org.openrdf.sail.helpers
Class SailConnectionBase

java.lang.Object
  org.openrdf.sail.helpers.SailConnectionBase

All Implemented Interfaces:

SailConnection

Direct Known Subclasses:

NotifyingSailConnectionBase, RdbmsConnection

public abstract class SailConnectionBase
extends java.lang.Object
implements SailConnection

Abstract Class offering base functionality for SailConnection implementations.

Author:

Arjohn Kampman, jeen

Field Summary

protected java.util.concurrent.locks.ReentrantReadWriteLock	connectionLock Lock used to give the close() method exclusive access to a connection.
protected Logger	logger
protected java.util.concurrent.locks.ReentrantLock	updateLock Lock used to prevent concurrent calls to update methods like addStatement, clear, commit, etc.

Constructor Summary

SailConnectionBase(SailBase sailBase)

Method Summary

void	addStatement(Resource subj, URI pred, Value obj, Resource... contexts) Adds a statement to the store.
protected abstract void	addStatementInternal(Resource subj, URI pred, Value obj, Resource... contexts)
protected void	autoStartTransaction()
void	clear(Resource... contexts) Removes all statements from the specified/all contexts.
protected abstract void	clearInternal(Resource... contexts)
void	clearNamespaces() Removes all namespace declarations from the repository.
protected abstract void	clearNamespacesInternal()
void	close() Closes the connection.
protected abstract void	closeInternal()
void	commit() Commits any updates that have been performed since the last time SailConnection.commit() or SailConnection.rollback() was called.
protected abstract void	commitInternal()
CloseableIteration<? extends BindingSet,QueryEvaluationException>	evaluate(TupleExpr tupleExpr, Dataset dataset, BindingSet bindings, boolean includeInferred) Evaluates the supplied TupleExpr on the data contained in this Sail object, using the (optional) dataset and supplied bindings as input parameters.
protected abstract CloseableIteration<? extends BindingSet,QueryEvaluationException>	evaluateInternal(TupleExpr tupleExpr, Dataset dataset, BindingSet bindings, boolean includeInferred)
protected void	finalize()
CloseableIteration<? extends Resource,SailException>	getContextIDs() Returns the set of all unique context identifiers that are used to store statements.
protected abstract CloseableIteration<? extends Resource,SailException>	getContextIDsInternal()
protected Lock	getExclusiveConnectionLock() Deprecated. Use connectionLock directly instead.
java.lang.String	getNamespace(java.lang.String prefix) Gets the namespace that is mapped to the specified prefix.
protected abstract java.lang.String	getNamespaceInternal(java.lang.String prefix)
CloseableIteration<? extends Namespace,SailException>	getNamespaces() Gets the namespaces relevant to the data contained in this Sail object.
protected abstract CloseableIteration<? extends Namespace,SailException>	getNamespacesInternal()
protected Lock	getSharedConnectionLock() Deprecated. Use connectionLock directly instead.
CloseableIteration<? extends Statement,SailException>	getStatements(Resource subj, URI pred, Value obj, boolean includeInferred, Resource... contexts) Gets all statements from the specified contexts that have a specific subject, predicate and/or object.
protected abstract CloseableIteration<? extends Statement,SailException>	getStatementsInternal(Resource subj, URI pred, Value obj, boolean includeInferred, Resource... contexts)
protected Lock	getTransactionLock() Deprecated. Use updateLock directly instead.
boolean	isOpen() Checks whether this SailConnection is open.
protected void	iterationClosed(org.openrdf.sail.helpers.SailBaseIteration iter) Called by SailBaseIteration to indicate that it has been closed.
protected <T,E extends java.lang.Exception> CloseableIteration<T,E>	registerIteration(CloseableIteration<T,E> iter) Registers an iteration as active by wrapping it in a SailBaseIteration object and adding it to the list of active iterations.
void	removeNamespace(java.lang.String prefix) Removes a namespace declaration by removing the association between a prefix and a namespace name.
protected abstract void	removeNamespaceInternal(java.lang.String prefix)
void	removeStatements(Resource subj, URI pred, Value obj, Resource... contexts) Removes all statements matching the specified subject, predicate and object from the repository.
protected abstract void	removeStatementsInternal(Resource subj, URI pred, Value obj, Resource... contexts)
void	rollback() Rolls back the SailConnection, discarding any uncommitted changes that have been made in this SailConnection.
protected abstract void	rollbackInternal()
void	setNamespace(java.lang.String prefix, java.lang.String name) Sets the prefix of a namespace.
protected abstract void	setNamespaceInternal(java.lang.String prefix, java.lang.String name)
long	size(Resource... contexts) Returns the number of (explicit) statements in the store, or in specific contexts.
protected abstract long	sizeInternal(Resource... contexts)
protected abstract void	startTransactionInternal()
protected boolean	transactionActive()
protected void	verifyIsOpen()

