1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one or more 3 * contributor license agreements. See the NOTICE file distributed with 4 * this work for additional information regarding copyright ownership. 5 * The ASF licenses this file to You under the Apache License, Version 2.0 6 * (the "License"); you may not use this file except in compliance with 7 * the License. You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 * 17 */ 18 package org.apache.bcel.generic; 19 20 import org.apache.bcel.Const; 21 22 /** 23 * Denotes array type, such as int[][] 24 * 25 * @version $Id$ 26 */ 27 public final class ArrayType extends ReferenceType { 28 29 private int dimensions; 30 private Type basic_type; 31 32 33 /** 34 * Convenience constructor for array type, e.g. int[] 35 * 36 * @param type array type, e.g. T_INT 37 */ 38 public ArrayType(final byte type, final int dimensions) { 39 this(BasicType.getType(type), dimensions); 40 } 41 42 43 /** 44 * Convenience constructor for reference array type, e.g. Object[] 45 * 46 * @param class_name complete name of class (java.lang.String, e.g.) 47 */ 48 public ArrayType(final String class_name, final int dimensions) { 49 this(ObjectType.getInstance(class_name), dimensions); 50 } 51 52 53 /** 54 * Constructor for array of given type 55 * 56 * @param type type of array (may be an array itself) 57 */ 58 public ArrayType(final Type type, final int dimensions) { 59 super(Const.T_ARRAY, "<dummy>"); 60 if ((dimensions < 1) || (dimensions > Const.MAX_BYTE)) { 61 throw new ClassGenException("Invalid number of dimensions: " + dimensions); 62 } 63 switch (type.getType()) { 64 case Const.T_ARRAY: 65 final ArrayType array = (ArrayType) type; 66 this.dimensions = dimensions + array.dimensions; 67 basic_type = array.basic_type; 68 break; 69 case Const.T_VOID: 70 throw new ClassGenException("Invalid type: void[]"); 71 default: // Basic type or reference 72 this.dimensions = dimensions; 73 basic_type = type; 74 break; 75 } 76 final StringBuilder buf = new StringBuilder(); 77 for (int i = 0; i < this.dimensions; i++) { 78 buf.append('['); 79 } 80 buf.append(basic_type.getSignature()); 81 super.setSignature(buf.toString()); 82 } 83 84 85 /** 86 * @return basic type of array, i.e., for int[][][] the basic type is int 87 */ 88 public Type getBasicType() { 89 return basic_type; 90 } 91 92 93 /** 94 * @return element type of array, i.e., for int[][][] the element type is int[][] 95 */ 96 public Type getElementType() { 97 if (dimensions == 1) { 98 return basic_type; 99 } 100 return new ArrayType(basic_type, dimensions - 1); 101 } 102 103 104 /** @return number of dimensions of array 105 */ 106 public int getDimensions() { 107 return dimensions; 108 } 109 110 111 /** @return a hash code value for the object. 112 */ 113 @Override 114 public int hashCode() { 115 return basic_type.hashCode() ^ dimensions; 116 } 117 118 119 /** @return true if both type objects refer to the same array type. 120 */ 121 @Override 122 public boolean equals( final Object _type ) { 123 if (_type instanceof ArrayType) { 124 final ArrayType array = (ArrayType) _type; 125 return (array.dimensions == dimensions) && array.basic_type.equals(basic_type); 126 } 127 return false; 128 } 129 } 130