com.epam.ta.reportportal.ws.converter.PagedResourcesAssembler.java Source code

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Here is the source code for com.epam.ta.reportportal.ws.converter.PagedResourcesAssembler.java

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/*
 * Copyright 2016 EPAM Systems
 * 
 * 
 * This file is part of EPAM Report Portal.
 * https://github.com/reportportal/service-api
 * 
 * Report Portal is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * Report Portal is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with Report Portal.  If not, see <http://www.gnu.org/licenses/>.
 */

package com.epam.ta.reportportal.ws.converter;

import org.springframework.data.domain.Page;
import org.springframework.util.Assert;

import java.util.function.Function;

/**
 * Replacement of Spring's ResourceAssemblerSupport. Adds possibility to
 * converter {@link Page} resources which is basically arrays of entities with
 * pageable information like current page, max pages, total items, etc
 *
 * @param <T> - Type of Entity to be converted
 * @param <R> - Type of Resource to be created from entity
 * @author Andrei Varabyeu
 */
public abstract class PagedResourcesAssembler<T, R> extends ResourceAssembler<T, R> {

    public static <T> Function<Page<T>, com.epam.ta.reportportal.ws.model.Page<T>> pageConverter() {
        return page -> new com.epam.ta.reportportal.ws.model.Page<>(page.getContent(),
                new com.epam.ta.reportportal.ws.model.Page.PageMetadata(page.getSize(), page.getNumber() + 1,
                        page.getTotalElements(), page.getTotalPages()));
    }

    public static <T, R> Function<Page<T>, com.epam.ta.reportportal.ws.model.Page<R>> pageConverter(
            Function<T, R> modelConverter) {
        return page -> PagedResourcesAssembler.<R>pageConverter().apply(page.map(modelConverter::apply));
    }

    /**
     * Creates {@link com.epam.ta.reportportal.ws.model.Page} from {@link Page} DB query result
     *
     * @param content Page to be processed
     * @return Transformed Page
     * @deprecated in favor of using converters based on JDK8 Functions
     */
    @Deprecated
    public com.epam.ta.reportportal.ws.model.Page<R> toPagedResources(Page<T> content) {
        Assert.notNull(content);

        return new com.epam.ta.reportportal.ws.model.Page<>(toResources(content),
                new com.epam.ta.reportportal.ws.model.Page.PageMetadata(content.getSize(), content.getNumber() + 1,
                        content.getTotalElements(), content.getTotalPages()));
    }

}