Commons Attributes example source code file (AttributeIndexer.java)
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>
*
* 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 ());
}
}
}
Other Commons Attributes examples (source code examples)Here is a short list of links related to this Commons Attributes AttributeIndexer.java source code file: |
The search page
Other Commons Attributes source code examples at this package level
Click here to learn more about this project
