author | sundar |
Mon, 13 Oct 2014 23:38:49 +0530 | |
changeset 27099 | eceb216332cb |
parent 26651 | c04136234037 |
child 27367 | 47c1c541f45d |
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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package jdk.nashorn.internal.runtime.linker; |
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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 jdk.internal.dynalink.beans.BeansLinker; |
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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.GuardingDynamicLinker; |
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import jdk.internal.dynalink.linker.LinkRequest; |
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import jdk.internal.dynalink.linker.LinkerServices; |
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import jdk.internal.dynalink.support.Lookup; |
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import jdk.nashorn.api.scripting.ScriptUtils; |
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import jdk.nashorn.internal.objects.NativeArray; |
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import jdk.nashorn.internal.runtime.ConsString; |
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import jdk.nashorn.internal.runtime.ScriptObject; |
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import jdk.nashorn.internal.runtime.options.Options; |
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/** |
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* This linker delegates to a {@code BeansLinker} but passes it a special linker services object that has a modified |
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* {@code asType} method that will ensure that we never pass internal engine objects that should not be externally |
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* observable (currently ConsString and ScriptObject) to Java APIs, but rather that we flatten it into a String. We can't just add |
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* this functionality as custom converters via {@code GuaardingTypeConverterFactory}, since they are not consulted when |
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* the target method handle parameter signature is {@code Object}. |
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*/ |
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public class NashornBeansLinker implements GuardingDynamicLinker { |
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// System property to control whether to wrap ScriptObject->ScriptObjectMirror for |
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// Object type arguments of Java method calls, field set and array set. |
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private static final boolean MIRROR_ALWAYS = Options.getBooleanProperty("nashorn.mirror.always", true); |
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private static final MethodHandle EXPORT_ARGUMENT = new Lookup(MethodHandles.lookup()).findOwnStatic("exportArgument", Object.class, Object.class); |
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private static final MethodHandle EXPORT_NATIVE_ARRAY = new Lookup(MethodHandles.lookup()).findOwnStatic("exportNativeArray", Object.class, NativeArray.class); |
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private static final MethodHandle EXPORT_SCRIPT_OBJECT = new Lookup(MethodHandles.lookup()).findOwnStatic("exportScriptObject", Object.class, ScriptObject.class); |
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private static final MethodHandle IMPORT_RESULT = new Lookup(MethodHandles.lookup()).findOwnStatic("importResult", Object.class, Object.class); |
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private final BeansLinker beansLinker = new BeansLinker(); |
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@Override |
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public GuardedInvocation getGuardedInvocation(final LinkRequest linkRequest, final LinkerServices linkerServices) throws Exception { |
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return getGuardedInvocation(beansLinker, linkRequest, linkerServices); |
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} |
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/** |
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* Delegates to the specified linker but injects its linker services wrapper so that it will apply all special |
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* conversions that this class does. |
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* @param delegateLinker the linker to which the actual work is delegated to. |
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* @param linkRequest the delegated link request |
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* @param linkerServices the original link services that will be augmented with special conversions |
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* @return the guarded invocation from the delegate, possibly augmented with special conversions |
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* @throws Exception if the delegate throws an exception |
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*/ |
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public static GuardedInvocation getGuardedInvocation(final GuardingDynamicLinker delegateLinker, final LinkRequest linkRequest, final LinkerServices linkerServices) throws Exception { |
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return delegateLinker.getGuardedInvocation(linkRequest, new NashornBeansLinkerServices(linkerServices)); |
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} |
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@SuppressWarnings("unused") |
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private static Object exportArgument(final Object arg) { |
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return exportArgument(arg, MIRROR_ALWAYS); |
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} |
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@SuppressWarnings("unused") |
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private static Object exportNativeArray(final NativeArray arg) { |
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return exportArgument(arg, MIRROR_ALWAYS); |
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} |
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@SuppressWarnings("unused") |
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private static Object exportScriptObject(final ScriptObject arg) { |
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return exportArgument(arg, MIRROR_ALWAYS); |
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} |
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@SuppressWarnings("unused") |
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private static Object exportScriptArray(final NativeArray arg) { |
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return exportArgument(arg, MIRROR_ALWAYS); |
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} |
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static Object exportArgument(final Object arg, final boolean mirrorAlways) { |
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if (arg instanceof ConsString) { |
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return arg.toString(); |
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} else if (mirrorAlways && arg instanceof ScriptObject) { |
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return ScriptUtils.wrap((ScriptObject)arg); |
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} else { |
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return arg; |
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} |
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} |
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@SuppressWarnings("unused") |
