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// ASM: a very small and fast Java bytecode manipulation framework
// Copyright (c) 2000-2011 INRIA, France Telecom
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
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// 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
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// 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"
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package org.eclipse.persistence.internal.libraries.asm.commons;

import java.util.Collections;
import java.util.Map;

/**
 * A {@link Remapper} using a {@link Map} to define its mapping.
 *
 * @author Eugene Kuleshov
 */
public class SimpleRemapper extends Remapper {

  private final Map mapping;

  /**
   * Constructs a new {@link SimpleRemapper} with the given mapping.
   *
   * @param mapping a map specifying a remapping as follows:
   *     
   *       for method names, the key is the owner, name and descriptor of the method (in the
   *           form <owner>.<name><descriptor>), and the value is the new method
   *           name.
   *       
for invokedynamic method names, the key is the name and descriptor of the method (in
   *           the form .<name><descriptor>), and the value is the new method name.
   *       
for field names, the key is the owner and name of the field (in the form
   *           <owner>.<name>), and the value is the new field name.
   *       
for internal names, the key is the old internal name, and the value is the new
   *           internal name.
   *     
   */
  public SimpleRemapper(final Map mapping) {
    this.mapping = mapping;
  }

  /**
   * Constructs a new {@link SimpleRemapper} with the given mapping.
   *
   * @param oldName the key corresponding to a method, field or internal name (see {@link
   *     #SimpleRemapper(Map)} for the format of these keys).
   * @param newName the new method, field or internal name.
   */
  public SimpleRemapper(final String oldName, final String newName) {
    this.mapping = Collections.singletonMap(oldName, newName);
  }

  @Override
  public String mapMethodName(final String owner, final String name, final String descriptor) {
    String remappedName = map(owner + '.' + name + descriptor);
    return remappedName == null ? name : remappedName;
  }

  @Override
  public String mapInvokeDynamicMethodName(final String name, final String descriptor) {
    String remappedName = map('.' + name + descriptor);
    return remappedName == null ? name : remappedName;
  }

  @Override
  public String mapFieldName(final String owner, final String name, final String descriptor) {
    String remappedName = map(owner + '.' + name);
    return remappedName == null ? name : remappedName;
  }

  @Override
  public String map(final String key) {
    return mapping.get(key);
  }
}