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 */
017package org.apache.camel.impl;
018
019import java.io.InputStream;
020import java.net.URL;
021import java.util.Enumeration;
022
023import org.apache.camel.spi.ClassResolver;
024import org.apache.camel.util.CastUtils;
025import org.apache.camel.util.ObjectHelper;
026
027/**
028 * Default class resolver that uses regular class loader to load classes.
029 */
030public 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}