001/**
002 * Copyright (c) 2011, The University of Southampton and the individual contributors.
003 * All rights reserved.
004 *
005 * Redistribution and use in source and binary forms, with or without modification,
006 * are permitted provided that the following conditions are met:
007 *
008 *   *  Redistributions of source code must retain the above copyright notice,
009 *      this list of conditions and the following disclaimer.
010 *
011 *   *  Redistributions in binary form must reproduce the above copyright notice,
012 *      this list of conditions and the following disclaimer in the documentation
013 *      and/or other materials provided with the distribution.
014 *
015 *   *  Neither the name of the University of Southampton nor the names of its
016 *      contributors may be used to endorse or promote products derived from this
017 *      software without specific prior written permission.
018 *
019 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
020 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
021 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
022 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
023 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
024 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
025 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
026 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
027 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
028 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
029 */
030package org.openimaj.data.dataset.cache;
031
032import java.util.Collection;
033
034import org.openimaj.data.dataset.GroupedDataset;
035import org.openimaj.data.dataset.ListBackedDataset;
036import org.openimaj.data.dataset.ListDataset;
037import org.openimaj.data.dataset.MapBackedDataset;
038
039/**
040 * In-memory implementation of a {@link GroupedListCache}
041 * 
042 * @author Jonathon Hare (jsh2@ecs.soton.ac.uk)
043 *  
044 * @param <OBJECT> Type of instances
045 * @param <KEY> Type of groups
046 */
047public class InMemoryGroupedListCache<KEY, OBJECT> implements GroupedListCache<KEY, OBJECT> {
048        MapBackedDataset<KEY, ListDataset<OBJECT>, OBJECT> dataset = new MapBackedDataset<KEY, ListDataset<OBJECT>, OBJECT>();
049
050        @Override
051        public void add(Collection<KEY> keys, OBJECT object) {
052                for (KEY key : keys) {
053                        ListBackedDataset<OBJECT> list = (ListBackedDataset<OBJECT>) dataset.getInstances(key);
054                        if (list == null) dataset.getMap().put(key, list = new ListBackedDataset<OBJECT>());
055                        
056                        list.add(object);
057                }
058        }
059
060        @Override
061        public void add(KEY key, OBJECT object) {
062                ListBackedDataset<OBJECT> list = (ListBackedDataset<OBJECT>) dataset.getInstances(key);
063                if (list == null) dataset.getMap().put(key, list = new ListBackedDataset<OBJECT>());
064                
065                list.add(object);
066        }
067
068        @Override
069        public void add(KEY key, Collection<OBJECT> objects) {
070                ListBackedDataset<OBJECT> list = (ListBackedDataset<OBJECT>) dataset.getInstances(key);
071                if (list == null) dataset.getMap().put(key, list = new ListBackedDataset<OBJECT>());
072                
073                for (OBJECT object : objects)
074                        list.add(object);
075        }
076
077        @Override
078        public GroupedDataset<KEY, ListDataset<OBJECT>, OBJECT> getDataset() {
079                return dataset;
080        }
081
082        @Override
083        public void reset() {
084                dataset.getMap().clear();
085        }
086}