Methods inherited from class java.lang.Object

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

Field Detail

logger

protected final Logger logger

connectionLock

protected final java.util.concurrent.locks.ReentrantReadWriteLock connectionLock

Lock used to give the close() method exclusive access to a connection.

• write lock: close()
• read lock: all other (public) methods

updateLock

protected final java.util.concurrent.locks.ReentrantLock updateLock

Lock used to prevent concurrent calls to update methods like addStatement, clear, commit, etc. within a transaction.

Constructor Detail

SailConnectionBase

public SailConnectionBase(SailBase sailBase)

Method Detail

isOpen

public final boolean isOpen()
                     throws SailException

Description copied from interface: SailConnection

Checks whether this SailConnection is open. A SailConnection is open from the moment it is created until it is closed.

Specified by:

isOpen in interface SailConnection

Throws:

SailException

See Also:

SailConnection.close()

verifyIsOpen

protected void verifyIsOpen()
                     throws SailException

Throws:

SailException

close

public final void close()
                 throws SailException

Description copied from interface: SailConnection

Closes the connection. Any updates that haven't been committed yet will be rolled back. The connection can no longer be used once it is closed.

Specified by:

close in interface SailConnection

Throws:

SailException

finalize

protected void finalize()
                 throws java.lang.Throwable

Overrides:

finalize in class java.lang.Object

Throws:

java.lang.Throwable

evaluate

public final CloseableIteration<? extends BindingSet,QueryEvaluationException> evaluate(TupleExpr tupleExpr,
                                                                                        Dataset dataset,
                                                                                        BindingSet bindings,
                                                                                        boolean includeInferred)
                                                                                 throws SailException

Description copied from interface: SailConnection

Evaluates the supplied TupleExpr on the data contained in this Sail object, using the (optional) dataset and supplied bindings as input parameters.

Specified by:

evaluate in interface SailConnection

Parameters:

tupleExpr - The tuple expression to evaluate.

dataset - The dataset to use for evaluating the query, null to use the Sail's default dataset.

bindings - A set of input parameters for the query evaluation. The keys reference variable names that should be bound to the value they map to.

includeInferred - Indicates whether inferred triples are to be considered in the query result. If false, no inferred statements are returned; if true, inferred statements are returned if available

Returns:

The TupleQueryResult.

Throws:

SailException - If the Sail object encountered an error or unexpected situation internally.

getContextIDs

public final CloseableIteration<? extends Resource,SailException> getContextIDs()
                                                                         throws SailException

Description copied from interface: SailConnection

Returns the set of all unique context identifiers that are used to store statements.

Specified by:

getContextIDs in interface SailConnection

Returns:

An iterator over the context identifiers, should not contain any duplicates.

Throws:

SailException

getStatements

public final CloseableIteration<? extends Statement,SailException> getStatements(Resource subj,
                                                                                 URI pred,
                                                                                 Value obj,
                                                                                 boolean includeInferred,
                                                                                 Resource... contexts)
                                                                          throws SailException

Description copied from interface: SailConnection

Gets all statements from the specified contexts that have a specific subject, predicate and/or object. All three parameters may be null to indicate wildcards. The includeInferred parameter can be used to control which statements are fetched: all statements or only the statements that have been added explicitly.

Specified by:

getStatements in interface SailConnection

Parameters:

subj - A Resource specifying the subject, or null for a wildcard.

pred - A URI specifying the predicate, or null for a wildcard.

obj - A Value specifying the object, or null for a wildcard.

includeInferred - if false, no inferred statements are returned; if true, inferred statements are returned if available

contexts - The context(s) to get the data from. Note that this parameter is a vararg and as such is optional. If no contexts are specified the method operates on the entire repository. A null value can be used to match context-less statements.

