001/*
002 * #%L
003 * GwtMaterial
004 * %%
005 * Copyright (C) 2015 - 2017 GwtMaterialDesign
006 * %%
007 * Licensed under the Apache License, Version 2.0 (the "License");
008 * you may not use this file except in compliance with the License.
009 * You may obtain a copy of the License at
010 * 
011 *      http://www.apache.org/licenses/LICENSE-2.0
012 * 
013 * Unless required by applicable law or agreed to in writing, software
014 * distributed under the License is distributed on an "AS IS" BASIS,
015 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
016 * See the License for the specific language governing permissions and
017 * limitations under the License.
018 * #L%
019 */
020package gwt.material.design.client.data;
021
022import gwt.material.design.client.data.loader.LoadCallback;
023import gwt.material.design.client.data.loader.LoadConfig;
024import gwt.material.design.client.data.loader.LoadResult;
025
026import java.util.ArrayList;
027import java.util.List;
028import java.util.logging.Level;
029import java.util.logging.Logger;
030
031/**
032 * @author Ben Dol
033 */
034public class ListDataSource<T> implements DataSource<T> {
035
036    private Logger logger = Logger.getLogger(ListDataSource.class.getName());
037
038    private List<T> data;
039
040    public ListDataSource() {
041        data = new ArrayList<>();
042    }
043
044    public ListDataSource(List<T> data) {
045        this.data = data;
046    }
047
048    @Override
049    public void load(LoadConfig<T> loadConfig, LoadCallback<T> callback) {
050        try {
051            int size = loadConfig.getOffset() + loadConfig.getLimit();
052            if(size > data.size()){
053                size = data.size();
054            }
055            final List<T> subList = size == 0 ? new ArrayList<>() : data.subList(loadConfig.getOffset(), size);
056            callback.onSuccess(new LoadResult<>(subList, loadConfig.getOffset(), data.size(), cacheData()));
057        } catch (IndexOutOfBoundsException ex) {
058            // Silently ignore index out of bounds exceptions
059            logger.log(Level.FINE, "ListDataSource threw index out of bounds.", ex);
060            callback.onFailure(ex);
061        }
062    }
063
064    public void add(int startIndex, List<T> list) {
065        data.addAll(startIndex, list);
066    }
067
068    public void remove(List<T> list) {
069        data.removeAll(list);
070    }
071
072    public boolean cacheData() {
073        return true;
074    }
075
076    @Override
077    public boolean useRemoteSort() {
078        return false;
079    }
080}