001/*
002 * Copyright 2020 Global Biodiversity Information Facility (GBIF)
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 */
016package org.gbif.api.util.iterables;
017
018import org.gbif.api.model.common.paging.PagingRequest;
019import org.gbif.api.model.common.paging.PagingResponse;
020import org.gbif.api.model.registry.Dataset;
021import org.gbif.api.service.registry.DatasetService;
022import org.gbif.api.vocabulary.DatasetType;
023
024import javax.annotation.Nullable;
025
026/**
027 * Pages through all datasets filtering by type only.
028 */
029public class DatasetPager extends DatasetBasePager {
030
031    private final DatasetService ds;
032    private final DatasetType type;
033
034    public DatasetPager(DatasetService ds, @Nullable DatasetType type, int pageSize) {
035        super(type, pageSize);
036        this.ds = ds;
037        this.type = type;
038    }
039
040    @Override
041    public PagingResponse<Dataset> nextPage(PagingRequest page) {
042        if (type == null) {
043            return ds.list(page);
044        } else {
045            return ds.listByType(type, page);
046        }
047    }
048
049}