X-Git-Url: http://source.jalview.org/gitweb/?a=blobdiff_plain;f=srcjar_unused%2Forg%2Fapache%2Flog4j%2Fhelpers%2FLoader.java;fp=srcjar_unused%2Forg%2Fapache%2Flog4j%2Fhelpers%2FLoader.java;h=d789f5afda35fe5548efadfd76cddeb701efa11f;hb=ec8f3cedf60fb1feed6d34de6b49f6bfa78b9dd8;hp=0000000000000000000000000000000000000000;hpb=056dad85a910551cc95e44d451a61f6b8c4dd35d;p=jalview.git diff --git a/srcjar_unused/org/apache/log4j/helpers/Loader.java b/srcjar_unused/org/apache/log4j/helpers/Loader.java new file mode 100644 index 0000000..d789f5a --- /dev/null +++ b/srcjar_unused/org/apache/log4j/helpers/Loader.java @@ -0,0 +1,201 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package org.apache.log4j.helpers; + +import java.net.URL; +import java.lang.reflect.Method; +import java.lang.reflect.InvocationTargetException; +import java.io.InterruptedIOException; + + +/** + Load resources (or images) from various sources. + + @author Ceki Gülcü + */ + +public class Loader { + + static final String TSTR = "Caught Exception while in Loader.getResource. This may be innocuous."; + + // We conservatively assume that we are running under Java 1.x + static private boolean java1 = true; + + static private boolean ignoreTCL = false; + + static { + String prop = OptionConverter.getSystemProperty("java.version", null); + + if(prop != null) { + int i = prop.indexOf('.'); + if(i != -1) { + if(prop.charAt(i+1) != '1') { + java1 = false; + } + } + } + String ignoreTCLProp = OptionConverter.getSystemProperty("log4j.ignoreTCL", null); + if(ignoreTCLProp != null) { + ignoreTCL = OptionConverter.toBoolean(ignoreTCLProp, true); + } + } + + /** + * Get a resource by delegating to getResource(String). + * @param resource resource name + * @param clazz class, ignored. + * @return URL to resource or null. + * @deprecated as of 1.2. + */ + public static URL getResource(String resource, Class clazz) { + return getResource(resource); + } + + /** + This method will search for resource in different + places. The search order is as follows: + +
    + +

  1. Search for resource using the thread context + class loader under Java2. If that fails, search for + resource using the class loader that loaded this + class (Loader). Under JDK 1.1, only the the class + loader that loaded this class (Loader) is used. + +

  2. Try one last time with + ClassLoader.getSystemResource(resource), that is is + using the system class loader in JDK 1.2 and virtual machine's + built-in class loader in JDK 1.1. + +
+ */ + static public URL getResource(String resource) { + ClassLoader classLoader = null; + URL url = null; + + try { + if(!java1 && !ignoreTCL) { + classLoader = getTCL(); + if(classLoader != null) { + LogLog.debug("Trying to find ["+resource+"] using context classloader " + +classLoader+"."); + url = classLoader.getResource(resource); + if(url != null) { + return url; + } + } + } + + // We could not find resource. Ler us now try with the + // classloader that loaded this class. + classLoader = Loader.class.getClassLoader(); + if(classLoader != null) { + LogLog.debug("Trying to find ["+resource+"] using "+classLoader + +" class loader."); + url = classLoader.getResource(resource); + if(url != null) { + return url; + } + } + } catch(IllegalAccessException t) { + LogLog.warn(TSTR, t); + } catch(InvocationTargetException t) { + if (t.getTargetException() instanceof InterruptedException + || t.getTargetException() instanceof InterruptedIOException) { + Thread.currentThread().interrupt(); + } + LogLog.warn(TSTR, t); + } catch(Throwable t) { + // + // can't be InterruptedException or InterruptedIOException + // since not declared, must be error or RuntimeError. + LogLog.warn(TSTR, t); + } + + // Last ditch attempt: get the resource from the class path. It + // may be the case that clazz was loaded by the Extentsion class + // loader which the parent of the system class loader. Hence the + // code below. + LogLog.debug("Trying to find ["+resource+ + "] using ClassLoader.getSystemResource()."); + return ClassLoader.getSystemResource(resource); + } + + /** + Are we running under JDK 1.x? + */ + public + static + boolean isJava1() { + return java1; + } + + /** + * Get the Thread Context Loader which is a JDK 1.2 feature. If we + * are running under JDK 1.1 or anything else goes wrong the method + * returns null. + * + * */ + private static ClassLoader getTCL() throws IllegalAccessException, + InvocationTargetException { + + // Are we running on a JDK 1.2 or later system? + Method method = null; + try { + method = Thread.class.getMethod("getContextClassLoader", null); + } catch (NoSuchMethodException e) { + // We are running on JDK 1.1 + return null; + } + + return (ClassLoader) method.invoke(Thread.currentThread(), null); + } + + + + /** + * If running under JDK 1.2 load the specified class using the + * Thread contextClassLoader if that + * fails try Class.forname. Under JDK 1.1 only Class.forName is + * used. + * + */ + static public Class loadClass (String clazz) throws ClassNotFoundException { + // Just call Class.forName(clazz) if we are running under JDK 1.1 + // or if we are instructed to ignore the TCL. + if(java1 || ignoreTCL) { + return Class.forName(clazz); + } else { + try { + return getTCL().loadClass(clazz); + } + // we reached here because tcl was null or because of a + // security exception, or because clazz could not be loaded... + // In any case we now try one more time + catch(InvocationTargetException e) { + if (e.getTargetException() instanceof InterruptedException + || e.getTargetException() instanceof InterruptedIOException) { + Thread.currentThread().interrupt(); + } + } catch(Throwable t) { + } + } + return Class.forName(clazz); + } +}