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.util.slicedMap;
018    
019    import kotlin.jvm.functions.Function3;
020    import org.jetbrains.annotations.NotNull;
021    
022    import java.util.Collection;
023    import java.util.Collections;
024    
025    public interface SlicedMap {
026    
027        SlicedMap DO_NOTHING = new SlicedMap() {
028            @Override
029            public <K, V> V get(ReadOnlySlice<K, V> slice, K key) {
030                return slice.computeValue(this, key, null, true);
031            }
032    
033            @Override
034            public <K, V> Collection<K> getKeys(WritableSlice<K, V> slice) {
035                return Collections.emptySet();
036            }
037    
038            @Override
039            public void forEach(@NotNull Function3<WritableSlice, Object, Object, Void> f) {
040            }
041        };
042    
043        <K, V> V get(ReadOnlySlice<K, V> slice, K key);
044    
045        // slice.isCollective() must return true
046        <K, V> Collection<K> getKeys(WritableSlice<K, V> slice);
047    
048        void forEach(@NotNull Function3<WritableSlice, Object, Object, Void> f);
049    }