Novo export view para displaytags [adicionar textos no relatorio]

import java.awt.Color;
import java.io.OutputStream;
import java.util.Iterator;

import javax.servlet.jsp.JspException;

import org.apache.commons.lang.ObjectUtils;
import org.apache.commons.lang.StringUtils;
import org.displaytag.Messages;
import org.displaytag.exception.BaseNestableJspTagException;
import org.displaytag.exception.SeverityEnum;
import org.displaytag.export.BinaryExportView;
import org.displaytag.export.PdfView;
import org.displaytag.model.Column;
import org.displaytag.model.ColumnIterator;
import org.displaytag.model.HeaderCell;
import org.displaytag.model.Row;
import org.displaytag.model.RowIterator;
import org.displaytag.model.TableModel;
import org.displaytag.render.ItextTableWriter;
import org.displaytag.util.TagConstants;

import com.lowagie.text.BadElementException;
import com.lowagie.text.Cell;
import com.lowagie.text.Chunk;
import com.lowagie.text.Document;
import com.lowagie.text.Element;
import com.lowagie.text.Font;
import com.lowagie.text.FontFactory;
import com.lowagie.text.HeaderFooter;
import com.lowagie.text.PageSize;
import com.lowagie.text.Paragraph;
import com.lowagie.text.Phrase;
import com.lowagie.text.Rectangle;
import com.lowagie.text.Table;
import com.lowagie.text.pdf.PdfWriter;

/**
 * MyPdfView.java Criado em 18/06/2008
 *
 * @author
 * @version 1.0
 *
 * Classe responsavel ...
 */

public class MyPdfView implements BinaryExportView {

	/***************************************************************************
	 * TableModel to render.
	 */
	private TableModel model;

	/***************************************************************************
	 * export full list?
	 */
	private boolean exportFull;

	/***************************************************************************
	 * include header in export?
	 */
	private boolean header;

	/***************************************************************************
	 * decorate export?
	 */
	private boolean decorated;

	/***************************************************************************
	 * This is the table, added as an Element to the PDF document. It contains
	 * all the data, needed to represent the visible table into the PDF
	 */
	private Table tablePDF;

	/***************************************************************************
	 * The default font used in the document.
	 */
	private Font smallFont;

	/***************************************************************************
	 * @see org.displaytag.export.ExportView#setParameters(TableModel, boolean,
	 *      boolean, boolean)
	 */
	public void setParameters(TableModel tableModel, boolean exportFullList,
			boolean includeHeader, boolean decorateValues) {
		this.model = tableModel;
		this.exportFull = exportFullList;
		this.header = includeHeader;
		this.decorated = decorateValues;
	}



	/***************************************************************************
	 * Initialize the main info holder table.
	 *
	 * @throws BadElementException
	 *             for errors during table initialization
	 */
	protected void initTable() throws BadElementException {
		tablePDF = new Table(this.model.getNumberOfColumns());
		tablePDF.setDefaultVerticalAlignment(Element.ALIGN_TOP);
		tablePDF.setCellsFitPage(true);
		tablePDF.setWidth(100);

		tablePDF.setPadding(2);
		tablePDF.setSpacing(0);

		smallFont = FontFactory.getFont(FontFactory.HELVETICA, 7, Font.NORMAL,
				new Color(0, 0, 0));

	}

	/***************************************************************************
	 * @see org.displaytag.export.BaseExportView#getMimeType()
	 * @return "application/pdf"
	 */
	public String getMimeType() {
		return "application/pdf"; //$NON-NLS-1$
	}

	/***************************************************************************
	 * The overall PDF table generator.
	 *
	 * @throws JspException
	 *             for errors during value retrieving from the table model
	 * @throws BadElementException
	 *             IText exception
	 */
	protected void generatePDFTable() throws JspException, BadElementException {
		if (this.header) {
			generateHeaders();
		}
		tablePDF.endHeaders();
		generateRows();
	}
	
