| 1 | /* |
|---|---|
| 2 | * Copyright (C) 2007-2010 Júlio Vilmar Gesser. |
| 3 | * Copyright (C) 2011, 2013-2020 The JavaParser Team. |
| 4 | * |
| 5 | * This file is part of JavaParser. |
| 6 | * |
| 7 | * JavaParser can be used either under the terms of |
| 8 | * a) the GNU Lesser General Public License as published by |
| 9 | * the Free Software Foundation, either version 3 of the License, or |
| 10 | * (at your option) any later version. |
| 11 | * b) the terms of the Apache License |
| 12 | * |
| 13 | * You should have received a copy of both licenses in LICENCE.LGPL and |
| 14 | * LICENCE.APACHE. Please refer to those files for details. |
| 15 | * |
| 16 | * JavaParser is distributed in the hope that it will be useful, |
| 17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 19 | * GNU Lesser General Public License for more details. |
| 20 | */ |
| 21 | |
| 22 | package com.github.javaparser.resolution.types; |
| 23 | |
| 24 | import com.github.javaparser.resolution.declarations.ResolvedTypeParameterDeclaration; |
| 25 | |
| 26 | import java.util.List; |
| 27 | import java.util.Map; |
| 28 | |
| 29 | /** |
| 30 | * A wildcard can be: |
| 31 | * - unbounded (?) |
| 32 | * - have a lower bound (? super Number) |
| 33 | * - have an upper bound (? extends Number) |
| 34 | * It is not possible to have both a lower and an upper bound at the same time. |
| 35 | * |
| 36 | * @author Federico Tomassetti |
| 37 | */ |
| 38 | public class ResolvedWildcard implements ResolvedType { |
| 39 | |
| 40 | public static ResolvedWildcard UNBOUNDED = new ResolvedWildcard(null, null); |
| 41 | |
| 42 | private BoundType type; |
| 43 | private ResolvedType boundedType; |
| 44 | |
| 45 | private ResolvedWildcard(BoundType type, ResolvedType boundedType) { |
| 46 | if (type == null && boundedType != null) { |
| 47 | throw new IllegalArgumentException(); |
| 48 | } |
| 49 | if (type != null && boundedType == null) { |
| 50 | throw new IllegalArgumentException(); |
| 51 | } |
| 52 | this.type = type; |
| 53 | this.boundedType = boundedType; |
| 54 | } |
| 55 | |
| 56 | public static ResolvedWildcard superBound(ResolvedType type) { |
| 57 | return new ResolvedWildcard(BoundType.SUPER, type); |
| 58 | } |
| 59 | |
| 60 | public static ResolvedWildcard extendsBound(ResolvedType type) { |
| 61 | return new ResolvedWildcard(BoundType.EXTENDS, type); |
| 62 | } |
| 63 | |
| 64 | @Override |
| 65 | public String toString() { |
| 66 | return "WildcardUsage{" + |
| 67 | "type=" + type + |
| 68 | ", boundedType=" + boundedType + |
| 69 | '}'; |
| 70 | } |
| 71 | |
| 72 | public boolean isWildcard() { |
| 73 | return true; |
| 74 | } |
| 75 | |
| 76 | public ResolvedWildcard asWildcard() { |
| 77 | return this; |
| 78 | } |
| 79 | |
| 80 | @Override |
| 81 | public boolean equals(Object o) { |
| 82 | if (this == o) return true; |
| 83 | if (!(o instanceof ResolvedWildcard)) return false; |
| 84 | |
| 85 | ResolvedWildcard that = (ResolvedWildcard) o; |
| 86 | |
| 87 | if (boundedType != null ? !boundedType.equals(that.boundedType) : that.boundedType != null) return false; |
| 88 | if (type != that.type) return false; |
| 89 | |
| 90 | return true; |
| 91 | } |
| 92 | |
| 93 | @Override |
| 94 | public int hashCode() { |
| 95 | int result = type != null ? type.hashCode() : 0; |
| 96 | result = 31 * result + (boundedType != null ? boundedType.hashCode() : 0); |
| 97 | return result; |
| 98 | } |
| 99 | |
| 100 | @Override |
| 101 | public String describe() { |
| 102 | if (type == null) { |
| 103 | return "?"; |
| 104 | } else if (type == BoundType.SUPER) { |
| 105 | return "? super " + boundedType.describe(); |
| 106 | } else if (type == BoundType.EXTENDS) { |
| 107 | return "? extends " + boundedType.describe(); |
| 108 | } else { |
| 109 | throw new UnsupportedOperationException(); |
| 110 | } |
| 111 | } |
| 112 | |
| 113 | public boolean isSuper() { |
| 114 | return type == BoundType.SUPER; |
| 115 | } |
| 116 | |
| 117 | public boolean isExtends() { |
| 118 | return type == BoundType.EXTENDS; |
| 119 | } |
| 120 | |
| 121 | public boolean isBounded() { |
| 122 | return isSuper() || isExtends(); |
| 123 | } |
| 124 | |
| 125 | public ResolvedType getBoundedType() { |
| 126 | if (boundedType == null) { |
| 127 | throw new IllegalStateException(); |
| 128 | } |
| 129 | return boundedType; |
| 130 | } |
| 131 | |
| 132 | @Override |
| 133 | public boolean isAssignableBy(ResolvedType other) { |
| 134 | if (boundedType == null) { |
| 135 | //return other.isReferenceType() && other.asReferenceType().getQualifiedName().equals(Object.class.getCanonicalName()); |
| 136 | return false; |
| 137 | } else if (type == BoundType.SUPER) { |
| 138 | return boundedType.isAssignableBy(other); |
| 139 | } else if (type == BoundType.EXTENDS) { |
| 140 | return false; |
| 141 | } else { |
| 142 | throw new RuntimeException(); |
| 143 | } |
| 144 | } |
| 145 | |
| 146 | @Override |
| 147 | public ResolvedType replaceTypeVariables(ResolvedTypeParameterDeclaration tpToReplace, ResolvedType replaced, Map<ResolvedTypeParameterDeclaration, ResolvedType> inferredTypes) { |
| 148 | if (replaced == null) { |
| 149 | throw new IllegalArgumentException(); |
| 150 | } |
| 151 | if (boundedType == null) { |
| 152 | return this; |
| 153 | } |
| 154 | ResolvedType boundedTypeReplaced = boundedType.replaceTypeVariables(tpToReplace, replaced, inferredTypes); |
| 155 | if (boundedTypeReplaced == null) { |
| 156 | throw new RuntimeException(); |
| 157 | } |
| 158 | if (boundedTypeReplaced != boundedType) { |
| 159 | return new ResolvedWildcard(type, boundedTypeReplaced); |
| 160 | } else { |
| 161 | return this; |
| 162 | } |
| 163 | } |
| 164 | |
| 165 | @Override |
| 166 | public boolean mention(List<ResolvedTypeParameterDeclaration> typeParameters) { |
| 167 | return boundedType != null && boundedType.mention(typeParameters); |
| 168 | } |
| 169 | |
| 170 | public boolean isUpperBounded() { |
| 171 | return isSuper(); |
| 172 | } |
| 173 | |
| 174 | public boolean isLowerBounded() { |
| 175 | return isExtends(); |
| 176 | } |
| 177 | |
| 178 | public enum BoundType { |
| 179 | SUPER, |
| 180 | EXTENDS |
| 181 | } |
| 182 | |
| 183 | } |
| 184 |
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