1 /*
   2  * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package com.sun.xml.internal.xsom.util;
  27 
  28 import com.sun.xml.internal.xsom.XSAnnotation;
  29 import com.sun.xml.internal.xsom.parser.AnnotationContext;
  30 import com.sun.xml.internal.xsom.parser.AnnotationParser;
  31 import com.sun.xml.internal.xsom.parser.AnnotationParserFactory;
  32 import javax.xml.XMLConstants;
  33 import org.w3c.dom.Document;
  34 import org.w3c.dom.Element;
  35 import org.w3c.dom.Node;
  36 import org.xml.sax.ContentHandler;
  37 import org.xml.sax.EntityResolver;
  38 import org.xml.sax.ErrorHandler;
  39 
  40 import javax.xml.transform.TransformerConfigurationException;
  41 import javax.xml.transform.dom.DOMResult;
  42 import javax.xml.transform.sax.SAXTransformerFactory;
  43 import javax.xml.transform.sax.TransformerHandler;
  44 
  45 /**
  46  * {@link AnnotationParserFactory} that parses annotations into a W3C DOM.
  47  *
  48  * <p>
  49  * If you use this parser factory, you'll get {@link Element} that represents
  50  * &lt;xs:annotation> from {@link XSAnnotation#getAnnotation()}.
  51  *
  52  * <p>
  53  * When multiple &lt;xs:annotation>s are found for the given schema component,
  54  * you'll see all &lt;xs:appinfo>s and &lt;xs:documentation>s combined under
  55  * one &lt;xs:annotation> element.
  56  *
  57  * @author Kohsuke Kawaguchi
  58  */
  59 public class DomAnnotationParserFactory implements AnnotationParserFactory {
  60 
  61     public AnnotationParser create() {
  62         return new AnnotationParserImpl();
  63     }
  64 
  65     public AnnotationParser create(boolean disableSecureProcessing) {
  66         return new AnnotationParserImpl(disableSecureProcessing);
  67     }
  68 
  69     private static final ContextClassloaderLocal<SAXTransformerFactory> stf = new ContextClassloaderLocal<SAXTransformerFactory>() {
  70         @Override
  71         protected SAXTransformerFactory initialValue() throws Exception {
  72             return (SAXTransformerFactory) SAXTransformerFactory.newInstance();
  73         }
  74     };
  75 
  76     private static class AnnotationParserImpl extends AnnotationParser {
  77 
  78         /**
  79          * Identity transformer used to parse SAX into DOM.
  80          */
  81         private final TransformerHandler transformer;
  82         private DOMResult result;
  83 
  84         AnnotationParserImpl() {
  85             this(false);
  86         }
  87 
  88         AnnotationParserImpl(boolean disableSecureProcessing) {
  89             try {
  90                 SAXTransformerFactory factory = stf.get();
  91                 factory.setFeature(XMLConstants.FEATURE_SECURE_PROCESSING, disableSecureProcessing);
  92                 transformer = factory.newTransformerHandler();
  93             } catch (TransformerConfigurationException e) {
  94                 throw new Error(e); // impossible
  95             }
  96         }
  97 
  98         public ContentHandler getContentHandler(AnnotationContext context, String parentElementName, ErrorHandler errorHandler, EntityResolver entityResolver) {
  99             result = new DOMResult();
 100             transformer.setResult(result);
 101             return transformer;
 102         }
 103 
 104         public Object getResult(Object existing) {
 105             Document dom = (Document)result.getNode();
 106             Element e = dom.getDocumentElement();
 107             if(existing instanceof Element) {
 108                 // merge all the children
 109                 Element prev = (Element) existing;
 110                 Node anchor = e.getFirstChild();
 111                 while(prev.getFirstChild()!=null) {
 112                     Node move = prev.getFirstChild();
 113                     e.insertBefore(e.getOwnerDocument().adoptNode(move), anchor );
 114                 }
 115             }
 116             return e;
 117         }
 118     }
 119 }