sorthandler.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.tree.handler;

import java.util.Collection;

import org.apache.commons.lang.StringUtils;
import org.extremecomponents.base.BaseModel;
import org.extremecomponents.base.BaseSortHandler;
import org.extremecomponents.table.callback.SortRowsCallback;

/**
 * Deal with the sorting.
 * 
 * @author Jeff Johnston
 */
public class SortHandler extends BaseSortHandler {
    private String property;

    public SortHandler(BaseModel model) {
        super(model);
    }

    /**
     * Take the sortable property and then sort the Collection. Always sort by
     * parentAttribute first.
     */
    public Collection sortRows(Collection rows)
            throws Exception {
        property = getSortableProperty();

        if (!StringUtils.isEmpty(property)) {
            SortRowsCallback sortRowsCallback = (SortRowsCallback) getModel().getCallback(
                    getModel().getTableHandler().getTable().getSortRowsCallback());

            return sortRowsCallback.sortRows(getModel(), rows);
        }

        return rows;
    }
}