#pragma section-numbers on
<<TableOfContents>>

This guide is intended to provide code examples for using CytoscapeData to access all of your information.  Any questions should be directed to 
cytoscape-discuss@googlegroups.com

=== Acessing Cytoscape Data ===

All attributes in Cytoscape are shared acrosss all CyNetworks.  So there is only one global CytoscapeData instance for nodes and edges.  These are available from the {{{cytoscape.Cytoscape}}} class.

{{{#!java
import cytoscape.Cytoscape;
import cytoscape.data.CytoscapeData;

public class MyDataClass {

  MyDataClass () {

    // get the node CytoscapeData Instance
    CytoscapeData node_data = Cytoscape.getNodeNetworkData();

    // get the edge CytoscapeData Instance
    CytoscapeData edge_data = Cytoscape.getEdgeNetworkData();
}
}}}

(We will assume that these import statements are being used for all subsequent examples.)

As discussed on the CytoscapeData description page, there are 3 ways of adding data. All are compatible, but based on how your data is structured, one might present itself as being more suitable.

=== Single Value Access ===

If you only have a single value for an attribute, i.e. the name of a node, the single access methods will work fine.

{{{#!java
// add a value to a node

GraphObject object; // this can be a Node or Edge.
String attribute_name = "test_attribute"; // an attribute name
Object value = new Double( 5 ); // a Double of value "5"

// get the node CytoscapeData Instance
CytoscapeData data = Cytoscape.getNodeNetworkData();

// add the value
data.setAttributeValue( object.getIdentifier(), attribute_name, value );
}}}