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.constants;
018
019import org.jetbrains.annotations.NotNull;
020import org.jetbrains.jet.lang.descriptors.annotations.AnnotationArgumentVisitor;
021import org.jetbrains.jet.lang.types.lang.KotlinBuiltIns;
022import org.jetbrains.jet.lang.types.JetType;
023
024public class NullValue implements CompileTimeConstant<Void> {
025
026    public static final NullValue NULL = new NullValue();
027
028    private NullValue() {
029    }
030
031    @Override
032    public Void getValue() {
033        return null;
034    }
035
036    @NotNull
037    @Override
038    public JetType getType(@NotNull KotlinBuiltIns kotlinBuiltIns) {
039        return KotlinBuiltIns.getInstance().getNullableNothingType();
040    }
041
042    @Override
043    public <R, D> R accept(AnnotationArgumentVisitor<R, D> visitor, D data) {
044        return visitor.visitNullValue(this, data);
045    }
046
047    @Override
048    public String toString() {
049        return "null";
050    }
051}