1320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson/* 2320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson * Licensed to the Apache Software Foundation (ASF) under one or more 3320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson * contributor license agreements. See the NOTICE file distributed with 4320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson * this work for additional information regarding copyright ownership. 5320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson * The ASF licenses this file to You under the Apache License, Version 2.0 6320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson * (the "License"); you may not use this file except in compliance with 7320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson * the License. You may obtain a copy of the License at 8320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson * 9320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson * http://www.apache.org/licenses/LICENSE-2.0 10320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson * 11320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson * Unless required by applicable law or agreed to in writing, software 12320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson * distributed under the License is distributed on an "AS IS" BASIS, 13320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson * See the License for the specific language governing permissions and 15320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson * limitations under the License. 16320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson */ 17320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson// $Id: XPathFactoryFinder.java 670432 2008-06-23 02:02:08Z mrglavas $ 18320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson 19320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilsonpackage javax.xml.xpath; 20320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson 21320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilsonimport java.io.BufferedReader; 22320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilsonimport java.io.File; 23670c354edf01dcda0d9c4363a0996923bb30169bJesse Wilsonimport java.io.FileInputStream; 24320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilsonimport java.io.IOException; 25320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilsonimport java.io.InputStream; 26320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilsonimport java.io.InputStreamReader; 27320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilsonimport java.net.URL; 28670c354edf01dcda0d9c4363a0996923bb30169bJesse Wilsonimport java.util.Collections; 29320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilsonimport java.util.Enumeration; 30320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilsonimport java.util.Iterator; 31320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilsonimport java.util.Properties; 32320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilsonimport javax.xml.validation.SchemaFactory; 33a7a70410e26802f3ab480b08a1ab499338cb6f7eJesse Wilsonimport libcore.io.IoUtils; 34320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson 35320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson/** 36320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson * Implementation of {@link XPathFactory#newInstance(String)}. 37f33eae7e84eb6d3b0f4e86b59605bb3de73009f3Elliott Hughes * 38320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson * @author <a href="Kohsuke.Kawaguchi@Sun.com">Kohsuke Kawaguchi</a> 39320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson * @version $Revision: 670432 $, $Date: 2008-06-22 19:02:08 -0700 (Sun, 22 Jun 2008) $ 40320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson * @since 1.5 41320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson */ 42320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilsonfinal class XPathFactoryFinder { 43f33eae7e84eb6d3b0f4e86b59605bb3de73009f3Elliott Hughes 44320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson /** debug support code. */ 45320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson private static boolean debug = false; 46f33eae7e84eb6d3b0f4e86b59605bb3de73009f3Elliott Hughes 47320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson /** 48320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson * Default columns per line. 49320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson */ 50320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson private static final int DEFAULT_LINE_LENGTH = 80; 51f33eae7e84eb6d3b0f4e86b59605bb3de73009f3Elliott Hughes 52320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson static { 53670c354edf01dcda0d9c4363a0996923bb30169bJesse Wilson String val = System.getProperty("jaxp.debug"); 54670c354edf01dcda0d9c4363a0996923bb30169bJesse Wilson // Allow simply setting the prop to turn on debug 55670c354edf01dcda0d9c4363a0996923bb30169bJesse Wilson debug = val != null && (! "false".equals(val)); 56320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson } 57320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson 58320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson /** 59320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson * <p>Cache properties for performance.</p> 60320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson */ 61d21d78fd49a2d798218e8c8aefbddb26a0e71bbbElliott Hughes private static Properties cacheProps = new Properties(); 62f33eae7e84eb6d3b0f4e86b59605bb3de73009f3Elliott Hughes 63d21d78fd49a2d798218e8c8aefbddb26a0e71bbbElliott Hughes /** 64d21d78fd49a2d798218e8c8aefbddb26a0e71bbbElliott Hughes * <p>First time requires initialization overhead.</p> 65d21d78fd49a2d798218e8c8aefbddb26a0e71bbbElliott Hughes */ 66d21d78fd49a2d798218e8c8aefbddb26a0e71bbbElliott Hughes private static boolean firstTime = true; 67f33eae7e84eb6d3b0f4e86b59605bb3de73009f3Elliott Hughes 68320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson /** 69320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson * <p>Conditional debug printing.