| // Copyright 2006, 2007, 2008 The Apache Software Foundation |
| // |
| // Licensed 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. |
| |
| package org.apache.tapestry5.ioc.internal.util; |
| |
| import org.apache.tapestry5.ioc.Resource; |
| import static org.apache.tapestry5.ioc.internal.util.Defense.notNull; |
| |
| import java.net.URL; |
| |
| /** |
| * Implementation of {@link Resource} for files on the classpath (as defined by a {@link ClassLoader}). |
| */ |
| public final class ClasspathResource extends AbstractResource |
| { |
| private final ClassLoader classLoader; |
| |
| // Guarded by this |
| private URL url; |
| |
| // Guarded by this |
| private boolean urlResolved; |
| |
| public ClasspathResource(String path) |
| { |
| this(Thread.currentThread().getContextClassLoader(), path); |
| } |
| |
| public ClasspathResource(ClassLoader classLoader, String path) |
| { |
| super(path); |
| |
| notNull(classLoader, "classLoader"); |
| |
| this.classLoader = classLoader; |
| } |
| |
| @Override |
| protected Resource newResource(String path) |
| { |
| return new ClasspathResource(classLoader, path); |
| } |
| |
| public synchronized URL toURL() |
| { |
| if (!urlResolved) |
| { |
| url = classLoader.getResource(getPath()); |
| urlResolved = true; |
| } |
| |
| return url; |
| } |
| |
| @Override |
| public boolean equals(Object obj) |
| { |
| if (obj == null) return false; |
| |
| if (obj == this) return true; |
| |
| if (obj.getClass() != getClass()) return false; |
| |
| ClasspathResource other = (ClasspathResource) obj; |
| |
| return other.classLoader == classLoader && other.getPath().equals(getPath()); |
| } |
| |
| @Override |
| public int hashCode() |
| { |
| return 227 ^ getPath().hashCode(); |
| } |
| |
| @Override |
| public String toString() |
| { |
| return "classpath:" + getPath(); |
| } |
| |
| } |