org.jgraph.graph

Class DefaultGraphModel

Implemented Interfaces:
Serializable, GraphModel

public class DefaultGraphModel
extends UndoableEditSupport
implements Serializable, GraphModel

The default implementation of a graph model.

Nested Class Summary

static class
DefaultGraphModel.EmptyIterator
class
DefaultGraphModel.GraphModelEdit
An implementation of GraphModelChange that can be added to the model event.
class
DefaultGraphModel.GraphModelLayerEdit
An implementation of GraphViewChange.

Field Summary

protected boolean
asksAllowsChildren
Indicates whether isLeaf is based on a node's allowsChildren value.
protected AttributeMap
attributes
The model's own attributes as a map.
protected Iterator
emptyIterator
Default instance of an empty iterator.
protected EventListenerList
listenerList
The list of listeners that listen to the model.
protected boolean
removeEmptyGroups
Whether or not to remove group cells from the model when all of their children are removed
protected List
roots
Set that contains all root cells of this model.

Constructor Summary

DefaultGraphModel()
Constructs a model that is not an attribute store.
DefaultGraphModel(List roots, AttributeMap attributes)
Constructs a model that is not an attribute store.
DefaultGraphModel(List roots, AttributeMap attributes, ConnectionSet cs)
Constructs a model using the specified information to construct the cells, attributes and connection data.

