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table sorter

ReenaWadhwa
Advisor
Advisor
0 Kudos

Hi,

i have to implement a table sorter in one of my webdypro application. I have done all the steps mentioned in one of the blog and have also imported TableSorter.java class. i am getting sorting icons in column headers. but on clicking icon nothing happens...i think there is some problem with the java class which i have imported. So can anybody provide the code of tablesorter.java class.

Thanks in advance,

Reena

Accepted Solutions (1)

Accepted Solutions (1)

Former Member
0 Kudos

Hi,

There can not be any problem in the TableSorter.java class.I think there is some problem with your implementation.Can you post the code which you have given inside the wdDoModifyView() and Table Sorter action handler methods.

Regards,

Sudhir

Answers (4)

Answers (4)

ReenaWadhwa
Advisor
Advisor
0 Kudos

thanks for all the comments...i changed the java class code. Now it is working fine...

former_member751941
Active Contributor
0 Kudos

Hi Reena,

Here is the code.Just change the package name.

/*
 * Created on Sep 6, 2007
 *
 * To change the template for this generated file go to
 * Window>Preferences>Java>Code Generation>Code and Comments
 */
package ibm.com.tradefund.utils;

/**
 * @author Administrator
 *
 * To change the template for this generated type comment go to
 * Window>Preferences>Java>Code Generation>Code and Comments
 */
import java.text.Collator;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Comparator;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.StringTokenizer;

import com.sap.tc.webdynpro.clientserver.uielib.standard.api.IWDAbstractDropDownByIndex;
import com.sap.tc.webdynpro.clientserver.uielib.standard.api.IWDAbstractDropDownByKey;
import com.sap.tc.webdynpro.clientserver.uielib.standard.api.IWDAbstractInputField;
import com.sap.tc.webdynpro.clientserver.uielib.standard.api.IWDAbstractTableColumn;
import com.sap.tc.webdynpro.clientserver.uielib.standard.api.IWDCaption;
import com.sap.tc.webdynpro.clientserver.uielib.standard.api.IWDCheckBox;
import com.sap.tc.webdynpro.clientserver.uielib.standard.api.IWDLink;
import com.sap.tc.webdynpro.clientserver.uielib.standard.api.IWDProgressIndicator;
import com.sap.tc.webdynpro.clientserver.uielib.standard.api.IWDRadioButton;
import com.sap.tc.webdynpro.clientserver.uielib.standard.api.IWDTable;
import com.sap.tc.webdynpro.clientserver.uielib.standard.api.IWDTableCellEditor;
import com.sap.tc.webdynpro.clientserver.uielib.standard.api.IWDTableColumn;
import com.sap.tc.webdynpro.clientserver.uielib.standard.api.IWDTableColumnGroup;
import com.sap.tc.webdynpro.clientserver.uielib.standard.api.IWDTextEdit;
import com.sap.tc.webdynpro.clientserver.uielib.standard.api.IWDTextView;
import com.sap.tc.webdynpro.clientserver.uielib.standard.api.WDTableColumnSortDirection;
import com.sap.tc.webdynpro.progmodel.api.IWDAction;
import com.sap.tc.webdynpro.progmodel.api.IWDCustomEvent;
import com.sap.tc.webdynpro.progmodel.api.IWDNode;
import com.sap.tc.webdynpro.progmodel.api.IWDNodeElement;
import com.sap.tc.webdynpro.progmodel.api.IWDViewElement;
import com.sap.tc.webdynpro.services.sal.localization.api.WDResourceHandler;

/**
 * Helper class that makes a Web Dynpro table UI element sortable (column-wise).
 */
public final class TableSorter {
	/**
	 * @param table
	 * @param sortAction
	 * @param comparators
	 */
	
