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
017package org.jetbrains.jet.lang.resolve;
018
019import com.intellij.psi.PsiElement;
020import org.jetbrains.annotations.NotNull;
021import org.jetbrains.jet.lang.descriptors.DeclarationDescriptor;
022import org.jetbrains.jet.lang.resolve.scopes.RedeclarationHandler;
023
024import static org.jetbrains.jet.lang.diagnostics.Errors.REDECLARATION;
025
026public 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 = BindingContextUtils.descriptorToDeclaration(trace.getBindingContext(), 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}