com.jredrain.tag.Page.java Source code

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Here is the source code for com.jredrain.tag.Page.java

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/**
 * Copyright 2016 benjobs
 * <p>
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you 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
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * 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 com.jredrain.tag;

import org.apache.commons.lang3.StringUtils;

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

public class Page<T> implements Serializable {

    private static final long serialVersionUID = 8199494836903931588L;

    // -- ?? --//
    public static final String ASC = "asc";
    public static final String DESC = "desc";

    // -- ? --//
    protected int pageNo = 1;
    protected int pageSize = 15;
    protected String orderBy = null;
    protected String order = null;
    protected boolean autoCount = true;

    // --  --//
    protected List<T> result = Collections.emptyList();
    protected long totalCount = -1;

    // --  --//
    public Page() {
    }

    public Page(final int pageSize) {
        setPageSize(pageSize);
    }

    public Page(final Integer pageNo, final Integer pageSize) {
        if (pageNo != null) {
            setPageNo(pageNo);
        }
        if (pageSize != null) {
            setPageSize(pageSize);
        }
    }

    public Page(final int pageSize, final boolean autoCount) {
        setPageSize(pageSize);
        setAutoCount(autoCount);
    }

    // -- ? --//

    /**
     * ??,??1,1.
     */
    public int getPageNo() {
        return pageNo;
    }

    /**
     * ??,??1,11.
     */
    public void setPageNo(final int pageNo) {
        this.pageNo = pageNo;

        if (pageNo < 1) {
            this.pageNo = 1;
        }
    }

    /**
     * ??,15.
     */
    public int getPageSize() {
        return pageSize;
    }

    /**
     * ??,11.
     */
    public void setPageSize(final int pageSize) {
        this.pageSize = pageSize;

        if (pageSize < 1) {
            this.pageSize = 1;
        }
    }

    /**
     * ?pageNopageSize???,??1.
     */
    public int getFirst() {
        return ((pageNo - 1) * pageSize) + 1;
    }

    /**
     * ?,.?','.
     */
    public String getOrderBy() {
        return orderBy;
    }

    /**
     * ?,?','.
     */
    public void setOrderBy(final String orderBy) {
        this.orderBy = orderBy;
    }

    /**
     * ??,.
     */
    public boolean isOrderBySetted() {
        return (StringUtils.isNotBlank(orderBy) && StringUtils.isNotBlank(order));
    }

    /**
     * ??.
     */
    public String getOrder() {
        return order;
    }

    /**
     * ???.
     *
     * @param order
     *            ?descasc,?','.
     */
    public void setOrder(final String order) {
        // order?
        String[] orders = StringUtils.split(StringUtils.lowerCase(order), ',');
        for (String orderStr : orders) {
            if (!StringUtils.equals(DESC, orderStr) && !StringUtils.equals(ASC, orderStr))
                throw new IllegalArgumentException("??" + orderStr + "??");
        }

        this.order = StringUtils.lowerCase(order);
    }

    /**
     * ??count?, false.
     */
    public boolean isAutoCount() {
        return autoCount;
    }

    /**
     * ??count?.
     */
    public void setAutoCount(final boolean autoCount) {
        this.autoCount = autoCount;
    }

    // --  --//

    /**
     * ?.
     */
    public List<T> getResult() {
        return result;
    }

    /**
     * .
     */
    public void setResult(final List<T> result) {
        this.result = result;
    }

    /**
     * ?, -1.
     */
    public long getTotalCount() {
        return totalCount;
    }

    /**
     * .
     */
    public void setTotalCount(final long totalCount) {
        this.totalCount = totalCount;
    }

    /**
     * ?pageSizetotalCount, -1.
     */
    public long getTotalPages() {
        if (totalCount < 0)
            return -1;

        long count = totalCount / pageSize;
        if (totalCount % pageSize > 0) {
            count++;
        }
        return count;
    }

    /**
     * ?.
     */
    public boolean isHasNext() {
        return (pageNo + 1 <= getTotalPages());
    }

    /**
     * ??, ??1. ????.
     */
    public int getNextPage() {
        if (isHasNext())
            return pageNo + 1;
        else
            return pageNo;
    }

    /**
     * ?.
     */
    public boolean isHasPre() {
        return (pageNo - 1 >= 1);
    }

    /**
     * ??, ??1. ???.
     */
    public int getPrePage() {
        if (isHasPre())
            return pageNo - 1;
        else
            return pageNo;
    }
}