	/**
	 * Creates a table sorter for the given table using the given sort action.
	 * This constructor must be called from <code>wdDoModifyView()</code>, but
	 * usually only when that hook is called for the first time. Store the newly
	 * created instance in a context attribute with Java native type
	 * <code>com.sap.tc.webdynpro.tests.utils.TableSorter</code>.
	 * The given sort action's event handler will be bound to the <code>onSort</code>
	 * event of the table and must at least call this table sorter's
	 * <code>sort(wdEvent)</code> method.
	 * 
	 * Every column of the table is made sortable if possible according to the
	 * following rules.
	 * If a comparator is given for a column's ID and it is a
	 * <code>NodeElementByAttributeComparator</code>, then that comparator defines
	 * both the attribute and the ordering used to sort that column.
	 * If any other comparator is given and an attribute can be determined from
	 * that column's table cell editor, then that attribute is used to sort that
	 * column according to the ordering imposed by the given comparator.
	 * If no comparator is given but an attribute can be determined from
	 * that column's table cell editor, then that attribute is used to sort that
	 * column according to the natural ordering of that attribute's type.
	 * Else that column is left untouched.
	 * 
	 * Additionally it is possible to define the sortable columns by their 
	 * TableColumn UI element ids.
	 * 
	 * @see sort()
	 * @see NodeElementByAttributeComparator
	 * @see com.sap.tc.webdynpro.clientserver.uielib.standard.api.IWDTable
	 */
	public TableSorter(IWDTable table, IWDAction sortAction, Map comparators) {
		init(table, sortAction, comparators, null);
	}
	
	public TableSorter(IWDTable table, IWDAction sortAction, Map comparators, String[] sortableColumns) {
		init(table, sortAction, comparators, sortableColumns);
	}
	
	/**
	 * Initialisation stuff
	 */
	private void init(IWDTable table, IWDAction sortAction, Map comparators, String[] sortableColumns){
		this.table = table;
		if(sortableColumns == null){
			sortableCols = null;
		}else{
			sortableCols = new HashMap();
			for (int i = 0; i < sortableColumns.length; i++) {
				sortableCols.put(sortableColumns<i>, sortableColumns<i>);
			}
		}

		// sanity checks
		if (sortAction == null)
			throw new IllegalArgumentException("Sort action must be given");
		if (table == null)
			throw new IllegalArgumentException("Table must be given");
		if (table.bindingOfDataSource() == null)
			throw new IllegalArgumentException(
				"Data source of table with id '" + table.getId() + "' must be bound");

		// make the columns sortable
		String dataSourcePrefix = table.bindingOfDataSource() + ".";
		//TODO: remove the following line since this method is not longer available in later releases
		setComparatorsForColumns(dataSourcePrefix, table.iterateColumns(), comparators);
		setComparatorsForColumns(dataSourcePrefix, table.iterateGroupedColumns(), comparators);
		
		//set up the table properties
		table.setOnSort(sortAction);
		table.mappingOfOnSort().addSourceMapping(IWDTable.IWDOnSort.COL, "selectedColumn");
		table.mappingOfOnSort().addSourceMapping(IWDTable.IWDOnSort.DIRECTION, "sortDirection");	
	}
	
	/**
	 * Try to make the given columns sortable (recusivly, if necessary)
	 */
	private void setComparatorsForColumns(String dataSourcePrefix, Iterator columnIterator, Map comparators){
		int index = 0;
		for (Iterator it = columnIterator; it.hasNext(); ++index) { // for every column: try to make it bindable
			IWDAbstractTableColumn abstractColumn = (IWDAbstractTableColumn) it.next();
			if(abstractColumn instanceof IWDTableColumn){
				
				IWDTableColumn column = (IWDTableColumn)abstractColumn;
				if(sortableCols == null || sortableCols.containsKey(column.getId())){
					//try to make this column sortable
					Comparator comparator = null;
					if (comparators != null){
						comparator = (Comparator)comparators.get(column.getId());
					}
					
					NodeElementByAttributeComparator elementComparator = null;	
					if (comparator instanceof NodeElementByAttributeComparator) {
						// the easy one, attribute and ordering are given
						elementComparator = (NodeElementByAttributeComparator)comparator;
					} else { // attribute must be determined
						String bindingOfPrimaryProperty = bindingOfPrimaryProperty(column.getTableCellEditor());
						if (bindingOfPrimaryProperty == null || !bindingOfPrimaryProperty.startsWith(dataSourcePrefix)){
							//no attribute found or outside of data source
							column.setSortState(WDTableColumnSortDirection.NOT_SORTABLE);
							continue;
						}
						String attributeName = bindingOfPrimaryProperty.substring(dataSourcePrefix.length());
						Collection subnodes = new ArrayList();
						if (attributeName.indexOf('.') >= 0){
							//attribute not immediately below data source
							String[] tokens = tokenize (attributeName, ".");
							for(int i=0; i<tokens.length-1; i++){
								subnodes.add(tokens<i>);
							}
							attributeName = tokens[tokens.length-1];
						}
						if(subnodes.size() == 0){
							elementComparator = new NodeElementByAttributeComparator(attributeName, comparator);
						}else{
							elementComparator = new NodeElementByAttributeComparator(attributeName, comparator, subnodes);
						}
					}
		
