author | attila |
Mon, 18 Feb 2013 16:00:15 +0100 | |
changeset 16245 | 6a1c6c8bc113 |
parent 16234 | 86cb162cec6c |
child 19455 | b972b61a6921 |
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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|
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package jdk.internal.dynalink.support; |
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|
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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 java.lang.invoke.WrongMethodTypeException; |
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import java.util.LinkedList; |
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import java.util.List; |
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import jdk.internal.dynalink.linker.ConversionComparator; |
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import jdk.internal.dynalink.linker.ConversionComparator.Comparison; |
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import jdk.internal.dynalink.linker.GuardedInvocation; |
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import jdk.internal.dynalink.linker.GuardingTypeConverterFactory; |
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import jdk.internal.dynalink.linker.LinkerServices; |
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|
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/** |
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* A factory for type converters. This class is the main implementation behind the |
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* {@link LinkerServices#asType(MethodHandle, MethodType)}. It manages the known {@link GuardingTypeConverterFactory} |
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* instances and creates appropriate converters for method handles. |
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* |
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* @author Attila Szegedi |
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*/ |
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public class TypeConverterFactory { |
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|
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private final GuardingTypeConverterFactory[] factories; |
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private final ConversionComparator[] comparators; |
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|
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private final ClassValue<ClassMap<MethodHandle>> converterMap = new ClassValue<ClassMap<MethodHandle>>() { |
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@Override |
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protected ClassMap<MethodHandle> computeValue(final Class<?> sourceType) { |
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return new ClassMap<MethodHandle>(sourceType.getClassLoader()) { |
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@Override |
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protected MethodHandle computeValue(Class<?> targetType) { |
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try { |
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return createConverter(sourceType, targetType); |
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} catch (RuntimeException e) { |
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throw e; |
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} catch (Exception e) { |
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throw new RuntimeException(e); |
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} |
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} |
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}; |
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} |
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}; |
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|
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private final ClassValue<ClassMap<MethodHandle>> converterIdentityMap = new ClassValue<ClassMap<MethodHandle>>() { |
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@Override |
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protected ClassMap<MethodHandle> computeValue(final Class<?> sourceType) { |
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return new ClassMap<MethodHandle>(sourceType.getClassLoader()) { |
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@Override |
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protected MethodHandle computeValue(Class<?> targetType) { |
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if(!canAutoConvert(sourceType, targetType)) { |
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final MethodHandle converter = getTypeConverterNull(sourceType, targetType); |
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if(converter != null) { |
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return converter; |
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} |
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} |
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return IDENTITY_CONVERSION.asType(MethodType.methodType(targetType, sourceType)); |
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} |
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}; |
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} |
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}; |
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|
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/** |
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* Creates a new type converter factory from the available {@link GuardingTypeConverterFactory} instances. |
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* |
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* @param factories the {@link GuardingTypeConverterFactory} instances to compose. |
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*/ |
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public TypeConverterFactory(Iterable<? extends GuardingTypeConverterFactory> factories) { |
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final List<GuardingTypeConverterFactory> l = new LinkedList<>(); |
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final List<ConversionComparator> c = new LinkedList<>(); |
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for(GuardingTypeConverterFactory factory: factories) { |
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l.add(factory); |
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if(factory instanceof ConversionComparator) { |
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c.add((ConversionComparator)factory); |
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} |
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} |
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this.factories = l.toArray(new GuardingTypeConverterFactory[l.size()]); |
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this.comparators = c.toArray(new ConversionComparator[c.size()]); |
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|
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} |
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164 |
|
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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)} 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 MethodHandle asType(MethodHandle handle, final MethodType fromType) { |
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MethodHandle newHandle = handle; |
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final MethodType toType = newHandle.type(); |
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final int l = toType.parameterCount(); |
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if(l != fromType.parameterCount()) { |
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throw new WrongMethodTypeException("Parameter counts differ: " + handle.type() + " vs. " + fromType); |
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185 |
} |
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int pos = 0; |
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final List<MethodHandle> converters = new LinkedList<>(); |
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for(int i = 0; i < l; ++i) { |
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final Class<?> fromParamType = fromType.parameterType(i); |
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final Class<?> toParamType = toType.parameterType(i); |
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if(canAutoConvert(fromParamType, toParamType)) { |
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newHandle = applyConverters(newHandle, pos, converters); |
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} else { |
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final MethodHandle converter = getTypeConverterNull(fromParamType, toParamType); |
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195 |
if(converter != null) { |
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196 |
if(converters.isEmpty()) { |
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pos = i; |
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198 |
} |
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converters.add(converter); |
