modellimitfactory.java

exTreme taglib的使用

/*
 * 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.limit;

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

import org.apache.commons.lang.StringUtils;
import org.extremecomponents.table.core.BaseModel;
import org.extremecomponents.table.core.TableConstants;

/**
 * @author Jeff Johnston
 */
public final class ModelLimitFactory {
    public static Limit createInstanceOfLimit(BaseModel model) {
        return new ModelLimit(model);
    }

    public static void setLimitFilterAndSortAttr(Limit limit) {
        limit.setFilterSet(getFilterSet((ModelLimit)limit));
        limit.setSort(getSort((ModelLimit)limit));
    }

    public static void setLimitPageAndRowAttr(Limit limit, int totalRows) {
        if (limit.getTotalRows() != 0) {
            totalRows = limit.getTotalRows();
        }

        int currentRowsDisplayed = resolveCurrentRowsDisplayed((ModelLimit)limit, totalRows);

        int page = getPage((ModelLimit)limit);

        int rowStart = (page - 1) * currentRowsDisplayed;

        int rowEnd = rowStart + currentRowsDisplayed;

        if (rowEnd > totalRows) {
            rowEnd = totalRows;
        }

        limit.setPage(page);
        limit.setCurrentRowsDisplayed(currentRowsDisplayed);
        limit.setTotalRows(totalRows);
        limit.setRowStart(rowStart);
        limit.setRowEnd(rowEnd);
    }

    private static int resolveCurrentRowsDisplayed(ModelLimit limit, int totalRows) {
        boolean invokeExport = limit.getModel().getExportHandler().invokeExport();
        boolean showPagination = limit.getModel().getTableHandler().getTable().showPagination();
        if (invokeExport || !showPagination) {
            return totalRows;
        }

        String currentRowsDisplayed = limit.getModel().getRegistry().getParameter(TableConstants.CURRENT_ROWS_DISPLAYED);
        if (StringUtils.isNotBlank(currentRowsDisplayed)) {
            return Integer.parseInt(currentRowsDisplayed);
        }

        return limit.getModel().getTableHandler().getTable().getRowsDisplayed();
    }

    private static int getPage(ModelLimit limit) {
        String pagination = limit.getModel().getRegistry().getParameter(TableConstants.PAGE);
        if (!StringUtils.isEmpty(pagination)) {
            return Integer.parseInt(pagination);
        }

        return 1;
    }

    private static Sort getSort(ModelLimit limit) {
        Map sortedParameters = getSortedOrFilteredParameters(limit, TableConstants.SORT);
        return LimitFactoryUtils.getSort(sortedParameters);
    }

    private static FilterSet getFilterSet(ModelLimit limit) {
        Map filteredParameters = getSortedOrFilteredParameters(limit, TableConstants.FILTER);
        FilterSet filterSet = LimitFactoryUtils.getFilterSet(filteredParameters);
        if (filterSet.isCleared()) {
            limit.getModel().getRegistry().clearParameters(TableConstants.FILTER);
        }
        
        return filterSet;
    }

    private static Map getSortedOrFilteredParameters(ModelLimit limit, String parameter) {
        Map subset = new HashMap();

        String prefixWithTableId = limit.getModel().getTableHandler().prefixWithTableId();
        String find = limit.getModel().getTableHandler().prefixWithTableId() + parameter;

        Set set = limit.getModel().getRegistry().getParameters().keySet();
        for (Iterator iter = set.iterator(); iter.hasNext();) {
            String key = (String) iter.next();
            if (key.startsWith(find)) {
                String parameterToFind = StringUtils.substringAfter(key, prefixWithTableId);
                String value = limit.getModel().getRegistry().getParameter(parameterToFind);
                if (StringUtils.isNotBlank(value)) {
                    subset.put(StringUtils.substringAfter(key, find), value);
                }
            }
        }

        return subset;
    }
}