basesorthandler.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.base;

import java.util.Collection;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;

import org.apache.commons.lang.StringUtils;
import org.extremecomponents.table.core.ParameterRegistry;
import org.extremecomponents.table.core.TableModelUtils;

/**
 * org.extremecomponents.core.model.BaseSortHandler.java -
 * 
 * @author phorn
 */
public abstract class BaseSortHandler {
    public final static String SORT_ASC_ = "asc";
    public final static String SORT_DESC_ = "desc";
    public final static String SORT_DEFAULT_ = "default";
    public final static String SORT_ASC_IMAGE = "sortAsc";
    public final static String SORT_DESC_IMAGE = "sortDesc";

    private BaseModel model;

    public BaseSortHandler(BaseModel model) {
        this.model = model;
    }

    public BaseModel getModel() {
        return model;
    }

    /**
     * Find the column that is doing the sorting. Use the property to key off
     * of.
     */
    public String getSortableProperty() {
        Map parameters = model.getRegistry().getParameters(ParameterRegistry.SORT);

        Set set = parameters.keySet();
        for (Iterator iter = set.iterator(); iter.hasNext();) {
            String name = (String) iter.next();
            String sortParamStr = model.getTableHandler().prefixWithCollection() + ParameterRegistry.SORT;
            return name.substring(sortParamStr.length());
        }

        return null;
    }

    /**
     * Find out if the table is trying to sort.
     */
    public boolean canSort(String property) {
        if (!StringUtils.isEmpty(model.getRegistry().getParameter(ParameterRegistry.SORT + property))) {
            return true;
        }

        return false;
    }
    
    public Map getSort() {
        return TableModelUtils.getSortedOrFilteredParameters(model, ParameterRegistry.SORT);
    }

    public abstract Collection sortRows(Collection rows)
            throws Exception;

}