</p> 70f33eae7e84eb6d3b0f4e86b59605bb3de73009f3Elliott Hughes * 71320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson * @param msg to print 72320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson */ 73320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson private static void debugPrintln(String msg) { 74320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson if (debug) { 75320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson System.err.println("JAXP: " + msg); 76320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson } 77320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson } 78f33eae7e84eb6d3b0f4e86b59605bb3de73009f3Elliott Hughes 79320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson /** 80320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson * <p><code>ClassLoader</code> to use to find <code>SchemaFactory</code>.</p> 81320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson */ 82320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson private final ClassLoader classLoader; 83f33eae7e84eb6d3b0f4e86b59605bb3de73009f3Elliott Hughes 84320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson /** 85320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson * <p>Constructor that specifies <code>ClassLoader</code> to use 86320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson * to find <code>SchemaFactory</code>.</p> 87f33eae7e84eb6d3b0f4e86b59605bb3de73009f3Elliott Hughes * 88320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson * @param loader 89320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson * to be used to load resource, {@link SchemaFactory}, and 90670c354edf01dcda0d9c4363a0996923bb30169bJesse Wilson * {@code SchemaFactoryLoader} implementations during 91320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson * the resolution process. 92320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson * If this parameter is null, the default system class loader 93320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson * will be used. 94320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson */ 95320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson public XPathFactoryFinder(ClassLoader loader) { 96320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson this.classLoader = loader; 97670c354edf01dcda0d9c4363a0996923bb30169bJesse Wilson if (debug) { 98320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson debugDisplayClassLoader(); 99320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson } 100320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson } 101f33eae7e84eb6d3b0f4e86b59605bb3de73009f3Elliott Hughes 102320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson private void debugDisplayClassLoader() { 103670c354edf01dcda0d9c4363a0996923bb30169bJesse Wilson if (classLoader == Thread.currentThread().getContextClassLoader()) { 104670c354edf01dcda0d9c4363a0996923bb30169bJesse Wilson debugPrintln("using thread context class loader (" + classLoader + ") for search"); 105670c354edf01dcda0d9c4363a0996923bb30169bJesse Wilson return; 106320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson } 107f33eae7e84eb6d3b0f4e86b59605bb3de73009f3Elliott Hughes 108670c354edf01dcda0d9c4363a0996923bb30169bJesse Wilson if (classLoader==ClassLoader.getSystemClassLoader()) { 109670c354edf01dcda0d9c4363a0996923bb30169bJesse Wilson debugPrintln("using system class loader (" + classLoader + ") for search"); 110320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson return; 111320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson } 112320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson 113670c354edf01dcda0d9c4363a0996923bb30169bJesse Wilson debugPrintln("using class loader (" + classLoader + ") for search"); 114320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson } 115f33eae7e84eb6d3b0f4e86b59605bb3de73009f3Elliott Hughes 116320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson /** 117320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson * <p>Creates a new {@link XPathFactory} object for the specified 118320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson * schema language.</p> 119f33eae7e84eb6d3b0f4e86b59605bb3de73009f3Elliott Hughes * 120320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson * @param uri 121320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson * Identifies the underlying object model. 122f33eae7e84eb6d3b0f4e86b59605bb3de73009f3Elliott Hughes * 123320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson * @return <code>null</code> if the callee fails to create one. 124f33eae7e84eb6d3b0f4e86b59605bb3de73009f3Elliott Hughes * 125320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson * @throws NullPointerException 126320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson * If the parameter is null. 127320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson */ 128320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson public XPathFactory newFactory(String uri) { 12986acc043d3334651ee26c65467d78d6cefedd397Kenny Root if (uri == null) { 13086acc043d3334651ee26c65467d78d6cefedd397Kenny Root throw new NullPointerException("uri == null"); 13186acc043d3334651ee26c65467d78d6cefedd397Kenny Root } 132320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson XPathFactory f = _newFactory(uri); 133320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson if (debug) { 134320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson if (f != null) { 135320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson debugPrintln("factory '" + f.getClass().getName() + "' was found for " + uri); 136320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson } else { 137320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson debugPrintln("unable to find a factory for " + uri); 138320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson } 139320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson } 140320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson return f; 141320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson } 142f33eae7e84eb6d3b0f4e86b59605bb3de73009f3Elliott Hughes 143320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson /** 144320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson * <p>Lookup a {@link XPathFactory} for the given object model.</p> 145f33eae7e84eb6d3b0f4e86b59605bb3de73009f3Elliott Hughes * 146320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson * @param uri identifies the object model. 