tablemodel.java

分页查询控件 分页查询控件

/*
 * Copyright 2004 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 org.extremecomponents.table.core;

import java.util.ArrayList;
import java.util.Collection;

import javax.servlet.jsp.PageContext;

import org.extremecomponents.base.BaseModel;
import org.extremecomponents.base.BaseProperties;
import org.extremecomponents.base.BaseResourceBundle;
import org.extremecomponents.base.BaseSortHandler;
import org.extremecomponents.base.BaseViewHandler;
import org.extremecomponents.table.callback.RetrieveRowsCallback;
import org.extremecomponents.table.handler.SortHandler;
import org.extremecomponents.table.handler.TotalHandler;
import org.extremecomponents.table.handler.ViewHandler;

/**
 * Build up a Model that represents the table. This is the main reference point
 * to all objects that are needed to build the table display up.
 * 
 * @author Jeff Johnston
 */
public class TableModel extends BaseModel {
    private TableProperties properties = new TableProperties(this);
    private TableResourceBundle resourceBundle = new TableResourceBundle(this);
    private SortHandler sortHandler = new SortHandler(this);
    private ViewHandler viewHandler = new ViewHandler(this);
    private TotalHandler totalHander = new TotalHandler(this);

    public TableModel(PageContext pageContext) {
        super(pageContext);
    }

    public BaseSortHandler getSortHandler() {
        return sortHandler;
    }

    public TotalHandler getTotalHandler() {
        return totalHander;
    }

    public BaseViewHandler getViewHandler() {
        return viewHandler;
    }

    public BaseProperties getProperties() {
        return properties;
    }
    
    public BaseResourceBundle getResourceBundle() {
        return resourceBundle;
    }

    /**
     * Do all the filtering and sorting and return the rows of the table that
     * need to be displayed.
     */
    public Collection execute()
            throws Exception {
        RetrieveRowsCallback retrieveRowsCallback = (RetrieveRowsCallback) getCallback(getTableHandler().getTable()
                .getRetrieveRowsCallback());

        getTableHandler().setCollectionOfBeans(retrieveRowsCallback.retrieveRows(this));

        //make a copy for thread safety
        Collection rows = new ArrayList(getTableHandler().getCollectionOfBeans());

        rows = getFilterHandler().filterRows(this, rows);

        getTotalHandler().buildTotals(rows);

        rows = getSortHandler().sortRows(rows);

        getTableHandler().setTableSections(rows.size());

        viewHandler.setView();

        return getTableHandler().splitIntoTableSectionRows(rows);
    }

    public void destroy() {
        properties = null;
        resourceBundle = null;
        sortHandler = null;
        viewHandler = null;
        totalHander = null;
        super.destroy();
    }

}