/*
 * iReport - Visual Designer for JasperReports.
 * Copyright (C) 2002 - 2009 Jaspersoft Corporation. All rights reserved.
 * http://www.jaspersoft.com
 *
 * Unless you have purchased a commercial license agreement from Jaspersoft,
 * the following license terms apply:
 *
 * This program is part of iReport.
 *
 * iReport is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * iReport 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with iReport. If not, see <http://www.gnu.org/licenses/>.
 */
package com.jaspersoft.ireport.designer.outline.nodes;

import com.jaspersoft.ireport.designer.ElementDecorator;
import com.jaspersoft.ireport.designer.IReportManager;
import com.jaspersoft.ireport.designer.editor.ExpressionContext;
import com.jaspersoft.ireport.designer.outline.nodes.properties.ElementPropertiesFactory;
import com.jaspersoft.ireport.designer.ModelUtils;
import com.jaspersoft.ireport.designer.NotRealElementNode;
import com.jaspersoft.ireport.designer.actions.BringElementForwardAction;
import com.jaspersoft.ireport.designer.actions.BringElementToFrontAction;
import com.jaspersoft.ireport.designer.actions.CopyFormatAction;
import com.jaspersoft.ireport.designer.actions.EditTextfieldExpressionAction;
import com.jaspersoft.ireport.designer.actions.EditTextfieldPatternAction;
import com.jaspersoft.ireport.designer.actions.GroupElementsAction;
import com.jaspersoft.ireport.designer.actions.OpenSubreportAction;
import com.jaspersoft.ireport.designer.actions.PaddingAndBordersAction;
import com.jaspersoft.ireport.designer.actions.PasteFormatAction;
import com.jaspersoft.ireport.designer.actions.SendElementBackwardAction;
import com.jaspersoft.ireport.designer.actions.SendElementToBackAction;
import com.jaspersoft.ireport.designer.actions.TransformElementAction;
import com.jaspersoft.ireport.designer.actions.UnGroupElementsAction;
import com.jaspersoft.ireport.designer.charts.ChartDataAction;
import com.jaspersoft.ireport.designer.charts.multiaxis.AddAxisChartAction;
import com.jaspersoft.ireport.designer.dnd.DnDUtilities;
import com.jaspersoft.ireport.designer.formatting.actions.OrganizeAsTableAction;
import com.jaspersoft.ireport.designer.menu.HyperlinkAction;
import com.jaspersoft.ireport.designer.sheet.properties.ExpressionProperty;
import com.jaspersoft.ireport.designer.undo.DeleteElementUndoableEdit;
import com.jaspersoft.ireport.designer.utils.SubMenuAction;
import com.jaspersoft.ireport.designer.utils.WeakPreferenceChangeListener;
import java.awt.datatransfer.Transferable;
import java.awt.dnd.DnDConstants;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.prefs.PreferenceChangeEvent;
import java.util.prefs.PreferenceChangeListener;
import javax.swing.Action;
import net.sf.jasperreports.charts.design.JRDesignDataRange;
import net.sf.jasperreports.charts.design.JRDesignMeterPlot;
import net.sf.jasperreports.charts.design.JRDesignThermometerPlot;
import net.sf.jasperreports.charts.design.JRDesignValueDisplay;
import net.sf.jasperreports.engine.JRBoxContainer;
import net.sf.jasperreports.engine.JRDatasetParameter;
import net.sf.jasperreports.engine.JRHyperlink;
import net.sf.jasperreports.engine.base.JRBaseLineBox;
import net.sf.jasperreports.engine.base.JRBasePen;
import net.sf.jasperreports.engine.design.JRDesignChart;
import net.sf.jasperreports.engine.design.JRDesignChartDataset;
import net.sf.jasperreports.engine.design.JRDesignDataset;
import net.sf.jasperreports.engine.design.JRDesignElement;
import net.sf.jasperreports.engine.design.JRDesignElementGroup;
import net.sf.jasperreports.engine.design.JRDesignEllipse;
import net.sf.jasperreports.engine.design.JRDesignExpression;
import net.sf.jasperreports.engine.design.JRDesignFrame;
import net.sf.jasperreports.engine.design.JRDesignGraphicElement;
import net.sf.jasperreports.engine.design.JRDesignImage;
import net.sf.jasperreports.engine.design.JRDesignRectangle;
import net.sf.jasperreports.engine.design.JRDesignStaticText;
import net.sf.jasperreports.engine.design.JRDesignSubreport;
import net.sf.jasperreports.engine.design.JRDesignTextField;
import net.sf.jasperreports.engine.design.JasperDesign;
import org.openide.actions.CopyAction;
import org.openide.actions.CutAction;
import org.openide.actions.DeleteAction;
import org.openide.actions.PasteAction;
import org.openide.nodes.Children;
import org.openide.nodes.Index;
import org.openide.nodes.Node;
import org.openide.nodes.NodeTransfer;
import org.openide.nodes.Sheet;
import org.openide.util.Lookup;
import org.openide.util.actions.SystemAction;
import org.openide.util.datatransfer.PasteType;
import org.openide.util.lookup.Lookups;
import org.openide.util.lookup.ProxyLookup;