Returns:

The statements matching the specified pattern.

Throws:

SailException - If the Sail object encountered an error or unexpected situation internally.

size

public final long size(Resource... contexts)
                throws SailException

Description copied from interface: SailConnection

Returns the number of (explicit) statements in the store, or in specific contexts.

Specified by:

size in interface SailConnection

Parameters:

contexts - The context(s) to determine the size of. Note that this parameter is a vararg and as such is optional. If no contexts are specified the method operates on the entire repository. A null value can be used to match context-less statements.

Returns:

The number of explicit statements in this store, or in the specified context(s).

Throws:

SailException

transactionActive

protected final boolean transactionActive()

autoStartTransaction

protected void autoStartTransaction()
                             throws SailException

Throws:

SailException

commit

public final void commit()
                  throws SailException

Description copied from interface: SailConnection

Commits any updates that have been performed since the last time SailConnection.commit() or SailConnection.rollback() was called.

Specified by:

commit in interface SailConnection

Throws:

SailException - If the SailConnection could not be committed.

rollback

public final void rollback()
                    throws SailException

Description copied from interface: SailConnection

Rolls back the SailConnection, discarding any uncommitted changes that have been made in this SailConnection.

Specified by:

rollback in interface SailConnection

Throws:

SailException - If the SailConnection could not be rolled back.

addStatement

public final void addStatement(Resource subj,
                               URI pred,
                               Value obj,
                               Resource... contexts)
                        throws SailException

Description copied from interface: SailConnection

Adds a statement to the store.

Specified by:

addStatement in interface SailConnection

Parameters:

subj - The subject of the statement to add.

pred - The predicate of the statement to add.

obj - The object of the statement to add.

contexts - The context(s) to add the statement to. Note that this parameter is a vararg and as such is optional. If no contexts are specified, a context-less statement will be added.

Throws:

SailException - If the statement could not be added.

removeStatements

public final void removeStatements(Resource subj,
                                   URI pred,
                                   Value obj,
                                   Resource... contexts)
                            throws SailException

Description copied from interface: SailConnection

Removes all statements matching the specified subject, predicate and object from the repository. All three parameters may be null to indicate wildcards.

Specified by:

removeStatements in interface SailConnection

Parameters:

subj - The subject of the statement that should be removed, or null to indicate a wildcard.

pred - The predicate of the statement that should be removed, or null to indicate a wildcard.

obj - The object of the statement that should be removed , or null to indicate a wildcard. *

contexts - The context(s) from which to remove the statement. Note that this parameter is a vararg and as such is optional. If no contexts are specified the method operates on the entire repository. A null value can be used to match context-less statements.

Throws:

SailException - If the statement could not be removed.

clear

public final void clear(Resource... contexts)
                 throws SailException

Description copied from interface: SailConnection

Removes all statements from the specified/all contexts. If no contexts are specified the method operates on the entire repository.

Specified by:

clear in interface SailConnection

Parameters:

contexts - The context(s) from which to remove the statements. Note that this parameter is a vararg and as such is optional. If no contexts are specified the method operates on the entire repository. A null value can be used to match context-less statements.

Throws:

SailException - If the statements could not be removed.

getNamespaces

public final CloseableIteration<? extends Namespace,SailException> getNamespaces()
                                                                          throws SailException

Description copied from interface: SailConnection

Gets the namespaces relevant to the data contained in this Sail object.

Specified by:

getNamespaces in interface SailConnection

Returns:

An iterator over the relevant namespaces, should not contain any duplicates.

Throws:

SailException - If the Sail object encountered an error or unexpected situation internally.

getNamespace

public final java.lang.String getNamespace(java.lang.String prefix)
                                    throws SailException

Description copied from interface: SailConnection

Gets the namespace that is mapped to the specified prefix.

Specified by:

getNamespace in interface SailConnection

Parameters:

prefix - A namespace prefix.

Returns:

The namespace name that the specified prefix maps to.

Throws:

SailException

setNamespace

public final void setNamespace(java.lang.String prefix,
                               java.lang.String name)
                        throws SailException

Description copied from interface: SailConnection

Sets the prefix of a namespace.

