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+/**
+ * $Id: mxCell.js,v 1.36 2011-06-17 13:45:08 gaudenz Exp $
+ * Copyright (c) 2006-2010, JGraph Ltd
+ */
+/**
+ * Class: mxCell
+ *
+ * Cells are the elements of the graph model. They represent the state
+ * of the groups, vertices and edges in a graph.
+ * 
+ * Custom attributes:
+ * 
+ * For custom attributes we recommend using an XML node as the value of a cell.
+ * The following code can be used to create a cell with an XML node as the
+ * value:
+ * 
+ * (code)
+ * var doc = mxUtils.createXmlDocument();
+ * var node = doc.createElement('MyNode')
+ * node.setAttribute('label', 'MyLabel');
+ * node.setAttribute('attribute1', 'value1');
+ * graph.insertVertex(graph.getDefaultParent(), null, node, 40, 40, 80, 30);
+ * (end)
+ * 
+ * For the label to work, <mxGraph.convertValueToString> and
+ * <mxGraph.cellLabelChanged> should be overridden as follows:
+ * 
+ * (code)
+ * graph.convertValueToString = function(cell)
+ * {
+ *   if (mxUtils.isNode(cell.value))
+ *   {
+ *     return cell.getAttribute('label', '')
+ *   }
+ * };
+ * 
+ * var cellLabelChanged = graph.cellLabelChanged;
+ * graph.cellLabelChanged = function(cell, newValue, autoSize)
+ * {
+ *   if (mxUtils.isNode(cell.value))
+ *   {
+ *     // Clones the value for correct undo/redo
+ *     var elt = cell.value.cloneNode(true);
+ *     elt.setAttribute('label', newValue);
+ *     newValue = elt;
+ *   }
+ *   
+ *   cellLabelChanged.apply(this, arguments);
+ * };
+ * (end)
+ * 
+ * Callback: onInit
+ *
+ * Called from within the constructor.
+ * 
+ * Constructor: mxCell
+ *
+ * Constructs a new cell to be used in a graph model.
+ * This method invokes <onInit> upon completion.
+ * 
+ * Parameters:
+ * 
+ * value - Optional object that represents the cell value.
+ * geometry - Optional <mxGeometry> that specifies the geometry.
+ * style - Optional formatted string that defines the style.
+ */
+function mxCell(value, geometry, style)
+{
+	this.value = value;
+	this.setGeometry(geometry);
+	this.setStyle(style);
+	
+	if (this.onInit != null)
+	{
+		this.onInit();
+	}
+};
+
+/**
+ * Variable: id
+ *
+ * Holds the Id. Default is null.
+ */
+mxCell.prototype.id = null;
+
+/**
+ * Variable: value
+ *
+ * Holds the user object. Default is null.
+ */
+mxCell.prototype.value = null;
+
+/**
+ * Variable: geometry
+ *
+ * Holds the <mxGeometry>. Default is null.
+ */
+mxCell.prototype.geometry = null;
+
+/**
+ * Variable: style
+ *
+ * Holds the style as a string of the form [(stylename|key=value);]. Default is
+ * null.
+ */
+mxCell.prototype.style = null;
+
+/**
+ * Variable: vertex
+ *
+ * Specifies whether the cell is a vertex. Default is false.
+ */
+mxCell.prototype.vertex = false;
+
+/**
+ * Variable: edge
+ *
+ * Specifies whether the cell is an edge. Default is false.
+ */
+mxCell.prototype.edge = false;
+
+/**
+ * Variable: connectable
+ *
+ * Specifies whether the cell is connectable. Default is true.
+ */
+mxCell.prototype.connectable = true;
+
+/**
+ * Variable: visible
+ *
+ * Specifies whether the cell is visible. Default is true.
+ */
+mxCell.prototype.visible = true;
+
+/**
+ * Variable: collapsed
+ *
+ * Specifies whether the cell is collapsed. Default is false.
+ */
+mxCell.prototype.collapsed = false;
+
+/**
+ * Variable: parent
+ *
+ * Reference to the parent cell.
+ */
+mxCell.prototype.parent = null;
+
+/**
+ * Variable: source
+ *
+ * Reference to the source terminal.
+ */
+mxCell.prototype.source = null;
+
+/**
+ * Variable: target
+ *
+ * Reference to the target terminal.
+ */
+mxCell.prototype.target = null;
+
+/**
+ * Variable: children
+ *
+ * Holds the child cells.
+ */
+mxCell.prototype.children = null;
+
+/**
+ * Variable: edges
+ *
+ * Holds the edges.
+ */
+mxCell.prototype.edges = null;
+
+/**
+ * Variable: mxTransient
+ *
+ * List of members that should not be cloned inside <clone>. This field is
+ * passed to <mxUtils.clone> and is not made persistent in <mxCellCodec>.
