| /* |
| * 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. |
| */ |
| /* |
| * $Id$ |
| */ |
| |
| |
| package org.apache.xalan.xsltc.trax; |
| |
| import java.io.IOException; |
| import java.util.ArrayList; |
| import java.util.Hashtable; |
| import java.util.List; |
| import java.util.Stack; |
| |
| import org.apache.xalan.xsltc.dom.SAXImpl; |
| import org.w3c.dom.NamedNodeMap; |
| import org.w3c.dom.Node; |
| import org.xml.sax.ContentHandler; |
| import org.xml.sax.DTDHandler; |
| 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.XMLReader; |
| import org.xml.sax.ext.LexicalHandler; |
| import org.xml.sax.helpers.AttributesImpl; |
| |
| /** |
| * @author G. Todd Miller |
| */ |
| public class DOM2SAX implements XMLReader, Locator { |
| |
| private final static String EMPTYSTRING = ""; |
| private static final String XMLNS_PREFIX = "xmlns"; |
| |
| private Node _dom = null; |
| private ContentHandler _sax = null; |
| private LexicalHandler _lex = null; |
| private SAXImpl _saxImpl = null; |
| private Hashtable _nsPrefixes = new Hashtable(); |
| |
| public DOM2SAX(Node root) { |
| _dom = root; |
| } |
| |
| public ContentHandler getContentHandler() { |
| return _sax; |
| } |
| |
| public void setContentHandler(ContentHandler handler) throws |
| NullPointerException |
| { |
| _sax = handler; |
| if (handler instanceof LexicalHandler) { |
| _lex = (LexicalHandler) handler; |
| } |
| |
| if (handler instanceof SAXImpl) { |
| _saxImpl = (SAXImpl)handler; |
| } |
| } |
| |
| /** |
| * Begin the scope of namespace prefix. Forward the event to the |
| * SAX handler only if the prefix is unknown or it is mapped to a |
| * different URI. |
| */ |
| private boolean startPrefixMapping(String prefix, String uri) |
| throws SAXException |
| { |
| boolean pushed = true; |
| Stack uriStack = (Stack) _nsPrefixes.get(prefix); |
| |
| if (uriStack != null) { |
| if (uriStack.isEmpty()) { |
| _sax.startPrefixMapping(prefix, uri); |
| uriStack.push(uri); |
| } |
| else { |
| final String lastUri = (String) uriStack.peek(); |
| if (!lastUri.equals(uri)) { |
| _sax.startPrefixMapping(prefix, uri); |
| uriStack.push(uri); |
| } |
| else { |
| pushed = false; |
| } |
| } |
| } |
| else { |
| _sax.startPrefixMapping(prefix, uri); |
| _nsPrefixes.put(prefix, uriStack = new Stack()); |
| uriStack.push(uri); |
| } |
| return pushed; |
| } |
| |
| /* |
| * End the scope of a name prefix by popping it from the stack and |
| * passing the event to the SAX Handler. |
| */ |
| private void endPrefixMapping(String prefix) |
| throws SAXException |
| { |
| final Stack uriStack = (Stack) _nsPrefixes.get(prefix); |
| |
| if (uriStack != null) { |
| _sax.endPrefixMapping(prefix); |
| uriStack.pop(); |
| } |
| } |
| |
| /** |
| * If the DOM was created using a DOM 1.0 API, the local name may be |
| * null. If so, get the local name from the qualified name before |
| * generating the SAX event. |
| */ |
| private static String getLocalName(Node node) { |
| final String localName = node.getLocalName(); |
| |
| if (localName == null) { |
| final String qname = node.getNodeName(); |
| final int col = qname.lastIndexOf(':'); |
| return (col > 0) ? qname.substring(col + 1) : qname; |
| } |
| return localName; |
| } |
| |
| public void parse(InputSource unused) throws IOException, SAXException { |
| parse(_dom); |
| } |
| |
| public void parse() throws IOException, SAXException { |
| if (_dom != null) { |
| boolean isIncomplete = |
| (_dom.getNodeType() != org.w3c.dom.Node.DOCUMENT_NODE); |
| |
| if (isIncomplete) { |
| _sax.startDocument(); |
| parse(_dom); |
| _sax.endDocument(); |
| } |
| else { |
| parse(_dom); |
| } |
| } |
| } |
| |
| /** |
| * Traverse the DOM and generate SAX events for a handler. A |
| * startElement() event passes all attributes, including namespace |
| * declarations. |
| */ |
| private void parse(Node node) throws IOException, SAXException { |
| Node first = null; |
| if (node == null) return; |
| |
| switch (node.getNodeType()) { |
| case Node.ATTRIBUTE_NODE: // handled by ELEMENT_NODE |
