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.util.slicedmap;
018
019import java.util.Collection;
020import java.util.Collections;
021import java.util.Iterator;
022import java.util.Map;
023
024public interface SlicedMap extends Iterable<Map.Entry<SlicedMapKey<?, ?>, ?>> {
025
026    SlicedMap DO_NOTHING = new SlicedMap() {
027        @Override
028        public <K, V> V get(ReadOnlySlice<K, V> slice, K key) {
029            return slice.computeValue(this, key, null, true);
030        }
031
032        @Override
033        public <K, V> Collection<K> getKeys(WritableSlice<K, V> slice) {
034            return Collections.emptySet();
035        }
036
037        @Override
038        public Iterator<Map.Entry<SlicedMapKey<?, ?>, ?>> iterator() {
039            return Collections.<Map.Entry<SlicedMapKey<?, ?>, ?>>emptySet().iterator();
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}