Method Summary

boolean
acceptsSource(Object edge, Object port)
Returns true if port is a valid source for edge.
boolean
acceptsTarget(Object edge, Object port)
Returns true if port is a valid target for edge.
void
addGraphModelListener(GraphModelListener l)
Adds a listener for the GraphModelEvent posted after the graph changes.
void
beginUpdate()
Indicates the start of one level of an executable change
void
cellsChanged(Object[] cells)
Invoke this method after you've changed how the cells are to be represented in the graph.
protected Object
cloneCell(Object cellObj)
Creates a shallow copy of the cell including a copy of the user object.
static Object
cloneCell(GraphModel model, Object cell)
Returns a deep clone of the specified cell, including all children.
static Object[]
cloneCell(GraphModel model, Object[] cells)
Returns a deep clone of the specified cells, including all children.
Map
cloneCells(Object[] cells)
Returns a map of (cell, clone)-pairs for all cells.
protected Object
cloneUserObject(Object userObject)
Clones the user object.
protected void
connect(Object edge, Object port, boolean isSource, boolean insert)
Connects or disconnects the edge and port in this model based on remove.
boolean
contains(Object node)
Returns true if node or one of its ancestors is in the model.
static boolean
containsEdgeBetween(GraphModel model, Object v1, Object v2)
Returns true if the given vertices are conntected by a single edge in this document.
protected DefaultGraphModel.GraphModelEdit
createEdit(Object[] inserted, Object[] removed, Map attributes, ConnectionSet cs, ParentMap pm, UndoableEdit[] edits)
protected DefaultGraphModel.GraphModelLayerEdit
createLayerEdit(Object[] cells, int layer)
protected DefaultGraphModel.GraphModelEdit
createRemoveEdit(Object[] cells)
Returns an edit that represents a remove.
Iterator
edges(Object port)
Returns an iterator of the edges connected to port.
void
edit(Map attributes, ConnectionSet cs, ParentMap pm, UndoableEdit[] edits)
Shortcut to the new edit method which allows inserts and removes to go along with an edit.
void
edit(Object[] inserted, Object[] removed, Map attributes, ConnectionSet cs, ParentMap pm, UndoableEdit[] edits)
Applies attributes and the connection changes to the model.
void
endUpdate()
Indicates the end of the current level of an executable change
void
execute(ExecutableChange change)
Executes the specified executable change on this graph model
protected void
fireGraphChanged(Object source, GraphModelEvent.GraphModelChange edit)
static Object[]
getAll(GraphModel model)
Returns all cells of the model in an array.
Map
getAttributes()
Returns the graph model's attribute.
AttributeMap
getAttributes(Object node)
Returns a Map that represents the attributes for the specified cell.
Object
getChild(Object parent, int index)
Returns the child of parent at index index in the parent's child array.
int
getChildCount(Object parent)
Returns the number of children of parent .
ConnectionSet
getConnectionSet()
A shortcut method to create a connection set that represents the connections in this model.
static List
getDescendants(GraphModel model, Object[] cells)
Flattens the given array of root cells by adding the roots and their descandants.
static Object[]
getEdges(GraphModel model, Object cell, boolean incoming)
Returns the incoming or outgoing edges for cell.
static Set
getEdges(GraphModel model, Object[] cells)
Returns the set of all connected edges to cells or their descendants.
static Object[]
getEdgesBetween(GraphModel model, Object cell1, Object cell2, boolean directed)
Returns the edges between two specified ports or two specified vertices.
GraphModelListener[]
getGraphModelListeners()
Return an array of all GraphModelListeners that were added to this model.
static Object[]
getIncomingEdges(GraphModel model, Object cell)
Returns the incoming edges for cell.
int
getIndexOfChild(Object parent, Object child)
Returns the index of child in parent.
int
getIndexOfRoot(Object root)
Returns the index of root in the model.
static Object
getOpposite(GraphModel model, Object edge, Object cell)
static Object[]
getOutgoingEdges(GraphModel model, Object cell)
Returns the outgoing edges for cell.
Object
getParent(Object child)
Returns the parent of child in the model.
Object
getRootAt(int index)
Returns the root at index index in the model.
int
getRootCount()
Returns the number of roots in the model.
List
getRoots()
static Object[]
getRoots(GraphModel model)
Returns the roots of the specified model as an array.
static Object[]
getRoots(GraphModel model, Object[] cells)
Returns the roots in cells by checking if their parent is null.
static Collection
getRootsAsCollection(GraphModel model)
Returns the roots of the specified model as a collection.
Object
getSource(Object edge)
Returns the source of edge.
static Object
getSourceVertex(GraphModel model, Object edge)
Returns the source vertex of the edge by calling getParent on getSource on the specified model.
Object
getTarget(Object edge)
Returns the target of edge.
static Object
getTargetVertex(GraphModel model, Object edge)
Returns the target vertex of the edge by calling getParent on getTarget on the specified model.
static Object[]
getTopmostCells(GraphModel model, Object[] cells)
int
getUpdateLevel()
static Object
getUserObject(Object cell)
Deprecated. Use GraphModel.getValue(Object) instead.
Object
getValue(Object cell)
protected Map
handleAttributes(Map attributes)
Applies attributes to the cells specified as keys.
protected void
handleConnection(ConnectionSet.Connection c, boolean establish)
Inserts the specified connection into the model.
protected ConnectionSet
handleConnectionSet(ConnectionSet cs)
Applies connectionSet to the model.
protected Object[]
handleInsert(Object[] cells)
Inserts cells into the model.
protected ParentMap
handleParentMap(ParentMap parentMap)
Applies cells to the model.
protected Object[]
handleRemove(Object[] cells)
Removes cells from the model.
static boolean
hasAncestorIn(GraphModel model, Set parents, Object child)
Returns true if the specified child has an ancestor in parents.
void
insert(Object[] roots, Map attributes, ConnectionSet cs, ParentMap pm, UndoableEdit[] edits)
Inserts the roots and connections into the model.
boolean
isEdge(Object edge)
Returns true if edge is a valid edge.
static boolean
isGroup(GraphModel model, Object cell)
Checks whether the cell has at least one child which is not a port.
boolean
isLeaf(Object node)
Returns whether the specified node is a leaf node.
boolean
isPort(Object port)
Returns true if port is a valid port, possibly supporting edge connection.
boolean
isRemoveEmptyGroups()
static boolean
isVertex(GraphModel model, Object vertex)
Returns true if vertex is a valid vertex.
static Object[]
order(GraphModel model, Object[] cells)
Orders cells so that they reflect the model order.
void
remove(Object[] roots)
Removes cells from the model.
void
removeGraphModelListener(GraphModelListener l)
Removes a listener previously added with addGraphModelListener() .
protected void
setParent(Object child, Object parent)
Sets the parent of the specified cell.
void
setRemoveEmptyGroups(boolean removeEmptyGroups)
static void
setSourcePort(GraphModel model, Object edge, Object port)
Helper methods that connects the source of edge to port in model.
static void
setTargetPort(GraphModel model, Object edge, Object port)
Helper methods that connects the source of edge to port in model.
void
toBack(Object[] cells)
Sends cells to back.
void
toFront(Object[] cells)
Brings cells to front.
Object
valueForCellChanged(Object cell, Object newValue)
Applies the new value to the specified cell.

