001    /*
002     * Copyright 2010-2015 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.kotlin.codegen;
018    
019    import org.jetbrains.annotations.NotNull;
020    import org.jetbrains.annotations.Nullable;
021    import org.jetbrains.kotlin.descriptors.CallableMemberDescriptor;
022    import org.jetbrains.kotlin.descriptors.FunctionDescriptor;
023    import org.jetbrains.kotlin.load.java.descriptors.SamAdapterDescriptor;
024    
025    public class SamCodegenUtil {
026        @Nullable
027        public static FunctionDescriptor getOriginalIfSamAdapter(@NotNull FunctionDescriptor fun) {
028            FunctionDescriptor original = fun.getOriginal();
029            if (original instanceof SamAdapterDescriptor<?>) {
030                return ((SamAdapterDescriptor<?>) original).getOriginForSam();
031            }
032    
033            if (original.getKind() == CallableMemberDescriptor.Kind.FAKE_OVERRIDE) {
034                for (FunctionDescriptor overridden : original.getOverriddenDescriptors()) {
035                    FunctionDescriptor originalIfSamAdapter = getOriginalIfSamAdapter(overridden);
036                    if (originalIfSamAdapter != null) {
037                        return originalIfSamAdapter;
038                    }
039                }
040            }
041    
042            return null;
043        }
044    
045        public static <T extends FunctionDescriptor> T resolveSamAdapter(@NotNull T descriptor) {
046            FunctionDescriptor original = getOriginalIfSamAdapter(descriptor);
047            return original != null ? (T) original : descriptor;
048        }
049    
050        private SamCodegenUtil() {
051        }
052    }