// 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
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
// THE POSSIBILITY OF SUCH DAMAGE.
package org.objectweb.asm.tree;

import java.util.Map;
import org.objectweb.asm.Label;
import org.objectweb.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;
	}
}