					// set up internal data structures
					comparatorForColumn.put(column, elementComparator);
					
					//set sort state
					column.setSortState(WDTableColumnSortDirection.NONE);
				}else{
					//column should not be sortable
					column.setSortState(WDTableColumnSortDirection.NOT_SORTABLE);
				}
				
			}else if (abstractColumn instanceof IWDTableColumnGroup){
				//it's just a column group -> try to bind the columns of the column group
				IWDTableColumnGroup columnGroup = (IWDTableColumnGroup)abstractColumn;
				setComparatorsForColumns(dataSourcePrefix, columnGroup.iterateColumns(), comparators);
			}
			
		}		
	}
	
	/**
	 * Tokenizes the input string according to the given delimiters. The delimiters will be left out.
	 * Example: tokenize("Hello_World", "_") results ["Hello", "World"]
	 */
	private String[] tokenize (String input, String delim){
		StringTokenizer tokenizer = new StringTokenizer(input, delim);
		String[] tokens = new String[tokenizer.countTokens()];
		int index = 0;
		while(tokenizer.hasMoreTokens()){
			tokens[index] = tokenizer.nextToken();
			index++;
		}
		return tokens;
	}

	/**
	 * This method must be called from the event handler of this table sorter's
	 * sort action. It performs the actual sort operation.
	 */
	public void sort(IWDCustomEvent wdEvent, IWDNode dataSource) {
		// find the things we need
		String columnId = wdEvent.getString("selectedColumn");
		String direction = wdEvent.getString("sortDirection");
		IWDTableColumn column = (IWDTableColumn) table.getView().getElement(columnId);
		NodeElementByAttributeComparator elementComparator = (NodeElementByAttributeComparator) comparatorForColumn.get(column);
		
		if (elementComparator == null){
			//not a sortable column
			column.setSortState(WDTableColumnSortDirection.NOT_SORTABLE);
			return; 
		}
		
		// sorting
		elementComparator.setSortDirection(WDTableColumnSortDirection.valueOf(direction));
		dataSource.sortElements(elementComparator);
	}

	/**
	 * Returns the binding of the given table cell editor's property that is
	 * considered "primary" or <code>null</code> if no such binding exists or no
	 * such property can be determined.
	 */
	private static final String bindingOfPrimaryProperty(IWDTableCellEditor editor) {
		return editor instanceof IWDViewElement ? bindingOfPrimaryProperty((IWDViewElement) editor) : null;
	}

	/**
	 * Returns the binding of the given view element's property that is
	 * considered "primary" or <code>null</code> if no such binding exists or no
	 * such property can be determined.
	 */
	private static final String bindingOfPrimaryProperty(IWDViewElement element) {
		if (element instanceof IWDAbstractDropDownByIndex)
			return ((IWDAbstractDropDownByIndex) element).bindingOfTexts();
		if (element instanceof IWDAbstractDropDownByKey)
			return ((IWDAbstractDropDownByKey) element).bindingOfSelectedKey();
		if (element instanceof IWDAbstractInputField)
			return ((IWDAbstractInputField) element).bindingOfValue();
		if (element instanceof IWDCaption)
			return ((IWDCaption) element).bindingOfText();
		if (element instanceof IWDCheckBox)
			return ((IWDCheckBox) element).bindingOfChecked();
		if (element instanceof IWDLink)
			return ((IWDLink) element).bindingOfText();
		if (element instanceof IWDProgressIndicator)
			return ((IWDProgressIndicator) element).bindingOfPercentValue();
		if (element instanceof IWDRadioButton)
			return ((IWDRadioButton) element).bindingOfSelectedKey();
		if (element instanceof IWDTextEdit)
			return ((IWDTextEdit) element).bindingOfValue();
		if (element instanceof IWDTextView)
			return ((IWDTextView) element).bindingOfText();

		return null;
	}

	/**
	 * Instance of a comparator according to the ordering imposed by the
	 * implementation of <code>Comparable</code>.
	 */
	private static final Comparator DEFAULT = new Comparator() {
		/**
		 * Compares the given objects according to the ordering imposed by the first
		 * ones <code>compareTo(Object)</code> function. Furthermore, <code>null</code>
		 * is treated to be less than any object.
		 * 
		 * @see java.lang.Comparable#compareTo(java.lang.Object)
		 * @see java.util.Comparator#compare(java.lang.Object, java.lang.Object)
		 */
		public int compare(Object o1, Object o2) {
			if (o1 == null && o2 == null)
				return 0;
			if (o1 == null)
				return -1;
			if (o2 == null)
				return +1;
			if (o1 instanceof Boolean && o2 instanceof Boolean)
				return o1.toString().compareTo(o2.toString()); // false < true
			if (o1 instanceof String && o2 instanceof String){
				//Use a Collator for sorting according to the given Locale
				Collator collate = Collator.getInstance(WDResourceHandler.getCurrentSessionLocale());
				return collate.compare(o1, o2);				
			}
			return ((Comparable) o1).compareTo((Comparable) o2);
		}
	};