147320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson */ 148320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson private XPathFactory _newFactory(String uri) { 149320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson XPathFactory xpf; 150320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson String propertyName = SERVICE_CLASS.getName() + ":" + uri; 151f33eae7e84eb6d3b0f4e86b59605bb3de73009f3Elliott Hughes 152320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson // system property look up 153320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson try { 154320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson if (debug) debugPrintln("Looking up system property '"+propertyName+"'" ); 155670c354edf01dcda0d9c4363a0996923bb30169bJesse Wilson String r = System.getProperty(propertyName); 156320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson if (r != null && r.length() > 0) { 157320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson if (debug) debugPrintln("The value is '"+r+"'"); 158320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson xpf = createInstance(r); 159320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson if(xpf!=null) return xpf; 160670c354edf01dcda0d9c4363a0996923bb30169bJesse Wilson } else if (debug) { 161320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson debugPrintln("The property is undefined."); 162320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson } 163670c354edf01dcda0d9c4363a0996923bb30169bJesse Wilson } catch (Exception e) { 164670c354edf01dcda0d9c4363a0996923bb30169bJesse Wilson e.printStackTrace(); 165320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson } 166f33eae7e84eb6d3b0f4e86b59605bb3de73009f3Elliott Hughes 167670c354edf01dcda0d9c4363a0996923bb30169bJesse Wilson String javah = System.getProperty("java.home"); 168320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson String configFile = javah + File.separator + 169320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson "lib" + File.separator + "jaxp.properties"; 170320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson 171320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson String factoryClassName = null ; 172320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson 173320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson // try to read from $java.home/lib/jaxp.properties 174320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson try { 175320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson if(firstTime){ 176320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson synchronized(cacheProps){ 177320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson if(firstTime){ 178320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson File f=new File( configFile ); 179320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson firstTime = false; 180670c354edf01dcda0d9c4363a0996923bb30169bJesse Wilson if (f.exists()) { 181f33eae7e84eb6d3b0f4e86b59605bb3de73009f3Elliott Hughes if (debug) debugPrintln("Read properties file " + f); 182670c354edf01dcda0d9c4363a0996923bb30169bJesse Wilson cacheProps.load(new FileInputStream(f)); 183320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson } 184320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson } 185320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson } 186320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson } 187f33eae7e84eb6d3b0f4e86b59605bb3de73009f3Elliott Hughes factoryClassName = cacheProps.getProperty(propertyName); 188f33eae7e84eb6d3b0f4e86b59605bb3de73009f3Elliott Hughes if (debug) debugPrintln("found " + factoryClassName + " in $java.home/jaxp.properties"); 189320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson 190320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson if (factoryClassName != null) { 191320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson xpf = createInstance(factoryClassName); 192320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson if(xpf != null){ 193320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson return xpf; 194320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson } 195320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson } 196320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson } catch (Exception ex) { 197320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson if (debug) { 198320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson ex.printStackTrace(); 199f33eae7e84eb6d3b0f4e86b59605bb3de73009f3Elliott Hughes } 200320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson } 201f33eae7e84eb6d3b0f4e86b59605bb3de73009f3Elliott Hughes 202320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson // try META-INF/services files 203670c354edf01dcda0d9c4363a0996923bb30169bJesse Wilson for (URL resource : createServiceFileIterator()) { 204320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson if (debug) debugPrintln("looking into " + resource); 205320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson try { 206670c354edf01dcda0d9c4363a0996923bb30169bJesse Wilson xpf = loadFromServicesFile(uri, resource.toExternalForm(), resource.openStream()); 207320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson if(xpf!=null) return xpf; 208320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson } catch(IOException e) { 209320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson if( debug ) { 210320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson debugPrintln("failed to read "+resource); 211320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson e.printStackTrace(); 212320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson } 213320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson } 214320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson } 215f33eae7e84eb6d3b0f4e86b59605bb3de73009f3Elliott Hughes 216320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson // platform default 217320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson if(uri.equals(XPathFactory.DEFAULT_OBJECT_MODEL_URI)) { 218320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson if (debug) debugPrintln("attempting to use the platform default W3C DOM XPath lib"); 219320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson return createInstance("org.apache.xpath.jaxp.XPathFactoryImpl"); 220320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson } 221f33eae7e84eb6d3b0f4e86b59605bb3de73009f3Elliott Hughes 222320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson if (debug) debugPrintln("all things were tried, but none was found. bailing out."); 223320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson return null; 224320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson } 225f33eae7e84eb6d3b0f4e86b59605bb3de73009f3Elliott Hughes 226320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson /** 227320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson * <p>Creates an instance of the specified and returns it.