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

import java.io.*;

/**
 * Class representing a class specification in the constant pool
 */

/*
   ConstString strictly speaking is not a ConstantValue in the
   Java VM sense.  However, the compiler generates ConstantValue attributes
   which refer to ConstString entries.  This occurs for initialized static
   final String fields.  I've changed ConstString to be a ConstValue for 
   now as a simplification.
*/

public class ConstString extends ConstValue {
  /* The tag associated with ConstClass entries */
  public static final int MyTag = CONSTANTString;

  /* The name of the class being referred to */
  private ConstUtf8 stringValue;

  /* The index of name of the class being referred to
   *  - used while reading from a class file */
  private int stringValueIndex;

  /* public accessors */

  /**
   * Return the tag for this constant
   */
  public int tag () { return MyTag; }

  /**
   * Return the utf8 string calue
   */
  public ConstUtf8 value() {
    return stringValue;
  }

  /**
   * Return the descriptor string for the constant type.
   */
  public String descriptor() {
      return "Ljava/lang/String;";//NOI18N
  }

  /**
   * A printable representation 
   */
  public String toString () {
      return "CONSTANTString(" + indexAsString() + "): " + //NOI18N
          "string(" + stringValue.asString() + ")";//NOI18N
  }

  /* package local methods */

  ConstString (ConstUtf8 s) {
    stringValue = s;
  }

  ConstString (int sIndex) {
    stringValueIndex = sIndex;
  }

  void formatData (DataOutputStream b) throws IOException {
    b.writeShort (stringValue.getIndex());
  }
  static ConstString read (DataInputStream input) throws IOException {
    return new ConstString (input.readUnsignedShort());
  }
  void resolve (ConstantPool p) {
    stringValue = (ConstUtf8) p.constantAt(stringValueIndex);
  }
}