| case Node.DOCUMENT_FRAGMENT_NODE: |
| case Node.DOCUMENT_TYPE_NODE : |
| case Node.ENTITY_NODE : |
| case Node.ENTITY_REFERENCE_NODE: |
| case Node.NOTATION_NODE : |
| // These node types are ignored!!! |
| break; |
| case Node.CDATA_SECTION_NODE: |
| final String cdata = node.getNodeValue(); |
| if (_lex != null) { |
| _lex.startCDATA(); |
| _sax.characters(cdata.toCharArray(), 0, cdata.length()); |
| _lex.endCDATA(); |
| } |
| else { |
| // in the case where there is no lex handler, we still |
| // want the text of the cdate to make its way through. |
| _sax.characters(cdata.toCharArray(), 0, cdata.length()); |
| } |
| break; |
| |
| case Node.COMMENT_NODE: // should be handled!!! |
| if (_lex != null) { |
| final String value = node.getNodeValue(); |
| _lex.comment(value.toCharArray(), 0, value.length()); |
| } |
| break; |
| case Node.DOCUMENT_NODE: |
| _sax.setDocumentLocator(this); |
| |
| _sax.startDocument(); |
| Node next = node.getFirstChild(); |
| while (next != null) { |
| parse(next); |
| next = next.getNextSibling(); |
| } |
| _sax.endDocument(); |
| break; |
| |
| case Node.ELEMENT_NODE: |
| String prefix; |
| List pushedPrefixes = new ArrayList(); |
| final AttributesImpl attrs = new AttributesImpl(); |
| final NamedNodeMap map = node.getAttributes(); |
| final int length = map.getLength(); |
| |
| // Process all namespace declarations |
| for (int i = 0; i < length; i++) { |
| final Node attr = map.item(i); |
| final String qnameAttr = attr.getNodeName(); |
| |
| // Ignore everything but NS declarations here |
| if (qnameAttr.startsWith(XMLNS_PREFIX)) { |
| final String uriAttr = attr.getNodeValue(); |
| final int colon = qnameAttr.lastIndexOf(':'); |
| prefix = (colon > 0) ? qnameAttr.substring(colon + 1) : EMPTYSTRING; |
| if (startPrefixMapping(prefix, uriAttr)) { |
| pushedPrefixes.add(prefix); |
| } |
| } |
| } |
| |
| // Process all other attributes |
| for (int i = 0; i < length; i++) { |
| final Node attr = map.item(i); |
| final String qnameAttr = attr.getNodeName(); |
| |
| // Ignore NS declarations here |
| if (!qnameAttr.startsWith(XMLNS_PREFIX)) { |
| final String uriAttr = attr.getNamespaceURI(); |
| final String localNameAttr = getLocalName(attr); |
| |
| // Uri may be implicitly declared |
| if (uriAttr != null) { |
| final int colon = qnameAttr.lastIndexOf(':'); |
| prefix = (colon > 0) ? qnameAttr.substring(0, colon) : EMPTYSTRING; |
| if (startPrefixMapping(prefix, uriAttr)) { |
| pushedPrefixes.add(prefix); |
| } |
| } |
| |
| // Add attribute to list |
| attrs.addAttribute(attr.getNamespaceURI(), getLocalName(attr), |
| qnameAttr, "CDATA", attr.getNodeValue()); |
| } |
| } |
| |
| // Now process the element itself |
| final String qname = node.getNodeName(); |
| final String uri = node.getNamespaceURI(); |
| final String localName = getLocalName(node); |
| |
| // Uri may be implicitly declared |
| if (uri != null) { |
| final int colon = qname.lastIndexOf(':'); |
| prefix = (colon > 0) ? qname.substring(0, colon) : EMPTYSTRING; |
| if (startPrefixMapping(prefix, uri)) { |
| pushedPrefixes.add(prefix); |
| } |
| } |
| |
| // Generate SAX event to start element |
| if (_saxImpl != null) { |
| _saxImpl.startElement(uri, localName, qname, attrs, node); |
| } |
| else { |
| _sax.startElement(uri, localName, qname, attrs); |
| } |
| |
| // Traverse all child nodes of the element (if any) |
| next = node.getFirstChild(); |
| while (next != null) { |
| parse(next); |
| next = next.getNextSibling(); |
| } |
| |
| // Generate SAX event to close element |
| _sax.endElement(uri, localName, qname); |
| |
| // Generate endPrefixMapping() for all pushed prefixes |
| final int nPushedPrefixes = pushedPrefixes.size(); |
| for (int i = 0; i < nPushedPrefixes; i++) { |
| endPrefixMapping((String) pushedPrefixes.get(i)); |
| } |
| break; |
| |
| case Node.PROCESSING_INSTRUCTION_NODE: |
| _sax.processingInstruction(node.getNodeName(), |
| node.getNodeValue()); |
| break; |
| |
| case Node.TEXT_NODE: |
| final String data = node.getNodeValue(); |
