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| 1 | /* | ||
| 2 | * Copyright (c) 2003, 2004, Oracle and/or its affiliates. All rights reserved. | ||
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | ||
| 4 | * | ||
| 5 | * This code is free software; you can redistribute it and/or modify it | ||
| 6 | * under the terms of the GNU General Public License version 2 only, as | ||
| 7 | * published by the Free Software Foundation. Oracle designates this | ||
| 8 | * particular file as subject to the "Classpath" exception as provided | ||
| 9 | * by Oracle in the LICENSE file that accompanied this code. | ||
| 10 | * | ||
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT | ||
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | ||
| 14 | * version 2 for more details (a copy is included in the LICENSE file that | ||
| 15 | * accompanied this code). | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU General Public License version | ||
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, | ||
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | ||
| 20 | * | ||
| 21 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
| 22 | * or visit www.oracle.com if you need additional information or have any | ||
| 23 | * questions. | ||
| 24 | */ | ||
| 25 | |||
| 26 | package sun.reflect.generics.reflectiveObjects; | ||
| 27 | |||
| 28 | import java.lang.reflect.GenericDeclaration; | ||
| 29 | import java.lang.reflect.Type; | ||
| 30 | import java.lang.reflect.TypeVariable; | ||
| 31 | |||
| 32 | import sun.reflect.generics.factory.GenericsFactory; | ||
| 33 | import sun.reflect.generics.tree.FieldTypeSignature; | ||
| 34 | import sun.reflect.generics.visitor.Reifier; | ||
| 35 | |||
| 36 | /** | ||
| 37 | * Implementation of <tt>java.lang.reflect.TypeVariable</tt> interface | ||
| 38 | * for core reflection. | ||
| 39 | */ | ||
| 40 | public class TypeVariableImpl<D extends GenericDeclaration> | ||
| 41 | extends LazyReflectiveObjectGenerator implements TypeVariable<D> { | ||
| 42 | D genericDeclaration; | ||
| 43 | private String name; | ||
| 44 | // upper bounds - evaluated lazily | ||
| 45 | private Type[] bounds; | ||
| 46 | |||
| 47 | // The ASTs for the bounds. We are required to evaluate the bounds | ||
| 48 | // lazily, so we store these at least until we are first asked | ||
| 49 | // for the bounds. This also neatly solves the | ||
| 50 | // problem with F-bounds - you can't reify them before the formal | ||
| 51 | // is defined. | ||
| 52 | private FieldTypeSignature[] boundASTs; | ||
| 53 | |||
| 54 | // constructor is private to enforce access through static factory | ||
| 55 | private TypeVariableImpl(D decl, String n, FieldTypeSignature[] bs, | ||
| 56 | GenericsFactory f) { | ||
| 57 | super(f); | ||
| 58 | genericDeclaration = decl; | ||
| 59 | name = n; | ||
| 60 | boundASTs = bs; | ||
| 61 | } | ||
| 62 | |||
| 63 | // Accessors | ||
| 64 | |||
| 65 | // accessor for ASTs for bounds. Must not be called after | ||
| 66 | // bounds have been evaluated, because we might throw the ASTs | ||
| 67 | // away (but that is not thread-safe, is it?) | ||
| 68 | private FieldTypeSignature[] getBoundASTs() { | ||
| 69 | // check that bounds were not evaluated yet | ||
| 70 | assert(bounds == null); | ||
| 71 | return boundASTs; | ||
| 72 | } | ||
| 73 | |||
| 74 | /** | ||
| 75 | * Factory method. | ||
| 76 | * @param decl - the reflective object that declared the type variable | ||
| 77 | * that this method should create | ||
| 78 | * @param name - the name of the type variable to be returned | ||
| 79 | * @param bs - an array of ASTs representing the bounds for the type | ||
| 80 | * variable to be created | ||
| 81 | * @param f - a factory that can be used to manufacture reflective | ||
| 82 | * objects that represent the bounds of this type variable | ||
