y.io.graphml.output
Class GraphMLWriter

java.lang.Object
  y.io.graphml.output.GraphMLWriter

public class GraphMLWriter
extends Object

Writer class for GraphML.

This class allows for low-level customization of the writing process. Usually, it is used by one of GraphMLHandler's write methods which calls one the various write method overloads. It should rarely be necessary to use this class directly.

See Also:

GraphMLHandler

Constructor Summary

GraphMLWriter()

Method Summary

void	addOutputHandlerProvider(OutputHandlerProvider provider) Register an event listener that can be used to handle QueryOutputHandlersEvents.
void	addSerializationHandler(SerializationHandler listener) Register an event listener that can be used to handle SerializationEvents.
protected void	configureDefaultOutputHandlers() Register default event handlers for the QueryOutputHandlersEvent event.
protected void	configureDefaultSerializationHandlers() Register default event handlers for the fireSerializationEvent(y.io.graphml.output.SerializationEvent) event.
protected GraphMLWriteContext	createWriteContext(Graph graph, XmlWriter writer) Create the initial GraphMLWriteContext instance.
protected void	fireQueryOutputHandlersEvent(QueryOutputHandlersEvent event) Notifies all registered OutputHandlerProvider instances of event.
protected void	fireSerializationEvent(SerializationEvent event) Notifies all registered SerializationHandler instances of event.
protected Map	getOutputHandlers(GraphMLWriteContext context) Dynamically retrieve all OutputHandler that should be used for the current write process.
Object	getSerializationProperty(Object key) Retrieve a serialization property that has been set by setSerializationProperty(Object,Object).
WriteEventHandler	getWriteEventHandler() Return a WriteEventHandler that can be used to subscribe to various events in the write process.
protected Object	lookup(Class type) Dynamically retrieve an instance of type.
void	removeLookup(Class t) Remove an implementation oft that has been set with setLookup(Class,Object).
void	removeOutputHandlerProvider(OutputHandlerProvider provider) Unregister an event listener that has been registered with addOutputHandlerProvider(OutputHandlerProvider).
void	removeSerializationHandler(SerializationHandler listener) Unregister an event listener that has been registered with addSerializationHandler(y.io.graphml.output.SerializationHandler).
void	removeSerializationProperty(Object key) Remove a serialization property that has been set by setSerializationProperty(Object,Object).
protected void	serialize(GraphMLWriteContext context, Object item, Class serializationType) Serialize item to XML content.
void	setLookup(Class t, Object instance) Register an initial implementation of t for use with Lookup.
void	setSerializationProperty(Object key, Object value) Set an initial serialization property that allows to fine tune the write process.
void	write(Graph graph, XmlWriter writer) Write the GraphML representation of graph, Typically, this method is called indirectly from GraphMLHandler.write(Graph,java.io.OutputStream) and it's overloads.

Methods inherited from class java.lang.Object

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

Constructor Detail

GraphMLWriter

public GraphMLWriter()

Method Detail

addOutputHandlerProvider

public void addOutputHandlerProvider(OutputHandlerProvider provider)

Register an event listener that can be used to handle QueryOutputHandlersEvents.

Registering a listener allows to use OutputHandlers dynamically, depending on the actual graph data. For each write, a QueryOutputHandlersEvent is fired and propagated to all registered event listeners.

Usually, this method should not be used directly, register event listeners with GraphMLHandler.addOutputHandlerProvider(OutputHandlerProvider) on an GraphMLHandler instance instead.

Parameters:

provider - Event listener for the QueryInputHandlersEvent

See Also:

fireQueryOutputHandlersEvent(QueryOutputHandlersEvent), removeOutputHandlerProvider(OutputHandlerProvider), GraphMLHandler.addOutputHandlerProvider(OutputHandlerProvider)

removeOutputHandlerProvider

public void removeOutputHandlerProvider(OutputHandlerProvider provider)

Unregister an event listener that has been registered with addOutputHandlerProvider(OutputHandlerProvider).

Parameters:

provider - Event listener for the QueryOutputHandlersEvent

See Also:

fireQueryOutputHandlersEvent(QueryOutputHandlersEvent), addOutputHandlerProvider(OutputHandlerProvider), GraphMLHandler.removeOutputHandlerProvider(OutputHandlerProvider)

fireQueryOutputHandlersEvent

protected void fireQueryOutputHandlersEvent(QueryOutputHandlersEvent event)
                                     throws GraphMLWriteException

Notifies all registered OutputHandlerProvider instances of event.

For each write, a QueryOutputHandlersEvent is fired and propagated to all registered event listeners.

Throws:

GraphMLWriteException

Parameters:

event - The event that has been raised.

See Also:

OutputHandler, OutputHandlerProvider, addOutputHandlerProvider(OutputHandlerProvider), GraphMLHandler.fireQueryOutputHandlersEvent(QueryOutputHandlersEvent)

addSerializationHandler

public void addSerializationHandler(SerializationHandler listener)

Register an event listener that can be used to handle SerializationEvents.

Registering a listener allows to use custom serialization code.

Usually, this method should not be used directly, register event listeners with GraphMLHandler.addSerializationHandler(SerializationHandler) on an GraphMLHandler instance instead.

Parameters:

listener - Event listener for the SerializationEvent

See Also:

fireSerializationEvent(SerializationEvent), removeSerializationHandler(y.io.graphml.output.SerializationHandler), GraphMLHandler.addSerializationHandler(y.io.graphml.output.SerializationHandler)

removeSerializationHandler

public void removeSerializationHandler(SerializationHandler listener)

Unregister an event listener that has been registered with addSerializationHandler(y.io.graphml.output.SerializationHandler).