+ * This is not a convention for all classes, it is only used in this class
+ * to mark transient fields since transient modifiers are not supported by
+ * the language.
+ */
+mxCell.prototype.mxTransient = ['id', 'value', 'parent', 'source',
+                                'target', 'children', 'edges'];
+
+/**
+ * Function: getId
+ *
+ * Returns the Id of the cell as a string.
+ */
+mxCell.prototype.getId = function()
+{
+	return this.id;
+};
+		
+/**
+ * Function: setId
+ *
+ * Sets the Id of the cell to the given string.
+ */
+mxCell.prototype.setId = function(id)
+{
+	this.id = id;
+};
+
+/**
+ * Function: getValue
+ *
+ * Returns the user object of the cell. The user
+ * object is stored in <value>.
+ */
+mxCell.prototype.getValue = function()
+{
+	return this.value;
+};
+		
+/**
+ * Function: setValue
+ *
+ * Sets the user object of the cell. The user object
+ * is stored in <value>.
+ */
+mxCell.prototype.setValue = function(value)
+{
+	this.value = value;
+};
+
+/**
+ * Function: valueChanged
+ *
+ * Changes the user object after an in-place edit
+ * and returns the previous value. This implementation
+ * replaces the user object with the given value and
+ * returns the old user object.
+ */
+mxCell.prototype.valueChanged = function(newValue)
+{
+	var previous = this.getValue();
+	this.setValue(newValue);
+	
+	return previous;
+};
+
+/**
+ * Function: getGeometry
+ *
+ * Returns the <mxGeometry> that describes the <geometry>.
+ */
+mxCell.prototype.getGeometry = function()
+{
+	return this.geometry;
+};
+
+/**
+ * Function: setGeometry
+ *
+ * Sets the <mxGeometry> to be used as the <geometry>.
+ */
+mxCell.prototype.setGeometry = function(geometry)
+{
+	this.geometry = geometry;
+};
+
+/**
+ * Function: getStyle
+ *
+ * Returns a string that describes the <style>.
+ */
+mxCell.prototype.getStyle = function()
+{
+	return this.style;
+};
+
+/**
+ * Function: setStyle
+ *
+ * Sets the string to be used as the <style>.
+ */
+mxCell.prototype.setStyle = function(style)
+{
+	this.style = style;
+};
+
+/**
+ * Function: isVertex
+ *
+ * Returns true if the cell is a vertex.
+ */
+mxCell.prototype.isVertex = function()
+{
+	return this.vertex;
+};
+
+/**
+ * Function: setVertex
+ *
+ * Specifies if the cell is a vertex. This should only be assigned at
+ * construction of the cell and not be changed during its lifecycle.
+ * 
+ * Parameters:
+ * 
+ * vertex - Boolean that specifies if the cell is a vertex.
+ */
+mxCell.prototype.setVertex = function(vertex)
+{
+	this.vertex = vertex;
+};
+
+/**
+ * Function: isEdge
+ *
+ * Returns true if the cell is an edge.
+ */
+mxCell.prototype.isEdge = function()
+{
+	return this.edge;
+};
+	
+/**
+ * Function: setEdge
+ * 
+ * Specifies if the cell is an edge. This should only be assigned at
+ * construction of the cell and not be changed during its lifecycle.
+ * 
+ * Parameters:
+ * 
+ * edge - Boolean that specifies if the cell is an edge.
+ */
+mxCell.prototype.setEdge = function(edge)
+{
+	this.edge = edge;
+};
+
+/**
+ * Function: isConnectable
+ *
+ * Returns true if the cell is connectable.
+ */
+mxCell.prototype.isConnectable = function()
+{
+	return this.connectable;
+};
+
+/**
+ * Function: setConnectable
+ *
+ * Sets the connectable state.
+ * 
+ * Parameters:
+ * 
+ * connectable - Boolean that specifies the new connectable state.
+ */
+mxCell.prototype.setConnectable = function(connectable)
+{
+	this.connectable = connectable;
+};
+
+/**
+ * Function: isVisible
+ *
+ * Returns true if the cell is visibile.
+ */
+mxCell.prototype.isVisible = function()
+{
+	return this.visible;
+};
+
+/**
+ * Function: setVisible
+ *
+ * Specifies if the cell is visible.
+ * 
+ * Parameters:
+ * 
+ * visible - Boolean that specifies the new visible state.
+ */
+mxCell.prototype.setVisible = function(visible)
+{
+	this.visible = visible;
+};
+
+/**
+ * Function: isCollapsed
+ *
+ * Returns true if the cell is collapsed.
+ */
+mxCell.prototype.isCollapsed = function()
+{
+	return this.collapsed;
+};
+
+/**
+ * Function: setCollapsed
+ *
+ * Sets the collapsed state.
