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
019public interface RewritePolicy {
020
021    RewritePolicy DO_NOTHING = new RewritePolicy() {
022        @Override
023        public <K> boolean rewriteProcessingNeeded(K key) {
024            return false;
025        }
026
027        @Override
028        public <K, V> boolean processRewrite(WritableSlice<K, V> slice, K key, V oldValue, V newValue) {
029            throw new UnsupportedOperationException();
030        }
031    };
032
033    <K> boolean rewriteProcessingNeeded(K key);
034
035    // True to put, false to skip
036    <K, V> boolean processRewrite(WritableSlice<K, V> slice, K key, V oldValue, V newValue);
037}