org.objectweb.asm.tree.LabelNode.java Source code

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Here is the source code for org.objectweb.asm.tree.LabelNode.java

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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
// 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;
    }
}