Specified by:

setNamespace in interface SailConnection

Parameters:

prefix - The new prefix.

name - The namespace name that the prefix maps to.

Throws:

SailException

removeNamespace

public final void removeNamespace(java.lang.String prefix)
                           throws SailException

Description copied from interface: SailConnection

Removes a namespace declaration by removing the association between a prefix and a namespace name.

Specified by:

removeNamespace in interface SailConnection

Parameters:

prefix - The namespace prefix of which the assocation with a namespace name is to be removed.

Throws:

SailException - If the namespace prefix could not be removed.

clearNamespaces

public final void clearNamespaces()
                           throws SailException

Description copied from interface: SailConnection

Removes all namespace declarations from the repository.

Specified by:

clearNamespaces in interface SailConnection

Throws:

SailException - If the namespaces could not be removed.

getSharedConnectionLock

protected Lock getSharedConnectionLock()
                                throws SailException

Deprecated. Use connectionLock directly instead.

Throws:

SailException

getExclusiveConnectionLock

protected Lock getExclusiveConnectionLock()
                                   throws SailException

Deprecated. Use connectionLock directly instead.

Throws:

SailException

getTransactionLock

@Deprecated
protected Lock getTransactionLock()
                           throws SailException

Deprecated. Use updateLock directly instead.

Throws:

SailException

registerIteration

protected <T,E extends java.lang.Exception> CloseableIteration<T,E> registerIteration(CloseableIteration<T,E> iter)

Registers an iteration as active by wrapping it in a SailBaseIteration object and adding it to the list of active iterations.

iterationClosed

protected void iterationClosed(org.openrdf.sail.helpers.SailBaseIteration iter)

Called by SailBaseIteration to indicate that it has been closed.

closeInternal

protected abstract void closeInternal()
                               throws SailException

Throws:

SailException

evaluateInternal

protected abstract CloseableIteration<? extends BindingSet,QueryEvaluationException> evaluateInternal(TupleExpr tupleExpr,
                                                                                                      Dataset dataset,
                                                                                                      BindingSet bindings,
                                                                                                      boolean includeInferred)
                                                                                               throws SailException

Throws:

SailException

getContextIDsInternal

protected abstract CloseableIteration<? extends Resource,SailException> getContextIDsInternal()
                                                                                       throws SailException

Throws:

SailException

getStatementsInternal

protected abstract CloseableIteration<? extends Statement,SailException> getStatementsInternal(Resource subj,
                                                                                               URI pred,
                                                                                               Value obj,
                                                                                               boolean includeInferred,
                                                                                               Resource... contexts)
                                                                                        throws SailException

Throws:

SailException

sizeInternal

protected abstract long sizeInternal(Resource... contexts)
                              throws SailException

Throws:

SailException

startTransactionInternal

protected abstract void startTransactionInternal()
                                          throws SailException

Throws:

SailException

commitInternal

protected abstract void commitInternal()
                                throws SailException

Throws:

SailException

rollbackInternal

protected abstract void rollbackInternal()
                                  throws SailException

Throws:

SailException

addStatementInternal

protected abstract void addStatementInternal(Resource subj,
                                             URI pred,
                                             Value obj,
                                             Resource... contexts)
                                      throws SailException

Throws:

SailException

removeStatementsInternal

protected abstract void removeStatementsInternal(Resource subj,
                                                 URI pred,
                                                 Value obj,
                                                 Resource... contexts)
                                          throws SailException

Throws:

SailException

clearInternal

protected abstract void clearInternal(Resource... contexts)
                               throws SailException

Throws:

SailException

getNamespacesInternal

protected abstract CloseableIteration<? extends Namespace,SailException> getNamespacesInternal()
                                                                                        throws SailException

Throws:

SailException

getNamespaceInternal

protected abstract java.lang.String getNamespaceInternal(java.lang.String prefix)
                                                  throws SailException

Throws:

SailException

setNamespaceInternal

protected abstract void setNamespaceInternal(java.lang.String prefix,
                                             java.lang.String name)
                                      throws SailException

Throws:

SailException

removeNamespaceInternal

protected abstract void removeNamespaceInternal(java.lang.String prefix)
                                         throws SailException

Throws:

SailException

clearNamespacesInternal

protected abstract void clearNamespacesInternal()
                                         throws SailException

Throws:

SailException