/**
 *
 * @author gtoffoli
 */
public class ElementNode extends IRIndexedNode implements PropertyChangeListener, ExpressionHolder, PreferenceChangeListener {

    JasperDesign jd = null;
    JRDesignElement element = null;
    private ElementNameVisitor elemenNameVisitor = null;

    public JRDesignElement getElement() {
        return element;
    }
        
    public JasperDesign getJasperDesign() {
        return jd;
    }

    public void setElement(JRDesignElement element) {
        this.element = element;
    }

    public void preferenceChange(PreferenceChangeEvent evt) {
          fireDisplayNameChange(null, getDisplayName());
    }

    public ElementNode(JasperDesign jd, JRDesignElement element, Children children, Index index, Lookup doLkp)
    {
        super (children, index, new ProxyLookup( doLkp, Lookups.fixed(jd,element)));
        elemenNameVisitor = new ElementNameVisitor(jd);
        this.jd = jd;
        this.element = element;
        
        element.getEventSupport().addPropertyChangeListener(this);

        IReportManager.getPreferences().addPreferenceChangeListener(new WeakPreferenceChangeListener(this,IReportManager.getInstance().getPreferences()));
        
        if (element instanceof JRDesignGraphicElement)
        {
            JRDesignGraphicElement gele = (JRDesignGraphicElement)element;
            ((JRBasePen)gele.getLinePen()).getEventSupport().addPropertyChangeListener(this);
        }

        if (element instanceof JRBoxContainer)
        {
            JRBoxContainer boxcontainer = (JRBoxContainer)element;
            JRBaseLineBox baseBox = (JRBaseLineBox)boxcontainer.getLineBox();
            baseBox.getEventSupport().addPropertyChangeListener(this);
            ((JRBasePen)baseBox.getPen()).getEventSupport().addPropertyChangeListener(this);
            ((JRBasePen)baseBox.getTopPen()).getEventSupport().addPropertyChangeListener(this);
            ((JRBasePen)baseBox.getBottomPen()).getEventSupport().addPropertyChangeListener(this);
            ((JRBasePen)baseBox.getLeftPen()).getEventSupport().addPropertyChangeListener(this);
            ((JRBasePen)baseBox.getRightPen()).getEventSupport().addPropertyChangeListener(this);
        }
        
    }
    
    public ElementNode(JasperDesign jd, JRDesignElement element, Lookup doLkp)
    {
        this(jd,element, Children.LEAF, null,doLkp);
    }
    
    public ElementNode(JasperDesign jd, JRDesignElement element, ElementContainerChildren children, Lookup doLkp)
    {
        this(jd,element, children, children.getIndex(),doLkp);
    }

    @Override
    protected Sheet createSheet() {
        Sheet sheet = super.createSheet();
        
