Package com.gpudb.protocol

Class GetGraphEntitiesRequest

java.lang.Object

com.gpudb.protocol.GetGraphEntitiesRequest

All Implemented Interfaces:

org.apache.avro.generic.GenericContainer, org.apache.avro.generic.IndexedRecord

public class GetGraphEntitiesRequest
extends Object
implements org.apache.avro.generic.IndexedRecord

A set of parameters for GPUdb.getGraphEntities.

Retrieves node or edge entities from an existing graph, with pagination support via offset and limit. Use GPUdb.showGraph to obtain the total number of nodes and edges.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	GetGraphEntitiesRequest.Options	A set of string constants for the GetGraphEntitiesRequest parameter options.

Constructor Summary

Constructors

Constructor	Description
GetGraphEntitiesRequest()	Constructs a GetGraphEntitiesRequest object with default parameters.
GetGraphEntitiesRequest(String graphName, long offset, long limit, Map<String,String> options)	Constructs a GetGraphEntitiesRequest object with the specified parameters.

Method Summary

Modifier and Type	Method	Description
boolean	equals(Object obj)
Object	get(int index)	This method supports the Avro framework and is not intended to be called directly by the user.
static org.apache.avro.Schema	getClassSchema()	This method supports the Avro framework and is not intended to be called directly by the user.
String	getGraphName()	Name of the graph from which to retrieve entities.
long	getLimit()	Number of entities to retrieve starting from offset.
long	getOffset()	Starting index of the entities to retrieve (0-based).
Map<String,String>	getOptions()	Optional parameters.
org.apache.avro.Schema	getSchema()	This method supports the Avro framework and is not intended to be called directly by the user.
int	hashCode()
void	put(int index, Object value)	This method supports the Avro framework and is not intended to be called directly by the user.
GetGraphEntitiesRequest	setGraphName(String graphName)	Name of the graph from which to retrieve entities.
GetGraphEntitiesRequest	setLimit(long limit)	Number of entities to retrieve starting from offset.
GetGraphEntitiesRequest	setOffset(long offset)	Starting index of the entities to retrieve (0-based).
GetGraphEntitiesRequest	setOptions(Map<String,String> options)	Optional parameters.
String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

GetGraphEntitiesRequest

public GetGraphEntitiesRequest()

Constructs a GetGraphEntitiesRequest object with default parameters.

GetGraphEntitiesRequest

public GetGraphEntitiesRequest(String graphName,
                               long offset,
                               long limit,
                               Map<String,String> options)

Constructs a GetGraphEntitiesRequest object with the specified parameters.

Parameters:

graphName - Name of the graph from which to retrieve entities.

offset - Starting index of the entities to retrieve (0-based). The default value is 0.

limit - Number of entities to retrieve starting from offset. A value of -1 returns all entities from the offset to the end. Note: the entitiesInt or entitiesString array size will be 2x this value for nodes (stride 2) or 4x for edges (stride 4). The default value is 10000.

options - Optional parameters.

• ENTITY_TYPE: The type of entity to retrieve. Supported values:
  • EDGE: Retrieve edge entities (default).
  • NODE: Retrieve node entities.
  The default value is EDGE.
• SERVER_ID: Indicates which graph server to send the request to. Required when the graph is distributed across multiple servers. The default value is '0'.

The default value is an empty Map.

Method Detail

getClassSchema

public static org.apache.avro.Schema getClassSchema()

This method supports the Avro framework and is not intended to be called directly by the user.

Returns:

The schema for the class.

getGraphName

public String getGraphName()

Name of the graph from which to retrieve entities.

Returns:

The current value of graphName.

setGraphName

public GetGraphEntitiesRequest setGraphName(String graphName)

Name of the graph from which to retrieve entities.

Parameters:

graphName - The new value for graphName.

Returns:

this to mimic the builder pattern.

getOffset

public long getOffset()

Starting index of the entities to retrieve (0-based). The default value is 0.

Returns:

The current value of offset.

setOffset

public GetGraphEntitiesRequest setOffset(long offset)

Starting index of the entities to retrieve (0-based). The default value is 0.

Parameters:

offset - The new value for offset.

Returns:

this to mimic the builder pattern.

getLimit

public long getLimit()

Number of entities to retrieve starting from offset. A value of -1 returns all entities from the offset to the end. Note: the entitiesInt or entitiesString array size will be 2x this value for nodes (stride 2) or 4x for edges (stride 4). The default value is 10000.

Returns:

The current value of limit.

setLimit

public GetGraphEntitiesRequest setLimit(long limit)

Number of entities to retrieve starting from offset. A value of -1 returns all entities from the offset to the end. Note: the entitiesInt or entitiesString array size will be 2x this value for nodes (stride 2) or 4x for edges (stride 4). The default value is 10000.

Parameters:

limit - The new value for limit.

Returns:

this to mimic the builder pattern.

getOptions

public Map<String,String> getOptions()

Optional parameters.

• ENTITY_TYPE: The type of entity to retrieve. Supported values:
  • EDGE: Retrieve edge entities (default).
  • NODE: Retrieve node entities.
  The default value is EDGE.
• SERVER_ID: Indicates which graph server to send the request to. Required when the graph is distributed across multiple servers. The default value is '0'.

The default value is an empty Map.

Returns:

The current value of options.

setOptions

public GetGraphEntitiesRequest setOptions(Map<String,String> options)

Optional parameters.

• ENTITY_TYPE: The type of entity to retrieve. Supported values:
  • EDGE: Retrieve edge entities (default).
  • NODE: Retrieve node entities.
  The default value is EDGE.
• SERVER_ID: Indicates which graph server to send the request to. Required when the graph is distributed across multiple servers. The default value is '0'.

The default value is an empty Map.

Parameters:

options - The new value for options.

Returns:

this to mimic the builder pattern.

getSchema

public org.apache.avro.Schema getSchema()

This method supports the Avro framework and is not intended to be called directly by the user.

Specified by:

getSchema in interface org.apache.avro.generic.GenericContainer

Returns:

The schema object describing this class.

get

public Object get(int index)

This method supports the Avro framework and is not intended to be called directly by the user.

Specified by:

get in interface org.apache.avro.generic.IndexedRecord

Parameters:

index - the position of the field to get

Returns:

value of the field with the given index.

Throws:

IndexOutOfBoundsException

put

public void put(int index,
                Object value)

This method supports the Avro framework and is not intended to be called directly by the user.

Specified by:

put in interface org.apache.avro.generic.IndexedRecord

Parameters:

index - the position of the field to set

value - the value to set

Throws:

IndexOutOfBoundsException

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

toString

public String toString()

Overrides:

toString in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object