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Commons Attributes example source code file (AttributeValidatorTask.java)

This example Commons Attributes source code file (AttributeValidatorTask.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Commons Attributes tags/keywords

arraylist, buildexception, buildexception, file, file, io, iterator, jar, jarfile, list, net, network, path, string, string, suffix, util, validator, validator

The Commons Attributes AttributeValidatorTask.java source code

/*
 * Copyright 2003-2005 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.commons.attributes.validation;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.PrintWriter;
import java.io.PrintStream;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.jar.JarFile;
import java.util.jar.JarEntry;
import java.util.jar.JarOutputStream;

import org.apache.commons.attributes.AttributeRepositoryClass;
import org.apache.commons.attributes.Attributes;
import org.apache.commons.attributes.AttributeUtil;
import org.apache.commons.attributes.Indexed;
import org.apache.tools.ant.AntClassLoader;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.Task;
import org.apache.tools.ant.types.FileSet;
import org.apache.tools.ant.types.Path;

/**
 * Ant task that validates attributes. Usage:
 *
 * <pre>
 *     <taskdef resource="org/apache/commons/attributes/anttasks.properties"/>
 *     
 *     <attribute-validator jarFile="myclasses.jar">
 *         <classpath>
 *             ...
 *         </classpath>
 *         <validator class="my.Validator"/>
 *         <validator class="my.other.Validator"/>
 *     </attribute-validator>
 * </code>
* * The task will run the validator(s) with the classes the given jar file. */ public class AttributeValidatorTask extends Task { private File jarFile; private List classes = new ArrayList (); private List validators = new ArrayList (); private Path classPath; private File baseName; private boolean inMaven = false; public static class Validator { private String className; public void setClass (String className) { this.className = className; } public String getClassName () { return className; } } public void setJarfile (File jarFile) { this.jarFile = jarFile; } public void setBaseName (File baseName) { inMaven = true; this.baseName = baseName; } public Path createClasspath () { this.classPath = new Path(project); return classPath; } public Validator createValidator () { Validator validator = new Validator (); validators.add (validator); return validator; } private static final String SUFFIX = "$__attributeRepository.class"; protected void findJarFile () throws BuildException { File[] allFiles = baseName.getParentFile ().listFiles (); if (allFiles == null) { throw new BuildException ("Unable to find any file with base name " + baseName.getName () + " in " + baseName.getParentFile ().getPath ()); } long newestDate = 0; for (int i = 0; i < allFiles.length; i++) { String name = allFiles[i].getName (); if (name.startsWith (baseName.getName ()) && name.endsWith (".jar") && allFiles[i].lastModified () > newestDate) { jarFile = allFiles[i]; newestDate = allFiles[i].lastModified (); } } if (jarFile == null) { throw new BuildException ("Unable to find any file with base name " + baseName.getName () + " in " + baseName.getParentFile ().getPath ()); } } public void execute () throws BuildException { if (inMaven) { findJarFile (); } if (!jarFile.exists ()) { log ("Can't find " + jarFile.getPath ()); return; } try { log ("Validating attributes in " + jarFile.getPath ()); JarFile jar = new JarFile (jarFile); try { Enumeration e = jar.entries (); while (e.hasMoreElements ()) { JarEntry entry = (JarEntry) e.nextElement (); if (!entry.isDirectory ()) { String className = entry.getName (); if (className.endsWith (SUFFIX)) { className = className.replace ('/', '.').replace ('\\', '.').substring (0, className.length () - SUFFIX.length ()); classes.add (className); } } } } finally { jar.close (); } AntClassLoader cl = new AntClassLoader (this.getClass ().getClassLoader (), project, classPath, true); try { cl.addPathElement (jarFile.getPath ()); HashSet classesToValidate = new HashSet (); Iterator attrs = classes.iterator (); while (attrs.hasNext ()) { String className = (String) attrs.next (); Class clazz = cl.loadClass (className); classesToValidate.add (clazz); } Iterator iter = validators.iterator (); while (iter.hasNext ()) { Validator validator = (Validator) iter.next (); Class validatorClass = cl.loadClass (validator.getClassName ()); AttributeValidator attrValidator = (AttributeValidator) validatorClass.newInstance (); try { attrValidator.validate (classesToValidate); } catch (ValidationException ve) { throw new BuildException (ve.getInvalidClass () + " failed to validate: " + ve.getMessage ()); } } } finally { cl.cleanup (); } } catch (BuildException be) { throw be; } catch (Exception e) { e.printStackTrace (); throw new BuildException (e.toString ()); } } }

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