com.thoughtworks.paranamer.generator.Enhancer Maven / Gradle / Ivy
/***
*
* Copyright (c) 2007 Paul Hammant
* 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. Neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS 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 COPYRIGHT OWNER OR 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
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*/
package com.thoughtworks.paranamer.generator;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import org.objectweb.asm.ClassReader;
import org.objectweb.asm.ClassWriter;
import org.objectweb.asm.Opcodes;
/**
* A bytecode enhancer which adds a new static variable to some specific class.
*
* @author Guilherme Silveira
*/
public class Enhancer implements Opcodes {
public void enhance(File classFile, String parameterNameData)
throws IOException {
byte[] classBytecode = addExtraStaticField(classFile, parameterNameData);
FileOutputStream os = new FileOutputStream(classFile);
os.write(classBytecode);
os.close();
}
private byte[] addExtraStaticField(File classFile,
final String parameterNameData) throws IOException {
InputStream inputStream = new FileInputStream(classFile);
ClassReader reader = new ClassReader(inputStream);
ClassWriter writer = new ClassWriter(reader, 0);
// TODO fix problem with inner classes, two classes in one classFile and
// so on...
// TODO doc typo on page 21: recommended
AddFieldAdapter adapter = new AddFieldAdapter(writer, ACC_PUBLIC
+ ACC_FINAL + ACC_STATIC, "__PARANAMER_DATA",
"Ljava/lang/String;", parameterNameData);
reader.accept(adapter, 0);
inputStream.close();
return writer.toByteArray();
}
}
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