1 /*
2 * reserved comment block
3 * DO NOT REMOVE OR ALTER!
4 */
5 package com.sun.org.apache.bcel.internal.generic;
6
7 /* ====================================================================
8 * The Apache Software License, Version 1.1
9 *
10 * Copyright (c) 2001 The Apache Software Foundation. All rights
11 * reserved.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 *
17 * 1. Redistributions of source code must retain the above copyright
18 * notice, this list of conditions and the following disclaimer.
19 *
20 * 2. Redistributions in binary form must reproduce the above copyright
21 * notice, this list of conditions and the following disclaimer in
22 * the documentation and/or other materials provided with the
23 * distribution.
24 *
25 * 3. The end-user documentation included with the redistribution,
26 * if any, must include the following acknowledgment:
27 * "This product includes software developed by the
28 * Apache Software Foundation (http://www.apache.org/)."
29 * Alternately, this acknowledgment may appear in the software itself,
30 * if and wherever such third-party acknowledgments normally appear.
31 *
32 * 4. The names "Apache" and "Apache Software Foundation" and
33 * "Apache BCEL" must not be used to endorse or promote products
34 * derived from this software without prior written permission. For
35 * written permission, please contact apache@apache.org.
36 *
37 * 5. Products derived from this software may not be called "Apache",
38 * "Apache BCEL", nor may "Apache" appear in their name, without
39 * prior written permission of the Apache Software Foundation.
40 *
41 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
42 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
43 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
44 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
45 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
46 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
47 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
48 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
49 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
50 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
51 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
52 * SUCH DAMAGE.
53 * ====================================================================
54 *
55 * This software consists of voluntary contributions made by many
56 * individuals on behalf of the Apache Software Foundation. For more
57 * information on the Apache Software Foundation, please see
58 * <http://www.apache.org/>.
59 */
60 import com.sun.org.apache.bcel.internal.Constants;
61
62 /**
63 * Denotes array type, such as int[][]
64 *
65 * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
66 */
67 public final class ArrayType extends ReferenceType {
68 private int dimensions;
69 private Type basic_type;
70
71 /**
72 * Convenience constructor for array type, e.g. int[]
73 *
74 * @param type array type, e.g. T_INT
75 */
76 public ArrayType(byte type, int dimensions) {
77 this(BasicType.getType(type), dimensions);
78 }
79
80 /**
81 * Convenience constructor for reference array type, e.g. Object[]
82 *
83 * @param class_name complete name of class (java.lang.String, e.g.)
84 */
85 public ArrayType(String class_name, int dimensions) {
86 this(new ObjectType(class_name), dimensions);
87 }
88
89 /**
90 * Constructor for array of given type
91 *
92 * @param type type of array (may be an array itself)
93 */
94 public ArrayType(Type type, int dimensions) {
95 super(Constants.T_ARRAY, "<dummy>");
96
97 if((dimensions < 1) || (dimensions > Constants.MAX_BYTE))
98 throw new ClassGenException("Invalid number of dimensions: " + dimensions);
99
100 switch(type.getType()) {
101 case Constants.T_ARRAY:
102 ArrayType array = (ArrayType)type;
103 this.dimensions = dimensions + array.dimensions;
104 basic_type = array.basic_type;
105 break;
106
107 case Constants.T_VOID:
108 throw new ClassGenException("Invalid type: void[]");
109
110 default: // Basic type or reference
111 this.dimensions = dimensions;
112 basic_type = type;
113 break;
114 }
115
116 StringBuffer buf = new StringBuffer();
117 for(int i=0; i < this.dimensions; i++)
118 buf.append('[');
119
120 buf.append(basic_type.getSignature());
121
122 signature = buf.toString();
123 }
124
125 /**
126 * @return basic type of array, i.e., for int[][][] the basic type is int
127 */
128 public Type getBasicType() {
129 return basic_type;
130 }
131
132 /**
133 * @return element type of array, i.e., for int[][][] the element type is int[][]
134 */
135 public Type getElementType() {
136 if(dimensions == 1)
137 return basic_type;
138 else
139 return new ArrayType(basic_type, dimensions - 1);
140 }
141
142 /** @return number of dimensions of array
143 */
144 public int getDimensions() { return dimensions; }
145
146 /** @return a hash code value for the object.
147 */
148 public int hashCode() { return basic_type.hashCode() ^ dimensions; }
149
150 /** @return true if both type objects refer to the same array type.
151 */
152 public boolean equals(Object type) {
153 if(type instanceof ArrayType) {
154 ArrayType array = (ArrayType)type;
155 return (array.dimensions == dimensions) && array.basic_type.equals(basic_type);
156 } else
157 return false;
158 }
159 }