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Rhino is an open-source implementation of JavaScript written entirely in Java. It is typically embedded into Java applications to provide scripting to end users.

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/* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

package org.mozilla.classfile;

final class ClassFileField
{
  ClassFileField(short nameIndex, short typeIndex, short flags)
  {
    itsNameIndex = nameIndex;
    itsTypeIndex = typeIndex;
    itsFlags = flags;
    itsHasAttributes = false;
  }

  void setAttributes(short attr1, short attr2, short attr3, int index)
  {
    itsHasAttributes = true;
    itsAttr1 = attr1;
    itsAttr2 = attr2;
    itsAttr3 = attr3;
    itsIndex = index;
  }

  int write(byte[] data, int offset)
  {
    offset = ClassFileWriter.putInt16(itsFlags, data, offset);
    offset = ClassFileWriter.putInt16(itsNameIndex, data, offset);
    offset = ClassFileWriter.putInt16(itsTypeIndex, data, offset);
    if (!itsHasAttributes) {
      // write 0 attributes
      offset = ClassFileWriter.putInt16(0, data, offset);
    } else {
      offset = ClassFileWriter.putInt16(1, data, offset);
      offset = ClassFileWriter.putInt16(itsAttr1, data, offset);
      offset = ClassFileWriter.putInt16(itsAttr2, data, offset);
      offset = ClassFileWriter.putInt16(itsAttr3, data, offset);
      offset = ClassFileWriter.putInt16(itsIndex, data, offset);
    }
    return offset;
  }

  int getWriteSize()
  {
    int size = 2 * 3;
    if (!itsHasAttributes) {
      size += 2;
    } else {
      size += 2 + 2 * 4;
    }
    return size;
  }

  private short itsNameIndex;
  private short itsTypeIndex;
  private short itsFlags;
  private boolean itsHasAttributes;
  private short itsAttr1, itsAttr2, itsAttr3;
  private int itsIndex;
}