        // adding common properties...
        List<Sheet.Set> propertiesSets = ElementPropertiesFactory.getPropertySets(element, jd);
                
        for (int i=0; i<propertiesSets.size(); ++i)
        {
                sheet.put( propertiesSets.get(i));
        }
        
        return sheet;
    }
    
//    @Override
//    public void setDisplayName(String name) {
//        super.setDisplayName(name 
//            + ((element.getKey() != null &&  element.getKey().length() > 0) ? " (" +  element.getKey() + ")" : ""));
//    }
    
    public String getDisplayName()
    {
        if (elemenNameVisitor != null && getElement() != null)
        {
            return elemenNameVisitor.getName(getElement());
        }
        else
        {
            return super.getDisplayName();
        }
    }
    
    /**
     * Elements can be cut, so canCut returns always true.
     */
    @Override
    public boolean canCut() {
        return true;
    }
    
    /**
     *  This is used internally to understand if the element can accept other elements...
     */
    public boolean canPaste() {
        return true;
    }
    
    /**
     * Elements can not be renamed, so canRename returns always false.
     */
    @Override
    public boolean canRename() {
        return false;
    }
    
    /**
     * Elements can not be destroied , so canDestroy returns always true.
     */
    @Override
    public boolean canDestroy() {
        return true;
    }
    
    /**
     * When this node is destroied, we have to remove this element from his parent container.
     */
    @Override
    public void destroy() throws IOException {
       
       Object container = element.getElementGroup();
       int index = 0;
       
       if (container instanceof JRDesignElementGroup)
       {
           index = ((JRDesignElementGroup)container).getChildren().indexOf(element);
           ((JRDesignElementGroup)container).removeElement(element);
       
       }
       if (container instanceof JRDesignFrame)
       {
           index = ((JRDesignFrame)container).getChildren().indexOf(element);
           ((JRDesignFrame)container).removeElement(element);
       }
       DeleteElementUndoableEdit edit = new DeleteElementUndoableEdit(element,container,index);
       IReportManager.getInstance().addUndoableEdit(edit, true);
       // TODO: add Unduable edit here
       super.destroy();
    }
    
    
    @Override
    public Transferable clipboardCut() throws IOException {
        return NodeTransfer.transferable(this, NodeTransfer.CLIPBOARD_CUT);
    }
    
    @Override
    public Transferable clipboardCopy() throws IOException {
        return NodeTransfer.transferable(this, NodeTransfer.CLIPBOARD_COPY);
    }
    
    @Override
    public Transferable drag() throws IOException {
        return clipboardCut();
    }
    
    @Override
    public Action[] getActions(boolean popup) {
        java.util.List<Action> list = new ArrayList<Action>();

        if (getElement() instanceof JRDesignSubreport)
        {

            list.add( SystemAction.get( OpenSubreportAction.class ) );
            list.add( null );
        }

        if (element instanceof JRDesignTextField)
        {
            list.add( SystemAction.get(EditTextfieldExpressionAction.class ) );
            list.add( SystemAction.get(EditTextfieldPatternAction.class ) );
        }

        if (getElement() instanceof JRDesignChart &&
            ((JRDesignChart)getElement()).getChartType() != JRDesignChart.CHART_TYPE_MULTI_AXIS)
        {
            list.add( ChartDataAction.getInstance() );
            list.add( null );
        }

        if (getElement() instanceof JRDesignChart &&
            ((JRDesignChart)getElement()).getChartType() == JRDesignChart.CHART_TYPE_MULTI_AXIS)
        {
            list.add( AddAxisChartAction.getInstance() );
            list.add( null );
        }
        
        if (getElement() instanceof JRBoxContainer)
        {
            
            list.add( SystemAction.get( PaddingAndBordersAction.class ));
            
