// ASM: a very small and fast Java bytecode manipulation framework
// Copyright (c) 2000-2011 INRIA, France Telecom
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package org.objectweb.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<String, String> mapping;

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