/* * Copyright 2015-2017 Red Hat, Inc. and/or its affiliates * and other contributors as indicated by the @author tags. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.hawkular.alerts.rest; import java.util.ArrayList; import java.util.Arrays; import java.util.HashSet; import java.util.List; import java.util.Set; import javax.ws.rs.core.MultivaluedMap; import javax.ws.rs.core.UriInfo; import org.hawkular.alerts.api.model.paging.Order; import org.hawkular.alerts.api.model.paging.PageContext; import org.hawkular.alerts.api.model.paging.Pager; /** * @author Lucas Ponce * @author Lukas Krejci */ public class RequestUtil { public static final Set<String> PARAMS_PAGING = new HashSet<>(Arrays.asList(new String[] { "page", "per_page", "sort", "order" })); private RequestUtil() { } public static Pager extractPaging(UriInfo uri) { MultivaluedMap<String, String> params = uri.getQueryParameters(); String pageS = params.getFirst("page"); String perPageS = params.getFirst("per_page"); List<String> sort = params.get("sort"); List<String> order = params.get("order"); int page = pageS == null ? 0 : Integer.parseInt(pageS); int perPage = perPageS == null ? PageContext.UNLIMITED_PAGE_SIZE : Integer.parseInt(perPageS); List<Order> ordering = new ArrayList<>(); if (sort == null || sort.isEmpty()) { ordering.add(Order.unspecified()); } else { for (int i = 0; i < sort.size(); ++i) { String field = sort.get(i); Order.Direction dir = Order.Direction.ASCENDING; if (order != null && i < order.size()) { dir = Order.Direction.fromShortString(order.get(i)); } ordering.add(Order.by(field, dir)); } } return new Pager(page, perPage, ordering); } }