	/**
	 * Map of table column to comparator (<code>ReversableComparator</code>)
	 * used for sorting that column (sortable columns only).
	 */
	private Map comparatorForColumn = new HashMap();

	/**
	 * The table to be sorted.
	 */
	private IWDTable table = null;
	
	/**
	 * Column-IDs of the columns, which should be sortable
	 */
	private Map sortableCols = null;

	/**
	 * Generic comparator that compares node elements by a given attribute with
	 * the help of a given comparator.
	 */
	public final class NodeElementByAttributeComparator implements Comparator {
		
		
		/**
		 * Creates a new comparator for the given attribute name that compares values
		 * of that attribute according to the natural ordering of that attribute's
		 * type (which must implement <code>java.lang.Comparable</code>).
		 */
		public NodeElementByAttributeComparator(String attributeName) {
			this(attributeName, null, false, new ArrayList());
		}

		/**
		 * Creates a new comparator for the given attribute name that compares values
		 * of that attribute with the help of the given comparator. If no comparator
		 * is given, the natural ordering of that attribute's type is used.
		 */
		public NodeElementByAttributeComparator(String attributeName, Comparator comparator) {
			this(attributeName, comparator, false, new ArrayList());
		}

		/**
		 * Creates a new comparator for the given attribute name that compares values
		 * of that attribute either as objects (i.e. "in internal format") or as text
		 * (i.e. "in external format") as indicated. The ordering is the natural
		 * ordering of that attribute's type (which must implement
		 * <code>java.lang.Comparable</code>) in case objects are compared or the
		 * natural ordering of <code>java.lang.String</code> in case texts are compared.
		 */
		public NodeElementByAttributeComparator(String attributeName, boolean compareAsText) {
			this(attributeName, null, compareAsText, new ArrayList());
		}
		
		/**
		 * Creates a new comparator for the given attribute name that compares values
		 * of that attribute according to the natural ordering of that attribute's
		 * type (which must implement <code>java.lang.Comparable</code>). In addition it is possible 
		 * to define the path to a child node with the <code>java.util.Collection</code> subnodes.
		 * (List of child node names in the correct order)
		 */
		public NodeElementByAttributeComparator(String attributeName, Collection subnodes) {
			this(attributeName, null, false, subnodes);
		}

		/**
		 * Creates a new comparator for the given attribute name that compares values
		 * of that attribute with the help of the given comparator. If no comparator
		 * is given, the natural ordering of that attribute's type is used. In addition it is possible 
		 * to define the path to a child node with the <code>java.util.Collection</code> subnodes.
		 * (List of child node names in the correct order)
		 */
		public NodeElementByAttributeComparator(String attributeName, Comparator comparator, Collection subnodes) {
			this(attributeName, comparator, false, subnodes);
		}

		/**
		 * Creates a new comparator for the given attribute name that compares values
		 * of that attribute either as objects (i.e. "in internal format") or as text
		 * (i.e. "in external format") as indicated. The ordering is the natural
		 * ordering of that attribute's type (which must implement
		 * <code>java.lang.Comparable</code>) in case objects are compared or the
		 * natural ordering of <code>java.lang.String</code> in case texts are compared. In addition it is possible 
		 * to define the path to a child node with the <code>java.util.Collection</code> subnodes.
		 * (List of child node names in the correct order)
		 */
		public NodeElementByAttributeComparator(String attributeName, boolean compareAsText, Collection subnodes) {
			this(attributeName, null, compareAsText, subnodes);
		}

		/**
		 * Internal constructor.
		 */
		private NodeElementByAttributeComparator(
			String attributeName,
			Comparator comparator,
			boolean compareAsText,
			Collection subNodes) {
			if (attributeName == null)
				throw new IllegalArgumentException("Attribute name must not be null");
			if (comparator == null)
				comparator = DEFAULT;

			this.attributeName = attributeName;
			this.comparator = comparator;
			this.compareAsText = compareAsText;
			this.sortDirection = true;
			this.subNodes = subNodes;
		}
		
