diff -r 95d3e01c04c3 -r 86cb162cec6c nashorn/src/jdk/internal/dynalink/linker/GuardingTypeConverterFactory.java --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/nashorn/src/jdk/internal/dynalink/linker/GuardingTypeConverterFactory.java Thu Feb 14 13:22:26 2013 +0100 @@ -0,0 +1,114 @@ +/* + * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. Oracle designates this + * particular file as subject to the "Classpath" exception as provided + * by Oracle in the LICENSE file that accompanied this code. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA + * or visit www.oracle.com if you need additional information or have any + * questions. + */ + +/* + * This file is available under and governed by the GNU General Public + * License version 2 only, as published by the Free Software Foundation. + * However, the following notice accompanied the original version of this + * file, and Oracle licenses the original version of this file under the BSD + * license: + */ +/* + Copyright 2009-2013 Attila Szegedi + + Licensed under both the Apache License, Version 2.0 (the "Apache License") + and the BSD License (the "BSD License"), with licensee being free to + choose either of the two at their discretion. + + You may not use this file except in compliance with either the Apache + License or the BSD License. + + If you choose to use this file in compliance with the Apache License, the + following notice applies to you: + + You may obtain a copy of the Apache License at + + http://www.apache.org/licenses/LICENSE-2.0 + + Unless required by applicable law or agreed to in writing, software + distributed under the License is distributed on an "AS IS" BASIS, + WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or + implied. See the License for the specific language governing + permissions and limitations under the License. + + If you choose to use this file in compliance with the BSD License, the + following notice applies to you: + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions are + met: + * Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + * Redistributions in binary form must reproduce the above copyright + notice, this list of conditions and the following disclaimer in the + documentation and/or other materials provided with the distribution. + * Neither the name of the copyright holder nor the names of + contributors may be used to endorse or promote products derived from + this software without specific prior written permission. + + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS + IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED + TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A + PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDER + BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR + BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, + WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR + OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF + ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. +*/ + +package jdk.internal.dynalink.linker; + +import jdk.internal.dynalink.support.TypeUtilities; + +/** + * Optional interface that can be implemented by {@link GuardingDynamicLinker} implementations to provide + * language-runtime specific implicit type conversion capabilities. Note that if you implement this interface, you will + * very likely want to implement {@link ConversionComparator} interface too, as your additional language-specific + * conversions, in absence of a strategy for prioritizing these conversions, will cause more ambiguity in selecting the + * correct overload when trying to link to an overloaded POJO method. + * + * @author Attila Szegedi + */ +public interface GuardingTypeConverterFactory { + /** + * Returns a guarded invocation that receives an Object of the specified source type and returns an Object converted + * to the specified target type. The type of the invocation is targetType(sourceType), while the type of the guard + * is boolean(sourceType). Note that this will never be invoked for type conversions allowed by the JLS 5.3 "Method + * Invocation Conversion", see {@link TypeUtilities#isMethodInvocationConvertible(Class, Class)} for details. An + * implementation can assume it is never requested to produce a converter for these conversions. + * + * @param sourceType source type + * @param targetType the target type. + * @return a guarded invocation that can take an object (if it passes guard) and returns another object that is its + * representation coerced into the target type. In case the factory is certain it is unable to handle a conversion, + * it can return null. In case the factory is certain that it can always handle the conversion, it can return an + * unconditional invocation (one whose guard is null). + * @throws Exception if there was an error during creation of the converter + */ + public GuardedInvocation convertToType(Class sourceType, Class targetType) throws Exception; +} \ No newline at end of file