Mon, 15 Jul 2013 12:33:48 +0200
8020324: Implement Object.bindProperties(target, source) for beans
Reviewed-by: hannesw, sundar
1 /*
2 * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
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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).
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26 /*
27 * This file is available under and governed by the GNU General Public
28 * License version 2 only, as published by the Free Software Foundation.
29 * However, the following notice accompanied the original version of this
30 * file, and Oracle licenses the original version of this file under the BSD
31 * license:
32 */
33 /*
34 Copyright 2009-2013 Attila Szegedi
36 Licensed under both the Apache License, Version 2.0 (the "Apache License")
37 and the BSD License (the "BSD License"), with licensee being free to
38 choose either of the two at their discretion.
40 You may not use this file except in compliance with either the Apache
41 License or the BSD License.
43 If you choose to use this file in compliance with the Apache License, the
44 following notice applies to you:
46 You may obtain a copy of the Apache License at
48 http://www.apache.org/licenses/LICENSE-2.0
50 Unless required by applicable law or agreed to in writing, software
51 distributed under the License is distributed on an "AS IS" BASIS,
52 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
53 implied. See the License for the specific language governing
54 permissions and limitations under the License.
56 If you choose to use this file in compliance with the BSD License, the
57 following notice applies to you:
59 Redistribution and use in source and binary forms, with or without
60 modification, are permitted provided that the following conditions are
61 met:
62 * Redistributions of source code must retain the above copyright
63 notice, this list of conditions and the following disclaimer.
64 * Redistributions in binary form must reproduce the above copyright
65 notice, this list of conditions and the following disclaimer in the
66 documentation and/or other materials provided with the distribution.
67 * Neither the name of the copyright holder nor the names of
68 contributors may be used to endorse or promote products derived from
69 this software without specific prior written permission.
71 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
72 IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
73 TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
74 PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDER
75 BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
76 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
77 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
78 BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
79 WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
80 OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
81 ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
82 */
84 package jdk.internal.dynalink.beans;
86 import java.lang.invoke.MethodHandle;
87 import java.lang.invoke.MethodHandles;
88 import java.lang.invoke.MethodType;
89 import java.lang.reflect.Array;
90 import java.util.Arrays;
91 import java.util.Collection;
92 import jdk.internal.dynalink.CallSiteDescriptor;
93 import jdk.internal.dynalink.beans.GuardedInvocationComponent.ValidationType;
94 import jdk.internal.dynalink.linker.GuardedInvocation;
95 import jdk.internal.dynalink.linker.LinkRequest;
96 import jdk.internal.dynalink.linker.LinkerServices;
97 import jdk.internal.dynalink.linker.TypeBasedGuardingDynamicLinker;
98 import jdk.internal.dynalink.support.Lookup;
100 /**
101 * Provides a linker for the {@link StaticClass} objects.
102 * @author Attila Szegedi
103 */
104 class StaticClassLinker implements TypeBasedGuardingDynamicLinker {
105 private static final ClassValue<SingleClassStaticsLinker> linkers = new ClassValue<SingleClassStaticsLinker>() {
106 @Override
107 protected SingleClassStaticsLinker computeValue(Class<?> clazz) {
108 return new SingleClassStaticsLinker(clazz);
109 }
110 };
112 private static class SingleClassStaticsLinker extends AbstractJavaLinker {
113 private final DynamicMethod constructor;
115 SingleClassStaticsLinker(Class<?> clazz) {
116 super(clazz, IS_CLASS.bindTo(clazz));
117 // Map "staticClassObject.class" to StaticClass.getRepresentedClass(). Some adventurous soul could subclass
118 // StaticClass, so we use INSTANCE_OF validation instead of EXACT_CLASS.
119 setPropertyGetter("class", GET_CLASS, ValidationType.INSTANCE_OF);
120 constructor = createConstructorMethod(clazz);
121 }
123 /**
124 * Creates a dynamic method containing all overloads of a class' public constructor
125 * @param clazz the target class
126 * @return a dynamic method containing all overloads of a class' public constructor. If the class has no public
127 * constructors, returns null.
128 */
129 private static DynamicMethod createConstructorMethod(Class<?> clazz) {
130 if(clazz.isArray()) {
131 final MethodHandle boundArrayCtor = ARRAY_CTOR.bindTo(clazz.getComponentType());
132 return new SimpleDynamicMethod(StaticClassIntrospector.editConstructorMethodHandle(
133 boundArrayCtor.asType(boundArrayCtor.type().changeReturnType(clazz))), clazz, "<init>");
134 }
136 return createDynamicMethod(Arrays.asList(clazz.getConstructors()), clazz, "<init>");
137 }
139 @Override
140 FacetIntrospector createFacetIntrospector() {
141 return new StaticClassIntrospector(clazz);
142 }
144 @Override
145 public GuardedInvocation getGuardedInvocation(LinkRequest request, LinkerServices linkerServices)
146 throws Exception {
147 final GuardedInvocation gi = super.getGuardedInvocation(request, linkerServices);
148 if(gi != null) {
149 return gi;
150 }
151 final CallSiteDescriptor desc = request.getCallSiteDescriptor();
152 final String op = desc.getNameToken(CallSiteDescriptor.OPERATOR);
153 if("new" == op && constructor != null) {
154 final MethodHandle ctorInvocation = constructor.getInvocation(desc, linkerServices);
155 if(ctorInvocation != null) {
156 return new GuardedInvocation(ctorInvocation, getClassGuard(desc.getMethodType()));
157 }
158 }
159 return null;
160 }
161 }
163 static Collection<String> getReadableStaticPropertyNames(Class<?> clazz) {
164 return linkers.get(clazz).getReadablePropertyNames();
165 }
167 static Collection<String> getWritableStaticPropertyNames(Class<?> clazz) {
168 return linkers.get(clazz).getWritablePropertyNames();
169 }
171 static Collection<String> getStaticMethodNames(Class<?> clazz) {
172 return linkers.get(clazz).getMethodNames();
173 }
175 @Override
176 public GuardedInvocation getGuardedInvocation(LinkRequest request, LinkerServices linkerServices) throws Exception {
177 final Object receiver = request.getReceiver();
178 if(receiver instanceof StaticClass) {
179 return linkers.get(((StaticClass)receiver).getRepresentedClass()).getGuardedInvocation(request,
180 linkerServices);
181 }
182 return null;
183 }
185 @Override
186 public boolean canLinkType(Class<?> type) {
187 return type == StaticClass.class;
188 }
190 /*private*/ static final MethodHandle GET_CLASS = new Lookup(MethodHandles.lookup()).findVirtual(StaticClass.class,
191 "getRepresentedClass", MethodType.methodType(Class.class));
193 /*private*/ static final MethodHandle IS_CLASS = new Lookup(MethodHandles.lookup()).findStatic(StaticClassLinker.class,
194 "isClass", MethodType.methodType(Boolean.TYPE, Class.class, Object.class));
196 /*private*/ static final MethodHandle ARRAY_CTOR = Lookup.PUBLIC.findStatic(Array.class, "newInstance",
197 MethodType.methodType(Object.class, Class.class, int.class));
199 @SuppressWarnings("unused")
200 private static boolean isClass(Class<?> clazz, Object obj) {
201 return obj instanceof StaticClass && ((StaticClass)obj).getRepresentedClass() == clazz;
202 }
203 }