        }
        
        if (getElement() instanceof JRHyperlink)
        {
            list.add( HyperlinkAction.getInstance() );
            list.add( null );
        }
        
        list.add( SystemAction.get( CopyAction.class ) );
        list.add( SystemAction.get( CutAction.class ) );
        if (canPaste()) list.add( SystemAction.get( PasteAction.class ) );
        list.add( SystemAction.get( DeleteAction.class ) );
        list.add( null  );
        list.add( SystemAction.get( CopyFormatAction.class ) );
        list.add( SystemAction.get( PasteFormatAction.class ) );

        if (getElement() instanceof JRDesignRectangle ||
            getElement() instanceof JRDesignEllipse ||
            getElement() instanceof JRDesignTextField ||
            getElement() instanceof JRDesignStaticText ||
            getElement() instanceof JRDesignChart)
        {
            list.add( SystemAction.get(TransformElementAction.class) );
        }
        list.add( null );

        list.add( SystemAction.get( GroupElementsAction.class ) );
        list.add( SystemAction.get( UnGroupElementsAction.class ) );
        
        //list.add( SystemAction.get( ReorderAction.class ) );
        boolean showFormattingTools = true;

        if (this.getParentNode() != null &&
            this.getParentNode() instanceof ElementNode)
        {
                JRDesignElement multiaxischart = ((ElementNode)this.getParentNode()).getElement();
                if (multiaxischart instanceof JRDesignChart &&
                    ((JRDesignChart)multiaxischart).getChartType() == JRDesignChart.CHART_TYPE_MULTI_AXIS)
                {
                    showFormattingTools = false;
                }
        }

        if (showFormattingTools)
        {
            list.add( SystemAction.get(BringElementToFrontAction.class) );
            list.add( SystemAction.get(BringElementForwardAction.class) );
            list.add( SystemAction.get(SendElementBackwardAction.class) );
            list.add( SystemAction.get(SendElementToBackAction.class) );
            list.add( null  );
            list.add(  SubMenuAction.getAction("Menu/Format/Align"));
            list.add(  SubMenuAction.getAction("Menu/Format/Size"));
            list.add(  SubMenuAction.getAction("Menu/Format/Position"));
            list.add( null  );
            list.add(  SubMenuAction.getAction("Menu/Format/Horizontal Spacing"));
            list.add(  SubMenuAction.getAction("Menu/Format/Vertical Spacing"));
            list.add( null  );
            list.add( SystemAction.get(OrganizeAsTableAction.class) );
        }
        

        // Looks for decorators supporting this element type...
        List<ElementDecorator> decorators = IReportManager.getElementDecorators( getElement() );

        if (decorators.size() > 0)
        {
            list.add( null  );
        }
        for (ElementDecorator decorator : decorators)
        {
            list.addAll(Arrays.asList(decorator.getActions(this)));
        }
        //Pdf508TagDecorator pdf508TagDecorator = new Pdf508TagDecorator();
        

        return list.toArray(new Action[list.size()]);
    }
    
    public void propertyChange(PropertyChangeEvent evt) {
        
        com.jaspersoft.ireport.designer.IReportManager.getInstance().notifyReportChange();
        if (evt.getPropertyName() == null) return;
        if (evt.getPropertyName().equals( JRDesignElement.PROPERTY_KEY) ||
            evt.getPropertyName().equals(JRDesignImage.PROPERTY_EXPRESSION) ||
            evt.getPropertyName().equals(JRDesignTextField.PROPERTY_EXPRESSION))
        {
            fireNameChange(null, getName());
            fireDisplayNameChange(null, getDisplayName());
        }
        