		/**
		 * Sets the sort direction of this comparator to the given direction. The comparator sort in ascending order by default.
		 * @see com.sap.tc.webdynpro.clientserver.uielib.standard.api.WDTableColumnSortDirection
		 */
		public void setSortDirection(WDTableColumnSortDirection direction){
			if(direction.equals(WDTableColumnSortDirection.UP)){
				sortDirection = true;
			}else if(direction.equals(WDTableColumnSortDirection.DOWN)){
				sortDirection = false;
			}
		}

		/**
		 * Compares the given objects which must be instances of <code>IWDNodeElement</code>
		 * according to the values of the attribute given at construction time
		 * with the help of the comparator given at construction time.
		 * 
		 * @see java.util.Comparator#compare(java.lang.Object, java.lang.Object)
		 * @see com.sap.tc.webdynpro.progmodel.api.IWDNodeElement
		 */
		public int compare(Object o1, Object o2) {
			IWDNodeElement element1 = (IWDNodeElement) o1;
			IWDNodeElement element2 = (IWDNodeElement) o2;
			if(subNodes.size() > 0){
				element1 = getSubNodeElement(element1, 0);
				element2 = getSubNodeElement(element2, 0);
			}
			Object attributeValue1 = null;
			Object attributeValue2 = null;
			if(element1 != null){
				attributeValue1 =
					compareAsText
						? element1.getAttributeAsText(attributeName)
						: element1.getAttributeValue(attributeName);
			}
			if(element2 != null){
				attributeValue2 =
					compareAsText
						? element2.getAttributeAsText(attributeName)
						: element2.getAttributeValue(attributeName);
			}

			if(sortDirection){
				return comparator.compare(attributeValue1, attributeValue2);
			}else{
				return comparator.compare(attributeValue2, attributeValue1);
			}
		}
		
		/**
		 * Determines recursivly the child node, which have an attribute with the given name.
		 * The path to this child node must be specified in the subnodes property of this comparator.
		 * Start this method with index = 0.
		 */
		private IWDNodeElement getSubNodeElement(IWDNodeElement currentElement, int index){
			if(currentElement == null || index >= subNodes.size()){
				//end of recursion
				return currentElement;
			}else{
				return getSubNodeElement(currentElement.node().getChildNode((String)subNodes.toArray()[index], currentElement.index()).getCurrentElement(), index+1);
				//return getSubNodeElement(currentElement.node().getChildNode((String)subNodes.toArray()[index], currentElement.index()).getElementAt(0), index+1);
			}
		}

		/**
		 * Name of the attribute used for comparisons.
		 */
		private final String attributeName;

		/**
		 * Comparator used for comparing the attribute's values.
		 */
		private final Comparator comparator;

		/**
		 * Indicates whether attribute values are compared as text (as opposed to
		 * "as objects").
		 */
		private final boolean compareAsText;
		
		/**
		 * Sort direction (true = ascending order, false = descending order)
		 */
		private boolean sortDirection;
		
		/**
		 * List of child node names
		 * (Description of the path from the given context node to the specified attribute)
		 */
		private Collection subNodes;
	}

}

Regards,

Mithu

Former Member
0 Kudos

Hi,

Pl go through this article which contains a sample project with table sorter class

https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/90ac0015-d1c5-2a10-d788-aed89990...

Regards

Ayyapparaj

Former Member
0 Kudos

Hi,

Change the package name what you are using.

package com.sap.tc.webdynpro.tests.utils;

import java.util.Comparator;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