+ * 
+ * Parameters:
+ * 
+ * collapsed - Boolean that specifies the new collapsed state.
+ */
+mxCell.prototype.setCollapsed = function(collapsed)
+{
+	this.collapsed = collapsed;
+};
+
+/**
+ * Function: getParent
+ *
+ * Returns the cell's parent.
+ */
+mxCell.prototype.getParent = function()
+{
+	return this.parent;
+};
+
+/**
+ * Function: setParent
+ *
+ * Sets the parent cell.
+ * 
+ * Parameters:
+ * 
+ * parent - <mxCell> that represents the new parent.
+ */
+mxCell.prototype.setParent = function(parent)
+{
+	this.parent = parent;
+};
+
+/**
+ * Function: getTerminal
+ *
+ * Returns the source or target terminal.
+ * 
+ * Parameters:
+ * 
+ * source - Boolean that specifies if the source terminal should be
+ * returned.
+ */
+mxCell.prototype.getTerminal = function(source)
+{
+	return (source) ? this.source : this.target;
+};
+
+/**
+ * Function: setTerminal
+ *
+ * Sets the source or target terminal and returns the new terminal.
+ * 
+ * Parameters:
+ * 
+ * terminal - <mxCell> that represents the new source or target terminal.
+ * isSource - Boolean that specifies if the source or target terminal
+ * should be set.
+ */
+mxCell.prototype.setTerminal = function(terminal, isSource)
+{
+	if (isSource)
+	{
+		this.source = terminal;
+	}
+	else
+	{
+		this.target = terminal;
+	}
+	
+	return terminal;
+};
+
+/**
+ * Function: getChildCount
+ *
+ * Returns the number of child cells.
+ */
+mxCell.prototype.getChildCount = function()
+{
+	return (this.children == null) ? 0 : this.children.length;
+};
+
+/**
+ * Function: getIndex
+ *
+ * Returns the index of the specified child in the child array.
+ * 
+ * Parameters:
+ * 
+ * child - Child whose index should be returned.
+ */
+mxCell.prototype.getIndex = function(child)
+{
+	return mxUtils.indexOf(this.children, child);
+};
+
+/**
+ * Function: getChildAt
+ *
+ * Returns the child at the specified index.
+ * 
+ * Parameters:
+ * 
+ * index - Integer that specifies the child to be returned.
+ */
+mxCell.prototype.getChildAt = function(index)
+{
+	return (this.children == null) ? null : this.children[index];
+};
+
+/**
+ * Function: insert
+ *
+ * Inserts the specified child into the child array at the specified index
+ * and updates the parent reference of the child. If not childIndex is
+ * specified then the child is appended to the child array. Returns the
+ * inserted child.
+ * 
+ * Parameters:
+ * 
+ * child - <mxCell> to be inserted or appended to the child array.
+ * index - Optional integer that specifies the index at which the child
+ * should be inserted into the child array.
+ */
+mxCell.prototype.insert = function(child, index)
+{
+	if (child != null)
+	{
+		if (index == null)
+		{
+			index = this.getChildCount();
+			
+			if (child.getParent() == this)
+			{
+				index--;
+			}
+		}
+
+		child.removeFromParent();
+		child.setParent(this);
+		
+		if (this.children == null)
+		{
+			this.children = [];
+			this.children.push(child);
+		}
+		else
+		{
+			this.children.splice(index, 0, child);
+		}
+	}
+	
+	return child;
+};
+
+/**
+ * Function: remove
+ *
+ * Removes the child at the specified index from the child array and
+ * returns the child that was removed. Will remove the parent reference of
+ * the child.
+ * 
+ * Parameters:
+ * 
+ * index - Integer that specifies the index of the child to be
+ * removed.
+ */
+mxCell.prototype.remove = function(index)
+{
+	var child = null;
+	
+	if (this.children != null && index >= 0)
+	{
+		child = this.getChildAt(index);
+		
+		if (child != null)
+		{
+			this.children.splice(index, 1);
+			child.setParent(null);
+		}
+	}
+	
+	return child;
+};
+
+/**
+ * Function: removeFromParent
+ *
+ * Removes the cell from its parent.
+ */
+mxCell.prototype.removeFromParent = function()
+{
+	if (this.parent != null)
+	{
+		var index = this.parent.getIndex(this);
+		this.parent.remove(index);
+	}
+};
+
+/**
+ * Function: getEdgeCount
+ *
+ * Returns the number of edges in the edge array.
+ */
+mxCell.prototype.getEdgeCount = function()
+{
+	return (this.edges == null) ? 0 : this.edges.length;
+};
+
+/**
+ * Function: getEdgeIndex
+ *
+ * Returns the index of the specified edge in <edges>.
+ * 
+ * Parameters:
+ * 
+ * edge - <mxCell> whose index in <edges> should be returned.