        if (evt.getPropertyName().equals(JRDesignElement.PROPERTY_PARENT_STYLE))
        {
            this.firePropertyChange(JRDesignElement.PROPERTY_PARENT_STYLE_NAME_REFERENCE, evt.getOldValue(), evt.getNewValue() );
        }
        if (evt.getPropertyName().equals(JRDesignImage.PROPERTY_EXPRESSION))
        {
            this.firePropertyChange(JRDesignExpression.PROPERTY_VALUE_CLASS_NAME, evt.getOldValue(), evt.getNewValue() );
        }
//FIXME
//        if (evt.getPropertyName().equals(JRBaseStyle.PROPERTY_BORDER))
//        {
//                this.firePropertyChange(JRBaseStyle.PROPERTY_TOP_BORDER, evt.getOldValue(), evt.getNewValue() );
//                this.firePropertyChange(JRBaseStyle.PROPERTY_LEFT_BORDER, evt.getOldValue(), evt.getNewValue() );
//                this.firePropertyChange(JRBaseStyle.PROPERTY_RIGHT_BORDER, evt.getOldValue(), evt.getNewValue() );
//        }
//        
//        if (evt.getPropertyName().equals(JRBaseStyle.PROPERTY_BORDER_COLOR))
//        {
//                this.firePropertyChange(JRBaseStyle.PROPERTY_TOP_BORDER_COLOR, evt.getOldValue(), evt.getNewValue() );
//                this.firePropertyChange(JRBaseStyle.PROPERTY_LEFT_BORDER_COLOR, evt.getOldValue(), evt.getNewValue() );
//                this.firePropertyChange(JRBaseStyle.PROPERTY_RIGHT_BORDER_COLOR, evt.getOldValue(), evt.getNewValue() );
//        }
//        
//        if (evt.getPropertyName().equals(JRBaseStyle.PROPERTY_PADDING))
//        {
//                this.firePropertyChange(JRBaseStyle.PROPERTY_TOP_PADDING, evt.getOldValue(), evt.getNewValue() );
//                this.firePropertyChange(JRBaseStyle.PROPERTY_LEFT_PADDING, evt.getOldValue(), evt.getNewValue() );
//                this.firePropertyChange(JRBaseStyle.PROPERTY_RIGHT_PADDING, evt.getOldValue(), evt.getNewValue() );
//        }
        
        if (evt.getPropertyName().equals(JRDesignSubreport.PROPERTY_CONNECTION_EXPRESSION))
        {
                this.firePropertyChange(JRDesignSubreport.PROPERTY_DATASOURCE_EXPRESSION, evt.getOldValue(), evt.getNewValue() );
                this.firePropertyChange("PROPERTY_CONNECTION_TYPE", evt.getOldValue(), evt.getNewValue() );
        }
        if (evt.getPropertyName().equals(JRDesignSubreport.PROPERTY_DATASOURCE_EXPRESSION))
        {
                this.firePropertyChange(JRDesignSubreport.PROPERTY_CONNECTION_EXPRESSION, evt.getOldValue(), evt.getNewValue() );
                this.firePropertyChange("PROPERTY_CONNECTION_TYPE", evt.getOldValue(), evt.getNewValue() );
        }
        
        if (evt.getPropertyName().equals(JRDesignMeterPlot.PROPERTY_DATA_RANGE) ||
            evt.getPropertyName().equals(JRDesignThermometerPlot.PROPERTY_DATA_RANGE))
        {
                this.firePropertyChange( JRDesignDataRange.PROPERTY_HIGH_EXPRESSION, evt.getOldValue(), evt.getNewValue() );
                this.firePropertyChange( JRDesignDataRange.PROPERTY_LOW_EXPRESSION, evt.getOldValue(), evt.getNewValue() );
        }
        else if (evt.getPropertyName().equals(JRDesignThermometerPlot.PROPERTY_LOW_RANGE))
        {
                this.firePropertyChange( "LOW_RANGE_" + JRDesignDataRange.PROPERTY_HIGH_EXPRESSION, evt.getOldValue(), evt.getNewValue() );
                this.firePropertyChange( "LOW_RANGE_" + JRDesignDataRange.PROPERTY_LOW_EXPRESSION, evt.getOldValue(), evt.getNewValue() );
        }
        else if (evt.getPropertyName().equals(JRDesignThermometerPlot.PROPERTY_MEDIUM_RANGE))
        {
                this.firePropertyChange( "MEDIUM_RANGE_" + JRDesignDataRange.PROPERTY_HIGH_EXPRESSION, evt.getOldValue(), evt.getNewValue() );
                this.firePropertyChange( "MEDIUM_RANGE_" + JRDesignDataRange.PROPERTY_LOW_EXPRESSION, evt.getOldValue(), evt.getNewValue() );
        }
        else if (evt.getPropertyName().equals(JRDesignThermometerPlot.PROPERTY_HIGH_RANGE))
        {
                this.firePropertyChange( "HIGH_RANGE_" + JRDesignDataRange.PROPERTY_HIGH_EXPRESSION, evt.getOldValue(), evt.getNewValue() );
                this.firePropertyChange( "HIGH_RANGE_" + JRDesignDataRange.PROPERTY_LOW_EXPRESSION, evt.getOldValue(), evt.getNewValue() );
        }
        else if (evt.getPropertyName().equals(JRDesignMeterPlot.PROPERTY_VALUE_DISPLAY) ||
                 evt.getPropertyName().equals(JRDesignThermometerPlot.PROPERTY_VALUE_DISPLAY))
        {
                this.firePropertyChange( JRDesignValueDisplay.PROPERTY_FONT, evt.getOldValue(), evt.getNewValue() );
                this.firePropertyChange( JRDesignValueDisplay.PROPERTY_MASK, evt.getOldValue(), evt.getNewValue() );
                this.firePropertyChange( JRDesignValueDisplay.PROPERTY_COLOR, evt.getOldValue(), evt.getNewValue() );
        }
        else if (evt.getPropertyName().equals(JRBasePen.PROPERTY_LINE_COLOR) ||
                 evt.getPropertyName().equals(JRBasePen.PROPERTY_LINE_STYLE) ||
                 evt.getPropertyName().equals(JRBasePen.PROPERTY_LINE_WIDTH))
        {
            
