Mercurial > jdk8-mips64-public > nashorn / file comparison

comparison: src/jdk/internal/dynalink/beans/CallerSensitiveDynamicMethod.java

src/jdk/internal/dynalink/beans/CallerSensitiveDynamicMethod.java

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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 */
25
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
35
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.
39
40 You may not use this file except in compliance with either the Apache
41 License or the BSD License.
42
43 If you choose to use this file in compliance with the Apache License, the
44 following notice applies to you:
45
46 You may obtain a copy of the Apache License at
47
48 http://www.apache.org/licenses/LICENSE-2.0
49
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.
55
56 If you choose to use this file in compliance with the BSD License, the
57 following notice applies to you:
58
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.
70
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 */
83
84 package jdk.internal.dynalink.beans;
85
86 import java.lang.invoke.MethodHandle;
87 import java.lang.invoke.MethodHandles;
88 import java.lang.invoke.MethodType;
89 import java.lang.reflect.AccessibleObject;
90 import java.lang.reflect.Constructor;
91 import java.lang.reflect.Member;
92 import java.lang.reflect.Method;
93 import java.lang.reflect.Modifier;
94 import jdk.internal.dynalink.support.Lookup;
95
96 /**
97 * A dynamic method bound to exactly one Java method or constructor that is caller sensitive. Since the target method is
98 * caller sensitive, it doesn't cache a method handle but rather uses the passed lookup object in
99 * {@link #getTarget(java.lang.invoke.MethodHandles.Lookup)} to unreflect a method handle from the reflective member on
100 * every request.
101 *
102 * @author Attila Szegedi
103 */
104 class CallerSensitiveDynamicMethod extends SingleDynamicMethod {
105 // Typed as "AccessibleObject" as it can be either a method or a constructor.
106 // If we were Java8-only, we could use java.lang.reflect.Executable
107 private final AccessibleObject target;
108 private final MethodType type;
109
110 public CallerSensitiveDynamicMethod(AccessibleObject target) {
111 super(getName(target));
112 this.target = target;
113 this.type = getMethodType(target);
114 }
115
116 private static String getName(AccessibleObject target) {
117 final Member m = (Member)target;
118 return getMethodNameWithSignature(getMethodType(target), getClassAndMethodName(m.getDeclaringClass(),
119 m.getName()));
120 }
121
122 @Override
123 MethodType getMethodType() {
124 return type;
125 }
126
127 private static MethodType getMethodType(AccessibleObject ao) {
128 final boolean isMethod = ao instanceof Method;
129 final Class<?> rtype = isMethod ? ((Method)ao).getReturnType() : ((Constructor<?>)ao).getDeclaringClass();
130 final Class<?>[] ptypes = isMethod ? ((Method)ao).getParameterTypes() : ((Constructor<?>)ao).getParameterTypes();
131 final MethodType type = MethodType.methodType(rtype, ptypes);
132 final Member m = (Member)ao;
133 return type.insertParameterTypes(0,
134 isMethod ?
135 Modifier.isStatic(m.getModifiers()) ?
136 Object.class :
137 m.getDeclaringClass() :
138 StaticClass.class);
139 }
140
141 @Override
142 boolean isVarArgs() {
143 return target instanceof Method ? ((Method)target).isVarArgs() : ((Constructor<?>)target).isVarArgs();
144 }
145
146 @Override
147 MethodHandle getTarget(MethodHandles.Lookup lookup) {
148 if(target instanceof Method) {
149 final MethodHandle mh = Lookup.unreflect(lookup, (Method)target);
150 if(Modifier.isStatic(((Member)target).getModifiers())) {
151 return StaticClassIntrospector.editStaticMethodHandle(mh);
152 }
153 return mh;
154 }
155 return StaticClassIntrospector.editConstructorMethodHandle(Lookup.unreflectConstructor(lookup,
156 (Constructor<?>)target));
157 }
158 }

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