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+/*
+ * $HeadURL: http://svn.apache.org/repos/asf/httpcomponents/httpcore/trunk/module-main/src/main/java/org/apache/http/util/ExceptionUtils.java $
+ * $Revision: 613003 $
+ * $Date: 2008-01-17 15:00:42 -0800 (Thu, 17 Jan 2008) $
+ *
+ * ====================================================================
+ * 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.
+ * ====================================================================
+ *
+ * This software consists of voluntary contributions made by many
+ * individuals on behalf of the Apache Software Foundation. For more
+ * information on the Apache Software Foundation, please see
+ * <http://www.apache.org/>.
+ *
+ */
+package org.apache.http.util;
+
+import java.lang.reflect.Method;
+
+/**
+ * The home for utility methods that handle various exception-related tasks.
+ *
+ * @author <a href="mailto:oleg at ural.ru">Oleg Kalnichevski</a>
+ * @author <a href="mailto:laura@lwerner.org">Laura Werner</a>
+ *
+ * @since 4.0
+ */
+public final class ExceptionUtils {
+
+ /** A reference to Throwable's initCause method, or null if it's not there in this JVM */
+ static private final Method INIT_CAUSE_METHOD = getInitCauseMethod();
+
+ /**
+ * Returns a <code>Method<code> allowing access to
+ * {@link Throwable#initCause(Throwable) initCause} method of {@link Throwable},
+ * or <code>null</code> if the method
+ * does not exist.
+ *
+ * @return A <code>Method<code> for <code>Throwable.initCause</code>, or
+ * <code>null</code> if unavailable.
+ */
+ static private Method getInitCauseMethod() {
+ try {
+ Class[] paramsClasses = new Class[] { Throwable.class };
+ return Throwable.class.getMethod("initCause", paramsClasses);
+ } catch (NoSuchMethodException e) {
+ return null;
+ }
+ }
+
+ /**
+ * If we're running on JDK 1.4 or later, initialize the cause for the given throwable.
+ *
+ * @param throwable The throwable.
+ * @param cause The cause of the throwable.
+ */
+ public static void initCause(Throwable throwable, Throwable cause) {
+ if (INIT_CAUSE_METHOD != null) {
+ try {
+ INIT_CAUSE_METHOD.invoke(throwable, new Object[] { cause });
+ } catch (Exception e) {
+ // Well, with no logging, the only option is to munch the exception
+ }
+ }
+ }
+
+ private ExceptionUtils() {
+ }
+
+}