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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 sun.reflect.generics.tree.FieldTypeSignature; | |
| 29 | + | |
| 30 | +import java.lang.reflect.MalformedParameterizedTypeException; | |
| 31 | +import java.lang.reflect.Method; | |
| 32 | +import java.lang.reflect.ParameterizedType; | |
| 33 | +import java.lang.reflect.Type; | |
| 34 | +import java.lang.reflect.TypeVariable; | |
| 35 | +import java.util.Arrays; | |
| 36 | + | |
| 37 | + | |
| 38 | +/** Implementing class for ParameterizedType interface. */ | |
| 39 | + | |
| 40 | +public class ParameterizedTypeImpl implements ParameterizedType { | |
| 41 | + private Type[] actualTypeArguments; | |
| 42 | + private Class<?> rawType; | |
| 43 | + private Type ownerType; | |
| 44 | + | |
| 45 | + private ParameterizedTypeImpl(Class<?> rawType, | |
| 46 | + Type[] actualTypeArguments, | |
| 47 | + Type ownerType) { | |
| 48 | + this.actualTypeArguments = actualTypeArguments; | |
| 49 | + this.rawType = rawType; | |
| 50 | + if (ownerType != null) { | |
| 51 | + this.ownerType = ownerType; | |
| 52 | + } else { this.ownerType = rawType.getDeclaringClass();} | |
| 53 | + validateConstructorArguments(); | |
| 54 | + } | |
| 55 | + | |
| 56 | + private void validateConstructorArguments() { | |
| 57 | + TypeVariable/*<?>*/[] formals = rawType.getTypeParameters(); | |
| 58 | + // check correct arity of actual type args | |
| 59 | + if (formals.length != actualTypeArguments.length){ | |
| 60 | + throw new MalformedParameterizedTypeException(); | |
| 61 | + } | |
| 62 | + for (int i = 0; i < actualTypeArguments.length; i++) { | |
| 63 | + // check actuals against formals' bounds | |
| 64 | + } | |
| 65 | + | |
| 66 | + } | |
| 67 | + | |
| 68 | + /** | |
| 69 | + * Static factory. Given a (generic) class, actual type arguments | |
| 70 | + * and an owner type, creates a parameterized type. | |
| 71 | + * This class can be instantiated with a a raw type that does not | |
| 72 | + * represent a generic type, provided the list of actual type | |
| 73 | + * arguments is empty. | |
| 74 | + * If the ownerType argument is null, the declaring class of the | |
| 75 | + * raw type is used as the owner type. | |
| 76 | + * <p> This method throws a MalformedParameterizedTypeException | |
| 77 | + * under the following circumstances: | |
| 78 | + * If the number of actual type arguments (i.e., the size of the | |
| 79 | + * array <tt>typeArgs</tt>) does not correspond to the number of | |
| 80 | + * formal type arguments. | |
| 81 | + * If any of the actual type arguments is not an instance of the | |
| 82 | + * bounds on the corresponding formal. | |
| 83 | + * @param rawType the Class representing the generic type declaration being | |
| 84 | + * instantiated | |
| 85 | + * @param actualTypeArguments - a (possibly empty) array of types | |
| 86 | + * representing the actual type arguments to the parameterized type | |
| 87 | + * @param ownerType - the enclosing type, if known. | |
| 88 | + * @return An instance of <tt>ParameterizedType</tt> | |
| 89 | + * @throws MalformedParameterizedTypeException - if the instantiation | |
| 90 | + * is invalid | |
| 91 | + */ | |
| 92 | + public static ParameterizedTypeImpl make(Class<?> rawType, | |
| 93 | + Type[] actualTypeArguments, | |
| 94 | + Type ownerType) { | |
| 95 | + return new ParameterizedTypeImpl(rawType, actualTypeArguments, | |
| 96 | + ownerType); | |
| 97 | + } | |
| 98 | + | |
| 99 | + | |
| 100 | + /** | |
| 101 | + * Returns an array of <tt>Type</tt> objects representing the actual type | |
| 102 | + * arguments to this type. | |
| 103 | + * | |
| 104 | + * <p>Note that in some cases, the returned array be empty. This can occur | |
| 105 | + * if this type represents a non-parameterized type nested within | |
| 106 | + * a parameterized type. | |
| 107 | + * | |
| 108 | + * @return an array of <tt>Type</tt> objects representing the actual type | |
| 109 | + * arguments to this type | |
| 110 | + * @throws <tt>TypeNotPresentException</tt> if any of the | |
| 111 | + * actual type arguments refers to a non-existent type declaration | |
| 112 | + * @throws <tt>MalformedParameterizedTypeException</tt> if any of the | |
| 113 | + * actual type parameters refer to a parameterized type that cannot | |
| 114 | + * be instantiated for any reason | |
| 115 | + * @since 1.5 | |
| 116 | + */ | |
| 117 | + public Type[] getActualTypeArguments() { | |
| 118 | + return actualTypeArguments.clone(); | |
| 119 | + } | |
| 120 | + | |
| 121 | + /** | |
| 122 | + * Returns the <tt>Type</tt> object representing the class or interface | |
| 123 | + * that declared this type. | |
| 124 | + * | |
| 125 | + * @return the <tt>Type</tt> object representing the class or interface | |
| 126 | + * that declared this type | |
| 127 | + */ | |
| 128 | + public Class<?> getRawType() { | |
