Package org.pentaho.reporting.engine.classic.core.modules.gui.base.parameters

Source Code of org.pentaho.reporting.engine.classic.core.modules.gui.base.parameters.ListParameterComponent$ListUpdateHandler

/*
* 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.engine.classic.core.modules.gui.base.parameters;

import java.awt.Component;
import java.awt.Dimension;
import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Date;
import java.util.HashSet;
import java.util.Iterator;
import javax.swing.DefaultListCellRenderer;
import javax.swing.JComponent;
import javax.swing.JList;
import javax.swing.JScrollPane;
import javax.swing.ListSelectionModel;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;

import org.pentaho.reporting.engine.classic.core.ReportDataFactoryException;
import org.pentaho.reporting.engine.classic.core.modules.gui.base.internal.MinimalScrollPane;
import org.pentaho.reporting.engine.classic.core.modules.gui.commonswing.KeyedComboBoxModel;
import org.pentaho.reporting.engine.classic.core.parameters.ListParameter;
import org.pentaho.reporting.engine.classic.core.parameters.ParameterAttributeNames;
import org.pentaho.reporting.engine.classic.core.parameters.ParameterContext;
import org.pentaho.reporting.engine.classic.core.util.IntegerCache;
import org.pentaho.reporting.libraries.xmlns.common.ParserUtil;

/**
* Todo: Document me!
* <p/>
* Date: 14.05.2009
* Time: 20:27:51
*
* @author Thomas Morgner.
*/
public class ListParameterComponent extends MinimalScrollPane implements ParameterComponent
{
  private class ListUpdateHandler implements ChangeListener
  {
    private ListUpdateHandler()
    {
    }

    public void stateChanged(final ChangeEvent e)
    {
      if (adjustingToUserInput)
      {
        return;
      }

      try
      {

        initialize();
      }
      catch (ReportDataFactoryException rdfe)
      {
        throw new IndexOutOfBoundsException("Failed:" + rdfe.getMessage());
      }
    }

  }

  private class SingleValueListParameterHandler implements ListSelectionListener
  {
    private String key;

    public SingleValueListParameterHandler(final String key)
    {
      this.key = key;
    }

    public void valueChanged(final ListSelectionEvent e)
    {
      if (adjustingToExternalInput || adjustingToUserInput)
      {
        return;
      }

      if (e.getValueIsAdjusting())
      {
        return;
      }
      try
      {
        adjustingToUserInput = true;

        final KeyedComboBoxModel theModel = (KeyedComboBoxModel) list.getModel();
        final int index = list.getSelectedIndex();
        if (index == -1)
        {
          updateContext.setParameterValue(key, null);
        }
        else
        {
          updateContext.setParameterValue(key, theModel.getKeyAt(index));
        }
      }
      finally
      {
        adjustingToUserInput = false;
      }
    }
  }

  private class MultiValueListParameterHandler implements ListSelectionListener
  {
    private String key;

    public MultiValueListParameterHandler(final String key)
    {
      this.key = key;
    }

    public void valueChanged(final ListSelectionEvent e)
    {
      if (adjustingToExternalInput || adjustingToUserInput)
      {
        return;
      }
      if (e.getValueIsAdjusting())
      {
        return;
      }

      try
      {
        adjustingToUserInput = true;

        final KeyedComboBoxModel listModel = (KeyedComboBoxModel) list.getModel();
        final ListSelectionModel selectionModel = list.getSelectionModel();
        selectionModel.setValueIsAdjusting(true);

        // Determine if this selection has added or removed items
        final HashSet<Integer> newSelections = new HashSet<Integer>();
        final int size = listModel.getSize();
        for (int i = 0; i < size; i++)
        {
          if (selectionModel.isSelectedIndex(i))
          {
            newSelections.add(IntegerCache.getInteger(i));
          }
        }

        // Turn on everything that was selected previously
        Iterator it = selectionCache.iterator();
        while (it.hasNext())
        {
          final Integer integer = (Integer) it.next();
          final int index = integer.intValue();
          selectionModel.addSelectionInterval(index, index);
        }

        // Add or remove the delta

        if (newSelections.containsAll(selectionCache) == false)
        {
          it = newSelections.iterator();
          while (it.hasNext())
          {
            final Integer nextInt = (Integer) it.next();
            final int index = nextInt.intValue();
            if (selectionCache.contains(nextInt))
            {
              selectionModel.removeSelectionInterval(index, index);
            }
            else
            {
              selectionModel.addSelectionInterval(index, index);
            }
          }

