plastic/src/external/java/org/apache/tapestry5/internal/plastic/asm/tree/LabelNode.java

// 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
// are met:
// 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
//    documentation and/or other materials provided with the distribution.
// 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"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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package org.apache.tapestry5.internal.plastic.asm.tree;

import java.util.Map;
import org.apache.tapestry5.internal.plastic.asm.Label;
import org.apache.tapestry5.internal.plastic.asm.MethodVisitor;

/** An {@link AbstractInsnNode} that encapsulates a {@link Label}. */
public class LabelNode extends AbstractInsnNode {

  private Label value;

  public LabelNode() {
    super(-1);
  }

  public LabelNode(final Label label) {
    super(-1);
    this.value = label;
  }

  @Override
  public int getType() {
    return LABEL;
  }

  /**
   * Returns the label encapsulated by this node. A new label is created and associated with this
   * node if it was created without an encapsulated label.
   *
   * @return the label encapsulated by this node.
   */
  public Label getLabel() {
    if (value == null) {
      value = new Label();
    }
    return value;
  }

  @Override
  public void accept(final MethodVisitor methodVisitor) {
    methodVisitor.visitLabel(getLabel());
  }

  @Override
  public AbstractInsnNode clone(final Map<LabelNode, LabelNode> clonedLabels) {
    return clonedLabels.get(this);
  }

  public void resetLabel() {
    value = null;
  }
}