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200 |
} else { |
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newHandle = applyConverters(newHandle, pos, converters); |
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202 |
} |
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203 |
} |
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204 |
} |
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newHandle = applyConverters(newHandle, pos, converters); |
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206 |
|
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// Convert return type |
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final Class<?> fromRetType = fromType.returnType(); |
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final Class<?> toRetType = toType.returnType(); |
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if(fromRetType != Void.TYPE && toRetType != Void.TYPE) { |
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if(!canAutoConvert(toRetType, fromRetType)) { |
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final MethodHandle converter = getTypeConverterNull(toRetType, fromRetType); |
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if(converter != null) { |
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newHandle = MethodHandles.filterReturnValue(newHandle, converter); |
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215 |
} |
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216 |
} |
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} |
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218 |
|
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// Take care of automatic conversions |
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220 |
return newHandle.asType(fromType); |
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221 |
} |
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222 |
|
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private static MethodHandle applyConverters(MethodHandle handle, int pos, List<MethodHandle> converters) { |
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224 |
if(converters.isEmpty()) { |
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225 |
return handle; |
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226 |
} |
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final MethodHandle newHandle = |
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MethodHandles.filterArguments(handle, pos, converters.toArray(new MethodHandle[converters.size()])); |
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229 |
converters.clear(); |
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230 |
return newHandle; |
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231 |
} |
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232 |
|
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233 |
/** |
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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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239 |
* |
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* @param from the source type for the conversion |
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241 |
* @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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243 |
*/ |
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244 |
public boolean canConvert(final Class<?> from, final Class<?> to) { |
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return canAutoConvert(from, to) || getTypeConverterNull(from, to) != null; |
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246 |
} |
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247 |
|
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248 |
/** |
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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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253 |
* @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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257 |
*/ |
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258 |
public Comparison compareConversion(Class<?> sourceType, Class<?> targetType1, Class<?> targetType2) { |
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for(ConversionComparator comparator: comparators) { |
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final Comparison result = comparator.compareConversion(sourceType, targetType1, targetType2); |
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if(result != Comparison.INDETERMINATE) { |
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return result; |
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} |
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} |
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if(TypeUtilities.isMethodInvocationConvertible(sourceType, targetType1)) { |
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if(!TypeUtilities.isMethodInvocationConvertible(sourceType, targetType2)) { |
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return Comparison.TYPE_1_BETTER; |
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} |
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} else if(TypeUtilities.isMethodInvocationConvertible(sourceType, targetType2)) { |
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return Comparison.TYPE_2_BETTER; |
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} |
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return Comparison.INDETERMINATE; |
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} |
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|
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/** |
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* Determines whether it's safe to perform an automatic conversion between the source and target class. |
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* |
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* @param fromType convert from this class |
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* @param toType convert to this class |
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* @return true if it's safe to let MethodHandles.convertArguments() to handle this conversion. |
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*/ |
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/*private*/ static boolean canAutoConvert(final Class<?> fromType, final Class<?> toType) { |
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return TypeUtilities.isMethodInvocationConvertible(fromType, toType); |
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} |
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|
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/*private*/ MethodHandle getTypeConverterNull(Class<?> sourceType, Class<?> targetType) { |
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final MethodHandle converter = converterMap.get(sourceType).get(targetType); |
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return converter == IDENTITY_CONVERSION ? null : converter; |
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} |
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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 can use this method |
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* if you have a piece of your program that is written in Java, and you need to reuse existing type conversion |
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* 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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return converterIdentityMap.get(sourceType).get(targetType); |
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} |
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|
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/*private*/ MethodHandle createConverter(Class<?> sourceType, Class<?> targetType) throws Exception { |
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final MethodType type = MethodType.methodType(targetType, sourceType); |
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final MethodHandle identity = IDENTITY_CONVERSION.asType(type); |
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MethodHandle last = identity; |
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for(int i = factories.length; i-- > 0;) { |
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final GuardedInvocation next = factories[i].convertToType(sourceType, targetType); |
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if(next != null) { |
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next.assertType(type); |
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last = next.compose(last); |
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} |
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} |
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return last == identity ? IDENTITY_CONVERSION : last; |
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} |
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|
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/*private*/ static final MethodHandle IDENTITY_CONVERSION = MethodHandles.identity(Object.class); |
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} |