author | attila |
Mon, 19 Oct 2015 08:45:29 +0200 | |
changeset 33333 | 0bad500ce4e0 |
parent 33007 | 03119bfefbbf |
child 33337 | af3fea63e008 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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|
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/* |
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* This file is available under and governed by the GNU General Public |
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* License version 2 only, as published by the Free Software Foundation. |
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* However, the following notice accompanied the original version of this |
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* file, and Oracle licenses the original version of this file under the BSD |
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* license: |
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*/ |
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/* |
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Copyright 2009-2013 Attila Szegedi |
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|
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Licensed under both the Apache License, Version 2.0 (the "Apache License") |
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and the BSD License (the "BSD License"), with licensee being free to |
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choose either of the two at their discretion. |
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|
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You may not use this file except in compliance with either the Apache |
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License or the BSD License. |
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|
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If you choose to use this file in compliance with the Apache License, the |
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following notice applies to you: |
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|
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You may obtain a copy of the Apache License at |
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|
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http://www.apache.org/licenses/LICENSE-2.0 |
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|
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Unless required by applicable law or agreed to in writing, software |
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distributed under the License is distributed on an "AS IS" BASIS, |
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or |
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implied. See the License for the specific language governing |
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permissions and limitations under the License. |
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|
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If you choose to use this file in compliance with the BSD License, the |
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following notice applies to you: |
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|
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Redistribution and use in source and binary forms, with or without |
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modification, are permitted provided that the following conditions are |
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met: |
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* Redistributions of source code must retain the above copyright |
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notice, this list of conditions and the following disclaimer. |
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* Redistributions in binary form must reproduce the above copyright |
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notice, this list of conditions and the following disclaimer in the |
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documentation and/or other materials provided with the distribution. |
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* Neither the name of the copyright holder nor the names of |
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contributors may be used to endorse or promote products derived from |
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this software without specific prior written permission. |
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|
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS |
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IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
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TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A |
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PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDER |
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BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR |
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BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
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WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
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OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
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ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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package jdk.internal.dynalink.linker; |
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import java.lang.invoke.MethodHandle; |
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import java.lang.invoke.MethodHandles; |
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import java.lang.invoke.MethodType; |
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import jdk.internal.dynalink.DynamicLinker; |
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import jdk.internal.dynalink.DynamicLinkerFactory; |
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import jdk.internal.dynalink.linker.ConversionComparator.Comparison; |
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import jdk.internal.dynalink.support.TypeUtilities; |
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/** |
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* Interface for services provided to {@link GuardingDynamicLinker} instances by the {@link DynamicLinker} that owns |
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* them. You can think of it as the interface of the {@link DynamicLinker} that faces the {@link GuardingDynamicLinker} |
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* s. |
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*/ |
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public interface LinkerServices { |
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/** |
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* Similar to {@link MethodHandle#asType(MethodType)} except it also hooks in method handles produced by |
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* {@link GuardingTypeConverterFactory} implementations, providing for language-specific type coercing of |
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* parameters. It will apply {@link MethodHandle#asType(MethodType)} for all primitive-to-primitive, |
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* wrapper-to-primitive, primitive-to-wrapper conversions as well as for all upcasts. For all other conversions, |
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* it'll insert {@link MethodHandles#filterArguments(MethodHandle, int, MethodHandle...)} with composite filters |
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* provided by {@link GuardingTypeConverterFactory} implementations. |
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* |
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* @param handle target method handle |
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* @param fromType the types of source arguments |
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* @return a method handle that is a suitable combination of {@link MethodHandle#asType(MethodType)}, |
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* {@link MethodHandles#filterArguments(MethodHandle, int, MethodHandle...)}, and |
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* {@link MethodHandles#filterReturnValue(MethodHandle, MethodHandle)} with |
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* {@link GuardingTypeConverterFactory}-produced type converters as filters. |
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*/ |
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public MethodHandle asType(MethodHandle handle, MethodType fromType); |
