package com.sun.org.apache.bcel.internal.generic;

/* ====================================================================
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2001 The Apache Software Foundation.  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.
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 *    notice, this list of conditions and the following disclaimer in
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 *    distribution.
 *
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 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Apache" and "Apache Software Foundation" and
 *    "Apache BCEL" must not be used to endorse or promote products
 *    derived from this software without prior written permission. For
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 *
 * 5. Products derived from this software may not be called "Apache",
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 *
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 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */
import com.sun.org.apache.bcel.internal.classfile.*;

/**
 * Super class for InvokeInstruction and FieldInstruction, since they have
 * some methods in common!
 *
 * @version $Id: FieldOrMethod.java,v 1.1.2.1 2005/07/31 23:46:00 jeffsuttor Exp $
 * @author  <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
 */
public abstract class FieldOrMethod extends CPInstruction implements LoadClass {
  /**
   * Empty constructor needed for the Class.newInstance() statement in
   * Instruction.readInstruction(). Not to be used otherwise.
   */
  FieldOrMethod() {}

  /**
   * @param index to constant pool
   */
  protected FieldOrMethod(short opcode, int index) {
    super(opcode, index);
  }

  /** @return signature of referenced method/field.
   */
  public String getSignature(ConstantPoolGen cpg) {
    ConstantPool        cp   = cpg.getConstantPool();
    ConstantCP          cmr  = (ConstantCP)cp.getConstant(index);
    ConstantNameAndType cnat = (ConstantNameAndType)cp.getConstant(cmr.getNameAndTypeIndex());

    return ((ConstantUtf8)cp.getConstant(cnat.getSignatureIndex())).getBytes();
  }

  /** @return name of referenced method/field.
   */
  public String getName(ConstantPoolGen cpg) {
    ConstantPool        cp   = cpg.getConstantPool();
    ConstantCP          cmr  = (ConstantCP)cp.getConstant(index);
    ConstantNameAndType cnat = (ConstantNameAndType)cp.getConstant(cmr.getNameAndTypeIndex());
    return ((ConstantUtf8)cp.getConstant(cnat.getNameIndex())).getBytes();
  }

  /** @return name of the referenced class/interface
   */
  public String getClassName(ConstantPoolGen cpg) {
    ConstantPool cp  = cpg.getConstantPool();
    ConstantCP   cmr = (ConstantCP)cp.getConstant(index);
    return cp.getConstantString(cmr.getClassIndex(), com.sun.org.apache.bcel.internal.Constants.CONSTANT_Class).replace('/', '.');
  }

  /** @return type of the referenced class/interface
   */
  public ObjectType getClassType(ConstantPoolGen cpg) {
    return new ObjectType(getClassName(cpg));
  }

  /** @return type of the referenced class/interface
   */
  public ObjectType getLoadClassType(ConstantPoolGen cpg) {
    return getClassType(cpg);
  }
}