Field Details

asksAllowsChildren

protected boolean asksAllowsChildren
Indicates whether isLeaf is based on a node's allowsChildren value.

attributes

protected AttributeMap attributes
The model's own attributes as a map. Defaults to an empty Hashtable.

emptyIterator

protected Iterator emptyIterator
Default instance of an empty iterator.

listenerList

protected EventListenerList listenerList
The list of listeners that listen to the model.

removeEmptyGroups

protected boolean removeEmptyGroups
Whether or not to remove group cells from the model when all of their children are removed

roots

protected List roots
Set that contains all root cells of this model.

Constructor Details

DefaultGraphModel

public DefaultGraphModel()
Constructs a model that is not an attribute store.

DefaultGraphModel

public DefaultGraphModel(List roots,
                         AttributeMap attributes)
Constructs a model that is not an attribute store.

DefaultGraphModel

public DefaultGraphModel(List roots,
                         AttributeMap attributes,
                         ConnectionSet cs)
Constructs a model using the specified information to construct the cells, attributes and connection data.

Method Details

acceptsSource

public boolean acceptsSource(Object edge,
                             Object port)
Returns true if port is a valid source for edge. edge and port must be objects previously obtained from this data source.
Specified by:
acceptsSource in interface GraphModel
Returns:
true if port is a valid source for edge.

acceptsTarget

public boolean acceptsTarget(Object edge,
                             Object port)
Returns true if port is a valid target for edge. edge and port must be objects previously obtained from this data source.
Specified by:
acceptsTarget in interface GraphModel
Returns:
true if port is a valid target for edge.

addGraphModelListener

public void addGraphModelListener(GraphModelListener l)
Adds a listener for the GraphModelEvent posted after the graph changes.
Specified by:
addGraphModelListener in interface GraphModel
Parameters:
l - the listener to add

beginUpdate

public void beginUpdate()
Indicates the start of one level of an executable change
Specified by:
beginUpdate in interface GraphModel

cellsChanged

public void cellsChanged(Object[] cells)
Invoke this method after you've changed how the cells are to be represented in the graph.

cloneCell

protected Object cloneCell(Object cellObj)
Creates a shallow copy of the cell including a copy of the user object. Subclassers can override the cloneUserObject to provide a custom user object cloning mechanism.

cloneCell

public static Object cloneCell(GraphModel model,
                               Object cell)
Returns a deep clone of the specified cell, including all children.

cloneCell

public static Object[] cloneCell(GraphModel model,
                                 Object[] cells)
Returns a deep clone of the specified cells, including all children.

cloneCells

public Map cloneCells(Object[] cells)
Returns a map of (cell, clone)-pairs for all cells. In the new array, all references are replaced with references to the cloned cells (ie parent or anchor). This method does only include children which are in cells. Use JGraph.getDescendants to get a complete list of all children.
Specified by:
cloneCells in interface GraphModel

cloneUserObject

protected Object cloneUserObject(Object userObject)
Clones the user object. Helper method that is invoked from cloneCells. You must use cloneCells (or cloneCell for single cells) to get a deep copy of a clone. Subclassers must override this and valueForCellChanged to implement custom user objects. This implementation returns object.

connect

protected void connect(Object edge,
                       Object port,
                       boolean isSource,
                       boolean insert)
Connects or disconnects the edge and port in this model based on remove. Subclassers should override this to update connectivity datastructures.

contains

public boolean contains(Object node)
Returns true if node or one of its ancestors is in the model.
Specified by:
contains in interface GraphModel
Returns:
true if node is in the model

containsEdgeBetween

public static boolean containsEdgeBetween(GraphModel model,
                                          Object v1,
                                          Object v2)
Returns true if the given vertices are conntected by a single edge in this document.

createEdit

protected DefaultGraphModel.GraphModelEdit createEdit(Object[] inserted,
                                                      Object[] removed,
                                                      Map attributes,
                                                      ConnectionSet cs,
                                                      ParentMap pm,
                                                      UndoableEdit[] edits)

createLayerEdit

protected DefaultGraphModel.GraphModelLayerEdit createLayerEdit(Object[] cells,
                                                                int layer)

createRemoveEdit

protected DefaultGraphModel.GraphModelEdit createRemoveEdit(Object[] cells)
Returns an edit that represents a remove.

