001    /*
002     * Copyright 2010-2013 JetBrains s.r.o.
003     *
004     * Licensed under the Apache License, Version 2.0 (the "License");
005     * you may not use this file except in compliance with the License.
006     * You may obtain a copy of the License at
007     *
008     * http://www.apache.org/licenses/LICENSE-2.0
009     *
010     * Unless required by applicable law or agreed to in writing, software
011     * distributed under the License is distributed on an "AS IS" BASIS,
012     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013     * See the License for the specific language governing permissions and
014     * limitations under the License.
015     */
016    
017    package org.jetbrains.jet.codegen;
018    
019    import org.jetbrains.annotations.NotNull;
020    import org.jetbrains.annotations.Nullable;
021    import org.jetbrains.jet.lang.descriptors.CallableDescriptor;
022    import org.jetbrains.jet.lang.descriptors.CallableMemberDescriptor;
023    import org.jetbrains.jet.lang.descriptors.FunctionDescriptor;
024    import org.jetbrains.jet.lang.resolve.BindingContext;
025    import org.jetbrains.jet.lang.resolve.java.JavaBindingContext;
026    
027    public class SamCodegenUtil {
028        @Nullable
029        public static FunctionDescriptor getOriginalIfSamAdapter(@NotNull BindingContext bindingContext, @NotNull CallableDescriptor fun) {
030            if (!(fun instanceof FunctionDescriptor)) {
031                return null;
032            }
033            FunctionDescriptor original = ((FunctionDescriptor) fun).getOriginal();
034            if (original.getKind() == CallableMemberDescriptor.Kind.SYNTHESIZED) {
035                return bindingContext.get(JavaBindingContext.SAM_ADAPTER_FUNCTION_TO_ORIGINAL, original);
036            }
037            if (original.getKind() == CallableMemberDescriptor.Kind.FAKE_OVERRIDE) {
038                for (FunctionDescriptor overridden : original.getOverriddenDescriptors()) {
039                    FunctionDescriptor originalIfSamAdapter = getOriginalIfSamAdapter(bindingContext, overridden);
040                    if (originalIfSamAdapter != null) {
041                        return originalIfSamAdapter;
042                    }
043                }
044            }
045            return null;
046        }
047    
048        private SamCodegenUtil() {
049        }
050    }