| /** |
| * Copyright (c) 2001, 2015 Thai Open Source Software Center Ltd |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: |
| * |
| * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * |
| * Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in |
| * the documentation and/or other materials provided with the |
| * distribution. |
| * |
| * Neither the name of the Thai Open Source Software Center Ltd nor |
| * the names of its contributors may be used to endorse or promote |
| * products derived from this software without specific prior written |
| * permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
| * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| package com.sun.xml.internal.org.relaxng.datatype.helpers; |
| |
| import com.sun.xml.internal.org.relaxng.datatype.DatatypeLibraryFactory; |
| import com.sun.xml.internal.org.relaxng.datatype.DatatypeLibrary; |
| import java.util.Enumeration; |
| import java.util.NoSuchElementException; |
| import java.util.Vector; |
| import java.io.Reader; |
| import java.io.InputStream; |
| import java.io.InputStreamReader; |
| import java.io.BufferedReader; |
| import java.io.IOException; |
| import java.io.UnsupportedEncodingException; |
| import java.net.URL; |
| |
| /** |
| * Discovers the datatype library implementation from the classpath. |
| * |
| * <p> |
| * The call of the createDatatypeLibrary method finds an implementation |
| * from a given datatype library URI at run-time. |
| */ |
| public class DatatypeLibraryLoader implements DatatypeLibraryFactory { |
| private final Service service = new Service(DatatypeLibraryFactory.class); |
| |
| public DatatypeLibrary createDatatypeLibrary(String uri) { |
| for (Enumeration e = service.getProviders(); |
| e.hasMoreElements();) { |
| DatatypeLibraryFactory factory |
| = (DatatypeLibraryFactory)e.nextElement(); |
| DatatypeLibrary library = factory.createDatatypeLibrary(uri); |
| if (library != null) |
| return library; |
| } |
| return null; |
| } |
| |
| private static class Service { |
| private final Class serviceClass; |
| private final Enumeration configFiles; |
| private Enumeration classNames = null; |
| private final Vector providers = new Vector(); |
| private Loader loader; |
| |
| private class ProviderEnumeration implements Enumeration { |
| private int nextIndex = 0; |
| |
| public boolean hasMoreElements() { |
| return nextIndex < providers.size() || moreProviders(); |
| } |
| |
| public Object nextElement() { |
| try { |
| return providers.elementAt(nextIndex++); |
| } |
| catch (ArrayIndexOutOfBoundsException e) { |
| throw new NoSuchElementException(); |
| } |
| } |
| } |
| |
| private static class Singleton implements Enumeration { |
| private Object obj; |
| private Singleton(Object obj) { |
| this.obj = obj; |
| } |
| |
| public boolean hasMoreElements() { |
| return obj != null; |
| } |
| |
| public Object nextElement() { |
| if (obj == null) |
| throw new NoSuchElementException(); |
| Object tem = obj; |
| obj = null; |
| return tem; |
| } |
| } |
| |
| // JDK 1.1 |
| private static class Loader { |
| Enumeration getResources(String resName) { |
| ClassLoader cl = Loader.class.getClassLoader(); |
| URL url; |
| if (cl == null) |
| url = ClassLoader.getSystemResource(resName); |
| else |
| url = cl.getResource(resName); |
| return new Singleton(url); |
| } |
| |
| Class loadClass(String name) throws ClassNotFoundException { |
| return Class.forName(name); |
| } |
| } |
| |
| // JDK 1.2+ |
| private static class Loader2 extends Loader { |
| private ClassLoader cl; |
| |
| Loader2() { |
| cl = Loader2.class.getClassLoader(); |
| // If the thread context class loader has the class loader |
| // of this class as an ancestor, use the thread context class |
| // loader. Otherwise, the thread context class loader |
| // probably hasn't been set up properly, so don't use it. |
| ClassLoader clt = Thread.currentThread().getContextClassLoader(); |
| for (ClassLoader tem = clt; tem != null; tem = tem.getParent()) |
| if (tem == cl) { |
| cl = clt; |
| break; |
| } |
| } |
| |
| Enumeration getResources(String resName) { |
| try { |
| return cl.getResources(resName); |
| } |
| catch (IOException e) { |
| return new Singleton(null); |
| } |
| } |
| |
| Class loadClass(String name) throws ClassNotFoundException { |
| return Class.forName(name, true, cl); |
| } |
| } |
| |
| public Service(Class cls) { |
| try { |
| loader = new Loader2(); |
| } |
| catch (NoSuchMethodError e) { |
| loader = new Loader(); |
| } |
| serviceClass = cls; |
| String resName = "META-INF/services/" + serviceClass.getName(); |
| configFiles = loader.getResources(resName); |
| } |
| |
| public Enumeration getProviders() { |
| return new ProviderEnumeration(); |
| } |
| |
| synchronized private boolean moreProviders() { |
| for (;;) { |
| while (classNames == null) { |
| if (!configFiles.hasMoreElements()) |
| return false; |
| classNames = parseConfigFile((URL)configFiles.nextElement()); |
| } |
| while (classNames.hasMoreElements()) { |
| String className = (String)classNames.nextElement(); |
| try { |
| Class cls = loader.loadClass(className); |
| Object obj = cls.newInstance(); |
| if (serviceClass.isInstance(obj)) { |
| providers.addElement(obj); |
| return true; |
| } |
| } |
| catch (ClassNotFoundException e) { } |
| catch (InstantiationException e) { } |
| catch (IllegalAccessException e) { } |
| catch (LinkageError e) { } |
| } |
| classNames = null; |
| } |
| } |
| |
| private static final int START = 0; |
| private static final int IN_NAME = 1; |
| private static final int IN_COMMENT = 2; |
| |
| private static Enumeration parseConfigFile(URL url) { |
| try { |
| InputStream in = url.openStream(); |
| Reader r; |
| try { |
| r = new InputStreamReader(in, "UTF-8"); |
| } |
| catch (UnsupportedEncodingException e) { |
| r = new InputStreamReader(in, "UTF8"); |
| } |
| r = new BufferedReader(r); |
| Vector tokens = new Vector(); |
| StringBuffer tokenBuf = new StringBuffer(); |
| int state = START; |
| for (;;) { |
| int n = r.read(); |
| if (n < 0) |
| break; |
| char c = (char)n; |
| switch (c) { |
| case '\r': |
| case '\n': |
| state = START; |
| break; |
| case ' ': |
| case '\t': |
| break; |
| case '#': |
| state = IN_COMMENT; |
| break; |
| default: |
| if (state != IN_COMMENT) { |
| state = IN_NAME; |
| tokenBuf.append(c); |
| } |
| break; |
| } |
| if (tokenBuf.length() != 0 && state != IN_NAME) { |
| tokens.addElement(tokenBuf.toString()); |
| tokenBuf.setLength(0); |
| } |
| } |
| if (tokenBuf.length() != 0) |
| tokens.addElement(tokenBuf.toString()); |
| return tokens.elements(); |
| } |
| catch (IOException e) { |
| return null; |
| } |
| } |
| } |
| |
| } |