import com.sap.tc.webdynpro.clientserver.uielib.standard.api.IWDAbstractDropDownByIndex;
import com.sap.tc.webdynpro.clientserver.uielib.standard.api.IWDAbstractDropDownByKey;
import com.sap.tc.webdynpro.clientserver.uielib.standard.api.IWDAbstractInputField;
import com.sap.tc.webdynpro.clientserver.uielib.standard.api.IWDCaption;
import com.sap.tc.webdynpro.clientserver.uielib.standard.api.IWDCheckBox;
import com.sap.tc.webdynpro.clientserver.uielib.standard.api.IWDLink;
import com.sap.tc.webdynpro.clientserver.uielib.standard.api.IWDProgressIndicator;
import com.sap.tc.webdynpro.clientserver.uielib.standard.api.IWDRadioButton;
import com.sap.tc.webdynpro.clientserver.uielib.standard.api.IWDTable;
import com.sap.tc.webdynpro.clientserver.uielib.standard.api.IWDTableCellEditor;
import com.sap.tc.webdynpro.clientserver.uielib.standard.api.IWDTableColumn;
import com.sap.tc.webdynpro.clientserver.uielib.standard.api.IWDTextEdit;
import com.sap.tc.webdynpro.clientserver.uielib.standard.api.IWDTextView;
import com.sap.tc.webdynpro.progmodel.api.IWDAction;
import com.sap.tc.webdynpro.progmodel.api.IWDCustomEvent;
import com.sap.tc.webdynpro.progmodel.api.IWDNode;
import com.sap.tc.webdynpro.progmodel.api.IWDNodeElement;
import com.sap.tc.webdynpro.progmodel.api.IWDViewElement;

/**
 * Helper class that makes a Web Dynpro table UI element sortable (column-wise).
 */
public final class TableSorter {
	/**
	 * Creates a table sorter for the given table using the given sort action.
	 * This constructor must be called from <code>wdDoModifyView()</code>, but
	 * usually only when that hook is called for the first time. Store the newly
	 * created instance in a context attribute with Java native type
	 * <code>com.sap.tc.webdynpro.tests.utils.TableSorter</code>.
	 * The given sort action's event handler will be bound to the <code>onAction</code>
	 * event of sortable columns and must at least call this table sorter's
	 * <code>sort(wdEvent)</code> method.
	 * 
	 * Every column of the table is made sortable if possible according to the
	 * following rules.
	 * If a comparator is given for a column's index and it is a
	 * <code>NodeElementByAttributeComparator</code>, then that comparator defines
	 * both the attribute and the ordering used to sort that column.
	 * If any other comparator is given and an attribute can be determined from
	 * that column's table cell editor, then that attribute is used to sort that
	 * column according to the ordering imposed by the given comparator.
	 * If no comparator is given but an attribute can be determined from
	 * that column's table cell editor, then that attribute is used to sort that
	 * column according to the natural ordering of that attribute's type.
	 * Else that column is left untouched.
	 * 
	 * When a column is made sortable its <code>onAction</code> event (incl.
	 * parameter mapping) is changed. Furthermore if a header is present for that
	 * column then the header's <code>imageSource</code> property is also changed
	 * to indicate the currently sorted column and its sort direction.
	 * 
	 * @see sort()
	 * @see NodeElementByAttributeComparator
	 * @see com.sap.tc.webdynpro.clientserver.uielib.standard.api.IWDTable
	 */
	public TableSorter(IWDTable table, IWDAction sortAction, Comparator[] comparators) {
		this.table = table;

		// sanity checks
		if (sortAction == null)
			throw new IllegalArgumentException("Sort action must be given");
		if (table == null)
			throw new IllegalArgumentException("Table must be given");
		if (table.bindingOfDataSource() == null)
			throw new IllegalArgumentException(
				"Data source of table with id '" + table.getId() + "' must be bound");

		String dataSourcePrefix = table.bindingOfDataSource() + ".";
		int index = 0;
		for (Iterator it = table.iterateColumns();
			it.hasNext();
			++index) { // for every column: try to make it bindable
			IWDTableColumn column = (IWDTableColumn) it.next();
			Comparator comparator = null;
			if (comparators != null && index < comparators.length)
				comparator = comparators[index];
			ReversableComparator reversable = null;

			if (comparator instanceof NodeElementByAttributeComparator) {
				// the easy one, attribute and ordering are given
				reversable = new ReversableComparator(comparator);
			} else { // attribute must be determined
				String bindingOfPrimaryProperty = bindingOfPrimaryProperty(column.getTableCellEditor());
				if (bindingOfPrimaryProperty == null || !bindingOfPrimaryProperty.startsWith(dataSourcePrefix))
					continue; // no attribute found or outside of data source
				String attributeName = bindingOfPrimaryProperty.substring(dataSourcePrefix.length());
				if (attributeName.indexOf('.') >= 0)
					continue; // attribute not immediately below data source (TODO handle this)

				reversable =
					new ReversableComparator(new NodeElementByAttributeComparator(attributeName, comparator));
			}

			// set up internal data structures
			comparatorForColumn.put(column, reversable);

