| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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.tools.ant.taskdefs; |
| |
| import org.apache.tools.ant.types.Path; |
| import org.apache.tools.ant.types.Reference; |
| import org.apache.tools.ant.Task; |
| import org.apache.tools.ant.BuildException; |
| import org.apache.tools.ant.Project; |
| import org.apache.tools.ant.AntClassLoader; |
| |
| import java.net.URL; |
| |
| /** |
| * Find a class or resource on the supplied classpath, or the |
| * system classpath if none is supplied. The named property is set if |
| * the item can be found. For example |
| * <pre> |
| * <whichresource resource="/log4j.properties" |
| * property="log4j.url" > |
| * </pre> |
| * @since Ant 1.6 |
| * @ant.attribute.group name="oneof" description="Exactly one of these two" |
| */ |
| public class WhichResource extends Task { |
| /** |
| * our classpath |
| */ |
| private Path classpath; |
| |
| /** |
| * class to look for |
| */ |
| private String classname; |
| |
| /** |
| * resource to look for |
| */ |
| private String resource; |
| |
| /** |
| * property to set |
| */ |
| private String property; |
| |
| |
| /** |
| * Set the classpath to be used for this compilation. |
| * @param cp the classpath to be used. |
| */ |
| public void setClasspath(Path cp) { |
| if (classpath == null) { |
| classpath = cp; |
| } else { |
| classpath.append(cp); |
| } |
| } |
| |
| /** |
| * Adds a path to the classpath. |
| * @return a classpath to be configured. |
| */ |
| public Path createClasspath() { |
| if (classpath == null) { |
| classpath = new Path(getProject()); |
| } |
| return classpath.createPath(); |
| } |
| |
| /** |
| * Set the classpath to use by reference. |
| * |
| * @param r a reference to an existing classpath. |
| * @since Ant 1.7.1 |
| */ |
| public void setClasspathRef(Reference r) { |
| createClasspath().setRefid(r); |
| } |
| |
| /** |
| * validate |
| */ |
| private void validate() { |
| int setcount = 0; |
| if (classname != null) { |
| setcount++; |
| } |
| if (resource != null) { |
| setcount++; |
| } |
| |
| |
| if (setcount == 0) { |
| throw new BuildException( |
| "One of classname or resource must be specified"); |
| } |
| if (setcount > 1) { |
| throw new BuildException( |
| "Only one of classname or resource can be specified"); |
| } |
| if (property == null) { |
| throw new BuildException("No property defined"); |
| } |
| } |
| |
| /** |
| * execute it |
| * @throws BuildException on error |
| */ |
| public void execute() throws BuildException { |
| validate(); |
| if (classpath != null) { |
| getProject().log("using user supplied classpath: " + classpath, |
| Project.MSG_DEBUG); |
| classpath = classpath.concatSystemClasspath("ignore"); |
| } else { |
| classpath = new Path(getProject()); |
| classpath = classpath.concatSystemClasspath("only"); |
| getProject().log("using system classpath: " + classpath, Project.MSG_DEBUG); |
| } |
| AntClassLoader loader; |
| loader = new AntClassLoader(getProject().getCoreLoader(), |
| getProject(), |
| classpath, false); |
| String loc = null; |
| if (classname != null) { |
| //convert a class name into a resource |
| resource = classname.replace('.', '/') + ".class"; |
| } |
| |
| if (resource == null) { |
| throw new BuildException("One of class or resource is required"); |
| } |
| |
| if (resource.startsWith("/")) { |
| resource = resource.substring(1); |
| } |
| |
| log("Searching for " + resource, Project.MSG_VERBOSE); |
| URL url; |
| url = loader.getResource(resource); |
| if (url != null) { |
| //set the property |
| loc = url.toExternalForm(); |
| getProject().setNewProperty(property, loc); |
| } |
| } |
| |
| /** |
| * name the resource to look for |
| * @param resource the name of the resource to look for. |
| * @ant.attribute group="oneof" |
| */ |
| public void setResource(String resource) { |
| this.resource = resource; |
| } |
| |
| /** |
| * name the class to look for |
| * @param classname the name of the class to look for. |
| * @ant.attribute group="oneof" |
| */ |
| public void setClass(String classname) { |
| this.classname = classname; |
| } |
| |
| /** |
| * the property to fill with the URL of the resource or class |
| * @param property the property to be set. |
| * @ant.attribute group="required" |
| */ |
| public void setProperty(String property) { |
| this.property = property; |
| } |
| |
| } |