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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
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//    notice, this list of conditions and the following disclaimer.
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//    this software without specific prior written permission.
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package scouter.org.objectweb.asm.commons;

import scouter.org.objectweb.asm.Attribute;
import scouter.org.objectweb.asm.ByteVector;
import scouter.org.objectweb.asm.ClassReader;
import scouter.org.objectweb.asm.ClassWriter;
import scouter.org.objectweb.asm.Label;

/**
 * A ModuleTarget attribute. This attribute is specific to the OpenJDK and may change in the future.
 *
 * @author Remi Forax
 */
public final class ModuleTargetAttribute extends Attribute {

  /** The name of the platform on which the module can run. */
  public String platform;

  /**
   * Constructs a new {@link ModuleTargetAttribute}.
   *
   * @param platform the name of the platform on which the module can run.
   */
  public ModuleTargetAttribute(final String platform) {
    super("ModuleTarget");
    this.platform = platform;
  }

  /**
   * Constructs an empty {@link ModuleTargetAttribute}. This object can be passed as a prototype to
   * the {@link ClassReader#accept(scouter.org.objectweb.asm.ClassVisitor, Attribute[], int)} method.
   */
  public ModuleTargetAttribute() {
    this(null);
  }

  @Override
  protected Attribute read(
      final ClassReader classReader,
      final int offset,
      final int length,
      final char[] charBuffer,
      final int codeOffset,
      final Label[] labels) {
    return new ModuleTargetAttribute(classReader.readUTF8(offset, charBuffer));
  }

  @Override
  protected ByteVector write(
      final ClassWriter classWriter,
      final byte[] code,
      final int codeLength,
      final int maxStack,
      final int maxLocals) {
    ByteVector byteVector = new ByteVector();
    byteVector.putShort(platform == null ? 0 : classWriter.newUTF8(platform));
    return byteVector;
  }
}