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private static Object importResult(final Object arg) { |
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return ScriptUtils.unwrap(arg); |
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} |
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private static class NashornBeansLinkerServices implements LinkerServices { |
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private final LinkerServices linkerServices; |
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NashornBeansLinkerServices(final LinkerServices linkerServices) { |
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this.linkerServices = linkerServices; |
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} |
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@Override |
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public MethodHandle asType(final MethodHandle handle, final MethodType fromType) { |
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final MethodType handleType = handle.type(); |
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final int paramCount = handleType.parameterCount(); |
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assert fromType.parameterCount() == handleType.parameterCount(); |
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MethodType newFromType = fromType; |
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MethodHandle[] filters = null; |
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for(int i = 0; i < paramCount; ++i) { |
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final MethodHandle filter = argConversionFilter(handleType.parameterType(i), fromType.parameterType(i)); |
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if (filter != null) { |
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if (filters == null) { |
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filters = new MethodHandle[paramCount]; |
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} |
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// "erase" specific type with Object type or else we'll get filter mismatch |
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newFromType = newFromType.changeParameterType(i, Object.class); |
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filters[i] = filter; |
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} |
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} |
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final MethodHandle typed = linkerServices.asType(handle, newFromType); |
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MethodHandle result = filters != null ? MethodHandles.filterArguments(typed, 0, filters) : typed; |
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// Filter Object typed return value for possible ScriptObjectMirror. We convert |
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// ScriptObjectMirror as ScriptObject (if it is mirror from current global). |
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if (MIRROR_ALWAYS && areBothObjects(handleType.returnType(), fromType.returnType())) { |
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result = MethodHandles.filterReturnValue(result, IMPORT_RESULT); |
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} |
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|
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return result; |
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} |
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|
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private static MethodHandle argConversionFilter(final Class<?> handleType, final Class<?> fromType) { |
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if (handleType == Object.class) { |
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if (fromType == Object.class) { |
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return EXPORT_ARGUMENT; |
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} else if (fromType == NativeArray.class) { |
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return EXPORT_NATIVE_ARRAY; |
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} else if (fromType == ScriptObject.class) { |
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return EXPORT_SCRIPT_OBJECT; |
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} |
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} |
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return null; |
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} |
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|
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private static boolean areBothObjects(final Class<?> handleType, final Class<?> fromType) { |
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return handleType == Object.class && fromType == Object.class; |
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} |
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|
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@Override |
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public MethodHandle asTypeLosslessReturn(final MethodHandle handle, final MethodType fromType) { |
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return Implementation.asTypeLosslessReturn(this, handle, fromType); |
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} |
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||
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@Override |
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public MethodHandle getTypeConverter(final Class<?> sourceType, final Class<?> targetType) { |
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return linkerServices.getTypeConverter(sourceType, targetType); |
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} |
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|
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@Override |
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public boolean canConvert(final Class<?> from, final Class<?> to) { |
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return linkerServices.canConvert(from, to); |
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} |
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|
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@Override |
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public GuardedInvocation getGuardedInvocation(final LinkRequest linkRequest) throws Exception { |
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return linkerServices.getGuardedInvocation(linkRequest); |
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} |
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@Override |
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public Comparison compareConversion(final Class<?> sourceType, final Class<?> targetType1, final Class<?> targetType2) { |
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if (sourceType == ConsString.class) { |
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if (String.class == targetType1 || CharSequence.class == targetType1) { |
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return Comparison.TYPE_1_BETTER; |
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} |
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|
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if (String.class == targetType2 || CharSequence.class == targetType2) { |
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return Comparison.TYPE_2_BETTER; |
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} |
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} |
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return linkerServices.compareConversion(sourceType, targetType1, targetType2); |
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} |
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} |
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} |