+ */
+mxCell.prototype.getEdgeIndex = function(edge)
+{
+	return mxUtils.indexOf(this.edges, edge);
+};
+
+/**
+ * Function: getEdgeAt
+ *
+ * Returns the edge at the specified index in <edges>.
+ * 
+ * Parameters:
+ * 
+ * index - Integer that specifies the index of the edge to be returned.
+ */
+mxCell.prototype.getEdgeAt = function(index)
+{
+	return (this.edges == null) ? null : this.edges[index];
+};
+
+/**
+ * Function: insertEdge
+ *
+ * Inserts the specified edge into the edge array and returns the edge.
+ * Will update the respective terminal reference of the edge.
+ * 
+ * Parameters:
+ * 
+ * edge - <mxCell> to be inserted into the edge array.
+ * isOutgoing - Boolean that specifies if the edge is outgoing.
+ */
+mxCell.prototype.insertEdge = function(edge, isOutgoing)
+{
+	if (edge != null)
+	{
+		edge.removeFromTerminal(isOutgoing);
+		edge.setTerminal(this, isOutgoing);
+		
+		if (this.edges == null ||
+			edge.getTerminal(!isOutgoing) != this ||
+			mxUtils.indexOf(this.edges, edge) < 0)
+		{
+			if (this.edges == null)
+			{
+				this.edges = [];
+			}
+			
+			this.edges.push(edge);
+		}
+	}
+	
+	return edge;
+};
+
+/**
+ * Function: removeEdge
+ *
+ * Removes the specified edge from the edge array and returns the edge.
+ * Will remove the respective terminal reference from the edge.
+ * 
+ * Parameters:
+ * 
+ * edge - <mxCell> to be removed from the edge array.
+ * isOutgoing - Boolean that specifies if the edge is outgoing.
+ */
+mxCell.prototype.removeEdge = function(edge, isOutgoing)
+{
+	if (edge != null)
+	{
+		if (edge.getTerminal(!isOutgoing) != this &&
+			this.edges != null)
+		{
+			var index = this.getEdgeIndex(edge);
+			
+			if (index >= 0)
+			{
+				this.edges.splice(index, 1);
+			}
+		}
+		
+		edge.setTerminal(null, isOutgoing);
+	}
+	
+	return edge;
+};
+
+/**
+ * Function: removeFromTerminal
+ *
+ * Removes the edge from its source or target terminal.
+ * 
+ * Parameters:
+ * 
+ * isSource - Boolean that specifies if the edge should be removed from its
+ * source or target terminal.
+ */
+mxCell.prototype.removeFromTerminal = function(isSource)
+{
+	var terminal = this.getTerminal(isSource);
+	
+	if (terminal != null)
+	{
+		terminal.removeEdge(this, isSource);
+	}
+};
+
+/**
+ * Function: getAttribute
+ *
+ * Returns the specified attribute from the user object if it is an XML
+ * node.
+ * 
+ * Parameters:
+ * 
+ * name - Name of the attribute whose value should be returned.
+ * defaultValue - Optional default value to use if the attribute has no
+ * value.
+ */
+mxCell.prototype.getAttribute = function(name, defaultValue)
+{
+	var userObject = this.getValue();
+	
+	var val = (userObject != null &&
+		userObject.nodeType == mxConstants.NODETYPE_ELEMENT) ?
+		userObject.getAttribute(name) : null;
+		
+	return val || defaultValue;
+};
+
+/**
+ * Function: setAttribute
+ *
+ * Sets the specified attribute on the user object if it is an XML node.
+ * 
+ * Parameters:
+ * 
+ * name - Name of the attribute whose value should be set.
+ * value - New value of the attribute.
+ */
+mxCell.prototype.setAttribute = function(name, value)
+{
+	var userObject = this.getValue();
+	
+	if (userObject != null &&
+		userObject.nodeType == mxConstants.NODETYPE_ELEMENT)
+	{
+		userObject.setAttribute(name, value);
+	}
+};
+
+/**
+ * Function: clone
+ *
+ * Returns a clone of the cell. Uses <cloneValue> to clone
+ * the user object. All fields in <mxTransient> are ignored
+ * during the cloning.
+ */
+mxCell.prototype.clone = function()
+{
+	var clone = mxUtils.clone(this, this.mxTransient);
+	clone.setValue(this.cloneValue());
+	
+	return clone;
+};
+
+/**
+ * Function: cloneValue
+ *
+ * Returns a clone of the cell's user object.
+ */
+mxCell.prototype.cloneValue = function()
+{
+	var value = this.getValue();
+	
+	if (value != null)
+	{
+		if (typeof(value.clone) == 'function')
+		{
+			value = value.clone();
+		}
+		else if (!isNaN(value.nodeType))
+		{
+			value = value.cloneNode(true);
+		}
+	}
+	
+	return value;
+};