</p> 228f33eae7e84eb6d3b0f4e86b59605bb3de73009f3Elliott Hughes * 229320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson * @param className 230670c354edf01dcda0d9c4363a0996923bb30169bJesse Wilson * fully qualified class name to be instantiated. 231f33eae7e84eb6d3b0f4e86b59605bb3de73009f3Elliott Hughes * 232320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson * @return null 233f33eae7e84eb6d3b0f4e86b59605bb3de73009f3Elliott Hughes * if it fails. Error messages will be printed by this method. 234320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson */ 235320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson XPathFactory createInstance( String className ) { 236320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson try { 237670c354edf01dcda0d9c4363a0996923bb30169bJesse Wilson if (debug) debugPrintln("instantiating "+className); 238320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson Class clazz; 239320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson if( classLoader!=null ) 240320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson clazz = classLoader.loadClass(className); 241320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson else 242320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson clazz = Class.forName(className); 243320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson if(debug) debugPrintln("loaded it from "+which(clazz)); 244320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson Object o = clazz.newInstance(); 245f33eae7e84eb6d3b0f4e86b59605bb3de73009f3Elliott Hughes 246320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson if( o instanceof XPathFactory ) 247320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson return (XPathFactory)o; 248f33eae7e84eb6d3b0f4e86b59605bb3de73009f3Elliott Hughes 249320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson if (debug) debugPrintln(className+" is not assignable to "+SERVICE_CLASS.getName()); 250320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson } 251320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson // The VM ran out of memory or there was some other serious problem. Re-throw. 252320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson catch (VirtualMachineError vme) { 253320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson throw vme; 254320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson } 255320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson // ThreadDeath should always be re-thrown 256320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson catch (ThreadDeath td) { 257320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson throw td; 258320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson } 259320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson catch (Throwable t) { 260320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson if (debug) { 261670c354edf01dcda0d9c4363a0996923bb30169bJesse Wilson debugPrintln("failed to instantiate "+className); 262320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson t.printStackTrace(); 263320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson } 264320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson } 265320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson return null; 266320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson } 267f33eae7e84eb6d3b0f4e86b59605bb3de73009f3Elliott Hughes 268320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson /** Searches for a XPathFactory for a given uri in a META-INF/services file. */ 269320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson private XPathFactory loadFromServicesFile(String uri, String resourceName, InputStream in) { 270320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson 271320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson if (debug) debugPrintln("Reading " + resourceName ); 272f33eae7e84eb6d3b0f4e86b59605bb3de73009f3Elliott Hughes 273320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson BufferedReader rd; 274320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson try { 275320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson rd = new BufferedReader(new InputStreamReader(in, "UTF-8"), DEFAULT_LINE_LENGTH); 276320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson } catch (java.io.UnsupportedEncodingException e) { 277320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson rd = new BufferedReader(new InputStreamReader(in), DEFAULT_LINE_LENGTH); 278320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson } 279f33eae7e84eb6d3b0f4e86b59605bb3de73009f3Elliott Hughes 280670c354edf01dcda0d9c4363a0996923bb30169bJesse Wilson String factoryClassName; 281320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson XPathFactory resultFactory = null; 282320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson // See spec for provider-configuration files: http://java.sun.com/j2se/1.5.0/docs/guide/jar/jar.html#Provider%20Configuration%20File 283320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson while (true) { 284320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson try { 285f33eae7e84eb6d3b0f4e86b59605bb3de73009f3Elliott Hughes factoryClassName = rd.readLine(); 286320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson } catch (IOException x) { 287320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson // No provider found 288320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson break; 289320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson } 290320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson if (factoryClassName != null) { 291320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson // Ignore comments in the provider-configuration file 292320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson int hashIndex = factoryClassName.indexOf('#'); 293320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson if (hashIndex != -1) { 294320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson factoryClassName = factoryClassName.substring(0, hashIndex); 295320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson } 296f33eae7e84eb6d3b0f4e86b59605bb3de73009f3Elliott Hughes 297320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson // Ignore leading and trailing whitespace 298320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson factoryClassName = factoryClassName.trim(); 