
if ((e != null) && (e instanceof InvocationTargetException)) {
Throwable t = e.getCause();
if (t instanceof ThreadDeath) {
throw (ThreadDeath) t;
}
if (t instanceof VirtualMachineError) {
throw (VirtualMachineError) t;
}
if (t instanceof Exception) {
e = (Exception) t;
}
}
if (locator != null) {
String error = "Error at (" + locator.getLineNumber() + ", " + locator.getColumnNumber()
+ ") : " + message;
if (e != null) {
return new SAXParseException(error, locator, e);
} else {
return new SAXParseException(error, locator);
}
}
log.error("No Locator!");
if (e != null) {
return new SAXException(message, e);
} else {
return new SAXException(message);
}
}
/**
* Create a SAX exception which also understands about the location in
* the digester file where the exception occurs
*
* @return the new exception
*/
public SAXException createSAXException(Exception e) {
if (e instanceof InvocationTargetException) {
Throwable t = e.getCause();
if (t instanceof ThreadDeath) {
throw (ThreadDeath) t;
}
if (t instanceof VirtualMachineError) {
throw (VirtualMachineError) t;
}
if (t instanceof Exception) {
e = (Exception) t;
}
}
return createSAXException(e.getMessage(), e);
}
/**
* Create a SAX exception which also understands about the location in
* the digester file where the exception occurs
*
* @return the new exception
*/
public SAXException createSAXException(String message) {
return createSAXException(message, null);
}
// ------------------------------------------------------- Private Methods
/**
* Returns an attributes list which contains all the attributes
* passed in, with any text of form "${xxx}" in an attribute value
* replaced by the appropriate value from the system property.
*/
private Attributes updateAttributes(Attributes list) {
if (list.getLength() == 0) {
return list;
}
AttributesImpl newAttrs = new AttributesImpl(list);
int nAttributes = newAttrs.getLength();
for (int i = 0; i < nAttributes; ++i) {
String value = newAttrs.getValue(i);
try {
String newValue = IntrospectionUtils.replaceProperties(value, null, source);
if (value != newValue) {
newAttrs.setValue(i, newValue);
}
} catch (Exception e) {
log.warn("Attribute [" + newAttrs.getLocalName(i) + "] failed to update and remains [" + value + "].", e);
}
}
return newAttrs;
}
/**
* Return a new StringBuilder containing the same contents as the
* input buffer, except that data of form ${varname} have been
* replaced by the value of that var as defined in the system property.
*/
private StringBuilder updateBodyText(StringBuilder bodyText) {
String in = bodyText.toString();
String out;
try {
out = IntrospectionUtils.replaceProperties(in, null, source);
} catch (Exception e) {
return bodyText; // return unchanged data
}
if (out == in) {
// No substitutions required. Don't waste memory creating
// a new buffer
return bodyText;
} else {
return new StringBuilder(out);
}
}
}