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.resolve;
018    
019    import com.intellij.psi.PsiElement;
020    import org.jetbrains.annotations.NotNull;
021    import org.jetbrains.kotlin.descriptors.DeclarationDescriptor;
022    import org.jetbrains.kotlin.resolve.scopes.RedeclarationHandler;
023    
024    import static org.jetbrains.kotlin.diagnostics.Errors.REDECLARATION;
025    
026    public class TraceBasedRedeclarationHandler implements RedeclarationHandler {
027        private final BindingTrace trace;
028    
029        public TraceBasedRedeclarationHandler(@NotNull BindingTrace trace) {
030            this.trace = trace;
031        }
032        
033        @Override
034        public void handleRedeclaration(@NotNull DeclarationDescriptor first, @NotNull DeclarationDescriptor second) {
035            report(first);
036            report(second);
037        }
038    
039        private void report(DeclarationDescriptor descriptor) {
040            PsiElement firstElement = DescriptorToSourceUtils.descriptorToDeclaration(descriptor);
041            if (firstElement != null) {
042                trace.report(REDECLARATION.on(firstElement, descriptor.getName().asString()));
043            }
044            else {
045                throw new IllegalStateException("No declaration found for " + descriptor);
046            }
047        }
048    }