| _sax.characters(data.toCharArray(), 0, data.length()); |
| break; |
| } |
| } |
| |
| /** |
| * This class is only used internally so this method should never |
| * be called. |
| */ |
| public DTDHandler getDTDHandler() { |
| return null; |
| } |
| |
| /** |
| * This class is only used internally so this method should never |
| * be called. |
| */ |
| public ErrorHandler getErrorHandler() { |
| return null; |
| } |
| |
| /** |
| * This class is only used internally so this method should never |
| * be called. |
| */ |
| public boolean getFeature(String name) throws SAXNotRecognizedException, |
| SAXNotSupportedException |
| { |
| return false; |
| } |
| |
| /** |
| * This class is only used internally so this method should never |
| * be called. |
| */ |
| public void setFeature(String name, boolean value) throws |
| SAXNotRecognizedException, SAXNotSupportedException |
| { |
| } |
| |
| /** |
| * This class is only used internally so this method should never |
| * be called. |
| */ |
| public void parse(String sysId) throws IOException, SAXException { |
| throw new IOException("This method is not yet implemented."); |
| } |
| |
| /** |
| * This class is only used internally so this method should never |
| * be called. |
| */ |
| public void setDTDHandler(DTDHandler handler) throws NullPointerException { |
| } |
| |
| /** |
| * This class is only used internally so this method should never |
| * be called. |
| */ |
| public void setEntityResolver(EntityResolver resolver) throws |
| NullPointerException |
| { |
| } |
| |
| /** |
| * This class is only used internally so this method should never |
| * be called. |
| */ |
| public EntityResolver getEntityResolver() { |
| return null; |
| } |
| |
| /** |
| * This class is only used internally so this method should never |
| * be called. |
| */ |
| public void setErrorHandler(ErrorHandler handler) throws |
| NullPointerException |
| { |
| } |
| |
| /** |
| * This class is only used internally so this method should never |
| * be called. |
| */ |
| public void setProperty(String name, Object value) throws |
| SAXNotRecognizedException, SAXNotSupportedException { |
| } |
| |
| /** |
| * This class is only used internally so this method should never |
| * be called. |
| */ |
| public Object getProperty(String name) throws SAXNotRecognizedException, |
| SAXNotSupportedException |
| { |
| return null; |
| } |
| |
| /** |
| * This class is only used internally so this method should never |
| * be called. |
| */ |
| public int getColumnNumber() { |
| return 0; |
| } |
| |
| /** |
| * This class is only used internally so this method should never |
| * be called. |
| */ |
| public int getLineNumber() { |
| return 0; |
| } |
| |
| /** |
| * This class is only used internally so this method should never |
| * be called. |
| */ |
| public String getPublicId() { |
| return null; |
| } |
| |
| /** |
| * This class is only used internally so this method should never |
| * be called. |
| */ |
| public String getSystemId() { |
| return null; |
| } |
| |
| // Debugging |
| private String getNodeTypeFromCode(short code) { |
| String retval = null; |
| switch (code) { |
| case Node.ATTRIBUTE_NODE : |
| retval = "ATTRIBUTE_NODE"; break; |
| case Node.CDATA_SECTION_NODE : |
| retval = "CDATA_SECTION_NODE"; break; |
| case Node.COMMENT_NODE : |
| retval = "COMMENT_NODE"; break; |
| case Node.DOCUMENT_FRAGMENT_NODE : |
| retval = "DOCUMENT_FRAGMENT_NODE"; break; |
| case Node.DOCUMENT_NODE : |
| retval = "DOCUMENT_NODE"; break; |
| case Node.DOCUMENT_TYPE_NODE : |
| retval = "DOCUMENT_TYPE_NODE"; break; |
| case Node.ELEMENT_NODE : |
| retval = "ELEMENT_NODE"; break; |
| case Node.ENTITY_NODE : |
| retval = "ENTITY_NODE"; break; |
| case Node.ENTITY_REFERENCE_NODE : |
| retval = "ENTITY_REFERENCE_NODE"; break; |
| case Node.NOTATION_NODE : |
| retval = "NOTATION_NODE"; break; |
| case Node.PROCESSING_INSTRUCTION_NODE : |
| retval = "PROCESSING_INSTRUCTION_NODE"; break; |
| case Node.TEXT_NODE: |
| retval = "TEXT_NODE"; break; |
| } |
| return retval; |
| } |
| } |