/**
* Copyright 2007 Google Inc.
*
* 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 com.tonicsystems.jarjar.transform.jar;
import com.tonicsystems.jarjar.transform.asm.ClassTransformer;
import com.tonicsystems.jarjar.transform.asm.GetNameClassWriter;
import com.tonicsystems.jarjar.transform.Transformable;
import com.tonicsystems.jarjar.util.ClassNameUtils;
import java.io.IOException;
import java.util.Arrays;
import java.util.List;
import javax.annotation.Nonnull;
import org.objectweb.asm.ClassReader;
import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.ClassWriter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* A JarProcessor which applies a list of {@link ClassTransformer ClassTransformers}
* to any files ending in .class.
*/
public class ClassTransformerJarProcessor implements JarProcessor {
private static final Logger LOG = LoggerFactory.getLogger(ClassTransformerJarProcessor.class);
private final List<ClassTransformer> classProcessors;
public ClassTransformerJarProcessor(@Nonnull List<ClassTransformer> classProcessors) {
this.classProcessors = classProcessors;
}
public ClassTransformerJarProcessor(@Nonnull ClassTransformer... classProcessors) {
this(Arrays.asList(classProcessors));
}
@Override
public Result scan(Transformable struct) throws IOException {
return Result.KEEP;
}
@Override
public Result process(Transformable struct) throws IOException {
if (ClassNameUtils.isClass(struct.name)) {
try {
ClassReader reader = new ClassReader(struct.data);
ClassWriter writer = new ClassWriter(ClassWriter.COMPUTE_MAXS);
GetNameClassWriter namer = new GetNameClassWriter(writer);
ClassVisitor cv = namer;
for (ClassTransformer classProcessor : classProcessors)
cv = classProcessor.transform(cv);
reader.accept(cv, ClassReader.EXPAND_FRAMES);
struct.name = ClassNameUtils.javaNameToPath(namer.getClassName());
struct.data = writer.toByteArray();
} catch (Exception e) {
LOG.warn("Failed to read class " + struct.name + ": " + e);
}
}
return Result.KEEP;
}
}