com.liferay.portal.atom.AtomPager.java Source code

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Here is the source code for com.liferay.portal.atom.AtomPager.java

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/**
 * Copyright (c) 2000-present Liferay, Inc. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation; either version 2.1 of the License, or (at your option)
 * any later version.
 *
 * This library 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 Lesser General Public License for more
 * details.
 */

package com.liferay.portal.atom;

import com.liferay.portal.kernel.atom.AtomRequestContext;
import com.liferay.portal.kernel.dao.search.SearchContainer;

import org.apache.abdera.ext.history.FeedPagingHelper;
import org.apache.abdera.model.Feed;

/**
 * @author Igor Spasic
 */
public class AtomPager {

    public AtomPager(AtomRequestContext atomRequestContext, int totalElements) {
        this(atomRequestContext.getIntParameter("page"),
                atomRequestContext.getIntParameter("max", SearchContainer.DEFAULT_DELTA), totalElements);
    }

    public AtomPager(int page, int totalElements) {
        this(page, SearchContainer.DEFAULT_DELTA, totalElements);
    }

    public AtomPager(int page, int elementsPerPage, int totalElements) {
        _firstPage = 1;

        int lastPage = totalElements / elementsPerPage;

        if ((totalElements % elementsPerPage) > 0) {
            lastPage++;
        }

        if (lastPage == 0) {
            lastPage = 1;
        }

        _lastPage = lastPage;

        if (page < _firstPage) {
            _page = _firstPage;
        } else if (page > _lastPage) {
            _page = _lastPage;
        } else {
            _page = page;
        }

        _elementsPerPage = elementsPerPage;
        _totalElements = totalElements;

        _start = (_page - 1) * _elementsPerPage;

        int end = _start + _elementsPerPage;

        if (end > totalElements) {
            end = totalElements;
        }

        _end = end - 1;

        _previousPage = _page - 1;

        int nextPage = _page + 1;

        if (nextPage > _lastPage) {
            nextPage = 0;
        }

        _nextPage = nextPage;
    }

    public int getElementsPerPage() {
        return _elementsPerPage;
    }

    public int getEnd() {
        return _end;
    }

    public int getFirstPage() {
        return _firstPage;
    }

    public int getLastPage() {
        return _lastPage;
    }

    public int getNextPage() {
        return _nextPage;
    }

    public int getPage() {
        return _page;
    }

    public int getPreviousPage() {
        return _previousPage;
    }

    public int getStart() {
        return _start;
    }

    public int getTotalElements() {
        return _totalElements;
    }

    public void setFeedPagingLinks(Feed feed, String url) {
        FeedPagingHelper.setFirst(feed, AtomUtil.setPageInUrl(url, 1));
        FeedPagingHelper.setLast(feed, AtomUtil.setPageInUrl(url, _lastPage));

        if (_previousPage != 0) {
            FeedPagingHelper.setPrevious(feed, AtomUtil.setPageInUrl(url, _previousPage));
        }

        if (_nextPage != 0) {
            FeedPagingHelper.setNext(feed, AtomUtil.setPageInUrl(url, _nextPage));
        }
    }

    private final int _elementsPerPage;
    private final int _end;
    private final int _firstPage;
    private final int _lastPage;
    private final int _nextPage;
    private final int _page;
    private final int _previousPage;
    private final int _start;
    private final int _totalElements;

}