001/* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 * 017 */ 018package org.apache.bcel.generic; 019 020import org.apache.bcel.Const; 021 022/** 023 * Denotes array type, such as int[][] 024 * 025 * @version $Id: ArrayType.java 1749603 2016-06-21 20:50:19Z ggregory $ 026 */ 027public final class ArrayType extends ReferenceType { 028 029 private int dimensions; 030 private Type basic_type; 031 032 033 /** 034 * Convenience constructor for array type, e.g. int[] 035 * 036 * @param type array type, e.g. T_INT 037 */ 038 public ArrayType(final byte type, final int dimensions) { 039 this(BasicType.getType(type), dimensions); 040 } 041 042 043 /** 044 * Convenience constructor for reference array type, e.g. Object[] 045 * 046 * @param class_name complete name of class (java.lang.String, e.g.) 047 */ 048 public ArrayType(final String class_name, final int dimensions) { 049 this(ObjectType.getInstance(class_name), dimensions); 050 } 051 052 053 /** 054 * Constructor for array of given type 055 * 056 * @param type type of array (may be an array itself) 057 */ 058 public ArrayType(final Type type, final int dimensions) { 059 super(Const.T_ARRAY, "<dummy>"); 060 if ((dimensions < 1) || (dimensions > Const.MAX_BYTE)) { 061 throw new ClassGenException("Invalid number of dimensions: " + dimensions); 062 } 063 switch (type.getType()) { 064 case Const.T_ARRAY: 065 final ArrayType array = (ArrayType) type; 066 this.dimensions = dimensions + array.dimensions; 067 basic_type = array.basic_type; 068 break; 069 case Const.T_VOID: 070 throw new ClassGenException("Invalid type: void[]"); 071 default: // Basic type or reference 072 this.dimensions = dimensions; 073 basic_type = type; 074 break; 075 } 076 final StringBuilder buf = new StringBuilder(); 077 for (int i = 0; i < this.dimensions; i++) { 078 buf.append('['); 079 } 080 buf.append(basic_type.getSignature()); 081 super.setSignature(buf.toString()); 082 } 083 084 085 /** 086 * @return basic type of array, i.e., for int[][][] the basic type is int 087 */ 088 public Type getBasicType() { 089 return basic_type; 090 } 091 092 093 /** 094 * @return element type of array, i.e., for int[][][] the element type is int[][] 095 */ 096 public Type getElementType() { 097 if (dimensions == 1) { 098 return basic_type; 099 } 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}