Thu, 24 May 2018 16:39:31 +0800
Merge
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 *
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 */
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.reflect.Field;
88 import java.lang.reflect.Member;
89 import java.lang.reflect.Method;
90 import java.lang.reflect.Modifier;
91 import java.util.ArrayList;
92 import java.util.Collection;
93 import java.util.Collections;
94 import java.util.Map;
95 import jdk.internal.dynalink.support.Lookup;
97 /**
98 * Base for classes that expose class field and method information to an {@link AbstractJavaLinker}. There are
99 * subclasses for instance (bean) and static facet of a class.
100 * @author Attila Szegedi
101 */
102 abstract class FacetIntrospector {
103 private final Class<?> clazz;
104 private final boolean instance;
105 private final boolean isRestricted;
107 protected final AccessibleMembersLookup membersLookup;
109 FacetIntrospector(final Class<?> clazz, final boolean instance) {
110 this.clazz = clazz;
111 this.instance = instance;
112 isRestricted = CheckRestrictedPackage.isRestrictedClass(clazz);
113 membersLookup = new AccessibleMembersLookup(clazz, instance);
114 }
116 /**
117 * Returns getters for inner classes.
118 * @return getters for inner classes.
119 */
120 abstract Map<String, MethodHandle> getInnerClassGetters();
122 /**
123 * Returns the fields for the class facet.
124 * @return the fields for the class facet.
125 */
126 Collection<Field> getFields() {
127 if(isRestricted) {
128 // NOTE: we can't do anything here. Unlike with methods in AccessibleMethodsLookup, we can't just return
129 // the fields from a public superclass, because this class might define same-named fields which will shadow
130 // the superclass fields, and we have no way to know if they do, since we're denied invocation of
131 // getFields(). Therefore, the only correct course of action is to not expose any public fields from a class
132 // defined in a restricted package.
133 return Collections.emptySet();
134 }
136 final Field[] fields = clazz.getFields();
137 final Collection<Field> cfields = new ArrayList<>(fields.length);
138 for(final Field field: fields) {
139 final boolean isStatic = Modifier.isStatic(field.getModifiers());
140 if(isStatic && clazz != field.getDeclaringClass()) {
141 // ignore inherited static fields
142 continue;
143 }
145 if(instance != isStatic && isAccessible(field)) {
146 cfields.add(field);
147 }
148 }
149 return cfields;
150 }
152 boolean isAccessible(final Member m) {
153 final Class<?> declaring = m.getDeclaringClass();
154 // (declaring == clazz) is just an optimization - we're calling this only from code that operates on a
155 // non-restricted class, so if the declaring class is identical to the class being inspected, then forego
156 // a potentially expensive restricted-package check.
157 return declaring == clazz || !CheckRestrictedPackage.isRestrictedClass(declaring);
158 }
160 /**
161 * Returns all the methods in the facet.
162 * @return all the methods in the facet.
163 */
164 Collection<Method> getMethods() {
165 return membersLookup.getMethods();
166 }
169 MethodHandle unreflectGetter(final Field field) {
170 return editMethodHandle(Lookup.PUBLIC.unreflectGetter(field));
171 }
173 MethodHandle unreflectSetter(final Field field) {
174 return editMethodHandle(Lookup.PUBLIC.unreflectSetter(field));
175 }
177 /**
178 * Returns an edited method handle. A facet might need to edit an unreflected method handle before it is usable with
179 * the facet. By default, returns the passed method handle unchanged. The class' static facet will introduce a
180 * dropArguments.
181 * @param mh the method handle to edit.
182 * @return the edited method handle.
183 */
184 abstract MethodHandle editMethodHandle(MethodHandle mh);
185 }