1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/jdk/internal/dynalink/beans/DynamicMethod.java Thu Feb 14 13:22:26 2013 +0100
1.3 @@ -0,0 +1,169 @@
1.4 +/*
1.5 + * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation. Oracle designates this
1.11 + * particular file as subject to the "Classpath" exception as provided
1.12 + * by Oracle in the LICENSE file that accompanied this code.
1.13 + *
1.14 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.15 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.16 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.17 + * version 2 for more details (a copy is included in the LICENSE file that
1.18 + * accompanied this code).
1.19 + *
1.20 + * You should have received a copy of the GNU General Public License version
1.21 + * 2 along with this work; if not, write to the Free Software Foundation,
1.22 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.23 + *
1.24 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.25 + * or visit www.oracle.com if you need additional information or have any
1.26 + * questions.
1.27 + */
1.28 +
1.29 +/*
1.30 + * This file is available under and governed by the GNU General Public
1.31 + * License version 2 only, as published by the Free Software Foundation.
1.32 + * However, the following notice accompanied the original version of this
1.33 + * file, and Oracle licenses the original version of this file under the BSD
1.34 + * license:
1.35 + */
1.36 +/*
1.37 + Copyright 2009-2013 Attila Szegedi
1.38 +
1.39 + Licensed under both the Apache License, Version 2.0 (the "Apache License")
1.40 + and the BSD License (the "BSD License"), with licensee being free to
1.41 + choose either of the two at their discretion.
1.42 +
1.43 + You may not use this file except in compliance with either the Apache
1.44 + License or the BSD License.
1.45 +
1.46 + If you choose to use this file in compliance with the Apache License, the
1.47 + following notice applies to you:
1.48 +
1.49 + You may obtain a copy of the Apache License at
1.50 +
1.51 + http://www.apache.org/licenses/LICENSE-2.0
1.52 +
1.53 + Unless required by applicable law or agreed to in writing, software
1.54 + distributed under the License is distributed on an "AS IS" BASIS,
1.55 + WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
1.56 + implied. See the License for the specific language governing
1.57 + permissions and limitations under the License.
1.58 +
1.59 + If you choose to use this file in compliance with the BSD License, the
1.60 + following notice applies to you:
1.61 +
1.62 + Redistribution and use in source and binary forms, with or without
1.63 + modification, are permitted provided that the following conditions are
1.64 + met:
1.65 + * Redistributions of source code must retain the above copyright
1.66 + notice, this list of conditions and the following disclaimer.
1.67 + * Redistributions in binary form must reproduce the above copyright
1.68 + notice, this list of conditions and the following disclaimer in the
1.69 + documentation and/or other materials provided with the distribution.
1.70 + * Neither the name of the copyright holder nor the names of
1.71 + contributors may be used to endorse or promote products derived from
1.72 + this software without specific prior written permission.
1.73 +
1.74 + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
1.75 + IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
1.76 + TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
1.77 + PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDER
1.78 + BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
1.79 + CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
1.80 + SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
1.81 + BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
1.82 + WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
1.83 + OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
1.84 + ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.85 +*/
1.86 +
1.87 +package jdk.internal.dynalink.beans;
1.88 +
1.89 +import java.lang.invoke.MethodHandle;
1.90 +import java.lang.invoke.MethodType;
1.91 +import java.util.StringTokenizer;
1.92 +import jdk.internal.dynalink.linker.LinkerServices;
1.93 +
1.94 +
1.95 +/**
1.96 + * Represents a single dynamic method. A "dynamic" method can be bound to a single Java method, or can be bound to all
1.97 + * overloaded methods of the same name on a class. Getting an invocation of a dynamic method bound to multiple
1.98 + * overloaded methods will perform overload resolution (actually, it will perform partial overloaded resolution at link
1.99 + * time, but if that fails to identify exactly one target method, it will generate a method handle that will perform the
1.100 + * rest of the overload resolution at invocation time for actual argument types).
1.101 + *
1.102 + * @author Attila Szegedi
1.103 + */
1.104 +abstract class DynamicMethod {
1.105 + private final String name;
1.106 +
1.107 + DynamicMethod(String name) {
1.108 + this.name = name;
1.109 + }
1.110 +
1.111 + String getName() {
1.112 + return name;
1.113 + }
1.114 +
1.115 + /**
1.116 + * Creates an invocation for the dynamic method. If the method is overloaded, it will perform overloaded method
1.117 + * resolution based on the specified method type. The resulting resolution can either identify a single method to be
1.118 + * invoked among the overloads, or it can identify multiple ones. In the latter case, the returned method handle
1.119 + * will perform further overload resolution among these candidates at every invocation. If the method to be invoked
1.120 + * is a variable arguments (vararg) method, it will pack the extra arguments in an array before the invocation of
1.121 + * the underlying method if it is not already done.
1.122 + *
1.123 + * @param callSiteType the method type at a call site
1.124 + * @param linkerServices linker services. Used for language-specific type conversions.
1.125 + * @return an invocation suitable for calling the method from the specified call site.
1.126 + */
1.127 + abstract MethodHandle getInvocation(MethodType callSiteType, LinkerServices linkerServices);
1.128 +
1.129 + /**
1.130 + * Returns a simple dynamic method representing a single underlying Java method (possibly selected among several
1.131 + * overloads) with formal parameter types exactly matching the passed signature.
1.132 + * @param paramTypes the comma-separated list of requested parameter type names. The names will match both
1.133 + * qualified and unqualified type names.
1.134 + * @return a simple dynamic method representing a single underlying Java method, or null if none of the Java methods
1.135 + * behind this dynamic method exactly match the requested parameter types.
1.136 + */
1.137 + abstract SimpleDynamicMethod getMethodForExactParamTypes(String paramTypes);
1.138 +
1.139 + /**
1.140 + * True if this dynamic method already contains a method handle with an identical signature as the passed in method
1.141 + * handle.
1.142 + * @param mh the method handle to check
1.143 + * @return true if it already contains an equivalent method handle.
1.144 + */
1.145 + abstract boolean contains(MethodHandle mh);
1.146 +
1.147 + static boolean typeMatchesDescription(String paramTypes, MethodType type) {
1.148 + final StringTokenizer tok = new StringTokenizer(paramTypes, ", ");
1.149 + for(int i = 1; i < type.parameterCount(); ++i) { // i = 1 as we ignore the receiver
1.150 + if(!(tok.hasMoreTokens() && typeNameMatches(tok.nextToken(), type.parameterType(i)))) {
1.151 + return false;
1.152 + }
1.153 + }
1.154 + return !tok.hasMoreTokens();
1.155 + }
1.156 +
1.157 + private static boolean typeNameMatches(String typeName, Class<?> type) {
1.158 + final int lastDot = typeName.lastIndexOf('.');
1.159 + final String fullTypeName = type.getCanonicalName();
1.160 + return lastDot != -1 && fullTypeName.endsWith(typeName.substring(lastDot)) || typeName.equals(fullTypeName);
1.161 + }
1.162 +
1.163 + static String getClassAndMethodName(Class<?> clazz, String name) {
1.164 + final String clazzName = clazz.getCanonicalName();
1.165 + return (clazzName == null ? clazz.getName() : clazzName) + "." + name;
1.166 + }
1.167 +
1.168 + @Override
1.169 + public String toString() {
1.170 + return "[" + getClass().getName() + " " + getName() + "]";
1.171 + }
1.172 +}
1.173 \ No newline at end of file
