// 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.
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//    contributors may be used to endorse or promote products derived from
//    this software without specific prior written permission.
//
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package org.apache.tapestry5.internal.plastic.asm.commons;

import org.apache.tapestry5.internal.plastic.asm.Attribute;
import org.apache.tapestry5.internal.plastic.asm.ByteVector;
import org.apache.tapestry5.internal.plastic.asm.ClassReader;
import org.apache.tapestry5.internal.plastic.asm.ClassWriter;
import org.apache.tapestry5.internal.plastic.asm.Label;

/**
 * A ModuleResolution attribute. This attribute is specific to the OpenJDK and may change in the
 * future.
 *
 * @author Remi Forax
 */
public final class ModuleResolutionAttribute extends Attribute {
  /**
   * The resolution state of a module meaning that the module is not available from the class-path
   * by default.
   */
  public static final int RESOLUTION_DO_NOT_RESOLVE_BY_DEFAULT = 1;

  /** The resolution state of a module meaning the module is marked as deprecated. */
  public static final int RESOLUTION_WARN_DEPRECATED = 2;

  /**
   * The resolution state of a module meaning the module is marked as deprecated and will be removed
   * in a future release.
   */
  public static final int RESOLUTION_WARN_DEPRECATED_FOR_REMOVAL = 4;

  /**
   * The resolution state of a module meaning the module is not yet standardized, so in incubating
   * mode.
   */
  public static final int RESOLUTION_WARN_INCUBATING = 8;

  /**
   * The resolution state of the module. Must be one of {@link #RESOLUTION_WARN_DEPRECATED}, {@link
   * #RESOLUTION_WARN_DEPRECATED_FOR_REMOVAL}, and {@link #RESOLUTION_WARN_INCUBATING}.
   */
  public int resolution;

  /**
   * Constructs a new {@link ModuleResolutionAttribute}.
   *
   * @param resolution the resolution state of the module. Must be one of {@link
   *     #RESOLUTION_WARN_DEPRECATED}, {@link #RESOLUTION_WARN_DEPRECATED_FOR_REMOVAL}, and {@link
   *     #RESOLUTION_WARN_INCUBATING}.
   */
  public ModuleResolutionAttribute(final int resolution) {
    super("ModuleResolution");
    this.resolution = resolution;
  }

  /**
   * Constructs an empty {@link ModuleResolutionAttribute}. This object can be passed as a prototype
   * to the {@link ClassReader#accept(org.apache.tapestry5.internal.plastic.asm.ClassVisitor, Attribute[], int)} method.
   */
  public ModuleResolutionAttribute() {
    this(0);
  }

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

  @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(resolution);
    return byteVector;
  }
}
