com.bigdata.blueprints

Class BigdataGraphQuery

java.lang.Object

com.bigdata.blueprints.BigdataGraphQuery

All Implemented Interfaces:

com.tinkerpop.blueprints.GraphQuery, com.tinkerpop.blueprints.Query

public class BigdataGraphQuery
extends Object
implements com.tinkerpop.blueprints.GraphQuery

Translate a low-performance Blueprints GraphQuery into a high-performance SPARQL query.

Author:

mikepersonick

Nested Class Summary

Nested classes/interfaces inherited from interface com.tinkerpop.blueprints.Query

com.tinkerpop.blueprints.Query.Compare

Field Summary

Fields

Modifier and Type	Field and Description
protected org.openrdf.model.URI	EDGE URI used to represent a Edge.
protected static List<Class>	knownPredicates These are the only Predicate implementations we handle currently.
protected org.openrdf.model.URI	LABEL URI used for labeling edges.
protected static org.apache.log4j.Logger	log
protected org.openrdf.model.URI	TYPE URI used for typing elements.
protected org.openrdf.model.URI	VERTEX URI used to represent a Vertex.

Constructor Summary

Constructors

Constructor and Description
BigdataGraphQuery(BigdataGraph graph)

Method Summary

Methods

Modifier and Type	Method and Description
Iterable<com.tinkerpop.blueprints.Edge>	edges() Execute the query and return the matching edges.
com.tinkerpop.blueprints.GraphQuery	has(String key) Filter out elements that do not have a property with provided key.
com.tinkerpop.blueprints.GraphQuery	has(String key, Object value) Filter out elements that do not have a property value equal to provided value.
com.tinkerpop.blueprints.GraphQuery	has(String key, com.tinkerpop.blueprints.Predicate predicate, Object value) Filter out the element if it does not have a property with a comparable value.
<T extends Comparable<T>> com.tinkerpop.blueprints.GraphQuery	has(String key, T value, com.tinkerpop.blueprints.Query.Compare compare) Deprecated.
com.tinkerpop.blueprints.GraphQuery	hasNot(String key) Filter out elements that have a property with provided key.
com.tinkerpop.blueprints.GraphQuery	hasNot(String key, Object value) Filter out elements that have a property value equal to provided value.
<T extends Comparable<?>> com.tinkerpop.blueprints.GraphQuery	interval(String key, T startValue, T endValue) Filter out the element of its property value is not within the provided interval.
com.tinkerpop.blueprints.GraphQuery	limit(int limit) Filter out the element if the take number of incident/adjacent elements to retrieve has already been reached.
protected String	toQueryStr(org.openrdf.model.URI type) Generate the SPARQL query.
Iterable<com.tinkerpop.blueprints.Vertex>	vertices() Execute the query and return the vertices on the other end of the matching edges.

Methods inherited from class java.lang.Object

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

Field Detail

log

protected static final transient org.apache.log4j.Logger log

knownPredicates

protected static List<Class> knownPredicates

These are the only Predicate implementations we handle currently.

TYPE

protected final org.openrdf.model.URI TYPE

URI used for typing elements.

VERTEX

protected final org.openrdf.model.URI VERTEX

URI used to represent a Vertex.

EDGE

protected final org.openrdf.model.URI EDGE

URI used to represent a Edge.

LABEL

protected final org.openrdf.model.URI LABEL

URI used for labeling edges.

Constructor Detail

BigdataGraphQuery

public BigdataGraphQuery(BigdataGraph graph)

Method Detail

has

public com.tinkerpop.blueprints.GraphQuery has(String key)

Filter out elements that do not have a property with provided key. ?s ?value

Specified by:

has in interface com.tinkerpop.blueprints.GraphQuery

Specified by:

has in interface com.tinkerpop.blueprints.Query

Parameters:

key - the key of the property

Returns:

the modified query object

hasNot

public com.tinkerpop.blueprints.GraphQuery hasNot(String key)

Filter out elements that have a property with provided key. ?s ?p ?o . filter not exists { ?s ?value } .

Specified by:

hasNot in interface com.tinkerpop.blueprints.GraphQuery

Specified by:

hasNot in interface com.tinkerpop.blueprints.Query

Parameters:

key - the key of the property

Returns:

the modified query object

has

public com.tinkerpop.blueprints.GraphQuery has(String key,
                                      Object value)

Filter out elements that do not have a property value equal to provided value. ?s .

Specified by:

has in interface com.tinkerpop.blueprints.GraphQuery

Specified by:

has in interface com.tinkerpop.blueprints.Query

Parameters:

key - the key of the property

value - the value to check against

Returns:

the modified query object

hasNot

public com.tinkerpop.blueprints.GraphQuery hasNot(String key,
                                         Object value)

Filter out elements that have a property value equal to provided value. ?s ?p ?o . filter not exists { ?s } .

Specified by:

hasNot in interface com.tinkerpop.blueprints.GraphQuery

Specified by:

hasNot in interface com.tinkerpop.blueprints.Query

Parameters:

key - the key of the property

value - the value to check against

Returns:

the modified query object

has

public com.tinkerpop.blueprints.GraphQuery has(String key,
                                      com.tinkerpop.blueprints.Predicate predicate,
                                      Object value)

Filter out the element if it does not have a property with a comparable value.

Specified by:

has in interface com.tinkerpop.blueprints.GraphQuery

Specified by:

has in interface com.tinkerpop.blueprints.Query

Parameters:

key - the key of the property

predicate - the comparator to use for comparison

value - the value to check against

Returns:

the modified query object

has

@Deprecated
public <T extends Comparable<T>> com.tinkerpop.blueprints.GraphQuery has(String key,
                                                                           T value,
                                                                           com.tinkerpop.blueprints.Query.Compare compare)

Deprecated.

Filter out the element if it does not have a property with a comparable value.

Specified by:

has in interface com.tinkerpop.blueprints.GraphQuery

Specified by:

has in interface com.tinkerpop.blueprints.Query

Parameters:

key - the key of the property

value - the value to check against

compare - the comparator to use for comparison

Returns:

the modified query object

interval

public <T extends Comparable<?>> com.tinkerpop.blueprints.GraphQuery interval(String key,
                                                                     T startValue,
                                                                     T endValue)

Filter out the element of its property value is not within the provided interval.

Specified by:

interval in interface com.tinkerpop.blueprints.GraphQuery

Specified by:

interval in interface com.tinkerpop.blueprints.Query

Parameters:

key - the key of the property

startValue - the inclusive start value of the interval

endValue - the exclusive end value of the interval

Returns:

the modified query object

limit

public com.tinkerpop.blueprints.GraphQuery limit(int limit)

Filter out the element if the take number of incident/adjacent elements to retrieve has already been reached.

Specified by:

limit in interface com.tinkerpop.blueprints.GraphQuery

Specified by:

limit in interface com.tinkerpop.blueprints.Query

Parameters:

limit - the take number of elements to return

Returns:

the modified query object

edges

public Iterable<com.tinkerpop.blueprints.Edge> edges()

Execute the query and return the matching edges.

Specified by:

edges in interface com.tinkerpop.blueprints.Query

Returns:

the unfiltered incident edges

vertices

public Iterable<com.tinkerpop.blueprints.Vertex> vertices()

Execute the query and return the vertices on the other end of the matching edges.

Specified by:

vertices in interface com.tinkerpop.blueprints.Query

Returns:

the unfiltered adjacent vertices

toQueryStr

protected String toQueryStr(org.openrdf.model.URI type)

Generate the SPARQL query.