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Java example source code file (ArrayType.java)

This example Java source code file (ArrayType.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

arraytype, basic, classgenexception, invalid, objecttype, referencetype, stringbuffer, type

The ArrayType.java Java example source code

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

/* ====================================================================
 * 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 com.sun.org.apache.bcel.internal.Constants;

/**
 * Denotes array type, such as int[][]
 *
 * @author  <A HREF="mailto:markus.dahm@berlin.de">M. Dahm
 */
public final class ArrayType extends ReferenceType {
  private int  dimensions;
  private Type basic_type;

  /**
   * Convenience constructor for array type, e.g. int[]
   *
   * @param type array type, e.g. T_INT
   */
  public ArrayType(byte type, int dimensions) {
    this(BasicType.getType(type), dimensions);
  }

  /**
   * Convenience constructor for reference array type, e.g. Object[]
   *
   * @param class_name complete name of class (java.lang.String, e.g.)
   */
  public ArrayType(String class_name, int dimensions) {
    this(new ObjectType(class_name), dimensions);
  }

  /**
   * Constructor for array of given type
   *
   * @param type type of array (may be an array itself)
   */
  public ArrayType(Type type, int dimensions) {
    super(Constants.T_ARRAY, "<dummy>");

    if((dimensions < 1) || (dimensions > Constants.MAX_BYTE))
      throw new ClassGenException("Invalid number of dimensions: " + dimensions);

    switch(type.getType()) {
    case Constants.T_ARRAY:
      ArrayType array = (ArrayType)type;
      this.dimensions = dimensions + array.dimensions;
      basic_type      = array.basic_type;
      break;

    case Constants.T_VOID:
      throw new ClassGenException("Invalid type: void[]");

    default: // Basic type or reference
      this.dimensions = dimensions;
      basic_type = type;
      break;
    }

    StringBuffer buf = new StringBuffer();
    for(int i=0; i < this.dimensions; i++)
      buf.append('[');

    buf.append(basic_type.getSignature());

    signature = buf.toString();
  }

  /**
   * @return basic type of array, i.e., for int[][][] the basic type is int
   */
  public Type getBasicType() {
    return basic_type;
  }

  /**
   * @return element type of array, i.e., for int[][][] the element type is int[][]
   */
  public Type getElementType() {
    if(dimensions == 1)
      return basic_type;
    else
      return new ArrayType(basic_type, dimensions - 1);
  }

  /** @return number of dimensions of array
   */
  public int getDimensions() { return dimensions; }

  /** @return a hash code value for the object.
   */
  public int hashCode() { return basic_type.hashCode() ^ dimensions; }

  /** @return true if both type objects refer to the same array type.
   */
  public boolean equals(Object type) {
    if(type instanceof ArrayType) {
      ArrayType array = (ArrayType)type;
      return (array.dimensions == dimensions) && array.basic_type.equals(basic_type);
    } else
      return false;
  }
}

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