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 84package jdk.dynalink.beans; 85 86import java.lang.invoke.MethodHandle; 87import jdk.dynalink.CallSiteDescriptor; 88import jdk.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 */ 97abstract class DynamicMethod { 98 private final String name; 99 100 DynamicMethod(final String name) { 101 this.name = name; 102 } 103 104 String getName() { 105 return name; 106 } 107 108 /** 109 * Creates an invocation for the dynamic method. If the method is overloaded, it will perform overloaded method 110 * resolution based on the specified method type. The resulting resolution can either identify a single method to be 111 * invoked among the overloads, or it can identify multiple ones. In the latter case, the returned method handle 112 * will perform further overload resolution among these candidates at every invocation. If the method to be invoked 113 * is a variable arguments (vararg) method, it will pack the extra arguments in an array before the invocation of 114 * the underlying method if it is not already done. 115 * 116 * @param callSiteDescriptor the descriptor of the call site 117 * @param linkerServices linker services. Used for language-specific type conversions. 118 * @return an invocation suitable for calling the method from the specified call site. 119 */ 120 abstract MethodHandle getInvocation(CallSiteDescriptor callSiteDescriptor, LinkerServices linkerServices); 121 122 /** 123 * Returns a single dynamic method representing a single underlying Java method (possibly selected among several 124 * overloads) with formal parameter types exactly matching the passed signature. 125 * @param paramTypes the comma-separated list of requested parameter type names. The names will match both 126 * qualified and unqualified type names. 127 * @return a single dynamic method representing a single underlying Java method, or null if none of the Java methods 128 * behind this dynamic method exactly match the requested parameter types. 129 */ 130 abstract SingleDynamicMethod getMethodForExactParamTypes(String paramTypes); 131 132 /** 133 * True if this dynamic method already contains a method with an identical signature as the passed in method. 134 * @param method the method to check 135 * @return true if it already contains an equivalent method. 136 */ 137 abstract boolean contains(SingleDynamicMethod method); 138 139 static String getClassAndMethodName(final Class<?> clazz, final String name) { 140 final String clazzName = clazz.getCanonicalName(); 141 return (clazzName == null ? clazz.getName() : clazzName) + "." + name; 142 } 143 144 @Override 145 public String toString() { 146 return "[" + getClass().getName() + " " + getName() + "]"; 147 } 148 149 /** 150 * True if this method happens to be a constructor method. 151 * 152 * @return true if this represents a constructor. 153 */ 154 boolean isConstructor() { 155 return false; 156 } 157} 158