| /* |
| * 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.xml.utils; |
| |
| import java.util.StringTokenizer; |
| import java.util.Vector; |
| |
| import javax.xml.transform.Source; |
| import javax.xml.transform.TransformerException; |
| import javax.xml.transform.URIResolver; |
| import javax.xml.transform.sax.SAXSource; |
| |
| import org.apache.xml.utils.SystemIDResolver; |
| |
| import org.xml.sax.Attributes; |
| import org.xml.sax.InputSource; |
| import org.xml.sax.helpers.DefaultHandler; |
| |
| /** |
| * Search for the xml-stylesheet processing instructions in an XML document. |
| * @see <a href="http://www.w3.org/TR/xml-stylesheet/">Associating Style Sheets with XML documents, Version 1.0</a> |
| */ |
| public class StylesheetPIHandler extends DefaultHandler |
| { |
| /** The baseID of the document being processed. */ |
| String m_baseID; |
| |
| /** The desired media criteria. */ |
| String m_media; |
| |
| /** The desired title criteria. */ |
| String m_title; |
| |
| /** The desired character set criteria. */ |
| String m_charset; |
| |
| /** A list of SAXSource objects that match the criteria. */ |
| Vector m_stylesheets = new Vector(); |
| |
| // Add code to use a URIResolver. Patch from Dmitri Ilyin. |
| |
| /** |
| * The object that implements the URIResolver interface, |
| * or null. |
| */ |
| URIResolver m_uriResolver; |
| |
| /** |
| * Get the object that will be used to resolve URIs in href |
| * in xml-stylesheet processing instruction. |
| * |
| * @param resolver An object that implements the URIResolver interface, |
| * or null. |
| */ |
| public void setURIResolver(URIResolver resolver) |
| { |
| m_uriResolver = resolver; |
| } |
| |
| /** |
| * Get the object that will be used to resolve URIs in href |
| * in xml-stylesheet processing instruction. |
| * |
| * @return The URIResolver that was set with setURIResolver. |
| */ |
| public URIResolver getURIResolver() |
| { |
| return m_uriResolver; |
| } |
| |
| /** |
| * Construct a StylesheetPIHandler instance that will search |
| * for xml-stylesheet PIs based on the given criteria. |
| * |
| * @param baseID The base ID of the XML document, needed to resolve |
| * relative IDs. |
| * @param media The desired media criteria. |
| * @param title The desired title criteria. |
| * @param charset The desired character set criteria. |
| */ |
| public StylesheetPIHandler(String baseID, String media, String title, |
| String charset) |
| { |
| |
| m_baseID = baseID; |
| m_media = media; |
| m_title = title; |
| m_charset = charset; |
| } |
| |
| /** |
| * Return the last stylesheet found that match the constraints. |
| * |
| * @return Source object that references the last stylesheet reference |
| * that matches the constraints. |
| */ |
| public Source getAssociatedStylesheet() |
| { |
| |
| int sz = m_stylesheets.size(); |
| |
| if (sz > 0) |
| { |
| Source source = (Source) m_stylesheets.elementAt(sz-1); |
| return source; |
| } |
| else |
| return null; |
| } |
| |
| /** |
| * Handle the xml-stylesheet processing instruction. |
| * |
| * @param target The processing instruction target. |
| * @param data The processing instruction data, or null if |
| * none is supplied. |
| * @throws org.xml.sax.SAXException Any SAX exception, possibly |
| * wrapping another exception. |
| * @see org.xml.sax.ContentHandler#processingInstruction |
| * @see <a href="http://www.w3.org/TR/xml-stylesheet/">Associating Style Sheets with XML documents, Version 1.0</a> |
| */ |
| public void processingInstruction(String target, String data) |
| throws org.xml.sax.SAXException |
| { |
| |
| if (target.equals("xml-stylesheet")) |
| { |
| String href = null; // CDATA #REQUIRED |
| String type = null; // CDATA #REQUIRED |
| String title = null; // CDATA #IMPLIED |
| String media = null; // CDATA #IMPLIED |
| String charset = null; // CDATA #IMPLIED |
| boolean alternate = false; // (yes|no) "no" |
| StringTokenizer tokenizer = new StringTokenizer(data, " \t=\n", true); |
| boolean lookedAhead = false; |
| Source source = null; |
| |
| String token = ""; |
| while (tokenizer.hasMoreTokens()) |
| { |
| if (!lookedAhead) |
| token = tokenizer.nextToken(); |
| else |
| lookedAhead = false; |
| if (tokenizer.hasMoreTokens() && |
| (token.equals(" ") || token.equals("\t") || token.equals("="))) |
| continue; |
| |
| String name = token; |
| if (name.equals("type")) |
| { |
| token = tokenizer.nextToken(); |
| while (tokenizer.hasMoreTokens() && |