            if (ModelUtils.containsProperty(this.getPropertySets(),"pen"))
            {
                this.firePropertyChange("pen", evt.getOldValue(), evt.getNewValue() );
            }
            
            if (ModelUtils.containsProperty(this.getPropertySets(),"linebox"))
            {
                this.firePropertyChange("linebox", evt.getOldValue(), evt.getNewValue() );
            }
        }
        else if (evt.getPropertyName().equals(JRBaseLineBox.PROPERTY_BOTTOM_PADDING) ||
                 evt.getPropertyName().equals(JRBaseLineBox.PROPERTY_BOTTOM_PADDING) ||
                 evt.getPropertyName().equals(JRBaseLineBox.PROPERTY_BOTTOM_PADDING) ||
                 evt.getPropertyName().equals(JRBaseLineBox.PROPERTY_BOTTOM_PADDING))
        {
            if (ModelUtils.containsProperty(this.getPropertySets(),"linebox"))
            {
                this.firePropertyChange("linebox", evt.getOldValue(), evt.getNewValue() );
            }
        }
        else if (evt.getPropertyName().equals( JRDesignChartDataset.PROPERTY_DATASET_RUN))
        {
            // Update the dataset context used in the properties....
           
            
            

            if (element instanceof JRDesignChart)
            {
                PropertySet[] sets = this.getPropertySets();
                JRDesignChart chart = (JRDesignChart)element;

                JRDesignDataset newDataset = jd.getMainDesignDataset();

                if (chart.getDataset() != null &&
                    chart.getDataset().getDatasetRun() != null &&
                    chart.getDataset().getDatasetRun().getDatasetName() != null)
                {
                    String dsname = chart.getDataset().getDatasetRun().getDatasetName();
                    if (jd.getDatasetMap().containsKey(dsname))
                    {
                        newDataset = (JRDesignDataset)jd.getDatasetMap().get(dsname);
                    }
                }
                


                
                for (int i=0; i<sets.length; ++i)
                {
                    if (sets[i].getName().equals("CHART_PLOT_PROPERTIES"))
                    {
                        Node.Property[] pp = sets[i].getProperties();
                        for (int j=0; j<pp.length; ++j)
                        {
                            if (pp[j].getValue(ExpressionContext.ATTRIBUTE_EXPRESSION_CONTEXT) != null ||
                                pp[j] instanceof ExpressionProperty)
                            {

