001// ASM: a very small and fast Java bytecode manipulation framework
002// Copyright (c) 2000-2011 INRIA, France Telecom
003// All rights reserved.
004//
005// Redistribution and use in source and binary forms, with or without
006// modification, are permitted provided that the following conditions
007// are met:
008// 1. Redistributions of source code must retain the above copyright
009//    notice, this list of conditions and the following disclaimer.
010// 2. Redistributions in binary form must reproduce the above copyright
011//    notice, this list of conditions and the following disclaimer in the
012//    documentation and/or other materials provided with the distribution.
013// 3. Neither the name of the copyright holders nor the names of its
014//    contributors may be used to endorse or promote products derived from
015//    this software without specific prior written permission.
016//
017// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
018// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
019// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
020// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
021// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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023// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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028
029package io.ebean.enhance.asm.commons;
030
031import io.ebean.enhance.asm.*;
032import io.ebean.enhance.asm.ByteVector;
033
034/**
035 * A ModuleTarget attribute. This attribute is specific to the OpenJDK and may change in the future.
036 *
037 * @author Remi Forax
038 */
039public final class ModuleTargetAttribute extends Attribute {
040
041  /** The name of the platform on which the module can run. */
042  public String platform;
043
044  /**
045   * Constructs a new {@link ModuleTargetAttribute}.
046   *
047   * @param platform the name of the platform on which the module can run.
048   */
049  public ModuleTargetAttribute(final String platform) {
050    super("ModuleTarget");
051    this.platform = platform;
052  }
053
054  /**
055   * Constructs an empty {@link ModuleTargetAttribute}. This object can be passed as a prototype to
056   * the {@link ClassReader#accept(ClassVisitor, Attribute[], int)} method.
057   */
058  public ModuleTargetAttribute() {
059    this(null);
060  }
061
062  @Override
063  protected Attribute read(
064      final ClassReader classReader,
065      final int offset,
066      final int length,
067      final char[] charBuffer,
068      final int codeOffset,
069      final Label[] labels) {
070    return new ModuleTargetAttribute(classReader.readUTF8(offset, charBuffer));
071  }
072
073  @Override
074  protected ByteVector write(
075      final ClassWriter classWriter,
076      final byte[] code,
077      final int codeLength,
078      final int maxStack,
079      final int maxLocals) {
080    ByteVector byteVector = new ByteVector();
081    byteVector.putShort(platform == null ? 0 : classWriter.newUTF8(platform));
082    return byteVector;
083  }
084}