          // Save selections for next time
          selectionCache.clear();
          for (int i = 0; i < size; i++)
          {
            if (selectionModel.isSelectedIndex(i))
            {
              selectionCache.add(IntegerCache.getInteger(i));
            }
          }
        }

        selectionModel.setValueIsAdjusting(false);

        final int[] indices = list.getSelectedIndices();
        final Object[] keys = new Object[indices.length];
        for (int i = 0; i < keys.length; i++)
        {
          final int index = indices[i];
          keys[i] = listModel.getKeyAt(index);
        }
        updateContext.setParameterValue(key, keys);
      }
      finally
      {
        adjustingToUserInput = false;
      }
    }
  }

  private static class FixedTheJDKListCellRenderer extends DefaultListCellRenderer
  {
    private FixedTheJDKListCellRenderer()
    {
    }

    public Component getListCellRendererComponent(final JList list,
                                                  final Object value,
                                                  final int index,
                                                  final boolean isSelected,
                                                  final boolean cellHasFocus)
    {
      if (value == null)
      {
        return super.getListCellRendererComponent(list, "<null>", index, isSelected, cellHasFocus);//$NON-NLS-1$
      }
      if ("".equals(value))
      {
        return super.getListCellRendererComponent(list, " ", index, isSelected, cellHasFocus);
      }
      return super.getListCellRendererComponent(list, value, index, isSelected, cellHasFocus);
    }
  }

  private ListParameter listParameter;
  private ParameterContext parameterContext;
  private ParameterUpdateContext updateContext;
  private JList list;
  private boolean adjustingToUserInput;
  private boolean adjustingToExternalInput;
  private ArrayList<Integer> selectionCache;
  private ListUpdateHandler changeListener;


  /**
   * Constructs a <code>JList</code> with an empty model.
   */
  public ListParameterComponent(final ListParameter listParameter,
                                final ParameterUpdateContext updateContext,
                                final ParameterContext parameterContext)
  {
    this.listParameter = listParameter;
    this.updateContext = updateContext;
    this.parameterContext = parameterContext;
    this.selectionCache = new ArrayList<Integer>();

    list = new JList();
    list.setCellRenderer(new FixedTheJDKListCellRenderer());

    if (listParameter.isAllowMultiSelection())
    {
      list.addListSelectionListener(new MultiValueListParameterHandler(listParameter.getName()));
      list.setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);
    }
    else
    {
      list.addListSelectionListener(new SingleValueListParameterHandler(listParameter.getName()));
      list.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
    }

    final String layout = listParameter.getParameterAttribute
        (ParameterAttributeNames.Core.NAMESPACE, ParameterAttributeNames.Core.LAYOUT, parameterContext);
    if ("horizontal".equals(layout))//$NON-NLS-1$
    {
      list.setLayoutOrientation(JList.HORIZONTAL_WRAP);
      list.setVisibleRowCount(1);
      list.setPreferredSize(new Dimension((int) list.getMinimumSize().getWidth(), 25));
    }
    else
    {
      final String visibleItemsText = listParameter.getParameterAttribute
          (ParameterAttributeNames.Core.NAMESPACE, ParameterAttributeNames.Core.VISIBLE_ITEMS, parameterContext);
      final int visibleItems = ParserUtil.parseInt(visibleItemsText, 0);
      if (visibleItems > 0)
      {
        list.setVisibleRowCount(visibleItems);
      }
    }

    setViewportView(list);
    getViewport().setMinimumSize(list.getPreferredScrollableViewportSize());
    setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
    setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED);

    changeListener = new ListUpdateHandler();
    updateContext.addChangeListener(changeListener);
  }


  public JComponent getUIComponent()
  {
    return this;
  }

  public void initialize() throws ReportDataFactoryException
  {
    adjustingToExternalInput = true;
    try
    {
      final KeyedComboBoxModel keyedComboBoxModel =
          DefaultParameterComponentFactory.createModel(listParameter, parameterContext);
      list.setModel(keyedComboBoxModel);

      final ListSelectionModel selectionModel = list.getSelectionModel();
      final Object value = updateContext.getParameterValue(listParameter.getName());
      final HashSet keylist = getNormalizedSet(value);
      selectionModel.setValueIsAdjusting(true);
      list.clearSelection();

      final int size = keyedComboBoxModel.getSize();
      for (int i = 0; i < size; i++)
      {
        final Object key = keyedComboBoxModel.getKeyAt(i);
        if (isSafeMatch(key, keylist))
        {
          selectionModel.addSelectionInterval(i, i);
        }
      }
      selectionModel.setValueIsAdjusting(false);
    }
    finally
    {
      adjustingToExternalInput = false;
    }
  }

  private boolean isSafeMatch(final Object key, final Collection values)
  {
    for (final Object value : values)
    {
      if (key == value)
      {
        return true;
      }
      if (key != null && key.equals(value))
      {
        return true;
      }
      if (key instanceof Number && value instanceof Number)
      {
        final BigDecimal bdK = new BigDecimal(key.toString());
        final BigDecimal bdV = new BigDecimal(value.toString());
        return bdK.compareTo(bdV) == 0;
      }
      if (key instanceof Date && value instanceof Date)
      {
        final Date d1 = (Date) key;
        final Date d2 = (Date) value;
        if (d1.getTime() == d2.getTime())
        {
          return true;
        }
      }
    }
    return false;
  }

  protected JList getList()
  {
    return list;
  }

  /**
   * Creates a selection set out of the value given. If the value is null, a set with a null-member is returned.
   *
   * @param o the value for which a selection set should be returned.
   * @return the selection set.
   * @noinspection unchecked
   */
  private HashSet getNormalizedSet(final Object o)
  {
    final HashSet set = new HashSet();
    if (o instanceof Object[])
    {
      final Object[] oa = (Object[]) o;
      set.addAll(Arrays.asList(oa));
    }
    else if (o instanceof Collection)
    {
      set.addAll((Collection) o);
    }
    else
    {
      set.add(o);
    }
    return set;
  }
}
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