signatureattribute.java

来自「RESIN 3.2 最新源码」· Java 代码 · 共 108 行

/*
 * Copyright (c) 1998-2008 Caucho Technology -- all rights reserved
 *
 * This file is part of Resin(R) Open Source
 *
 * Each copy or derived work must preserve the copyright notice and this
 * notice unmodified.
 *
 * Resin Open Source is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * Resin Open Source is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
 * of NON-INFRINGEMENT.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Resin Open Source; if not, write to the
 *   Free SoftwareFoundation, Inc.
 *   59 Temple Place, Suite 330
 *   Boston, MA 02111-1307  USA
 *
 * @author Scott Ferguson
 */

package com.caucho.bytecode;

import com.caucho.log.Log;

import java.io.IOException;
import java.util.logging.Logger;

/**
 * Represents a generic attribute
 */
public class SignatureAttribute extends Attribute {
  static private final Logger log = Log.open(SignatureAttribute.class);

  private String _signature;

  SignatureAttribute()
  {
    super("Signature");
  }

  SignatureAttribute(String signature)
  {
    super("Signature");

    _signature = signature;
  }

  /**
   * Returns the signature.
   */
  public String getSignature()
  {
    return _signature;
  }

  /**
   * Reads the signature.
   */
  public void read(ByteCodeParser in)
    throws IOException
  {
    int length = in.readInt();

    if (length != 2)
      throw new IOException("expected length of 2 at " + length);
    
    int code = in.readShort();
    _signature = in.getUTF8(code);
  }

  /**
   * Writes the field to the output.
   */
  public void write(ByteCodeWriter out)
    throws IOException
  {
    out.writeUTF8Const(getName());
    out.writeInt(2);
    out.writeUTF8Const(_signature);
  }

  /**
   * Clones the attribute
   */
  public Attribute export(JavaClass source, JavaClass target)
  {
    ConstantPool cp = target.getConstantPool();

    cp.addUTF8(getName());
    cp.addUTF8(_signature);
    
    return new SignatureAttribute(_signature);
  }

  public String toString()
  {
    return "SignatureAttribute[" + _signature + "]";
  }
}