Package com.complexible.common.rdf

Class DelegatingStatementSource

java.lang.Object

com.complexible.common.rdf.DelegatingStatementSource

All Implemented Interfaces:

StatementSource, java.io.Closeable, java.lang.AutoCloseable

Direct Known Subclasses:

ContextFallbackStatementSource, ContextOverrideStatementSource

public class DelegatingStatementSource
extends java.lang.Object
implements StatementSource

Implementation of a StatementSource which can be used as the base for StatementSource decorator implementations.

Since:

0.8

Version:

4.0

Author:

Michael Grove

Field Summary

Fields inherited from interface com.complexible.common.rdf.StatementSource

NO_ESTIMATE

Constructor Summary

Constructors

Constructor	Description
DelegatingStatementSource(StatementSource theSource)

Method Summary

Modifier and Type	Method	Description
void	close()
boolean	containsVirtual()	Returns true if the statement source represents, at least partially, the contents of a Virtual Graph
long	estimatedCount()	Returns the estimated count of statements in this source or NO_ESTIMATE if the estimate is not known.
Resource	getContext()	Return the context these statements belong to.
StatementSource	getSource()
boolean	inMemory()	Returns true if all statements are held in memory
StatementIterator	statements()	Return an iterator over the statements contained by this source.
java.util.List<RDFStream>	streams()	Converts the statement source into one or more streams.

Methods inherited from class java.lang.Object

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

Constructor Detail

DelegatingStatementSource

public DelegatingStatementSource(StatementSource theSource)

Method Detail

getSource

public StatementSource getSource()

statements

public StatementIterator statements()

Return an iterator over the statements contained by this source.

Specified by:

statements in interface StatementSource

Returns:

an iteration over the statements.

streams

public java.util.List<RDFStream> streams()

Converts the statement source into one or more streams.

Specified by:

streams in interface StatementSource

getContext

public Resource getContext()

Return the context these statements belong to. When non-null, this should override the context specified on the statements themselves.

Specified by:

getContext in interface StatementSource

Returns:

the context of all the statements from this source, or `null` if there is no context (for all of them) or they each have their own context specified.

close

public void close()
           throws java.io.IOException

Specified by:

close in interface java.lang.AutoCloseable

Specified by:

close in interface java.io.Closeable

Throws:

java.io.IOException

containsVirtual

public boolean containsVirtual()

Description copied from interface: StatementSource

Returns true if the statement source represents, at least partially, the contents of a Virtual Graph

Specified by:

containsVirtual in interface StatementSource

estimatedCount

public long estimatedCount()

Description copied from interface: StatementSource

Returns the estimated count of statements in this source or NO_ESTIMATE if the estimate is not known.

Specified by:

estimatedCount in interface StatementSource

inMemory

public boolean inMemory()

Description copied from interface: StatementSource

Returns true if all statements are held in memory

Specified by:

inMemory in interface StatementSource

Returns:

true if all statements are held in memory