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.CallableMemberDescriptor;
022    import org.jetbrains.kotlin.descriptors.DeclarationDescriptor;
023    import org.jetbrains.kotlin.resolve.scopes.RedeclarationHandler;
024    
025    import static org.jetbrains.kotlin.diagnostics.Errors.CONFLICTING_OVERLOADS;
026    import static org.jetbrains.kotlin.diagnostics.Errors.REDECLARATION;
027    
028    public class TraceBasedRedeclarationHandler implements RedeclarationHandler {
029        private final BindingTrace trace;
030    
031        public TraceBasedRedeclarationHandler(@NotNull BindingTrace trace) {
032            this.trace = trace;
033        }
034        
035        @Override
036        public void handleRedeclaration(@NotNull DeclarationDescriptor first, @NotNull DeclarationDescriptor second) {
037            reportRedeclaration(first);
038            reportRedeclaration(second);
039        }
040    
041        @Override
042        public void handleConflictingOverloads(@NotNull CallableMemberDescriptor first, @NotNull CallableMemberDescriptor second) {
043            reportConflictingOverloads(first, second.getContainingDeclaration());
044            reportConflictingOverloads(second, first.getContainingDeclaration());
045        }
046    
047        private void reportConflictingOverloads(CallableMemberDescriptor conflicting, DeclarationDescriptor withContainedIn) {
048            PsiElement reportElement = DescriptorToSourceUtils.descriptorToDeclaration(conflicting);
049            if (reportElement != null) {
050                trace.report(CONFLICTING_OVERLOADS.on(reportElement, conflicting, withContainedIn));
051            }
052            else {
053                throw new IllegalStateException("No declaration found for " + conflicting);
054            }
055        }
056    
057        private void reportRedeclaration(DeclarationDescriptor descriptor) {
058            PsiElement firstElement = DescriptorToSourceUtils.descriptorToDeclaration(descriptor);
059            if (firstElement != null) {
060                trace.report(REDECLARATION.on(firstElement, descriptor.getName().asString()));
061            }
062            else {
063                throw new IllegalStateException("No declaration found for " + descriptor);
064            }
065        }
066    }