Parameters:

listener - Event listener for the SerializationEvent

See Also:

fireSerializationEvent(SerializationEvent), addSerializationHandler(y.io.graphml.output.SerializationHandler), GraphMLHandler.removeSerializationHandler(y.io.graphml.output.SerializationHandler)

fireSerializationEvent

protected void fireSerializationEvent(SerializationEvent event)
                               throws GraphMLWriteException

Notifies all registered SerializationHandler instances of event.

Usually, this method is called indirectly through calls to GraphMLWriteContext.serialize(Object) to write the XML representation of an object.

Throws:

GraphMLWriteException

Parameters:

event - The event that has been raised.

See Also:

SerializationHandler, addSerializationHandler(y.io.graphml.output.SerializationHandler), GraphMLWriteContext.serialize(Object), GraphMLHandler.fireSerializationEvent(y.io.graphml.output.SerializationEvent)

configureDefaultSerializationHandlers

protected void configureDefaultSerializationHandlers()

Register default event handlers for the fireSerializationEvent(y.io.graphml.output.SerializationEvent) event.

This implementation does not register any default event handlers

See Also:

GraphMLHandler.configureSerializationHandlers(y.base.Graph,y.io.graphml.output.GraphMLWriter)

configureDefaultOutputHandlers

protected void configureDefaultOutputHandlers()

Register default event handlers for the QueryOutputHandlersEvent event.

This implementation does not register any default event handlers

See Also:

GraphMLHandler.configureOutputHandlers(y.base.Graph,GraphMLWriter)

getOutputHandlers

protected Map getOutputHandlers(GraphMLWriteContext context)
                         throws GraphMLWriteException

Dynamically retrieve all OutputHandler that should be used for the current write process.

Typically, this method is called only indirectly by the write process. This implementation calls fireQueryOutputHandlersEvent(QueryOutputHandlersEvent), which in turn raises the QueryOutputHandlersEvent event.

Throws:

GraphMLWriteException

Parameters:

context - The current write context.

Returns:

A dictionary with KeyScopes as keys and a list of OutputHandler for each scope as values.

serialize

protected void serialize(GraphMLWriteContext context,
                         Object item,
                         Class serializationType)
                  throws GraphMLWriteException

Serialize item to XML content.

Typically, this method is called only indirectly by calls to one of GraphMLWriteContext's serialize . * methods. This implementation calls fireSerializationEvent(y.io.graphml.output.SerializationEvent).

Throws:

GraphMLWriteException

Parameters:

context - The current write context.

item - The object should be serialized.

See Also:

GraphMLWriteContext.serialize(Object), GraphMLWriteContext.serialize(GraphMLWriteContext, Object, Class)

setSerializationProperty

public void setSerializationProperty(Object key,
                                     Object value)

Set an initial serialization property that allows to fine tune the write process.

To dynamically set or change property values during the write process, create a new ChildWriteContext and set the property with the corresponding property handling methods.

Parameters:

key - The key for the property.

value - The property value.

See Also:

getSerializationProperty(Object), GraphMLWriteContext.getSerializationProperty(Object)

removeSerializationProperty

public void removeSerializationProperty(Object key)

Remove a serialization property that has been set by setSerializationProperty(Object,Object).

Parameters:

key - The key for the property.

See Also:

GraphMLWriteContext.getSerializationProperty(Object), setSerializationProperty(Object,Object)

getSerializationProperty

public Object getSerializationProperty(Object key)

Retrieve a serialization property that has been set by setSerializationProperty(Object,Object).

Parameters:

key - The key for the property.

See Also:

GraphMLWriteContext.getSerializationProperty(Object), setSerializationProperty(Object,Object)

setLookup

public void setLookup(Class t,
                      Object instance)

Register an initial implementation of t for use with Lookup.

To dynamically modify lookup behaviour during the write process, create a new ChildWriteContext and use the corresponding lookup handling methods.

Parameters:

t - The type for which an implementation should be registered

instance - The implementation of t for lookup retrieval.

See Also:

lookup, Lookup.lookup(Class)

removeLookup

public void removeLookup(Class t)

Remove an implementation oft that has been set with setLookup(Class,Object).

To dynamically modify lookup behaviour during the parse process, create a new ChildWriteContext and use the corresponding lookup handling methods.

Parameters:

t - The type for which an implementation should be removed

See Also:

setLookup(Class,Object), lookup, Lookup.lookup(Class)

lookup

protected Object lookup(Class type)

Dynamically retrieve an instance of type.

Parameters:

type - The type for which an implementation is needed.

Returns:

An implementation of type, or null.

See Also:

Lookup.lookup(Class), setLookup(Class,Object)

createWriteContext

protected GraphMLWriteContext createWriteContext(Graph graph,
                                                 XmlWriter writer)

Create the initial GraphMLWriteContext instance.

Parameters:

graph - The graph that is written.

writer - The core XmlWriter instance that does the actual writing of XML content.

Returns:

An GraphMLWriteContext instance that is suitable for graph.

write

public void write(Graph graph,
                  XmlWriter writer)
           throws GraphMLWriteException

Write the GraphML representation of graph,

Typically, this method is called indirectly from GraphMLHandler.write(Graph,java.io.OutputStream) and it's overloads.

Throws:

GraphMLWriteException

Parameters:

graph - The graph instance that is populated.

writer - The writer that actually writes the XML content.

See Also:

GraphMLHandler.write(Graph,java.io.OutputStream), GraphMLHandler.write(Graph,java.io.OutputStream,String), GraphMLHandler.write(Graph,java.io.Writer)

getWriteEventHandler

public WriteEventHandler getWriteEventHandler()

Return a WriteEventHandler that can be used to subscribe to various events in the write process.

Returns:

A WriteEventHandler implementation.