1 /* 2 * reserved comment block 3 * DO NOT REMOVE OR ALTER! 4 */ 5 /* 6 * Copyright 2001, 2002,2004 The Apache Software Foundation. 7 * 8 * Licensed under the Apache License, Version 2.0 (the "License"); 9 * you may not use this file except in compliance with the License. 10 * You may obtain a copy of the License at 11 * 12 * http://www.apache.org/licenses/LICENSE-2.0 13 * 14 * Unless required by applicable law or agreed to in writing, software 15 * distributed under the License is distributed on an "AS IS" BASIS, 16 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 17 * See the License for the specific language governing permissions and 18 * limitations under the License. 19 */ 20 21 package com.sun.org.apache.xerces.internal.util; 22 23 import java.io.InputStream; 24 import java.io.IOException; 25 import java.io.Reader; 26 27 import com.sun.org.apache.xerces.internal.xni.XNIException; 28 import com.sun.org.apache.xerces.internal.xni.XMLResourceIdentifier; 29 import com.sun.org.apache.xerces.internal.xni.parser.XMLEntityResolver; 30 import com.sun.org.apache.xerces.internal.xni.parser.XMLInputSource; 31 32 import org.xml.sax.EntityResolver; 33 import org.xml.sax.InputSource; 34 import org.xml.sax.SAXException; 35 36 /** 37 * This class wraps a SAX entity resolver in an XNI entity resolver. 38 * 39 * @see EntityResolver 40 * 41 * @author Andy Clark, IBM 42 * 43 */ 44 public class EntityResolverWrapper 45 implements XMLEntityResolver { 46 47 // 48 // Data 49 // 50 51 /** The SAX entity resolver. */ 52 protected EntityResolver fEntityResolver; 53 54 // 55 // Constructors 56 // 57 58 /** Default constructor. */ 59 public EntityResolverWrapper() {} 60 61 /** Wraps the specified SAX entity resolver. */ 62 public EntityResolverWrapper(EntityResolver entityResolver) { 63 setEntityResolver(entityResolver); 64 } // <init>(EntityResolver) 65 66 // 67 // Public methods 68 // 69 70 /** Sets the SAX entity resolver. */ 71 public void setEntityResolver(EntityResolver entityResolver) { 72 fEntityResolver = entityResolver; 73 } // setEntityResolver(EntityResolver) 74 75 /** Returns the SAX entity resolver. */ 76 public EntityResolver getEntityResolver() { 77 return fEntityResolver; 78 } // getEntityResolver():EntityResolver 79 80 // 81 // XMLEntityResolver methods 82 // 83 84 /** 85 * Resolves an external parsed entity. If the entity cannot be 86 * resolved, this method should return null. 87 * 88 * @param resourceIdentifier contains the physical co-ordinates of the resource to be resolved 89 * 90 * @throws XNIException Thrown on general error. 91 * @throws IOException Thrown if resolved entity stream cannot be 92 * opened or some other i/o error occurs. 93 */ 94 public XMLInputSource resolveEntity(XMLResourceIdentifier resourceIdentifier) 95 throws XNIException, IOException { 96 97 // When both pubId and sysId are null, the user's entity resolver 98 // can do nothing about it. We'd better not bother calling it. 99 // This happens when the resourceIdentifier is a GrammarDescription, 100 // which describes a schema grammar of some namespace, but without 101 // any schema location hint. -Sg 102 String pubId = resourceIdentifier.getPublicId(); 103 String sysId = resourceIdentifier.getExpandedSystemId(); 104 if (pubId == null && sysId == null) 105 return null; 106 107 // resolve entity using SAX entity resolver 108 if (fEntityResolver != null && resourceIdentifier != null) { 109 try { 110 InputSource inputSource = fEntityResolver.resolveEntity(pubId, sysId); 111 if (inputSource != null) { 112 String publicId = inputSource.getPublicId(); 113 String systemId = inputSource.getSystemId(); 114 String baseSystemId = resourceIdentifier.getBaseSystemId(); 115 InputStream byteStream = inputSource.getByteStream(); 116 Reader charStream = inputSource.getCharacterStream(); 117 String encoding = inputSource.getEncoding(); 118 XMLInputSource xmlInputSource = 119 new XMLInputSource(publicId, systemId, baseSystemId, true); 120 xmlInputSource.setByteStream(byteStream); 121 xmlInputSource.setCharacterStream(charStream); 122 xmlInputSource.setEncoding(encoding); 123 return xmlInputSource; 124 } 125 } 126 127 // error resolving entity 128 catch (SAXException e) { 129 Exception ex = e.getException(); 130 if (ex == null) { 131 ex = e; 132 } 133 throw new XNIException(ex); 134 } 135 } 136 137 // unable to resolve entity 138 return null; 139 140 } // resolveEntity(String,String,String):XMLInputSource 141 }