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package com.sun.jdo.api.persistence.enhancer.classfile;

import java.io.*;

/**
 * Class representing a name and an associated type in the constant pool
 * of a class file
 */

public class ConstNameAndType extends ConstBasic {
  /* The tag value associated with ConstDouble */
  public static final int MyTag = CONSTANTNameAndType;

  /* The name of interest */
  private ConstUtf8 theName;

  /* The index of the name to be resolved
   *   - used during class file reading */
  private int theNameIndex;

  /* The type signature associated with the name */
  private ConstUtf8 typeSignature;

  /* The index of the signature to be resolved
   *   - used during class file reading */
  private int typeSignatureIndex;

  /* public accessors */

  /**
   * The tag of this constant entry
   */
  public int tag () { return MyTag; }

  /**
   * Return the name
   */
  public ConstUtf8 name() {
    return theName;
  }

  /**
   * Return the type signature associated with the name
   */
  public ConstUtf8 signature() {
    return typeSignature;
  }

  /**
   * Modify the signature
   */
  public void changeSignature(ConstUtf8 newSig) {
    typeSignature = newSig;
  }

  /**
   * A printable representation
   */
  public String toString () {
      return "CONSTANTNameAndType(" + indexAsString() + "): " + //NOI18N
          "name(" + theName.toString() + ") " +//NOI18N
          " type(" + typeSignature.toString() + ")";//NOI18N
  }

  /* package local methods */

  ConstNameAndType (ConstUtf8 n, ConstUtf8 sig) {
    theName = n; typeSignature = sig;
  }

  ConstNameAndType (int n, int sig) {
    theNameIndex = n; typeSignatureIndex = sig;
  }

  void formatData (DataOutputStream b) throws IOException {
    b.writeShort(theName.getIndex());
    b.writeShort(typeSignature.getIndex());
  }

  static ConstNameAndType read (DataInputStream input) throws IOException {
    int cname = input.readUnsignedShort();
    int sig = input.readUnsignedShort();

    return new ConstNameAndType (cname, sig);
  }

  void resolve (ConstantPool p) {
    theName = (ConstUtf8) p.constantAt(theNameIndex);
    typeSignature = (ConstUtf8) p.constantAt(typeSignatureIndex);
  }
}