/*-
    * #%L
    * io.earcam.instrumental.agent.defy
    * %%
    * Copyright (C) 2018 earcam
    * %%
    * SPDX-License-Identifier: (BSD-3-Clause OR EPL-1.0 OR Apache-2.0 OR MIT)
    * 
    * You <b>must</b> choose to accept, in full - any individual or combination of 
   * the following licenses:
   * <ul>
   * 	<li><a href="https://opensource.org/licenses/BSD-3-Clause">BSD-3-Clause</a></li>
   * 	<li><a href="https://www.eclipse.org/legal/epl-v10.html">EPL-1.0</a></li>
   * 	<li><a href="https://www.apache.org/licenses/LICENSE-2.0">Apache-2.0</a></li>
   * 	<li><a href="https://opensource.org/licenses/MIT">MIT</a></li>
   * </ul>
   * #L%
   */
  package io.earcam.instrumental.agent.defy;
  
  import static org.objectweb.asm.Opcodes.ACC_FINAL;
  import static org.objectweb.asm.Opcodes.ACC_INTERFACE;
  import static org.objectweb.asm.Opcodes.ASM6;
  
  import org.objectweb.asm.ClassVisitor;
  import org.objectweb.asm.FieldVisitor;
  import org.objectweb.asm.MethodVisitor;
  
  class RemoveFinalVisitor extends ClassVisitor {
  
  	private boolean isInterface;
  
  
  	RemoveFinalVisitor(ClassVisitor cv)
  	{
  		super(ASM6, cv);
  	}
  
  
  	@Override
  	public void visit(int version, int access, String name, String signature, String superName, String[] interfaces)
  	{
  		isInterface = isInterface(access);
  		cv.visit(version, removeFinalModifier(access), name, signature, superName, interfaces);
  	}
  
  
  	private boolean isInterface(int access)
  	{
  		return (access & ACC_INTERFACE) == ACC_INTERFACE;
  	}
  
  
  	private int removeFinalModifier(int access)
  	{
  		return isInterface ? access : access & ~ACC_FINAL;
  	}
  
  
  	@Override
  	public MethodVisitor visitMethod(int access, String name, String desc, String signature, String[] exceptions)
  	{
  		return super.visitMethod(removeFinalModifier(access), name, desc, signature, exceptions);
  	}
  
  
  	@Override
  	public FieldVisitor visitField(int access, String name, String desc, String signature, Object value)
  	{
  		return super.visitField(removeFinalModifier(access), name, desc, signature, value);
  	}
  }