org.xtend.enhance.batch.ClassFileDebugSourceExtractor Maven / Gradle / Ivy

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package org.xtend.enhance.batch;

import java.io.File;
import java.io.IOException;

import org.objectweb.asm.ClassReader;
import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.Opcodes;

import com.google.common.io.Files;

public class ClassFileDebugSourceExtractor {

	protected static class Visitor extends ClassVisitor {
  
    protected Visitor() {
      super(Opcodes.ASM5);
    }
		protected String source;

		@Override
		public void visitSource(String arg0, String arg1) {
			this.source = arg0;
		}
	}

	public String getDebugSourceFileName(File classFile) throws IOException {
		ClassReader cr = new ClassReader(Files.toByteArray(classFile));
		Visitor visitor = new Visitor();
		cr.accept(visitor, ClassReader.SKIP_CODE | ClassReader.SKIP_FRAMES);
		return visitor.source;
	}
}