package de.fub.bytecode.classfile;

import  de.fub.bytecode.Constants;
import  java.io.*;

/** 
 * This class is derived from the abstract 
 * <A HREF="de.fub.bytecode.classfile.Constant.html">Constant</A> class 
 * and represents a reference to a Utf8 encoded string.
 *
 * @version $Id: ConstantUtf8.java,v 1.3 2001/05/09 09:26:57 dahm Exp $
 * @author  <A HREF="http://www.berlin.de/~markus.dahm/">M. Dahm</A>
 * @see     Constant
 */
public final class ConstantUtf8 extends Constant {
  private String bytes;
  
  /**
   * Initialize from another object.
   */
  public ConstantUtf8(ConstantUtf8 c) {
    this(c.getBytes());
  }    
  
  /**
   * Initialize instance from file data.
   *
   * @param file Input stream
   * @throw IOException
   */
  ConstantUtf8(DataInputStream file) throws IOException
  {    
    super(Constants.CONSTANT_Utf8);

    bytes = file.readUTF();
  }    

  /**
   * @param bytes Data
   */
  public ConstantUtf8(String bytes)
  {
    super(Constants.CONSTANT_Utf8);
    this.bytes  = bytes;
  }    

  /**
   * Called by objects that are traversing the nodes of the tree implicitely
   * defined by the contents of a Java class. I.e., the hierarchy of methods,
   * fields, attributes, etc. spawns a tree of objects.
   *
   * @param v Visitor object
   */
  public void accept(Visitor v) {
    v.visitConstantUtf8(this);
  }

  /**
   * Dump String in Utf8 format to file stream.
   *
   * @param file Output file stream
   * @throw IOException
   */ 
  public final void dump(DataOutputStream file) throws IOException
  {
    file.writeByte(tag);
    file.writeUTF(bytes);
  }

  /**
   * @return Data converted to string.
   */  
  public final String getBytes() { return bytes; }    

  /**
   * @param bytes.
   */
  public final void setBytes(String bytes) {
    this.bytes = bytes;
  }    

  /**
   * @return String representation
   */
  public final String toString()
  {
    return super.toString() + "(\"" + Utility.replace(bytes, "\n", "\\n") + "\")";
  }    
}