			// prepare table column
			//column.setOnAction(sortAction);
			//column.mappingOfOnAction().addSourceMapping("col", "col");
			if (column.getHeader() != null)
				column.getHeader().setImageSource(null);
		}
	}

	/**
	 * This method must be called from the event handler of this table sorter's
	 * sort action. It performs the actual sort operation.
	 */
	public void sort(IWDCustomEvent wdEvent, IWDNode dataSource,String columnName) {
		// find the things we need
		String columnId ;
		if(columnName == null)
		{
			columnId = wdEvent.getString("col");
		}
		else
		{
			columnId = columnName;	
		}
		IWDTableColumn column = (IWDTableColumn) table.getView().getElement(columnId);
		ReversableComparator reversable = (ReversableComparator) comparatorForColumn.get(column);
		if (reversable == null)
			return; // not a sortable column

		// remove icon of previously sorted column
		if (currentlySortedColumn != null && currentlySortedColumn.getHeader() != null)
			currentlySortedColumn.getHeader().setImageSource(null);

		// bookkeeping
		if (column == currentlySortedColumn)
			reversable.toggleReversed();
		currentlySortedColumn = column;

		// set icon in currently sorted column
//		if (currentlySortedColumn.getHeader() != null)
//			currentlySortedColumn.getHeader().setImageSource(
//				reversable.isReversed() ? "~sapicons/s_b_srtd.GIF" : "~sapicons/s_b_srtu.GIF");

		// sorting
		dataSource.sortElements(reversable);
	}

	/**
	 * Returns the binding of the given table cell editor's property that is
	 * considered "primary" or <code>null</code> if no such binding exists or no
	 * such property can be determined.
	 */
	private static final String bindingOfPrimaryProperty(IWDTableCellEditor editor) {
		return editor instanceof IWDViewElement ? bindingOfPrimaryProperty((IWDViewElement) editor) : null;
	}

	/**
	 * Returns the binding of the given view element's property that is
	 * considered "primary" or <code>null</code> if no such binding exists or no
	 * such property can be determined.
	 */
	private static final String bindingOfPrimaryProperty(IWDViewElement element) {
		if (element instanceof IWDAbstractDropDownByIndex)
			return ((IWDAbstractDropDownByIndex) element).bindingOfTexts();
		if (element instanceof IWDAbstractDropDownByKey)
			return ((IWDAbstractDropDownByKey) element).bindingOfSelectedKey();
		if (element instanceof IWDAbstractInputField)
			return ((IWDAbstractInputField) element).bindingOfValue();
		if (element instanceof IWDCaption)
			return ((IWDCaption) element).bindingOfText();
		if (element instanceof IWDCheckBox)
			return ((IWDCheckBox) element).bindingOfChecked();
		if (element instanceof IWDLink)
			return ((IWDLink) element).bindingOfText();
		if (element instanceof IWDProgressIndicator)
			return ((IWDProgressIndicator) element).bindingOfPercentValue();
		if (element instanceof IWDRadioButton)
			return ((IWDRadioButton) element).bindingOfSelectedKey();
		if (element instanceof IWDTextEdit)
			return ((IWDTextEdit) element).bindingOfValue();
		if (element instanceof IWDTextView)
			return ((IWDTextView) element).bindingOfText();

		return null;
	}

	/**
	 * Instance of a comparator according to the ordering imposed by the
	 * implementation of <code>Comparable</code>.
	 */
	private static final Comparator DEFAULT = new Comparator() {
		/**
		 * Compares the given objects according to the ordering imposed by the first
		 * ones <code>compareTo(Object)</code> function. Furthermore, <code>null</code>
		 * is treated to be less than any object.
		 * 
		 * @see java.lang.Comparable#compareTo(java.lang.Object)
		 * @see java.util.Comparator#compare(java.lang.Object, java.lang.Object)
		 */
		public int compare(Object o1, Object o2) {
			if (o1 == null && o2 == null)
				return 0;
			if (o1 == null)
				return -1;
			if (o2 == null)
				return +1;
			if (o1 instanceof Boolean && o2 instanceof Boolean)
				return o1.toString().compareTo(o2.toString()); // false < true 
			if (o1 instanceof String && o2 instanceof String)
					return o1.toString().compareToIgnoreCase(o2.toString()); 
			return ((Comparable) o1).compareTo((Comparable) o2);
		}
	};

	/**
	 * Map of table column to comparator (<code>ReversableComparator</code>)
	 * used for sorting that column (sortable columns only).
	 */
	private final Map comparatorForColumn = new HashMap();

