Package org.pentaho.reporting.ui.datasources.pmd

Source Code of org.pentaho.reporting.ui.datasources.pmd.PmdPreviewWorker

/*
* This program is free software; you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software
* Foundation.
*
* You should have received a copy of the GNU Lesser General Public License along with this
* program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
* or from the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU Lesser General Public License for more details.
*
* Copyright (c) 2009 Pentaho Corporation.  All rights reserved.
*/

package org.pentaho.reporting.ui.datasources.pmd;

import javax.swing.event.TableModelListener;
import javax.swing.table.TableModel;

import org.pentaho.reporting.engine.classic.core.MetaAttributeNames;
import org.pentaho.reporting.engine.classic.core.MetaTableModel;
import org.pentaho.reporting.engine.classic.core.ParameterDataRow;
import org.pentaho.reporting.engine.classic.core.ReportDataFactoryException;
import org.pentaho.reporting.engine.classic.core.states.QueryDataRowWrapper;
import org.pentaho.reporting.engine.classic.core.util.CloseableTableModel;
import org.pentaho.reporting.engine.classic.core.wizard.DataAttributes;
import org.pentaho.reporting.engine.classic.core.wizard.DefaultDataAttributeContext;
import org.pentaho.reporting.engine.classic.extensions.datasources.pmd.PmdDataFactory;
import org.pentaho.reporting.engine.classic.extensions.datasources.pmd.PmdDataFactoryModule;
import org.pentaho.reporting.libraries.designtime.swing.background.CancelEvent;
import org.pentaho.reporting.libraries.designtime.swing.background.PreviewWorker;

/**
* Todo: Document me!
* <p/>
* Date: 11.08.2009
* Time: 21:14:26
*
* @author Thomas Morgner.
*/
public class PmdPreviewWorker implements PreviewWorker
{
  private static class PreviewTableModel implements CloseableTableModel, MetaTableModel
  {
    private MetaTableModel metaTableModel;
    private DefaultDataAttributeContext dataAttributeContext;

    private PreviewTableModel(final MetaTableModel metaTableModel)
    {
      this.metaTableModel = metaTableModel;
      dataAttributeContext = new DefaultDataAttributeContext();
    }

    /**
     * If this model has disposeable resources assigned, close them or dispose them.
     */
    public void close()
    {
      if (metaTableModel instanceof CloseableTableModel)
      {
        final CloseableTableModel ctm = (CloseableTableModel) metaTableModel;
        ctm.close();
      }
    }

    public DataAttributes getCellDataAttributes(final int row, final int column)
    {
      return metaTableModel.getCellDataAttributes(row, column);
    }

    public boolean isCellDataAttributesSupported()
    {
      return metaTableModel.isCellDataAttributesSupported();
    }

    public DataAttributes getColumnAttributes(final int column)
    {
      return metaTableModel.getColumnAttributes(column);
    }

    public DataAttributes getTableAttributes()
    {
      return metaTableModel.getTableAttributes();
    }

    public int getRowCount()
    {
      return metaTableModel.getRowCount();
    }

    public int getColumnCount()
    {
      return metaTableModel.getColumnCount();
    }

    public String getColumnName(final int columnIndex)
    {
      final DataAttributes columnAttributes = getColumnAttributes(columnIndex);
      final String friendlyName = (String) columnAttributes.getMetaAttribute
          (PmdDataFactoryModule.META_DOMAIN, MetaAttributeNames.Core.NAME,
              String.class, dataAttributeContext);
      if (friendlyName != null)
      {
        return friendlyName;
      }
      return metaTableModel.getColumnName(columnIndex);
    }

    public Class getColumnClass(final int columnIndex)
    {
      return metaTableModel.getColumnClass(columnIndex);
    }

    public boolean isCellEditable(final int rowIndex, final int columnIndex)
    {
      return metaTableModel.isCellEditable(rowIndex, columnIndex);
    }

    public Object getValueAt(final int rowIndex, final int columnIndex)
    {
      return metaTableModel.getValueAt(rowIndex, columnIndex);
    }

    public void setValueAt(final Object aValue, final int rowIndex, final int columnIndex)
    {
      metaTableModel.setValueAt(aValue, rowIndex, columnIndex);
    }

    public void addTableModelListener(final TableModelListener l)
    {
      metaTableModel.addTableModelListener(l);
    }

    public void removeTableModelListener(final TableModelListener l)
    {
      metaTableModel.removeTableModelListener(l);
    }
  }

  private PmdDataFactory dataFactory;
  private PreviewTableModel resultTableModel;
  private ReportDataFactoryException exception;
  private String query;
  private int queryTimeout;
  private int queryLimit;

  public PmdPreviewWorker(final PmdDataFactory dataFactory,
                          final String query,
                          final int queryTimeout,
                          final int queryLimit)
  {
    this.queryTimeout = queryTimeout;
    this.queryLimit = queryLimit;
    if (dataFactory == null)
    {
      throw new NullPointerException();
    }
    this.query = query;
    this.dataFactory = dataFactory;
  }

  public ReportDataFactoryException getException()
  {
    return exception;
  }

  public TableModel getResultTableModel()
  {
    return resultTableModel;
  }

  public void close()
  {
    if (resultTableModel != null)
    {
      resultTableModel.close();
      resultTableModel = null;
    }

    if (dataFactory != null)
    {
      dataFactory.close();
      dataFactory = null;
    }

  }

  /**
   * Requests that the thread stop processing as soon as possible.
   */
  public void cancelProcessing(final CancelEvent event)
  {
    dataFactory.cancelRunningQuery();
  }

  /**
   * When an object implementing interface <code>Runnable</code> is used
   * to create a thread, starting the thread causes the object's
   * <code>run</code> method to be called in that separately executing
   * thread.
   * <p/>
   * The general contract of the method <code>run</code> is that it may
   * take any action whatsoever.
   *
   * @see Thread#run()
   */
  public void run()
  {
    try
    {
      dataFactory.open();
      final TableModel tableModel = dataFactory.queryData
          (query, new QueryDataRowWrapper(new ParameterDataRow(), queryLimit, queryTimeout));
      resultTableModel = new PreviewTableModel((MetaTableModel) tableModel);
    }
    catch (ReportDataFactoryException e)
    {
      exception = e;
    }
  }
}
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