| 83 | * @return A type variable with name, bounds, declaration and factory | ||
| 84 | * specified | ||
| 85 | */ | ||
| 86 | public static <T extends GenericDeclaration> | ||
| 87 | TypeVariableImpl<T> make(T decl, String name, | ||
| 88 | FieldTypeSignature[] bs, | ||
| 89 | GenericsFactory f) { | ||
| 90 | return new TypeVariableImpl<T>(decl, name, bs, f); | ||
| 91 | } | ||
| 92 | |||
| 93 | |||
| 94 | /** | ||
| 95 | * Returns an array of <tt>Type</tt> objects representing the | ||
| 96 | * upper bound(s) of this type variable. Note that if no upper bound is | ||
| 97 | * explicitly declared, the upper bound is <tt>Object</tt>. | ||
| 98 | * | ||
| 99 | * <p>For each upper bound B: | ||
| 100 | * <ul> | ||
| 101 | * <li>if B is a parameterized type or a type variable, it is created, | ||
| 102 | * (see {@link #ParameterizedType} for the details of the creation | ||
| 103 | * process for parameterized types). | ||
| 104 | * <li>Otherwise, B is resolved. | ||
| 105 | * </ul> | ||
| 106 | * | ||
| 107 | * @throws <tt>TypeNotPresentException</tt> if any of the | ||
| 108 | * bounds refers to a non-existent type declaration | ||
| 109 | * @throws <tt>MalformedParameterizedTypeException</tt> if any of the | ||
| 110 | * bounds refer to a parameterized type that cannot be instantiated | ||
| 111 | * for any reason | ||
| 112 | * @return an array of Types representing the upper bound(s) of this | ||
| 113 | * type variable | ||
| 114 | */ | ||
| 115 | public Type[] getBounds() { | ||
| 116 | // lazily initialize bounds if necessary | ||
| 117 | if (bounds == null) { | ||
| 118 | FieldTypeSignature[] fts = getBoundASTs(); // get AST | ||
| 119 | // allocate result array; note that | ||
| 120 | // keeping ts and bounds separate helps with threads | ||
| 121 | Type[] ts = new Type[fts.length]; | ||
| 122 | // iterate over bound trees, reifying each in turn | ||
| 123 | for ( int j = 0; j < fts.length; j++) { | ||
| 124 | Reifier r = getReifier(); | ||
| 125 | fts[j].accept(r); | ||
| 126 | ts[j] = r.getResult(); | ||
| 127 | } | ||
| 128 | // cache result | ||
| 129 | bounds = ts; | ||
| 130 | // could throw away bound ASTs here; thread safety? | ||
| 131 | } | ||
| 132 | return bounds.clone(); // return cached bounds | ||
| 133 | } | ||
| 134 | |||
| 135 | /** | ||
| 136 | * Returns the <tt>GenericDeclaration</tt> object representing the | ||
| 137 | * generic declaration that declared this type variable. | ||
| 138 | * | ||
| 139 | * @return the generic declaration that declared this type variable. | ||
| 140 | * | ||
| 141 | * @since 1.5 | ||
| 142 | */ | ||
| 143 | public D getGenericDeclaration(){ | ||
| 144 | return genericDeclaration; | ||
| 145 | } | ||
| 146 | |||
| 147 | |||
| 148 | /** | ||
| 149 | * Returns the name of this type variable, as it occurs in the source code. | ||
| 150 | * | ||
| 151 | * @return the name of this type variable, as it appears in the source code | ||
| 152 | */ | ||
| 153 | public String getName() { return name; } | ||
| 154 | |||
| 155 | public String toString() {return getName();} | ||
| 156 | |||
| 157 | @Override | ||
| 158 | public boolean equals(Object o) { | ||
| 159 | if (o instanceof TypeVariable) { | ||
| 160 | TypeVariable that = (TypeVariable) o; | ||
| 161 | |||
| 162 | GenericDeclaration thatDecl = that.getGenericDeclaration(); | ||
| 163 | String thatName = that.getName(); | ||
| 164 | |||
| 165 | return | ||
| 166 | (genericDeclaration == null ? | ||
| 167 | thatDecl == null : | ||
| 168 | genericDeclaration.equals(thatDecl)) && | ||
| 169 | (name == null ? | ||
| 170 | thatName == null : | ||
| 171 | name.equals(thatName)); | ||
| 172 | |||
| 173 | } else | ||
| 174 | return false; | ||
| 175 | } | ||
| 176 | |||
| 177 | @Override | ||
| 178 | public int hashCode() { | ||
| 179 | return genericDeclaration.hashCode() ^ name.hashCode(); | ||
| 180 | } | ||
| 181 | } | ||