	/**
	 * Column that is currently sorted.
	 */
	private IWDTableColumn currentlySortedColumn;

	/**
	 * The table to be sorted.
	 */
	private final IWDTable table;

	/**
	 * Generic comparator that compares node elements by a given attribute with
	 * the help of a given comparator.
	 */
	public final class NodeElementByAttributeComparator implements Comparator {
		/**
		 * Creates a new comparator for the given attribute name that compares values
		 * of that attribute according to the natural ordering of that attribute's
		 * type (which must implement <code>java.lang.Comparable</code>).
		 */
		public NodeElementByAttributeComparator(String attributeName) {
			this(attributeName, null, false);
		}

		/**
		 * Creates a new comparator for the given attribute name that compares values
		 * of that attribute with the help of the given comparator. If no comparator
		 * is given, the natural ordering of that attribute's type is used.
		 */
		public NodeElementByAttributeComparator(String attributeName, Comparator comparator) {
			this(attributeName, comparator, false);
		}

		/**
		 * Creates a new comparator for the given attribute name that compares values
		 * of that attribute either as objects (i.e. "in internal format") or as text
		 * (i.e. "in external format") as indicated. The ordering is the natural
		 * ordering of that attribute's type (which must implement
		 * <code>java.lang.Comparable</code>) in case objects are compared or the
		 * natural ordering of <code>java.lang.String</code> in case texts are compared.
		 */
		public NodeElementByAttributeComparator(String attributeName, boolean compareAsText) {
			this(attributeName, null, compareAsText);
		}

		/**
		 * Internal constructor.
		 */
		private NodeElementByAttributeComparator(
			String attributeName,
			Comparator comparator,
			boolean compareAsText) {
			if (attributeName == null)
				throw new IllegalArgumentException("Attribute name must not be null");
			if (comparator == null)
				comparator = DEFAULT;

			this.attributeName = attributeName;
			this.comparator = comparator;
			this.compareAsText = compareAsText;
		}

		/**
		 * Compares the given objects which must be instances of <code>IWDNodeElement</code>
		 * according to the values of the attribute given at construction time
		 * with the help of the comparator given at construction time.
		 * 
		 * @see java.util.Comparator#compare(java.lang.Object, java.lang.Object)
		 * @see com.sap.tc.webdynpro.progmodel.api.IWDNodeElement
		 */
		public int compare(Object o1, Object o2) {
			IWDNodeElement element1 = (IWDNodeElement) o1;
			IWDNodeElement element2 = (IWDNodeElement) o2;
			Object attributeValue1 =
				compareAsText
					? element1.getAttributeAsText(attributeName)
					: element1.getAttributeValue(attributeName);
			Object attributeValue2 =
				compareAsText
					? element2.getAttributeAsText(attributeName)
					: element2.getAttributeValue(attributeName);

			return comparator.compare(attributeValue1, attributeValue2);
		}

		/**
		 * Name of the attribute used for comparisons.
		 */
		private final String attributeName;

		/**
		 * Comparator used for comparing the attribute's values.
		 */
		private final Comparator comparator;

		/**
		 * Indicates whether attribute values are compared as text (as opposed to
		 * "as objects").
		 */
		private final boolean compareAsText;
	}

	/**
	 * Comparator that knows how to reverse another comparator's sort direction.
	 */
	private final class ReversableComparator implements Comparator {
		/**
		 * Creates a new reversable comparator for the given other comparator.
		 */
		public ReversableComparator(Comparator comparator) {
			if (comparator == null)
				throw new IllegalArgumentException("Comparator must not be null");

			this.comparator = comparator;
		}

		/**
		 * @see java.util.Comparator#compare(java.lang.Object, java.lang.Object)
		 */
		public int compare(Object o1, Object o2) {
			return reversed ? -comparator.compare(o1, o2) : comparator.compare(o1, o2);
		}

		/**
		 * Tells whether the other comparator's sort direction is reversed.
		 */
		public boolean isReversed() {
			return reversed;
		}

		/**
		 * Determines whether the other comparator's sort direction is reversed.
		 */
		public void setReversed(boolean reversed) {
			this.reversed = reversed;
		}

		/**
		 * Toggles the current "sort direction".
		 */
		public void toggleReversed() {
			reversed = !reversed;
		}

		/**
		 * The other comparator.
		 */
		private final Comparator comparator;

		/**
		 * Whether the other comparator's sort direction is reversed.
		 */
		private boolean reversed;
	}
}

With Regards,

Laksh.