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.calls.autocasts;
018
019import com.google.common.collect.ImmutableMap;
020import org.jetbrains.annotations.NotNull;
021import org.jetbrains.jet.lang.types.JetType;
022
023import java.util.Set;
024
025public 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}