generatecolumns.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.tag;

import java.util.Collection;
import java.util.Iterator;
import java.util.List;

import org.apache.commons.beanutils.PropertyUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.extremecomponents.table.bean.Column;
import org.extremecomponents.table.core.BaseModel;
import org.extremecomponents.util.ExtremeUtils;

/**
 * Helper methods for the tag classes. Trying to keep the logic out of the tags
 * so can move to the JSP 2.0 container easier.
 * 
 * @author $author$
 */
public final class GenerateColumns {
    private static Log logger = LogFactory.getLog(TableTag.class);

    private GenerateColumns() {
    }

    /**
     * If no columns are defined then set the columns automatically. Note: This
     * is just for testing...the filtering or headers will not work.
     */
    public static void autoSetColumns(TableTag tableTag, Collection rows)
            throws Exception {
        logger.info("no columns defined so set them automatically");

        BaseModel model = tableTag.getModel();

        // set column meta data
        for (Iterator iter = rows.iterator(); iter.hasNext();) {
            Object bean = iter.next();
            List properties = ExtremeUtils.beanProperties(bean);
            autoAddColumns(model, bean, properties);

            break;
        }

        // set column values
        for (Iterator iter = rows.iterator(); iter.hasNext();) {
            Object bean = iter.next();
            List properties = ExtremeUtils.beanProperties(bean);
            model.getRowHandler().increaseRowCount();
            autoAddColumns(model, bean, properties);
        }
    }

    public static void autoAddColumns(BaseModel model, Object bean, List properties)
            throws Exception {

        for (Iterator iter = properties.iterator(); iter.hasNext();) {
            String property = (String) iter.next();

            if (property.equals("class")) {
                continue;
            }

            Object value = PropertyUtils.getProperty(bean, property);
            if (model.getRowHandler().getRow().getRowCount() > 0) {
                model.getViewHandler().addColumnValue(property, value, value);
            } else {
                Column column = new Column();
                column.addAttribute(Column.PROPERTY, property);
                column.addAttribute(Column.CELL, ColumnTagUtils.getCell(model, null));
                model.getColumnHandler().addColumn(column);
            }
        }
    }
}