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.calls.autocasts;
018    
019    import com.google.common.collect.ImmutableMap;
020    import org.jetbrains.annotations.NotNull;
021    import org.jetbrains.jet.lang.types.JetType;
022    
023    import java.util.Set;
024    
025    public interface DataFlowInfo {
026        DataFlowInfo EMPTY = new DelegatingDataFlowInfo(null, ImmutableMap.<DataFlowValue, Nullability>of(),
027                                                        DelegatingDataFlowInfo.newTypeInfo());
028    
029        @NotNull
030        Nullability getNullability(@NotNull DataFlowValue key);
031    
032        @NotNull
033        Set<JetType> getPossibleTypes(@NotNull DataFlowValue key);
034    
035        @NotNull
036        DataFlowInfo equate(@NotNull DataFlowValue a, @NotNull DataFlowValue b);
037    
038        @NotNull
039        DataFlowInfo disequate(@NotNull DataFlowValue a, @NotNull DataFlowValue b);
040    
041        @NotNull
042        DataFlowInfo establishSubtyping(@NotNull DataFlowValue value, @NotNull JetType type);
043    
044        @NotNull
045        DataFlowInfo and(@NotNull DataFlowInfo other);
046    
047        @NotNull
048        DataFlowInfo or(@NotNull DataFlowInfo other);
049    
050        boolean hasTypeInfoConstraints();
051    }