| (token.equals(" " ) || token.equals("\t") || token.equals("="))) |
| token = tokenizer.nextToken(); |
| type = token.substring(1, token.length() - 1); |
| |
| } |
| else if (name.equals("href")) |
| { |
| token = tokenizer.nextToken(); |
| while (tokenizer.hasMoreTokens() && |
| (token.equals(" " ) || token.equals("\t") || token.equals("="))) |
| token = tokenizer.nextToken(); |
| href = token; |
| if (tokenizer.hasMoreTokens()) |
| { |
| token = tokenizer.nextToken(); |
| // If the href value has parameters to be passed to a |
| // servlet(something like "foobar?id=12..."), |
| // we want to make sure we get them added to |
| // the href value. Without this check, we would move on |
| // to try to process another attribute and that would be |
| // wrong. |
| // We need to set lookedAhead here to flag that we |
| // already have the next token. |
| while ( token.equals("=") && tokenizer.hasMoreTokens()) |
| { |
| href = href + token + tokenizer.nextToken(); |
| if (tokenizer.hasMoreTokens()) |
| { |
| token = tokenizer.nextToken(); |
| lookedAhead = true; |
| } |
| else |
| { |
| break; |
| } |
| } |
| } |
| href = href.substring(1, href.length() - 1); |
| try |
| { |
| // Add code to use a URIResolver. Patch from Dmitri Ilyin. |
| if (m_uriResolver != null) |
| { |
| source = m_uriResolver.resolve(href, m_baseID); |
| } |
| else |
| { |
| href = SystemIDResolver.getAbsoluteURI(href, m_baseID); |
| source = new SAXSource(new InputSource(href)); |
| } |
| } |
| catch(TransformerException te) |
| { |
| throw new org.xml.sax.SAXException(te); |
| } |
| } |
| else if (name.equals("title")) |
| { |
| token = tokenizer.nextToken(); |
| while (tokenizer.hasMoreTokens() && |
| (token.equals(" " ) || token.equals("\t") || token.equals("="))) |
| token = tokenizer.nextToken(); |
| title = token.substring(1, token.length() - 1); |
| } |
| else if (name.equals("media")) |
| { |
| token = tokenizer.nextToken(); |
| while (tokenizer.hasMoreTokens() && |
| (token.equals(" " ) || token.equals("\t") || token.equals("="))) |
| token = tokenizer.nextToken(); |
| media = token.substring(1, token.length() - 1); |
| } |
| else if (name.equals("charset")) |
| { |
| token = tokenizer.nextToken(); |
| while (tokenizer.hasMoreTokens() && |
| (token.equals(" " ) || token.equals("\t") || token.equals("="))) |
| token = tokenizer.nextToken(); |
| charset = token.substring(1, token.length() - 1); |
| } |
| else if (name.equals("alternate")) |
| { |
| token = tokenizer.nextToken(); |
| while (tokenizer.hasMoreTokens() && |
| (token.equals(" " ) || token.equals("\t") || token.equals("="))) |
| token = tokenizer.nextToken(); |
| alternate = token.substring(1, token.length() |
| - 1).equals("yes"); |
| } |
| |
| } |
| |
| if ((null != type) |
| && (type.equals("text/xsl") || type.equals("text/xml") || type.equals("application/xml+xslt")) |
| && (null != href)) |
| { |
| if (null != m_media) |
| { |
| if (null != media) |
| { |
| if (!media.equals(m_media)) |
| return; |
| } |
| else |
| return; |
| } |
| |
| if (null != m_charset) |
| { |
| if (null != charset) |
| { |
| if (!charset.equals(m_charset)) |
| return; |
| } |
| else |
| return; |
| } |
| |
| if (null != m_title) |
| { |
| if (null != title) |
| { |
| if (!title.equals(m_title)) |
| return; |
| } |
| else |
| return; |
| } |
| |
| m_stylesheets.addElement(source); |
| } |
| } |
| } |
| |
| |
| /** |
| * The spec notes that "The xml-stylesheet processing instruction is allowed only in the prolog of an XML document.", |
| * so, at least for right now, I'm going to go ahead an throw a TransformerException |
| * in order to stop the parse. |
| * |
| * @param namespaceURI The Namespace URI, or an empty string. |
| * @param localName The local name (without prefix), or empty string if not namespace processing. |
| * @param qName The qualified name (with prefix). |
| * @param atts The specified or defaulted attributes. |
| * |
| * @throws StopParseException since there can be no valid xml-stylesheet processing |
| * instructions past the first element. |
| */ |
| public void startElement( |
| String namespaceURI, String localName, String qName, Attributes atts) |
| throws org.xml.sax.SAXException |
| { |
| throw new StopParseException(); |
| } |
| |
| /** |
| * Added additional getter and setter methods for the Base Id |
| * to fix bugzilla bug 24187 |
| * |
| */ |
| public void setBaseId(String baseId) { |
| m_baseID = baseId; |
| |
| } |
| public String getBaseId() { |
| return m_baseID ; |
| } |
| |
| } |