alvinalexander.com | career | drupal | java | mac | mysql | perl | scala | uml | unix  

Java example source code file (ConstantCP.java)

This example Java source code file (ConstantCP.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

constantcp, datainputstream, ioexception, string

The ConstantCP.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.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    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
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * 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
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * 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 java.io.*;
import  com.sun.org.apache.bcel.internal.Constants;

/**
 * Abstract super class for Fieldref and Methodref constants.
 *
 * @author  <A HREF="mailto:markus.dahm@berlin.de">M. Dahm
 * @see     ConstantFieldref
 * @see     ConstantMethodref
 * @see     ConstantInterfaceMethodref
 */
public abstract class ConstantCP extends Constant {
  /** References to the constants containing the class and the field signature
   */
  protected int class_index, name_and_type_index;

  /**
   * Initialize from another object.
   */
  public ConstantCP(ConstantCP c) {
    this(c.getTag(), c.getClassIndex(), c.getNameAndTypeIndex());
  }

  /**
   * Initialize instance from file data.
   *
   * @param tag  Constant type tag
   * @param file Input stream
   * @throws IOException
   */
  ConstantCP(byte tag, DataInputStream file) throws IOException
  {
    this(tag, file.readUnsignedShort(), file.readUnsignedShort());
  }

  /**
   * @param class_index Reference to the class containing the field
   * @param name_and_type_index and the field signature
   */
  protected ConstantCP(byte tag, int class_index,
                       int name_and_type_index) {
    super(tag);
    this.class_index         = class_index;
    this.name_and_type_index = name_and_type_index;
  }

  /**
   * Dump constant field reference 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(class_index);
    file.writeShort(name_and_type_index);
  }

  /**
   * @return Reference (index) to class this field or method belongs to.
   */
  public final int getClassIndex()       { return class_index; }

  /**
   * @return Reference (index) to signature of the field.
   */
  public final int getNameAndTypeIndex() { return name_and_type_index; }

  /**
   * @param class_index points to Constant_class
   */
  public final void setClassIndex(int class_index) {
    this.class_index = class_index;
  }

  /**
   * @return Class this field belongs to.
   */
  public String getClass(ConstantPool cp) {
    return cp.constantToString(class_index, Constants.CONSTANT_Class);
  }

  /**
   * @param name_and_type_index points to Constant_NameAndType
   */
  public final void setNameAndTypeIndex(int name_and_type_index) {
    this.name_and_type_index = name_and_type_index;
  }

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

Other Java examples (source code examples)

Here is a short list of links related to this Java ConstantCP.java source code file:

... this post is sponsored by my books ...

#1 New Release!

FP Best Seller

 

new blog posts

 

Copyright 1998-2021 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.