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Java example source code file (ConstantNameAndType.java)

This example Java source code file (ConstantNameAndType.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

constant, constantnameandtype, ioexception, string

The ConstantNameAndType.java Java example source code

/*
 * reserved comment block
 * DO NOT REMOVE OR ALTER!
 */
package com.sun.org.apache.bcel.internal.classfile;

/* ====================================================================
 * 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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 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    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
 *    written permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache",
 *    "Apache BCEL", nor may "Apache" appear in their name, without
 *    prior written permission of the Apache Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
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 * 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.Constants;
import  java.io.*;

/**
 * This class is derived from the abstract
 * <A HREF="com.sun.org.apache.bcel.internal.classfile.Constant.html">Constant class
 * and represents a reference to the name and signature
 * of a field or method.
 *
 * @author  <A HREF="mailto:markus.dahm@berlin.de">M. Dahm
 * @see     Constant
 */
public final class ConstantNameAndType extends Constant {
  private int name_index;      // Name of field/method
  private int signature_index; // and its signature.

  /**
   * Initialize from another object.
   */
  public ConstantNameAndType(ConstantNameAndType c) {
    this(c.getNameIndex(), c.getSignatureIndex());
  }

  /**
   * Initialize instance from file data.
   *
   * @param file Input stream
   * @throws IOException
   */
  ConstantNameAndType(DataInputStream file) throws IOException
  {
    this((int)file.readUnsignedShort(), (int)file.readUnsignedShort());
  }

  /**
   * @param name_index Name of field/method
   * @param signature_index and its signature
   */
  public ConstantNameAndType(int name_index,
                             int signature_index)
  {
    super(Constants.CONSTANT_NameAndType);
    this.name_index      = name_index;
    this.signature_index = signature_index;
  }

  /**
   * 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.visitConstantNameAndType(this);
  }

  /**
   * Dump name and signature index to file stream in binary format.
   *
   * @param file Output file stream
   * @throws IOException
   */
  public final void dump(DataOutputStream file) throws IOException
  {
    file.writeByte(tag);
    file.writeShort(name_index);
    file.writeShort(signature_index);
  }

  /**
   * @return Name index in constant pool of field/method name.
   */
  public final int getNameIndex()      { return name_index; }

  /** @return name
   */
  public final String getName(ConstantPool cp) {
    return cp.constantToString(getNameIndex(), Constants.CONSTANT_Utf8);
  }

  /**
   * @return Index in constant pool of field/method signature.
   */
  public final int getSignatureIndex() { return signature_index; }

  /** @return signature
   */
  public final String getSignature(ConstantPool cp) {
    return cp.constantToString(getSignatureIndex(), Constants.CONSTANT_Utf8);
  }

  /**
   * @param name_index.
   */
  public final void setNameIndex(int name_index) {
    this.name_index = name_index;
  }

  /**
   * @param signature_index.
   */
  public final void setSignatureIndex(int signature_index) {
    this.signature_index = signature_index;
  }

  /**
   * @return String representation
   */
  public final String toString() {
    return super.toString() + "(name_index = " + name_index +
      ", signature_index = " + signature_index + ")";
  }
}

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