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Commons Attributes example source code file (AttributeIndexer.java)
This example Commons Attributes source code file (AttributeIndexer.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.
The Commons Attributes AttributeIndexer.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.compiler;
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 to compile attribute indexes. Usage:
*
* <pre>
* <taskdef resource="org/apache/commons/attributes/anttasks.properties"/>
*
* <attribute-indexer jarFile="myclasses.jar">
* <classpath>
* ...
* </classpath>
* </attribute-indexer>
* </code>
*
* The task will inspect the classes in the given jar and add a <tt>META-INF/attrs.index
* file to it, which contains the index information. The classpath element is required and
* must contain all dependencies for the attributes used.
*/
public class AttributeIndexer extends Task {
private File jarFile;
private List classes = new ArrayList ();
private Path classPath;
private File baseName;
private boolean inMaven = false;
private final static String INDEX_FILENAME = "META-INF/attrs.index";
public AttributeIndexer () {
}
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;
}
private static final String SUFFIX = "$__attributeRepository.class";
protected void copyEntry (JarFile jar, JarEntry entry, JarOutputStream outputStream) throws Exception {
outputStream.putNextEntry (entry);
if (!entry.isDirectory ()) {
InputStream is = new BufferedInputStream (jar.getInputStream (entry));
try {
byte[] buffer = new byte[16384];
while (true) {
int numRead = is.read (buffer, 0, 16384);
if (numRead == 0 || numRead == -1) {
break;
}
outputStream.write (buffer, 0, numRead);
}
} finally {
is.close ();
}
}
}
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 ("Creating attribute index for " + jarFile.getPath ());
JarFile jar = new JarFile (jarFile);
File newJarFile = new File (jarFile.getPath () + ".new");
JarOutputStream output = new JarOutputStream (new FileOutputStream (newJarFile));
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);
}
}
if (!entry.getName ().equals (INDEX_FILENAME)) {
copyEntry (jar, entry, output);
}
}
output.putNextEntry (new JarEntry (INDEX_FILENAME));
Iterator attrs = classes.iterator ();
while (attrs.hasNext ()) {
String className = (String) attrs.next ();
output.write (("Class: " + className + "\n").getBytes ());
}
} finally {
output.close ();
jar.close ();
}
jarFile.delete ();
newJarFile.renameTo (jarFile);
} catch (Exception e) {
e.printStackTrace ();
throw new BuildException (e.toString ());
}
}
}
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