1 /*
   2  * Copyright (c) 1997, 2012, 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.bind.v2.runtime.unmarshaller;
  27 
  28 import javax.xml.namespace.NamespaceContext;
  29 
  30 import org.xml.sax.Attributes;
  31 import org.xml.sax.SAXException;
  32 
  33 /**
  34  * {@link XmlVisitor} decorator that interns all string tokens.
  35  *
  36  * @author Kohsuke Kawaguchi
  37  */
  38 public final class InterningXmlVisitor implements XmlVisitor {
  39     private final XmlVisitor next;
  40 
  41     private final AttributesImpl attributes = new AttributesImpl();
  42 
  43     public InterningXmlVisitor(XmlVisitor next) {
  44         this.next = next;
  45     }
  46 
  47     public void startDocument(LocatorEx locator, NamespaceContext nsContext) throws SAXException {
  48         next.startDocument(locator,nsContext);
  49     }
  50 
  51     public void endDocument() throws SAXException {
  52         next.endDocument();
  53     }
  54 
  55     public void startElement(TagName tagName ) throws SAXException {
  56         attributes.setAttributes(tagName.atts);
  57         tagName.atts = attributes;
  58         tagName.uri = intern(tagName.uri);
  59         tagName.local = intern(tagName.local);
  60         next.startElement(tagName);
  61     }
  62 
  63     public void endElement(TagName tagName ) throws SAXException {
  64         tagName.uri = intern(tagName.uri);
  65         tagName.local = intern(tagName.local);
  66         next.endElement(tagName);
  67     }
  68 
  69     public void startPrefixMapping( String prefix, String nsUri ) throws SAXException {
  70         next.startPrefixMapping(intern(prefix),intern(nsUri));
  71     }
  72 
  73     public void endPrefixMapping( String prefix ) throws SAXException {
  74         next.endPrefixMapping(intern(prefix));
  75     }
  76 
  77     public void text( CharSequence pcdata ) throws SAXException {
  78         next.text(pcdata);
  79     }
  80 
  81     public UnmarshallingContext getContext() {
  82         return next.getContext();
  83     }
  84 
  85     public TextPredictor getPredictor() {
  86         return next.getPredictor();
  87     }
  88 
  89     private static class AttributesImpl implements Attributes {
  90         private Attributes core;
  91 
  92         void setAttributes(Attributes att) {
  93             this.core = att;
  94         }
  95 
  96         public int getIndex(String qName) {
  97             return core.getIndex(qName);
  98         }
  99 
 100         public int getIndex(String uri, String localName) {
 101             return core.getIndex(uri, localName);
 102         }
 103 
 104         public int getLength() {
 105             return core.getLength();
 106         }
 107 
 108         public String getLocalName(int index) {
 109             return intern(core.getLocalName(index));
 110         }
 111 
 112         public String getQName(int index) {
 113             return intern(core.getQName(index));
 114         }
 115 
 116         public String getType(int index) {
 117             return intern(core.getType(index));
 118         }
 119 
 120         public String getType(String qName) {
 121             return intern(core.getType(qName));
 122         }
 123 
 124         public String getType(String uri, String localName) {
 125             return intern(core.getType(uri, localName));
 126         }
 127 
 128         public String getURI(int index) {
 129             return intern(core.getURI(index));
 130         }
 131 
 132         //
 133         // since values may vary a lot,
 134         // we don't (probably shouldn't) intern values.
 135         //
 136 
 137         public String getValue(int index) {
 138             return core.getValue(index);
 139         }
 140 
 141         public String getValue(String qName) {
 142             return core.getValue(qName);
 143         }
 144 
 145         public String getValue(String uri, String localName) {
 146             return core.getValue(uri, localName);
 147         }
 148     }
 149 
 150     private static String intern(String s) {
 151         if(s==null)     return null;
 152         else            return s.intern();
 153     }
 154 }