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.lang.resolve.scopes;
018    
019    import org.jetbrains.annotations.NotNull;
020    import org.jetbrains.jet.lang.descriptors.DeclarationDescriptor;
021    
022    public interface RedeclarationHandler {
023        RedeclarationHandler DO_NOTHING = new RedeclarationHandler() {
024            @Override
025            public void handleRedeclaration(@NotNull DeclarationDescriptor first, @NotNull DeclarationDescriptor second) {
026            }
027        };
028        RedeclarationHandler THROW_EXCEPTION = new RedeclarationHandler() {
029            @Override
030            public void handleRedeclaration(@NotNull DeclarationDescriptor first, @NotNull DeclarationDescriptor second) {
031                throw new IllegalStateException("Redeclaration: " + first + " and " + second + "(no line info available)");
032            }
033        };
034    
035        void handleRedeclaration(@NotNull DeclarationDescriptor first, @NotNull DeclarationDescriptor second);
036    }