edges

public Iterator edges(Object port)
Returns an iterator of the edges connected to port. port must be a object previously obtained from this data source. This method never returns null.
Specified by:
edges in interface GraphModel
Parameters:
port - a port in the graph, obtained from this data source
Returns:
Iterator that represents the connected edges

edit

public void edit(Map attributes,
                 ConnectionSet cs,
                 ParentMap pm,
                 UndoableEdit[] edits)
Shortcut to the new edit method which allows inserts and removes to go along with an edit.
Specified by:
edit in interface GraphModel

edit

public void edit(Object[] inserted,
                 Object[] removed,
                 Map attributes,
                 ConnectionSet cs,
                 ParentMap pm,
                 UndoableEdit[] edits)
Applies attributes and the connection changes to the model. The initial edits that triggered the call are considered to be part of this transaction. The passed-in edits are executed if they implement the GraphModelEvent.ExecutableGraphChange interface in ascending array-order, after execution of the model change. Notifies the model- and undo listeners of the change. Note: If only edits is non-null, the edits are directly passed to the UndoableEditListeners. Note: The passed-in propertyMap may contains PortViews which must be turned into Points when stored in the model.

endUpdate

public void endUpdate()
Indicates the end of the current level of an executable change
Specified by:
endUpdate in interface GraphModel

execute

public void execute(ExecutableChange change)
Executes the specified executable change on this graph model
Specified by:
execute in interface GraphModel
Parameters:
change - the change to be executed

fireGraphChanged

protected void fireGraphChanged(Object source,
                                GraphModelEvent.GraphModelChange edit)

getAll

public static Object[] getAll(GraphModel model)
Returns all cells of the model in an array.
Returns:
Returns all cells in the model including all descandants.

getAttributes

public Map getAttributes()
Returns the graph model's attribute. Shortcut to getAttributes(null).
Returns:
attributes of node as a Map

getAttributes

public AttributeMap getAttributes(Object node)
Returns a Map that represents the attributes for the specified cell. This attributes have precedence over each view's attributes, regardless of isAttributeStore.
Specified by:
getAttributes in interface GraphModel
Returns:
attributes of node as a Map

getChild

public Object getChild(Object parent,
                       int index)
Returns the child of parent at index index in the parent's child array. parent must be a node previously obtained from this data source. This should not return null if index is a valid index for parent (that is index >= 0 && index <32getChildCount( parent )).
Specified by:
getChild in interface GraphModel
Parameters:
parent - a node in the tree, obtained from this data source
Returns:
the child of parent at index index

getChildCount

public int getChildCount(Object parent)
Returns the number of children of parent . Returns 0 if the node is a leaf or if it has no children. parent must be a node previously obtained from this data source.
Specified by:
getChildCount in interface GraphModel
Parameters:
parent - a node in the tree, obtained from this data source
Returns:
the number of children of the node parent

getConnectionSet

public ConnectionSet getConnectionSet()
A shortcut method to create a connection set that represents the connections in this model. Useful for encoding to avoid writing redundant connection data stored in the cells.

getDescendants

public static List getDescendants(GraphModel model,
                                  Object[] cells)
Flattens the given array of root cells by adding the roots and their descandants. The resulting set contains all cells, which means it contains branches and leafs. Note: This is an iterative implementation. No recursion used.
Note: This returns a linked list, for frequent read operations you should turn this into an array, or at least an array list.

getEdges

public static Object[] getEdges(GraphModel model,
                                Object cell,
                                boolean incoming)
Returns the incoming or outgoing edges for cell. Cell should be a port or a vertex.

getEdges

public static Set getEdges(GraphModel model,
                           Object[] cells)
Returns the set of all connected edges to cells or their descendants. The passed-in cells are never returned as part of the result set. This can be used on vertices, edges and ports.

getEdgesBetween

public static Object[] getEdgesBetween(GraphModel model,
                                       Object cell1,
                                       Object cell2,
                                       boolean directed)
Returns the edges between two specified ports or two specified vertices. If directed is true then cell1 must be the source of the returned edges. This method never returns null. If there are no edges between the specified cells, then an array of length 0 is returned.

getGraphModelListeners

public GraphModelListener[] getGraphModelListeners()
Return an array of all GraphModelListeners that were added to this model.

