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.camel.impl;
018    
019    import java.io.InputStream;
020    import java.net.URL;
021    import java.util.Enumeration;
022    
023    import org.apache.camel.spi.ClassResolver;
024    import org.apache.camel.util.CastUtils;
025    import org.apache.camel.util.ObjectHelper;
026    
027    /**
028     * Default class resolver that uses regular class loader to load classes.
029     */
030    public class DefaultClassResolver implements ClassResolver {
031    
032        public Class<?> resolveClass(String name) {
033            return loadClass(name, DefaultClassResolver.class.getClassLoader());
034        }
035    
036        public <T> Class<T> resolveClass(String name, Class<T> type) {
037            Class<T> answer = CastUtils.cast(loadClass(name, DefaultClassResolver.class.getClassLoader()));
038            return answer;
039        }
040    
041        public Class<?> resolveClass(String name, ClassLoader loader) {
042            return loadClass(name, loader);
043        }
044    
045        public <T> Class<T> resolveClass(String name, Class<T> type, ClassLoader loader) {
046            Class<T> answer = CastUtils.cast(loadClass(name, loader));
047            return answer;
048        }
049    
050        public Class<?> resolveMandatoryClass(String name) throws ClassNotFoundException {
051            Class<?> answer = resolveClass(name);
052            if (answer == null) {
053                throw new ClassNotFoundException(name);
054            }
055            return answer;
056        }
057    
058        public <T> Class<T> resolveMandatoryClass(String name, Class<T> type) throws ClassNotFoundException {
059            Class<T> answer = resolveClass(name, type);
060            if (answer == null) {
061                throw new ClassNotFoundException(name);
062            }
063            return answer;
064        }
065    
066        public Class<?> resolveMandatoryClass(String name, ClassLoader loader) throws ClassNotFoundException {
067            Class<?> answer = resolveClass(name, loader);
068            if (answer == null) {
069                throw new ClassNotFoundException(name);
070            }
071            return answer;
072        }
073    
074        public <T> Class<T> resolveMandatoryClass(String name, Class<T> type, ClassLoader loader) throws ClassNotFoundException {
075            Class<T> answer = resolveClass(name, type, loader);
076            if (answer == null) {
077                throw new ClassNotFoundException(name);
078            }
079            return answer;
080        }
081    
082        public InputStream loadResourceAsStream(String uri) {
083            ObjectHelper.notEmpty(uri, "uri");
084            return ObjectHelper.loadResourceAsStream(uri);
085        }
086    
087        public URL loadResourceAsURL(String uri) {
088            ObjectHelper.notEmpty(uri, "uri");
089            return ObjectHelper.loadResourceAsURL(uri);
090        }
091    
092        public Enumeration<URL> loadResourcesAsURL(String uri) {
093            return loadAllResourcesAsURL(uri);
094        }
095    
096        @Override
097        public Enumeration<URL> loadAllResourcesAsURL(String uri) {
098            ObjectHelper.notEmpty(uri, "uri");
099            return ObjectHelper.loadResourcesAsURL(uri);
100        }
101    
102        protected Class<?> loadClass(String name, ClassLoader loader) {
103            ObjectHelper.notEmpty(name, "name");
104            return ObjectHelper.loadClass(name, loader);
105        }
106    }