299f33eae7e84eb6d3b0f4e86b59605bb3de73009f3Elliott Hughes 300320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson // If there's no text left or if this was a blank line, go to the next one. 301320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson if (factoryClassName.length() == 0) { 302320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson continue; 303320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson } 304f33eae7e84eb6d3b0f4e86b59605bb3de73009f3Elliott Hughes 305320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson try { 306320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson // Found the right XPathFactory if its isObjectModelSupported(String uri) method returns true. 307670c354edf01dcda0d9c4363a0996923bb30169bJesse Wilson XPathFactory foundFactory = createInstance(factoryClassName); 308320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson if (foundFactory.isObjectModelSupported(uri)) { 309320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson resultFactory = foundFactory; 310320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson break; 311320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson } 312670c354edf01dcda0d9c4363a0996923bb30169bJesse Wilson } catch (Exception ignored) { 313320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson } 314320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson } 315320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson else { 316320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson break; 317320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson } 318320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson } 319f33eae7e84eb6d3b0f4e86b59605bb3de73009f3Elliott Hughes 320a7a70410e26802f3ab480b08a1ab499338cb6f7eJesse Wilson IoUtils.closeQuietly(rd); 321f33eae7e84eb6d3b0f4e86b59605bb3de73009f3Elliott Hughes 322320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson return resultFactory; 323320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson } 324f33eae7e84eb6d3b0f4e86b59605bb3de73009f3Elliott Hughes 325320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson /** 326f33eae7e84eb6d3b0f4e86b59605bb3de73009f3Elliott Hughes * Returns an {@link Iterator} that enumerates all 327320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson * the META-INF/services files that we care. 328320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson */ 329670c354edf01dcda0d9c4363a0996923bb30169bJesse Wilson private Iterable<URL> createServiceFileIterator() { 330320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson if (classLoader == null) { 331670c354edf01dcda0d9c4363a0996923bb30169bJesse Wilson URL resource = XPathFactoryFinder.class.getClassLoader().getResource(SERVICE_ID); 332670c354edf01dcda0d9c4363a0996923bb30169bJesse Wilson return Collections.singleton(resource); 333320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson } else { 334320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson try { 335670c354edf01dcda0d9c4363a0996923bb30169bJesse Wilson Enumeration<URL> e = classLoader.getResources(SERVICE_ID); 336320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson if (debug && !e.hasMoreElements()) { 337320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson debugPrintln("no "+SERVICE_ID+" file was found"); 338320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson } 339f33eae7e84eb6d3b0f4e86b59605bb3de73009f3Elliott Hughes 340670c354edf01dcda0d9c4363a0996923bb30169bJesse Wilson return Collections.list(e); 341320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson } catch (IOException e) { 342320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson if (debug) { 343320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson debugPrintln("failed to enumerate resources "+SERVICE_ID); 344320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson e.printStackTrace(); 345320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson } 346670c354edf01dcda0d9c4363a0996923bb30169bJesse Wilson return Collections.emptySet(); 347320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson } 348320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson } 349320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson } 350f33eae7e84eb6d3b0f4e86b59605bb3de73009f3Elliott Hughes 351320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson private static final Class SERVICE_CLASS = XPathFactory.class; 352320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson private static final String SERVICE_ID = "META-INF/services/" + SERVICE_CLASS.getName(); 353f33eae7e84eb6d3b0f4e86b59605bb3de73009f3Elliott Hughes 354320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson private static String which( Class clazz ) { 355320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson return which( clazz.getName(), clazz.getClassLoader() ); 356320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson } 357320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson 358320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson /** 359320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson * <p>Search the specified classloader for the given classname.</p> 360320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson * 361320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson * @param classname the fully qualified name of the class to search for 362320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson * @param loader the classloader to search 363f33eae7e84eb6d3b0f4e86b59605bb3de73009f3Elliott Hughes * 364320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson * @return the source location of the resource, or null if it wasn't found 365320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson */ 366320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson private static String which(String classname, ClassLoader loader) { 367320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson String classnameAsResource = classname.replace('.', '/') + ".class"; 368670c354edf01dcda0d9c4363a0996923bb30169bJesse Wilson if (loader==null) loader = ClassLoader.getSystemClassLoader(); 369f33eae7e84eb6d3b0f4e86b59605bb3de73009f3Elliott Hughes 370670c354edf01dcda0d9c4363a0996923bb30169bJesse Wilson URL it = loader.getResource(classnameAsResource); 371670c354edf01dcda0d9c4363a0996923bb30169bJesse Wilson return it != null ? it.toString() : null; 372320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson } 373320c9890e8241fb0ad05de6fa5e6c3eb3aece159Jesse Wilson} 374