                                pp[j].setValue(ExpressionContext.ATTRIBUTE_EXPRESSION_CONTEXT,new ExpressionContext(newDataset));
                            }
                        }
                    }
                }
            }
        }
        
        if (ModelUtils.containsProperty(  this.getPropertySets(), evt.getPropertyName()))
        {
            this.firePropertyChange(evt.getPropertyName(), evt.getOldValue(), evt.getNewValue() );
        }
    }

    public boolean hasExpression(JRDesignExpression ex) {
        
        HasExpressionVisitor hasExpressionVisitor = new HasExpressionVisitor(jd,ex);
        return hasExpressionVisitor.hasExpression(element);
    }

    public ExpressionContext getExpressionContext(JRDesignExpression ex) {
        
        
        // The chart is a bit hard to handle. There are some expressions that
        // always refer to the main dataset (in general all the one used in
        // the dataset run, others depending by the dataset set in the dataset run.
        // So if the dataset run uses a particular dataset, the expression context
        // should use it.
        if (element instanceof JRDesignChart)
        {
            JRDesignChart chart = (JRDesignChart)element;
            if (chart.getDataset().getDatasetRun() != null &&
                chart.getDataset().getDatasetRun().getDatasetName() != null)
            {
                // The dataset run uses a different dataset.
                // so let's check if the expression is one of the dataset run or if it
                // belongs to the chart.
                if (chart.getDataset().getDatasetRun().getConnectionExpression() != ex &&
                     chart.getDataset().getDatasetRun().getDataSourceExpression() != ex &&
                     chart.getDataset().getDatasetRun().getParametersMapExpression() != ex)
                {
                    boolean found = false;
                    JRDatasetParameter[] params = chart.getDataset().getDatasetRun().getParameters();
                    for (int i=0; i<params.length; ++i)
                    {
                        if (params[i].getExpression() == ex)
                        {
                            found = true;
                            break;
                        }
                    }
                    
                    if (!found)
                    {
                        return new ExpressionContext( (JRDesignDataset)jd.getDatasetMap().get(chart.getDataset().getDatasetRun().getDatasetName()));
                    }
                }
            }
        }
        
        // For crosstabs the discussion is similar...
        
        // Usually this is the element expression context...
        return new ExpressionContext(ModelUtils.getElementDataset(element, jd));
        
        
    }


    @Override
    public PasteType getDropType(Transferable t, final int action, int index) {
        
        Node dropNode = NodeTransfer.node(t, DnDConstants.ACTION_COPY_OR_MOVE + NodeTransfer.CLIPBOARD_CUT);
        Node[] dropNodes = NodeTransfer.nodes(t, DnDConstants.ACTION_COPY_OR_MOVE + NodeTransfer.CLIPBOARD_CUT);
        int dropAction = DnDUtilities.getTransferAction(t);

        if (dropNode == null)
        {
            ElementPasteType.setLastPastedNodes(dropNodes);
        }

        if (null != dropNode && !(dropNode instanceof NotRealElementNode)) {
            JRDesignElement element = dropNode.getLookup().lookup(JRDesignElement.class);

            if (null != element) {

                return new ElementPasteType( element.getElementGroup(),
                                             getElement().getElementGroup(),
                                             element,dropAction,this);
            }

            if (dropNode instanceof ElementGroupNode)
            {
                JRDesignElementGroup g = ((ElementGroupNode)dropNode).getElementGroup();
                return new ElementPasteType( g.getElementGroup(),
                                             getElement().getElementGroup(),
                                             g,dropAction,this);
            }
            else
            {

            }
        }
        return null;
    }

    @SuppressWarnings("unchecked")
    @Override
    protected void createPasteTypes(Transferable t, List s) {
        super.createPasteTypes(t, s);
        PasteType paste = getDropType(t, DnDConstants.ACTION_MOVE, -1);
        if (null != paste) {
            s.add(paste);
        }
    }

    @Override
    public Object getValue(String attributeName) {
        if ("customDelete".equals(attributeName))
        {
            return new Boolean(IReportManager.getPreferences().getBoolean("noConfirmElementDelete", true));
        }
        return super.getValue(attributeName);
    }



}
