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 org.jetbrains.annotations.NotNull;
020    import org.jetbrains.jet.lang.types.lang.KotlinBuiltIns;
021    import org.jetbrains.jet.lang.types.JetType;
022    
023    public class DataFlowValue {
024        
025        public static final DataFlowValue NULL = new DataFlowValue(new Object(), KotlinBuiltIns.getInstance().getNullableNothingType(), false, Nullability.NULL);
026        public static final DataFlowValue NULLABLE = new DataFlowValue(new Object(), KotlinBuiltIns.getInstance().getNullableAnyType(), false, Nullability.UNKNOWN);
027    
028        private final boolean stableIdentifier;
029        private final JetType type;
030        private final Object id;
031        private final Nullability immanentNullability;
032    
033        // Use DataFlowValueFactory
034        /*package*/ DataFlowValue(Object id, JetType type, boolean stableIdentifier, Nullability immanentNullability) {
035            this.stableIdentifier = stableIdentifier;
036            this.type = type;
037            this.id = id;
038            this.immanentNullability = immanentNullability;
039        }
040    
041        @NotNull
042        public Nullability getImmanentNullability() {
043            return immanentNullability;
044        }
045    
046        /**
047         * Stable identifier is a non-literal value that is statically known to be immutable
048         * @return
049         */
050        public boolean isStableIdentifier() {
051            return stableIdentifier;
052        }
053    
054        @NotNull
055        public JetType getType() {
056            return type;
057        }
058    
059        @Override
060        public boolean equals(Object o) {
061            if (this == o) return true;
062            if (o == null || getClass() != o.getClass()) return false;
063    
064            DataFlowValue that = (DataFlowValue) o;
065    
066            if (stableIdentifier != that.stableIdentifier) return false;
067            if (id != null ? !id.equals(that.id) : that.id != null) return false;
068            if (type != null ? !type.equals(that.type) : that.type != null) return false;
069    
070            return true;
071        }
072    
073        @Override
074        public String toString() {
075            return (stableIdentifier ? "stable " : "unstable ") + (id == null ? null : id.toString()) + " " + immanentNullability;
076        }
077    
078        @Override
079        public int hashCode() {
080            int result = (stableIdentifier ? 1 : 0);
081            result = 31 * result + (type != null ? type.hashCode() : 0);
082            result = 31 * result + (id != null ? id.hashCode() : 0);
083            return result;
084        }
085    }