	/***************************************************************************
	 * @see org.displaytag.export.BinaryExportView#doExport(OutputStream)
	 */
	public void doExport(OutputStream out) throws JspException {
		try {
			// Initialize the table with the appropriate number of columns
			initTable();

			// Initialize the Document and register it with PdfWriter listener
			// and the OutputStream
			Document document = new Document(PageSize.A4.rotate(), 60, 60, 40,
					40);
			document.addCreationDate();
			HeaderFooter footer = new HeaderFooter(new Phrase(
					TagConstants.EMPTY_STRING, smallFont), true);
			footer.setBorder(Rectangle.NO_BORDER);
			footer.setAlignment(Element.ALIGN_CENTER);

			PdfWriter.getInstance(document, out);

			// Fill the virtual PDF table with the necessary data
			generatePDFTable();
			document.open();
			document.setFooter(footer);
			document.add(this.tablePDF);
			document.close();

		} catch (Exception e) {
			throw new PdfGenerationException(e);
		}
	}

	/***************************************************************************
	 * Generates the header cells, which persist on every page of the PDF
	 * document.
	 *
	 * @throws BadElementException
	 *             IText exception
	 */
	protected void generateHeaders() throws BadElementException {
		Iterator iterator = this.model.getHeaderCellList().iterator();

		while (iterator.hasNext()) {
			HeaderCell headerCell = (HeaderCell) iterator.next();

			String columnHeader = headerCell.getTitle();

			if (columnHeader == null) {
				columnHeader = StringUtils.capitalize(headerCell
						.getBeanPropertyName());
			}

			Cell hdrCell = getCell(columnHeader);
			hdrCell.setGrayFill(0.9f);
			hdrCell.setHeader(true);
			tablePDF.addCell(hdrCell);

		}
	}

	/***************************************************************************
	 * Generates all the row cells.
	 *
	 * @throws JspException
	 *             for errors during value retrieving from the table model
	 * @throws BadElementException
	 *             errors while generating content
	 */
	protected void generateRows() throws JspException, BadElementException {
		// get the correct iterator (full or partial list according to the
		// exportFull field)
		RowIterator rowIterator = this.model.getRowIterator(this.exportFull);
		// iterator on rows
		while (rowIterator.hasNext()) {
			Row row = rowIterator.next();

			// iterator on columns
			ColumnIterator columnIterator = row.getColumnIterator(this.model
					.getHeaderCellList());

			while (columnIterator.hasNext()) {
				Column column = columnIterator.nextColumn();

				// Get the value to be displayed for the column
				Object value = column.getValue(this.decorated);

				Cell cell = getCell(ObjectUtils.toString(value));
				tablePDF.addCell(cell);
			}
		}
	}

	/***************************************************************************
	 * Returns a formatted cell for the given value.
	 *
	 * @param value
	 *            cell value
	 * @return Cell
	 * @throws BadElementException
	 *             errors while generating content
	 */
	private Cell getCell(String value) throws BadElementException {
		Cell cell = new Cell(new Chunk(StringUtils.trimToEmpty(value),
				smallFont));
		cell.setVerticalAlignment(Element.ALIGN_TOP);
		cell.setLeading(8);
		return cell;
	}

	/***************************************************************************
	 * Wraps IText-generated exceptions.
	 *
	 * @author Fabrizio Giustina
	 * @version $Revision: 1.7 $ ($Author: fgiust $)
	 */
	static class PdfGenerationException extends BaseNestableJspTagException {

		/***********************************************************************
		 * D1597A17A6.
		 */
		private static final long serialVersionUID = 899149338534L;

		/***********************************************************************
		 * Instantiate a new PdfGenerationException with a fixed message and the
		 * given cause.
		 *
		 * @param cause
		 *            Previous exception
		 */
		public PdfGenerationException(Throwable cause) {
			super(PdfView.class,
					Messages.getString("PdfView.errorexporting"), cause); //$NON-NLS-1$
		}

		/***********************************************************************
		 * @see org.displaytag.exception.BaseNestableJspTagException#getSeverity()
		 */
		public SeverityEnum getSeverity() {
			return SeverityEnum.ERROR;
		}
	}
}