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

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

src/jdk/internal/dynalink/beans/DynamicMethod.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 jdk.internal.dynalink.CallSiteDescriptor;
88 import jdk.internal.dynalink.linker.LinkerServices;
89
90 /**
91 * Represents a single dynamic method. A "dynamic" method can be bound to a single Java method, or can be bound to all
92 * overloaded methods of the same name on a class. Getting an invocation of a dynamic method bound to multiple
93 * overloaded methods will perform overload resolution (actually, it will perform partial overloaded resolution at link
94 * time, but if that fails to identify exactly one target method, it will generate a method handle that will perform the
95 * rest of the overload resolution at invocation time for actual argument types).
96 *
97 * @author Attila Szegedi
98 */
99 abstract class DynamicMethod {
100 private final String name;
101
102 DynamicMethod(String name) {
103 this.name = name;
104 }
105
106 String getName() {
107 return name;
108 }
109
110 /**
111 * Creates an invocation for the dynamic method. If the method is overloaded, it will perform overloaded method
112 * resolution based on the specified method type. The resulting resolution can either identify a single method to be
113 * invoked among the overloads, or it can identify multiple ones. In the latter case, the returned method handle
114 * will perform further overload resolution among these candidates at every invocation. If the method to be invoked
115 * is a variable arguments (vararg) method, it will pack the extra arguments in an array before the invocation of
116 * the underlying method if it is not already done.
117 *
118 * @param callSiteDescriptor the descriptor of the call site
119 * @param linkerServices linker services. Used for language-specific type conversions.
120 * @return an invocation suitable for calling the method from the specified call site.
121 */
122 abstract MethodHandle getInvocation(CallSiteDescriptor callSiteDescriptor, LinkerServices linkerServices);
123
124 /**
125 * Returns a single dynamic method representing a single underlying Java method (possibly selected among several
126 * overloads) with formal parameter types exactly matching the passed signature.
127 * @param paramTypes the comma-separated list of requested parameter type names. The names will match both
128 * qualified and unqualified type names.
129 * @return a single dynamic method representing a single underlying Java method, or null if none of the Java methods
130 * behind this dynamic method exactly match the requested parameter types.
131 */
132 abstract SingleDynamicMethod getMethodForExactParamTypes(String paramTypes);
133
134 /**
135 * True if this dynamic method already contains a method with an identical signature as the passed in method.
136 * @param method the method to check
137 * @return true if it already contains an equivalent method.
138 */
139 abstract boolean contains(SingleDynamicMethod method);
140
141 static String getClassAndMethodName(Class<?> clazz, String name) {
142 final String clazzName = clazz.getCanonicalName();
143 return (clazzName == null ? clazz.getName() : clazzName) + "." + name;
144 }
145
146 @Override
147 public String toString() {
148 return "[" + getClass().getName() + " " + getName() + "]";
149 }
150 }

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