org.janusgraph.example

Class GraphApp

java.lang.Object

org.janusgraph.example.GraphApp

Direct Known Subclasses:

JanusGraphApp

public class GraphApp
extends Object

Field Summary

Fields

Modifier and Type	Field and Description
protected org.apache.commons.configuration2.Configuration	conf
protected org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.GraphTraversalSource	g
protected org.apache.tinkerpop.gremlin.structure.Graph	graph
protected String	propFileName
protected boolean	supportsGeoshape
protected boolean	supportsSchema
protected boolean	supportsTransactions

Constructor Summary

Constructors

Constructor and Description
GraphApp(String fileName) Constructs a graph app using the given properties.

Method Summary

Modifier and Type	Method and Description
void	closeGraph() Closes the graph instance.
void	createElements() Adds the vertices, edges, and properties to the graph.
void	createSchema() Creates the graph schema.
void	deleteElements() Deletes elements from the graph structure.
void	dropGraph() Drops the graph instance.
protected float[]	getGeoFloatArray(float lat, float lon) Returns the geographical coordinates as a float array.
org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.GraphTraversalSource	openGraph() Opens the graph instance.
void	readElements() Runs some traversal queries to get data from the graph.
void	runApp() Run the entire application: 1.
void	updateElements() Makes an update to the existing graph structure.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

propFileName

protected String propFileName

conf

protected org.apache.commons.configuration2.Configuration conf

graph

protected org.apache.tinkerpop.gremlin.structure.Graph graph

g

protected org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.GraphTraversalSource g

supportsTransactions

protected boolean supportsTransactions

supportsSchema

protected boolean supportsSchema

supportsGeoshape

protected boolean supportsGeoshape

Constructor Detail

GraphApp

public GraphApp(String fileName)

Constructs a graph app using the given properties.

Parameters:

fileName - location of the properties file

Method Detail

openGraph

public org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.GraphTraversalSource openGraph()
                                                                                        throws org.apache.commons.configuration2.ex.ConfigurationException,
                                                                                               IOException

Opens the graph instance. If the graph instance does not exist, a new graph instance is initialized.

Throws:

org.apache.commons.configuration2.ex.ConfigurationException

IOException

closeGraph

public void closeGraph()
                throws Exception

Closes the graph instance.

Throws:

Exception

dropGraph

public void dropGraph()
               throws Exception

Drops the graph instance. The default implementation does nothing.

Throws:

Exception

createSchema

public void createSchema()

Creates the graph schema. The default implementation does nothing.

createElements

public void createElements()

Adds the vertices, edges, and properties to the graph.

getGeoFloatArray

protected float[] getGeoFloatArray(float lat,
                                   float lon)

Returns the geographical coordinates as a float array.

readElements

public void readElements()

Runs some traversal queries to get data from the graph.

updateElements

public void updateElements()

Makes an update to the existing graph structure. Does not create any new vertices or edges.

deleteElements

public void deleteElements()

Deletes elements from the graph structure. When a vertex is deleted, its incident edges are also deleted.

runApp

public void runApp()

Run the entire application: 1. Open and initialize the graph 2. Define the schema 3. Build the graph 4. Run traversal queries to get data from the graph 5. Make updates to the graph 6. Close the graph