PaginatedResult.java

/*
 * Copyright 2011-2014 the original author or authors.
 *
 * 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 pl.com.bottega.cqrs.query;

import java.io.Serializable;
import java.util.Collections;
import java.util.List;

@SuppressWarnings("serial")
public class PaginatedResult<T> implements Serializable {
    private final List<T> items;
    private final int pageSize;
    private final int pageNumber;
    private final int pagesCount;
    private final int totalItemsCount;

    public PaginatedResult(int pageNumber, int pageSize) {
        this.pageNumber = pageNumber;
        this.pageSize = pageSize;
        items = Collections.emptyList();
        pagesCount = 0;
        totalItemsCount = 0;
    }

    public PaginatedResult(List<T> items, int pageNumber, int pageSize, int totalItemsCount) {
        this.items = items;
        this.pageNumber = pageNumber;
        this.pageSize = pageSize;
        this.pagesCount = countPages(pageSize, totalItemsCount);
        this.totalItemsCount = totalItemsCount;
    }

    private int countPages(int size, int itemsCount) {
        return (int) Math.ceil((double) itemsCount / size);
    }

    public List<T> getItems() {
        return items;
    }

    public int getPageSize() {
        return pageSize;
    }

    public int getPageNumber() {
        return pageNumber;
    }

    public int getPagesCount() {
        return pagesCount;
    }

    public int getTotalItemsCount() {
        return totalItemsCount;
    }
}