org.jmesa.view.excel.ExcelView Maven / Gradle / Ivy

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/*
 * 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.jmesa.view.excel;

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

import org.apache.commons.lang.StringUtils;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFRichTextString;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.jmesa.view.AbstractExportView;
import org.jmesa.view.component.Column;
import org.jmesa.view.component.Row;
import org.jmesa.view.component.Table;

/**
 * @since 2.1
 * @author jeff jie
 */
public class ExcelView extends AbstractExportView {
    public Object render() {
        HSSFWorkbook workbook = new HSSFWorkbook();
        Table table = this.getTable();
        String caption = table.getCaption();
        if (StringUtils.isEmpty(caption)) {
            caption = "JMesa Export";
        }
        HSSFSheet sheet = workbook.createSheet(caption);

        Row row = table.getRow();
        row.getRowRenderer();
        List columns = table.getRow().getColumns();

        // renderer header
        HSSFRow hssfRow = sheet.createRow(0);
        int columncount = 0;
        for (Column col : columns) {
            HSSFCell cell = hssfRow.createCell((short) columncount++);
            cell.setCellValue(new HSSFRichTextString(col.getTitle()));
        }

        // renderer body
        Collection items = getCoreContext().getPageItems();
        int rowcount = 1;
        for (Object item : items) {
            HSSFRow r = sheet.createRow(rowcount++);
            columncount = 0;
            for (Column col : columns) {
                HSSFCell cell = r.createCell((short) columncount++);
                Object value = col.getCellRenderer().render(item, rowcount);
                if (value == null) {
                    value = "";
                }

                if (value instanceof Number) {
                    Double number = Double.valueOf(value.toString());
                    cell.setCellValue(number);
                } else {
                    cell.setCellValue(new HSSFRichTextString(value.toString()));
                }
            }
        }
        return workbook;
    }
}