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|
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/** |
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* Similar to {@link #asType(MethodHandle, MethodType)} except it only converts the return type of the method handle |
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* when it can be done using a conversion that loses neither precision nor magnitude, otherwise it leaves it |
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* unchanged. The idea is that other conversions should not be performed by individual linkers, but instead the |
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* {@link DynamicLinkerFactory#setPrelinkFilter(jdk.internal.dynalink.GuardedInvocationFilter) pre-link filter of |
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* the dynamic linker} should implement the strategy of dealing with potentially lossy return type conversions in a |
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* manner specific to the language runtime. |
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* |
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* @param handle target method handle |
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* @param fromType the types of source arguments |
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* @return a method handle that is a suitable combination of {@link MethodHandle#asType(MethodType)}, and |
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* {@link MethodHandles#filterArguments(MethodHandle, int, MethodHandle...)} with |
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* {@link GuardingTypeConverterFactory}-produced type converters as filters. |
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*/ |
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public default MethodHandle asTypeLosslessReturn(final MethodHandle handle, final MethodType fromType) { |
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final Class<?> handleReturnType = handle.type().returnType(); |
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return asType(handle, TypeUtilities.isConvertibleWithoutLoss(handleReturnType, fromType.returnType()) ? |
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fromType : fromType.changeReturnType(handleReturnType)); |
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} |
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/** |
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* Given a source and target type, returns a method handle that converts between them. Never returns null; in worst |
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* case it will return an identity conversion (that might fail for some values at runtime). You rarely need to use |
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* this method directly; you should mostly rely on {@link #asType(MethodHandle, MethodType)} instead. You really |
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* only need this method if you have a piece of your program that is written in Java, and you need to reuse existing |
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* type conversion machinery in a non-invokedynamic context. |
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* @param sourceType the type to convert from |
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* @param targetType the type to convert to |
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* @return a method handle performing the conversion. |
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*/ |
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public MethodHandle getTypeConverter(Class<?> sourceType, Class<?> targetType); |
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|
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/** |
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* Returns true if there might exist a conversion between the requested types (either an automatic JVM conversion, |
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* or one provided by any available {@link GuardingTypeConverterFactory}), or false if there definitely does not |
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* exist a conversion between the requested types. Note that returning true does not guarantee that the conversion |
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* will succeed at runtime (notably, if the "from" or "to" types are sufficiently generic), but returning false |
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* guarantees that it would fail. |
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* |
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* @param from the source type for the conversion |
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* @param to the target type for the conversion |
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* @return true if there can be a conversion, false if there can not. |
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*/ |
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public boolean canConvert(Class<?> from, Class<?> to); |
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|
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/** |
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* Creates a guarded invocation using the {@link DynamicLinker} that exposes this linker services interface. Linkers |
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* can typically use them to delegate linking of wrapped objects. |
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* |
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* @param linkRequest a request for linking the invocation |
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* @return a guarded invocation linked by the top-level linker (or any of its delegates). Can be null if no |
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* available linker is able to link the invocation. |
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* @throws Exception in case the top-level linker throws an exception |
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*/ |
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public GuardedInvocation getGuardedInvocation(LinkRequest linkRequest) throws Exception; |
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|
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/** |
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* Determines which of the two type conversions from a source type to the two target types is preferred. This is |
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* used for dynamic overloaded method resolution. If the source type is convertible to exactly one target type with |
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* a method invocation conversion, it is chosen, otherwise available {@link ConversionComparator}s are consulted. |
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* @param sourceType the source type. |
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* @param targetType1 one potential target type |
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* @param targetType2 another potential target type. |
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* @return one of Comparison constants that establish which - if any - of the target types is preferable for the |
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* conversion. |
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*/ |
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public Comparison compareConversion(Class<?> sourceType, Class<?> targetType1, Class<?> targetType2); |
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/** |
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* Modifies the method handle so that any parameters that can receive potentially internal language runtime objects |
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* will have a filter added on them to prevent them from escaping, potentially by wrapping them. |
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* It can also potentially add an unwrapping filter to the return value. Basically transforms the method |
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* handle using the transformer configured by {@link DynamicLinkerFactory#setInternalObjectsFilter(MethodHandleTransformer)}. |
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* @param target the target method handle |
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* @return a method handle with parameters and/or return type potentially filtered for wrapping and unwrapping. |
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*/ |
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public MethodHandle filterInternalObjects(final MethodHandle target); |
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} |