/** * Copyright 2010 Molindo GmbH * * 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.wicketstuff.mergedresources.versioning; import java.net.URL; import org.apache.wicket.util.string.Strings; public abstract class AbstractClasspathResourceVersionProvider implements IResourceVersionProvider { public final AbstractResourceVersion getVersion(Class<?> scope, String file) throws VersionException { final URL url = toURL(scope, file); if (url == null) { throw new VersionException(scope, file, "can't find file " + file + " for scope + " + scope); } return getVersion(url); } protected abstract AbstractResourceVersion getVersion(URL url) throws VersionException; /** * @return may return null, which will cause a VersionException */ protected URL toURL(final Class<?> scope, final String file) { final String path = getResourcePath(scope, file); URL url = scope.getClassLoader().getResource(path); if (url == null) { url = Thread.currentThread().getContextClassLoader().getResource(path); } return url; } protected String getResourcePath(final Class<?> scope, final String fileName) { final String file = Strings.beforeLast(scope.getName(), '.').replace('.', '/') + "/" + fileName; return file; } }