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.constants;
018    
019    import org.jetbrains.annotations.NotNull;
020    import org.jetbrains.annotations.Nullable;
021    import org.jetbrains.jet.lang.descriptors.annotations.AnnotationArgumentVisitor;
022    import org.jetbrains.jet.lang.types.JetType;
023    import org.jetbrains.jet.lang.types.lang.KotlinBuiltIns;
024    
025    public abstract class CompileTimeConstant<T> {
026        protected final T value;
027        private final boolean canBeUsedInAnnotations;
028        // if false = constant type cannot be changed, ex. val a: Long = 1.toInt() (should be a TYPE_MISMATCH error, 1.toInt() isn't pure)
029        private final boolean isPure;
030    
031        protected CompileTimeConstant(T value, boolean canBeUsedInAnnotations, boolean pure) {
032            this.value = value;
033            this.canBeUsedInAnnotations = canBeUsedInAnnotations;
034            this.isPure = pure;
035        }
036    
037        public boolean canBeUsedInAnnotations() {
038            return canBeUsedInAnnotations;
039        }
040    
041        public boolean isPure() {
042            return isPure;
043        }
044    
045        @Nullable
046        public T getValue() {
047            return value;
048        }
049    
050        @NotNull
051        public abstract JetType getType(@NotNull KotlinBuiltIns kotlinBuiltIns);
052    
053        public abstract <R, D> R accept(AnnotationArgumentVisitor<R, D> visitor, D data);
054    }