1   package org.apache.bcel.generic;
2   
3   /* ====================================================================
4    * The Apache Software License, Version 1.1
5    *
6    * Copyright (c) 2001 The Apache Software Foundation.  All rights
7    * reserved.
8    *
9    * Redistribution and use in source and binary forms, with or without
10   * modification, are permitted provided that the following conditions
11   * are met:
12   *
13   * 1. Redistributions of source code must retain the above copyright
14   *    notice, this list of conditions and the following disclaimer.
15   *
16   * 2. Redistributions in binary form must reproduce the above copyright
17   *    notice, this list of conditions and the following disclaimer in
18   *    the documentation and/or other materials provided with the
19   *    distribution.
20   *
21   * 3. The end-user documentation included with the redistribution,
22   *    if any, must include the following acknowledgment:
23   *       "This product includes software developed by the
24   *        Apache Software Foundation (http://www.apache.org/)."
25   *    Alternately, this acknowledgment may appear in the software itself,
26   *    if and wherever such third-party acknowledgments normally appear.
27   *
28   * 4. The names "Apache" and "Apache Software Foundation" and
29   *    "Apache BCEL" must not be used to endorse or promote products
30   *    derived from this software without prior written permission. For
31   *    written permission, please contact apache@apache.org.
32   *
33   * 5. Products derived from this software may not be called "Apache",
34   *    "Apache BCEL", nor may "Apache" appear in their name, without
35   *    prior written permission of the Apache Software Foundation.
36   *
37   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
38   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
39   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
40   * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
41   * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
42   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
43   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
44   * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
45   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
46   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
47   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
48   * SUCH DAMAGE.
49   * ====================================================================
50   *
51   * This software consists of voluntary contributions made by many
52   * individuals on behalf of the Apache Software Foundation.  For more
53   * information on the Apache Software Foundation, please see
54   * <http://www.apache.org/>.
55   */
56  import org.apache.bcel.Constants;
57  
58  /*** 
59   * Denotes array type, such as int[][]
60   *
61   * @version $Id: ArrayType.java,v 1.1.1.1 2001/10/29 20:00:06 jvanzyl Exp $
62   * @author  <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
63   */
64  public final class ArrayType extends ReferenceType {
65    private int  dimensions;
66    private Type basic_type;
67  
68    /***
69     * Convenience constructor for array type, e.g. int[]
70     *
71     * @param type array type, e.g. T_INT
72     */ 
73    public ArrayType(byte type, int dimensions) {
74      this(BasicType.getType(type), dimensions);
75    }
76  
77    /***
78     * Convenience constructor for reference array type, e.g. Object[]
79     *
80     * @param class_name complete name of class (java.lang.String, e.g.)
81     */ 
82    public ArrayType(String class_name, int dimensions) {
83      this(new ObjectType(class_name), dimensions);
84    }
85  
86    /***
87     * Constructor for array of given type
88     *
89     * @param type type of array (may be an array itself)
90     */ 
91    public ArrayType(Type type, int dimensions) {
92      super(Constants.T_ARRAY, "<dummy>");
93  
94      if((dimensions < 1) || (dimensions > Constants.MAX_BYTE))
95        throw new ClassGenException("Invalid number of dimensions: " + dimensions);
96  
97      switch(type.getType()) {
98      case Constants.T_ARRAY:
99        ArrayType array = (ArrayType)type;
100       this.dimensions = dimensions + array.dimensions;
101       basic_type      = array.basic_type;
102       break;
103       
104     case Constants.T_VOID:
105       throw new ClassGenException("Invalid type: void[]");
106 
107     default: // Basic type or reference
108       this.dimensions = dimensions;
109       basic_type = type;
110       break;
111     }
112 
113     StringBuffer buf = new StringBuffer();
114     for(int i=0; i < this.dimensions; i++)
115       buf.append('[');
116 
117     buf.append(basic_type.getSignature());
118 
119     signature = buf.toString();
120   }
121 
122   /***
123    * @return basic type of array, i.e., for int[][][] the basic type is int
124    */
125   public Type getBasicType() {
126     return basic_type;
127   }
128 
129   /***
130    * @return element type of array, i.e., for int[][][] the element type is int[][]
131    */
132   public Type getElementType() {
133     if(dimensions == 1)
134       return basic_type;
135     else
136       return new ArrayType(basic_type, dimensions - 1);
137   }
138 
139   /*** @return number of dimensions of array
140    */
141   public int getDimensions() { return dimensions; }
142 
143   /*** @return a hash code value for the object.
144    */
145   public int hashcode() { return basic_type.hashCode() ^ dimensions; }
146 
147   /*** @return true if both type objects refer to the same array type.
148    */
149   public boolean equals(Object type) {
150     if(type instanceof ArrayType) {
151       ArrayType array = (ArrayType)type;
152       return (array.dimensions == dimensions) && array.basic_type.equals(basic_type);
153     } else
154       return false;
155   }
156 }
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