| 129 | + return rawType; | |
| 130 | + } | |
| 131 | + | |
| 132 | + | |
| 133 | + /** | |
| 134 | + * Returns a <tt>Type</tt> object representing the type that this type | |
| 135 | + * is a member of. For example, if this type is <tt>O<T>.I<S></tt>, | |
| 136 | + * return a representation of <tt>O<T></tt>. | |
| 137 | + * | |
| 138 | + * <p>If this type is a top-level type, <tt>null</tt> is returned. | |
| 139 | + * | |
| 140 | + * @return a <tt>Type</tt> object representing the type that | |
| 141 | + * this type is a member of. If this type is a top-level type, | |
| 142 | + * <tt>null</tt> is returned | |
| 143 | + * @throws <tt>TypeNotPresentException</tt> if the owner type | |
| 144 | + * refers to a non-existent type declaration | |
| 145 | + * @throws <tt>MalformedParameterizedTypeException</tt> if the owner type | |
| 146 | + * refers to a parameterized type that cannot be instantiated | |
| 147 | + * for any reason | |
| 148 | + * | |
| 149 | + */ | |
| 150 | + public Type getOwnerType() { | |
| 151 | + return ownerType; | |
| 152 | + } | |
| 153 | + | |
| 154 | + /* | |
| 155 | + * From the JavaDoc for java.lang.reflect.ParameterizedType | |
| 156 | + * "Instances of classes that implement this interface must | |
| 157 | + * implement an equals() method that equates any two instances | |
| 158 | + * that share the same generic type declaration and have equal | |
| 159 | + * type parameters." | |
| 160 | + */ | |
| 161 | + @Override | |
| 162 | + public boolean equals(Object o) { | |
| 163 | + if (o instanceof ParameterizedType) { | |
| 164 | + // Check that information is equivalent | |
| 165 | + ParameterizedType that = (ParameterizedType) o; | |
| 166 | + | |
| 167 | + if (this == that) | |
| 168 | + return true; | |
| 169 | + | |
| 170 | + Type thatOwner = that.getOwnerType(); | |
| 171 | + Type thatRawType = that.getRawType(); | |
| 172 | + | |
| 173 | + if (false) { // Debugging | |
| 174 | + boolean ownerEquality = (ownerType == null ? | |
| 175 | + thatOwner == null : | |
| 176 | + ownerType.equals(thatOwner)); | |
| 177 | + boolean rawEquality = (rawType == null ? | |
| 178 | + thatRawType == null : | |
| 179 | + rawType.equals(thatRawType)); | |
| 180 | + | |
| 181 | + boolean typeArgEquality = Arrays.equals(actualTypeArguments, // avoid clone | |
| 182 | + that.getActualTypeArguments()); | |
| 183 | + for (Type t : actualTypeArguments) { | |
| 184 | + System.out.printf("\t\t%s%s%n", t, t.getClass()); | |
| 185 | + } | |
| 186 | + | |
| 187 | + System.out.printf("\towner %s\traw %s\ttypeArg %s%n", | |
| 188 | + ownerEquality, rawEquality, typeArgEquality); | |
| 189 | + return ownerEquality && rawEquality && typeArgEquality; | |
| 190 | + } | |
| 191 | + | |
| 192 | + | |
| 193 | + return | |
| 194 | + (ownerType == null ? | |
| 195 | + thatOwner == null : | |
| 196 | + ownerType.equals(thatOwner)) && | |
| 197 | + (rawType == null ? | |
| 198 | + thatRawType == null : | |
| 199 | + rawType.equals(thatRawType)) && | |
| 200 | + Arrays.equals(actualTypeArguments, // avoid clone | |
| 201 | + that.getActualTypeArguments()); | |
| 202 | + } else | |
| 203 | + return false; | |
| 204 | + } | |
| 205 | + | |
| 206 | + @Override | |
| 207 | + public int hashCode() { | |
| 208 | + return | |
| 209 | + Arrays.hashCode(actualTypeArguments) ^ | |
| 210 | + (ownerType == null ? 0 : ownerType.hashCode() ) ^ | |
| 211 | + (rawType == null ? 0 : rawType.hashCode() ); | |
| 212 | + } | |
| 213 | + | |
| 214 | + public String toString() { | |
| 215 | + StringBuilder sb = new StringBuilder(); | |
| 216 | + | |
| 217 | + if (ownerType != null) { | |
| 218 | + if (ownerType instanceof Class) | |
| 219 | + sb.append(((Class)ownerType).getName()); | |
| 220 | + else | |
| 221 | + sb.append(ownerType.toString()); | |
| 222 | + | |
| 223 | + sb.append("."); | |
| 224 | + | |
| 225 | + if (ownerType instanceof ParameterizedTypeImpl) { | |
| 226 | + // Find simple name of nested type by removing the | |
| 227 | + // shared prefix with owner. | |
| 228 | + sb.append(rawType.getName().replace( ((ParameterizedTypeImpl)ownerType).rawType.getName() + "$", | |
| 229 | + "")); | |
| 230 | + } else | |
| 231 | + sb.append(rawType.getName()); | |
| 232 | + } else | |
| 233 | + sb.append(rawType.getName()); | |
| 234 | + | |
| 235 | + if (actualTypeArguments != null && | |
| 236 | + actualTypeArguments.length > 0) { | |
| 237 | + sb.append("<"); | |
| 238 | + boolean first = true; | |
| 239 | + for(Type t: actualTypeArguments) { | |
| 240 | + if (!first) | |
| 241 | + sb.append(", "); | |
| 242 | + if (t instanceof Class) | |
| 243 | + sb.append(((Class)t).getName()); | |
| 244 | + else | |
| 245 | + sb.append(t.toString()); | |
| 246 | + first = false; | |
| 247 | + } | |
| 248 | + sb.append(">"); | |
| 249 | + } | |
| 250 | + | |
| 251 | + return sb.toString(); | |
| 252 | + } | |
| 253 | +} | |