PageContainerBean.java

/**
 * Copyright © 2002 Instituto Superior Técnico
 *
 * This file is part of FenixEdu Academic.
 *
 * FenixEdu Academic 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 3 of the License, or
 * (at your option) any later version.
 *
 * FenixEdu Academic 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.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with FenixEdu Academic.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.fenixedu.academic.dto;

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

import pt.ist.fenixframework.DomainObject;

public class PageContainerBean implements Serializable {

    private transient List<DomainObject> objects;
    private List<DomainObject> pageObjects;
    private DomainObject selected;
    private Integer numberOfPages;

    private Integer page = 1;

    public List<DomainObject> getObjects() {
        return objects;
    }

    public void setObjects(List<DomainObject> objects) {
        this.objects = objects;
        setPageObjects(null);
    }

    protected List<DomainObject> getPageObjects() {
        return this.pageObjects;
    }

    protected void setPageObjects(List<DomainObject> pageObjects) {
        this.pageObjects = pageObjects;
    }

    public Integer getPage() {
        return page;
    }

    public void setPage(Integer page) {
        this.page = page;
    }

    public DomainObject getSelected() {
        return this.selected;
    }

    public void setSelected(DomainObject selected) {
        this.selected = selected;
    }

    public List<DomainObject> getPageByPageSize(int pageSize) {
        List<DomainObject> pageObjects = getPageObjects();
        if (pageObjects != null) {
            return pageObjects;
        } else {
            List<DomainObject> objects = getObjects();
            if (objects != null && !objects.isEmpty()) {
                validatePageNumber(pageSize);
                int from = (getPage() - 1) * pageSize;
                int to = getObjects().size() > getPage() * pageSize ? getPage() * pageSize : objects.size();
                List<DomainObject> subList = new ArrayList<DomainObject>(objects.subList(from, to));
                setPageObjects(subList);
                return subList;
            } else {
                return Collections.emptyList();
            }
        }
    }

    private void validatePageNumber(int pageSize) {
        if (getPage() < 1) {
            setPage(1);
        } else {
            Integer numberOfPages = getNumberOfPages(pageSize);
            if (getPage() > numberOfPages) {
                setPage(numberOfPages);
            }
        }

    }

    public int getNumberOfPages(int pageSize) {
        if (getObjects() != null) {
            this.numberOfPages = (int) Math.ceil((double) getObjects().size() / pageSize);
        }
        return this.numberOfPages;
    }

    public boolean hasNextPage(int pageSize) {
        return getPage() < getNumberOfPages(pageSize);
    }

    public boolean hasPreviousPage(int pageSize) {
        return getPage() > 1;
    }

    public List<DomainObject> getAllObjects() {
        if (getPageObjects() != null) {
            return getPageObjects();
        } else {
            if (getObjects() != null) {
                setPageObjects(getObjects());
                return getObjects();
            } else {
                return Collections.emptyList();
            }
        }
    }

    public void setPageJump(Integer pageJump) {
        setPage(pageJump);
    }

    public Integer getPageJump() {
        return null;
    }

}