getIncomingEdges

public static Object[] getIncomingEdges(GraphModel model,
                                        Object cell)
Returns the incoming edges for cell. Cell should be a port or a vertex.

getIndexOfChild

public int getIndexOfChild(Object parent,
                           Object child)
Returns the index of child in parent. If either the parent or child is null, returns -1.
Specified by:
getIndexOfChild in interface GraphModel
Parameters:
parent - a note in the tree, obtained from this data source
child - the node we are interested in
Returns:
the index of the child in the parent, or -1 if either the parent or the child is null

getIndexOfRoot

public int getIndexOfRoot(Object root)
Returns the index of root in the model. If root is null, returns -1.
Specified by:
getIndexOfRoot in interface GraphModel
Parameters:
root - a root in the model, obtained from this data source
Returns:
the index of the root in the model, or -1 if the parent is null

getOpposite

public static Object getOpposite(GraphModel model,
                                 Object edge,
                                 Object cell)
Returns:
Returns the opposite port or vertex in edge.

getOutgoingEdges

public static Object[] getOutgoingEdges(GraphModel model,
                                        Object cell)
Returns the outgoing edges for cell. Cell should be a port or a vertex.

getParent

public Object getParent(Object child)
Returns the parent of child in the model. child must be a node previously obtained from this data source. This returns null if child is a root in the model.
Specified by:
getParent in interface GraphModel
Parameters:
child - a node in the graph, obtained from this data source
Returns:
the parent of child

getRootAt

public Object getRootAt(int index)
Returns the root at index index in the model. This should not return null if index is a valid index for the model (that is index >= 0 && index <32getRootCount()).
Specified by:
getRootAt in interface GraphModel
Returns:
the root of at index index

getRootCount

public int getRootCount()
Returns the number of roots in the model. Returns 0 if the model is empty.
Specified by:
getRootCount in interface GraphModel
Returns:
the number of roots in the model

getRoots

public List getRoots()

getRoots

public static Object[] getRoots(GraphModel model)
Returns the roots of the specified model as an array. This implementation uses the GraphModel interface in the general case, but if the model is a DefaultGraphModel the performance can be improved to linear time.

getRoots

public static Object[] getRoots(GraphModel model,
                                Object[] cells)
Returns the roots in cells by checking if their parent is null. This implementation only uses the GraphModel interface. This method never returns null.

getRootsAsCollection

public static Collection getRootsAsCollection(GraphModel model)
Returns the roots of the specified model as a collection. This implementation uses the GraphModel interface in the general case, but if the model is a DefaultGraphModel the performance can be improved to linear time.

getSource

public Object getSource(Object edge)
Returns the source of edge. edge must be an object previously obtained from this data source.
Specified by:
getSource in interface GraphModel
Returns:
Object that represents the source of edge

getSourceVertex

public static Object getSourceVertex(GraphModel model,
                                     Object edge)
Returns the source vertex of the edge by calling getParent on getSource on the specified model.

getTarget

public Object getTarget(Object edge)
Returns the target of edge. edge must be an object previously obtained from this data source.
Specified by:
getTarget in interface GraphModel
Returns:
Object that represents the target of edge

getTargetVertex

public static Object getTargetVertex(GraphModel model,
                                     Object edge)
Returns the target vertex of the edge by calling getParent on getTarget on the specified model.

getTopmostCells

public static Object[] getTopmostCells(GraphModel model,
                                       Object[] cells)
Returns:
Returns the roots of cells, eg. an array that contains no cell having an ancestor in cells.

getUpdateLevel

public int getUpdateLevel()

getUserObject

public static Object getUserObject(Object cell)

Deprecated. Use GraphModel.getValue(Object) instead.

