/*
* Copyright 2003,2004 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 net.sf.cglib.transform;
import java.io.*;
import java.net.MalformedURLException;
import java.util.*;
import java.util.zip.*;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
import net.sf.cglib.core.*;
import org.apache.tools.ant.*;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.ProjectComponent;
import org.objectweb.asm.*;
abstract public class AbstractTransformTask extends AbstractProcessTask {
private static final int ZIP_MAGIC = 0x504B0304;
private static final int CLASS_MAGIC = 0xCAFEBABE;
private boolean verbose;
public void setVerbose(boolean verbose) {
this.verbose = verbose;
}
/**
* returns transformation for source class
*
* @param classInfo
* class information
* class name := classInfo[ 0 ]
* super class name := classInfo[ 1 ]
* interfaces := classInfo[ >1 ]
*/
abstract protected ClassTransformer getClassTransformer(String[] classInfo);
protected Attribute[] attributes() {
return null;
}
protected void processFile(File file) throws Exception {
if (isClassFile(file)) {
processClassFile(file);
} else if (isJarFile(file)) {
processJarFile(file);
} else {
log("ignoring " + file.toURL(), Project.MSG_WARN);
}
}
/**
* @param file
* @throws Exception
* @throws FileNotFoundException
* @throws IOException
* @throws MalformedURLException
*/
private void processClassFile(File file) throws Exception,
FileNotFoundException, IOException, MalformedURLException {
ClassReader reader = getClassReader(file);
String name[] = ClassNameReader.getClassInfo(reader);
ClassWriter w = new DebuggingClassWriter(ClassWriter.COMPUTE_MAXS);
ClassTransformer t = getClassTransformer(name);
if (t != null) {
if (verbose) {
log("processing " + file.toURL());
}
new TransformingClassGenerator(new ClassReaderGenerator(
getClassReader(file), attributes(), getFlags()), t)
.generateClass(w);
FileOutputStream fos = new FileOutputStream(file);
try {
fos.write(w.toByteArray());
} finally {
fos.close();
}
}
}
protected int getFlags() {
return 0;
}
private static ClassReader getClassReader(File file) throws Exception {
InputStream in = new BufferedInputStream(new FileInputStream(file));
try {
ClassReader r = new ClassReader(in);
return r;
} finally {
in.close();
}
}
protected boolean isClassFile(File file) throws IOException {
return checkMagic(file, CLASS_MAGIC);
}
protected void processJarFile(File file) throws Exception {
if (verbose) {
log("processing " + file.toURL());
}
File tempFile = File.createTempFile(file.getName(), null, new File(file
.getAbsoluteFile().getParent()));
try{
ZipInputStream zip = new ZipInputStream(new FileInputStream(file));
try {
FileOutputStream fout = new FileOutputStream(tempFile);
try{
ZipOutputStream out = new ZipOutputStream(fout);
ZipEntry entry;
while ((entry = zip.getNextEntry()) != null) {
byte bytes[] = getBytes(zip);
if (!entry.isDirectory()) {
DataInputStream din = new DataInputStream(
new ByteArrayInputStream(bytes)
);
if (din.readInt() == CLASS_MAGIC) {
bytes = process(bytes);
} else {
if (verbose) {
log("ignoring " + entry.toString());
}
}
}
ZipEntry outEntry = new ZipEntry(entry.getName());
outEntry.setMethod(entry.getMethod());
outEntry.setComment(entry.getComment());
outEntry.setSize(bytes.length);
if(outEntry.getMethod() == ZipEntry.STORED){
CRC32 crc = new CRC32();
crc.update(bytes);
outEntry.setCrc( crc.getValue() );
outEntry.setCompressedSize(bytes.length);
}
out.putNextEntry(outEntry);
out.write(bytes);
out.closeEntry();
zip.closeEntry();
}
out.close();
}finally{
fout.close();
}
} finally {
zip.close();
}
if(file.delete()){
File newFile = new File(tempFile.getAbsolutePath());
if(!newFile.renameTo(file)){
throw new IOException("can not rename " + tempFile + " to " + file);
}
}else{
throw new IOException("can not delete " + file);
}
}finally{
tempFile.delete();
}
}
/**
* @param bytes
* @return
* @throws IOException
* @throws Exception
*/
private byte[] process(byte[] bytes) throws Exception {
ClassReader reader = new ClassReader(new ByteArrayInputStream(bytes));
String name[] = ClassNameReader.getClassInfo(reader);
ClassWriter w = new DebuggingClassWriter(ClassWriter.COMPUTE_MAXS);
ClassTransformer t = getClassTransformer(name);
if (t != null) {
if (verbose) {
log("processing " + name[0]);
}
new TransformingClassGenerator(new ClassReaderGenerator(
new ClassReader(new ByteArrayInputStream(bytes)),
attributes(), getFlags()), t).generateClass(w);
ByteArrayOutputStream out = new ByteArrayOutputStream();
out.write(w.toByteArray());
return out.toByteArray();
}
return bytes;
}
/**
* @param zip
* @return
* @throws IOException
*/
private byte[] getBytes(ZipInputStream zip) throws IOException {
ByteArrayOutputStream bout = new ByteArrayOutputStream();
InputStream in = new BufferedInputStream(zip);
int b;
while ((b = in.read()) != -1) {
bout.write(b);
}
return bout.toByteArray();
}
private boolean checkMagic(File file, long magic) throws IOException {
DataInputStream in = new DataInputStream(new FileInputStream(file));
try {
int m = in.readInt();
return magic == m;
} finally {
in.close();
}
}
protected boolean isJarFile(File file) throws IOException {
return checkMagic(file, ZIP_MAGIC);
}
}