001 /* ====================================================================
002 * The Apache Software License, Version 1.1
003 *
004 * Copyright (c) 2003 The Apache Software Foundation. All rights
005 * reserved.
006 *
007 * Redistribution and use in source and binary forms, with or without
008 * modification, are permitted provided that the following conditions
009 * are met:
010 *
011 * 1. Redistributions of source code must retain the above copyright
012 * notice, this list of conditions and the following disclaimer.
013 *
014 * 2. Redistributions in binary form must reproduce the above copyright
015 * notice, this list of conditions and the following disclaimer in
016 * the documentation and/or other materials provided with the
017 * distribution.
018 *
019 * 3. The end-user documentation included with the redistribution,
020 * if any, must include the following acknowledgment:
021 * "This product includes software developed by the
022 * Apache Software Foundation (http://www.apache.org/)."
023 * Alternately, this acknowledgment may appear in the software itself,
024 * if and wherever such third-party acknowledgments normally appear.
025 *
026 * 4. The names "The Jakarta Project", "Commons", and "Apache Software
027 * Foundation" must not be used to endorse or promote products derived
028 * from this software without prior written permission. For written
029 * permission, please contact apache@apache.org.
030 *
031 * 5. Products derived from this software may not be called "Apache",
032 * nor may "Apache" appear in their name, without prior written
033 * permission of the Apache Software Foundation.
034 *
035 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
036 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
037 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
038 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
039 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
040 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
041 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
042 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
043 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
044 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
045 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
046 * SUCH DAMAGE.
047 * ====================================================================
048 *
049 * This software consists of voluntary contributions made by many
050 * individuals on behalf of the Apache Software Foundation. For more
051 * information on the Apache Software Foundation, please see
052 * <http://www.apache.org/>.
053 *
054 */
055 package org.jpu.patterns.common;
056
057 import java.util.Arrays;
058 import java.util.Collection;
059 import java.util.List;
060
061 import org.apache.commons.collections.CollectionUtils;
062 import org.apache.commons.collections.Predicate;
063 import org.apache.commons.lang.ClassUtils;
064 import org.apache.commons.lang.exception.NestableRuntimeException;
065 import org.apache.commons.logging.Log;
066 import org.apache.commons.logging.LogFactory;
067
068 public class JPUClassUtils {
069 private static Log _log = LogFactory.getLog(JPUClassUtils.class);
070
071 public static class IsAssignable implements Predicate {
072 public IsAssignable(Class toClass) {
073 _toClass = toClass;
074 }
075 public boolean evaluate(Object object) {
076 Class c = (Class)object;
077 return ClassUtils.isAssignable(c, _toClass);
078 }
079 private Class _toClass = null;
080 }
081
082 public static boolean areAnyAssignable(Collection classesToTest, Class toClass) {
083 return CollectionUtils.find( classesToTest, new IsAssignable(toClass) ) != null;
084 }
085
086 /**
087 * Rethrows the given <code>Throwable</code> in a manner designed to avoid <code>UndeclaredThrowableException</code>'s.
088 * If the given <code>Throwable</code> is an <code>Error</code> or <code>RuntimeException</code>, it is simply rethrown. Else its type is checked
089 * for assignment compatibility with the classes given by <code>acceptableTypes</code>. If it is type
090 * compatible, it is rethrown; else it is wrapped in a <code>NestableRuntimeException</code> which is then thrown.
091 * <p>
092 * Typically this method would be used for rethrowing exceptions caught inside an invocation handler's <code>invoke()</code>
093 * method.
094 */
095 public static void rethrowSafely(Throwable t, Class[] acceptableTypes) throws Throwable {
096 if ( t instanceof Error || t instanceof RuntimeException ) {
097 throw t;
098 }
099 List exceptions = Arrays.asList( acceptableTypes );
100 if ( JPUClassUtils.areAnyAssignable( exceptions, t.getClass() ) ) {
101 throw t;
102 }
103 throw new NestableRuntimeException(t);
104 }
105
106 }
107