| /* |
| * The Apache Software License, Version 1.1 |
| * |
| * Copyright (c) 1999-2001 The Apache Software Foundation. All rights |
| * reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in |
| * the documentation and/or other materials provided with the |
| * distribution. |
| * |
| * 3. The end-user documentation included with the redistribution, if |
| * any, must include the following acknowlegement: |
| * "This product includes software developed by the |
| * Apache Software Foundation (http://www.apache.org/)." |
| * Alternately, this acknowlegement may appear in the software itself, |
| * if and wherever such third-party acknowlegements normally appear. |
| * |
| * 4. The names "The Jakarta Project", "Ant", and "Apache Software |
| * Foundation" must not be used to endorse or promote products derived |
| * from this software without prior written permission. For written |
| * permission, please contact apache@apache.org. |
| * |
| * 5. Products derived from this software may not be called "Apache" |
| * nor may "Apache" appear in their names without prior written |
| * permission of the Apache Group. |
| * |
| * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
| * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR |
| * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
| * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
| * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| * ==================================================================== |
| * |
| * This software consists of voluntary contributions made by many |
| * individuals on behalf of the Apache Software Foundation. For more |
| * information on the Apache Software Foundation, please see |
| * <http://www.apache.org/>. |
| */ |
| |
| package org.apache.tools.ant.taskdefs; |
| |
| import java.io.*; |
| import java.util.*; |
| import org.apache.tools.ant.*; |
| import org.apache.tools.ant.types.*; |
| |
| /** |
| * Will set the given property if the requested resource is available at runtime. |
| * |
| * @author Stefano Mazzocchi <a href="mailto:stefano@apache.org">stefano@apache.org</a> |
| */ |
| |
| public class Available extends Task { |
| |
| private String property; |
| private String classname; |
| private File file; |
| private String resource; |
| private Path classpath; |
| private AntClassLoader loader; |
| private String value = "true"; |
| |
| public void setClasspath(Path classpath) { |
| if (this.classpath == null) { |
| this.classpath = classpath; |
| } else { |
| this.classpath.append(classpath); |
| } |
| } |
| |
| public Path createClasspath() { |
| if (this.classpath == null) { |
| this.classpath = new Path(project); |
| } |
| return this.classpath.createPath(); |
| } |
| |
| public void setClasspathRef(Reference r) { |
| createClasspath().setRefid(r); |
| } |
| |
| public void setProperty(String property) { |
| this.property = property; |
| } |
| |
| public void setValue(String value) { |
| this.value = value; |
| } |
| |
| public void setClassname(String classname) { |
| if (!"".equals(classname)) { |
| this.classname = classname; |
| } |
| } |
| |
| public void setFile(File file) { |
| this.file = file; |
| } |
| |
| public void setResource(String resource) { |
| this.resource = resource; |
| } |
| |
| public void execute() throws BuildException { |
| if (property == null) { |
| throw new BuildException("property attribute is required", location); |
| } |
| |
| if (classname == null && file == null && resource == null) { |
| throw new BuildException("At least one of (classname|file|resource) is required", location); |
| } |
| |
| if (classpath != null) { |
| this.loader = new AntClassLoader(project, classpath, false); |
| } |
| |
| if ((classname != null) && !checkClass(classname)) return; |
| if ((file != null) && !checkFile(file)) return; |
| if ((resource != null) && !checkResource(resource)) return; |
| |
| this.project.setProperty(property, value); |
| } |
| |
| private boolean checkFile(File file) { |
| return file.exists(); |
| } |
| |
| private boolean checkResource(String resource) { |
| if (loader != null) { |
| return (loader.getResourceAsStream(resource) != null); |
| } else { |
| ClassLoader cL = this.getClass().getClassLoader(); |
| if (cL != null) { |
| return (cL.getResourceAsStream(resource) != null); |
| } else { |
| return |
| (ClassLoader.getSystemResourceAsStream(resource) != null); |
| } |
| } |
| } |
| |
| private boolean checkClass(String classname) { |
| try { |
| if (loader != null) { |
| loader.loadClass(classname); |
| } else { |
| ClassLoader l = this.getClass().getClassLoader(); |
| // Can return null to represent the bootstrap class loader. |
| // see API docs of Class.getClassLoader. |
| if (l != null) { |
| l.loadClass(classname); |
| } else { |
| Class.forName(classname); |
| } |
| } |
| return true; |
| } catch (ClassNotFoundException e) { |
| log("Class not found: " + classname, Project.MSG_VERBOSE); |
| return false; |
| } catch (NoClassDefFoundError e) { |
| log("Class cound not be loaded: " + classname, Project.MSG_VERBOSE); |
| return false; |
| } |
| } |
| } |