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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.mvel2.asm.commons;

import org.mvel2.asm.Attribute;
import org.mvel2.asm.ByteVector;
import org.mvel2.asm.ClassReader;
import org.mvel2.asm.ClassWriter;
import org.mvel2.asm.Label;

/**
 * ModuleTarget attribute.
 * This attribute is specific to the OpenJDK and may change in the future.
 * 
 * @author Remi Forax
 */
public final class ModuleTargetAttribute extends Attribute {
    public String platform;
    
    /**
     * Creates an attribute with a platform name.
     * @param platform the platform name on which the module can run.
     */
    public ModuleTargetAttribute(final String platform) {
        super("ModuleTarget");
        this.platform = platform;
    }
    
    /**
     * Creates an empty attribute that can be used as prototype
     * to be passed as argument of the method
     * {@link ClassReader#accept(org.objectweb.asm.ClassVisitor, Attribute[], int)}.
     */
    public ModuleTargetAttribute() {
        this(null);
    }
    
    @Override
    protected Attribute read(ClassReader cr, int off, int len, char[] buf,
            int codeOff, Label[] labels) {
        String platform = cr.readUTF8(off, buf);
        return new ModuleTargetAttribute(platform);
    }
    
    @Override
    protected ByteVector write(ClassWriter cw, byte[] code, int len,
            int maxStack, int maxLocals) {
        ByteVector v = new ByteVector();
        int index = (platform == null)? 0: cw.newUTF8(platform);
        v.putShort(index);
        return v;
    }
}