Returns:
Returns the user object of the given cell. This implementation checks if the cell is a default mutable tree node and returns it's user object.

getValue

public Object getValue(Object cell)
Specified by:
getValue in interface GraphModel
Returns:
Returns the user object of the given cell. This implementation checks if the cell is a default mutable tree node and returns it's user object.

handleAttributes

protected Map handleAttributes(Map attributes)
Applies attributes to the cells specified as keys. Returns the attributes to undo the change.

handleConnection

protected void handleConnection(ConnectionSet.Connection c,
                                boolean establish)
Inserts the specified connection into the model.

handleConnectionSet

protected ConnectionSet handleConnectionSet(ConnectionSet cs)
Applies connectionSet to the model. Returns a connection set that may be used to undo this change.

handleInsert

protected Object[] handleInsert(Object[] cells)
Inserts cells into the model. Returns the cells that were inserted (including descendants).

handleParentMap

protected ParentMap handleParentMap(ParentMap parentMap)
Applies cells to the model. Returns a parent map that may be used to undo this change.

handleRemove

protected Object[] handleRemove(Object[] cells)
Removes cells from the model. Returns the cells that were removed as roots.

hasAncestorIn

public static boolean hasAncestorIn(GraphModel model,
                                    Set parents,
                                    Object child)
Returns true if the specified child has an ancestor in parents.

insert

public void insert(Object[] roots,
                   Map attributes,
                   ConnectionSet cs,
                   ParentMap pm,
                   UndoableEdit[] edits)
Inserts the roots and connections into the model. Notifies the model- and undo listeners of the change. The passed-in edits are executed if they implement the GraphModelEvent.ExecutableGraphChange interface in ascending array-order, after execution of the model change. Note: The passed-in propertyMap may contain PortView s which must be turned into Point s when stored in the model.
Specified by:
insert in interface GraphModel

isEdge

public boolean isEdge(Object edge)
Returns true if edge is a valid edge.
Specified by:
isEdge in interface GraphModel
Returns:
true if edge is a valid edge.

isGroup

public static boolean isGroup(GraphModel model,
                              Object cell)
Checks whether the cell has at least one child which is not a port. This implementation operates on the model, not taking into account visibility of cells. It returns true for groups regardless of their folded state.
Parameters:
cell - the cell to check for being a group
Returns:
Returns true if the cell contains at least one cell which is not a port

isLeaf

public boolean isLeaf(Object node)
Returns whether the specified node is a leaf node. The way the test is performed depends on the.
Specified by:
isLeaf in interface GraphModel
Parameters:
node - the node to check
Returns:
true if the node is a leaf node

isPort

public boolean isPort(Object port)
Returns true if port is a valid port, possibly supporting edge connection.
Specified by:
isPort in interface GraphModel
Returns:
true if port is a valid port.

isRemoveEmptyGroups

public boolean isRemoveEmptyGroups()
Returns:
the removeEmptyGroups

isVertex

public static boolean isVertex(GraphModel model,
                               Object vertex)
Returns true if vertex is a valid vertex.
Returns:
true if vertex is a valid vertex.

order

public static Object[] order(GraphModel model,
                             Object[] cells)
Orders cells so that they reflect the model order.

remove

public void remove(Object[] roots)
Removes cells from the model. Notifies the model- and undo listeners of the change.
Specified by:
remove in interface GraphModel

removeGraphModelListener

public void removeGraphModelListener(GraphModelListener l)
Removes a listener previously added with addGraphModelListener() .
Specified by:
removeGraphModelListener in interface GraphModel
Parameters:
l - the listener to remove

setParent

protected void setParent(Object child,
                         Object parent)
Sets the parent of the specified cell.

setRemoveEmptyGroups

public void setRemoveEmptyGroups(boolean removeEmptyGroups)
Parameters:
removeEmptyGroups - the removeEmptyGroups to set

setSourcePort

public static void setSourcePort(GraphModel model,
                                 Object edge,
                                 Object port)
Helper methods that connects the source of edge to port in model.

setTargetPort

public static void setTargetPort(GraphModel model,
                                 Object edge,
                                 Object port)
Helper methods that connects the source of edge to port in model.

toBack

public void toBack(Object[] cells)
Sends cells to back.
Specified by:
toBack in interface GraphModel

toFront

public void toFront(Object[] cells)
Brings cells to front.
Specified by:
toFront in interface GraphModel

valueForCellChanged

public Object valueForCellChanged(Object cell,
                                  Object newValue)
Applies the new value to the specified cell. Unfortunately for cloning the user object you must still override the attribute map and provide a custom cloneUserObject method. This is because the cloning of a cell is local to the cell, which in turn has a reference to its attribute map.
Specified by:
valueForCellChanged in interface GraphModel
Parameters:
cell -
newValue -
Returns:
the old value for the cell, if any

Copyright (C) 2001-2006 Gaudenz Alder. All rights reserved.