001    /*
002     * Copyright 2010-2015 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.kotlin.resolve.constants;
018    
019    import org.jetbrains.annotations.NotNull;
020    import org.jetbrains.kotlin.builtins.KotlinBuiltIns;
021    import org.jetbrains.kotlin.descriptors.annotations.AnnotationArgumentVisitor;
022    import org.jetbrains.kotlin.types.JetType;
023    
024    public class NullValue extends CompileTimeConstant<Void> {
025    
026        public static final NullValue NULL = new NullValue();
027    
028        private NullValue() {
029            super(null, false, false, false);
030        }
031    
032        @NotNull
033        @Override
034        public JetType getType(@NotNull KotlinBuiltIns kotlinBuiltIns) {
035            return KotlinBuiltIns.getInstance().getNullableNothingType();
036        }
037    
038        @Override
039        public <R, D> R accept(AnnotationArgumentVisitor<R, D> visitor, D data) {
040            return visitor.visitNullValue(this, data);
041        }
042    
043        @Override
044        public String toString() {
045            return "null";
046        }
047    }