Source Code Cross Referenced for ClassUtils.java in  » Content-Management-System » apache-lenya-2.0 » org » apache » cocoon » util » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Content Management System » apache lenya 2.0 » org.apache.cocoon.util 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Licensed to the Apache Software Foundation (ASF) under one or more
003:         * contributor license agreements.  See the NOTICE file distributed with
004:         * this work for additional information regarding copyright ownership.
005:         * The ASF licenses this file to You under the Apache License, Version 2.0
006:         * (the "License"); you may not use this file except in compliance with
007:         * the License.  You may obtain a copy of the License at
008:         * 
009:         *      http://www.apache.org/licenses/LICENSE-2.0
010:         * 
011:         * Unless required by applicable law or agreed to in writing, software
012:         * distributed under the License is distributed on an "AS IS" BASIS,
013:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014:         * See the License for the specific language governing permissions and
015:         * limitations under the License.
016:         */
017:        package org.apache.cocoon.util;
018:
019:        import java.io.File;
020:        import java.io.IOException;
021:        import java.net.MalformedURLException;
022:        import java.net.URL;
023:
024:        /**
025:         * A collection of class management utility methods.
026:         *
027:         * @author <a href="mailto:ricardo@apache.org">Ricardo Rocha</a>
028:         * @author <a href="mailto:stefano@apache.org">Stefano Mazzocchi</a>
029:         * @version CVS $Id: ClassUtils.java 433543 2006-08-22 06:22:54Z crossley $
030:         */
031:        public class ClassUtils {
032:
033:            /**
034:             * Create a new instance given a class name
035:             *
036:             * @param className A class name
037:             * @return A new instance
038:             * @exception Exception If an instantiation error occurs
039:             */
040:            public static Object newInstance(String className) throws Exception {
041:                return ClassUtils.loadClass(className).newInstance();
042:            }
043:
044:            /**
045:             * Load a class given its name.
046:             * BL: We wan't to use a known ClassLoader--hopefully the hierarchy
047:             *     is set correctly.
048:             *
049:             * @param className A class name
050:             * @return The class pointed to by <code>className</code>
051:             * @exception ClassNotFoundException If a loading error occurs
052:             */
053:            public static Class loadClass(String className)
054:                    throws ClassNotFoundException {
055:                return ClassUtils.getClassLoader().loadClass(className);
056:            }
057:
058:            /**
059:             * Return a resource URL.
060:             * BL: if this is command line operation, the classloading issues
061:             *     are more sane.  During servlet execution, we explicitly set
062:             *     the ClassLoader.
063:             *
064:             * @return The context classloader.
065:             * @exception MalformedURLException If a loading error occurs
066:             */
067:            public static URL getResource(String resource)
068:                    throws MalformedURLException {
069:                return ClassUtils.getClassLoader().getResource(resource);
070:            }
071:
072:            /**
073:             * Return the context classloader.
074:             * BL: if this is command line operation, the classloading issues
075:             *     are more sane.  During servlet execution, we explicitly set
076:             *     the ClassLoader.
077:             *
078:             * @return The context classloader.
079:             */
080:            public static ClassLoader getClassLoader() {
081:                return Thread.currentThread().getContextClassLoader();
082:            }
083:
084:            /**
085:             * Tests if a class implements a given interface
086:             *
087:             * @return true if class implements given interface.
088:             * @deprecated Will be removed 2 versions after 2.1.5
089:             */
090:            public static boolean implements Interface(String className,
091:                    String iface) throws Exception {
092:                Class class1 = ClassUtils.loadClass(className);
093:                Class class2 = ClassUtils.loadClass(iface);
094:                return ClassUtils.implements Interface(class1, class2);
095:            }
096:
097:            /**
098:             * Tests if a class implements a given interface
099:             *
100:             * @return true if class implements given interface.
101:             * @deprecated Will be removed 2 versions after 2.1.5
102:             */
103:            public static boolean implements Interface(Class class1, Class iface) {
104:                return iface.isAssignableFrom(class1);
105:            }
106:
107:            /**
108:             * Determine the last modification date for this
109:             * class file or its enclosing library
110:             *
111:             * @param aClass A class whose last modification date is queried
112:             * @return The time the given class was last modified
113:             * @exception IOException IOError
114:             * @exception IllegalArgumentException The class was not loaded from a file
115:             * or directory
116:             * @deprecated Will be removed 2 versions after 2.1.5
117:             */
118:            public static long lastModified(Class aClass) throws IOException,
119:                    IllegalArgumentException {
120:                URL url = aClass.getProtectionDomain().getCodeSource()
121:                        .getLocation();
122:
123:                if (!url.getProtocol().equals("file")) {
124:                    throw new IllegalArgumentException(
125:                            "Class was not loaded from a file url");
126:                }
127:
128:                File directory = new File(url.getFile());
129:                if (!directory.isDirectory()) {
130:                    throw new IllegalArgumentException(
131:                            "Class was not loaded from a directory");
132:                }
133:
134:                String className = aClass.getName();
135:                String basename = className.substring(className
136:                        .lastIndexOf(".") + 1);
137:
138:                File file = new File(directory, basename + ".class");
139:
140:                return file.lastModified();
141:            }
142:
143:            /**
144:             * Gets the absolute pathname of the class file
145:             * containing the specified class name, as prescribed
146:             * by the current classpath.
147:             *
148:             * @param aClass Name of the class.
149:             * @deprecated Will be removed 2 versions after 2.1.5
150:             */
151:            public static String which(Class aClass) {
152:                String path = null;
153:                try {
154:                    path = aClass.getProtectionDomain().getCodeSource()
155:                            .getLocation().toString();
156:                } catch (Throwable t) {
157:                }
158:                return path;
159:            }
160:
161:        }
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