Class AbstractSailConnection

java.lang.Object
org.eclipse.rdf4j.sail.helpers.AbstractSailConnection
All Implemented Interfaces:
AutoCloseable, SailConnection
Direct Known Subclasses:
AbstractNotifyingSailConnection, FedXConnection

public abstract class AbstractSailConnection extends Object implements SailConnection
Abstract Class offering base functionality for SailConnection implementations.
Author:
Arjohn Kampman, Jeen Broekstra
  • Constructor Details

    • AbstractSailConnection

      public AbstractSailConnection(AbstractSail sailBase)
  • Method Details

    • 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:
    • verifyIsOpen

      protected void verifyIsOpen() throws SailException
      Throws:
      SailException
    • verifyIsActive

      protected void verifyIsActive() throws SailException
      Verifies if a transaction is currently active. Throws a SailException if no transaction is active.
      Throws:
      SailException - if no transaction is active.
    • begin

      public void begin() throws SailException
      Description copied from interface: SailConnection
      Begins a transaction requiring SailConnection.commit() or SailConnection.rollback() to be called to close the transaction. The transaction will use the default IsolationLevel level for the SAIL, as returned by Sail.getDefaultIsolationLevel().
      Specified by:
      begin in interface SailConnection
      Throws:
      SailException - If the connection could not start a transaction or if a transaction is already active on this connection.
    • begin

      public void begin(IsolationLevel isolationLevel) throws SailException
      Description copied from interface: SailConnection
      Begins a transaction with the specified IsolationLevel level, requiring SailConnection.commit() or SailConnection.rollback() to be called to close the transaction.
      Specified by:
      begin in interface SailConnection
      Parameters:
      isolationLevel - the transaction isolation level on which this transaction operates.
      Throws:
      SailException - If the connection could not start a transaction, if the supplied transaction isolation level is not supported, or if a transaction is already active on this connection.
    • getTransactionIsolation

      protected IsolationLevel getTransactionIsolation()
      Retrieve the currently set IsolationLevel.
      Returns:
      the current IsolationLevel. If no transaction is active, this may be null.
    • isActive

      public boolean isActive() throws UnknownSailTransactionStateException
      Description copied from interface: SailConnection
      Indicates if a transaction is currently active on the connection. A transaction is active if SailConnection.begin() has been called, and becomes inactive after SailConnection.commit() or SailConnection.rollback() has been called.
      Specified by:
      isActive in interface SailConnection
      Returns:
      true iff a transaction is active, false iff no transaction is active.
      Throws:
      UnknownSailTransactionStateException - if the transaction state can not be determined (this can happen for instance when communication between client and server fails or times out).
    • 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 AutoCloseable
      Specified by:
      close in interface SailConnection
      Throws:
      SailException
    • evaluate

      public final CloseableIteration<? extends BindingSet> 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> 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> getStatements(Resource subj, IRI 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.
    • hasStatement

      public final boolean hasStatement(Resource subj, IRI pred, Value obj, boolean includeInferred, Resource... contexts) throws SailException
      Description copied from interface: SailConnection
      Determines if the store contains any 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 checked: all statements or only the statements that have been added explicitly.
      Specified by:
      hasStatement in interface SailConnection
      Parameters:
      subj - A Resource specifying the subject, or null for a wildcard.
      pred - An IRI 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:
      true iff the store contains any statements matching the supplied criteria, false otherwise.
      Throws:
      SailException - If the Sail object encountered an error or unexpected situation internally.
    • hasStatementInternal

      protected boolean hasStatementInternal(Resource subj, IRI pred, Value obj, boolean includeInferred, Resource[] contexts)
    • 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

      @Deprecated(since="2.7.0") protected void autoStartTransaction() throws SailException
      Deprecated.
      Use verifyIsActive() instead. We should not automatically start a transaction at the sail level. Instead, an exception should be thrown when an update is executed without first starting a transaction.
      IMPORTANT Since Sesame 2.7.0. this method no longer automatically starts a transaction, but instead verifies if a transaction is active and if not throws an exception. The method is left in for transitional purposes only. Sail implementors are advised that by contract, any update operation on the Sail should check if a transaction has been started via SailConnection.isActive() and throw a SailException if not. Implementors can use verifyIsActive() as a convenience method for this check.
      Throws:
      SailException - if no transaction is active.
    • flush

      public void flush() throws SailException
      Description copied from interface: SailConnection
      Flushes any pending updates and notify changes to listeners as appropriate. This is an optional call; calling or not calling this method should have no effect on the outcome of other calls. This method exists to give the caller more control over the efficiency when calling SailConnection.prepare(). This method may be called multiple times within the same transaction.
      Specified by:
      flush in interface SailConnection
      Throws:
      SailException - If the updates could not be processed, for example because no transaction is active.
    • prepare

      public final void prepare() throws SailException
      Description copied from interface: SailConnection
      Checks for an error state in the active transaction that would force the transaction to be rolled back. This is an optional call; calling or not calling this method should have no effect on the outcome of SailConnection.commit() or SailConnection.rollback(). A call to this method must be followed by (in the same thread) with a call to SailConnection.prepare() , SailConnection.commit(), SailConnection.rollback(), or SailConnection.close() . This method may be called multiple times within the same transaction by the same thread. If this method returns normally, the caller can reasonably expect that a subsequent call to SailConnection.commit() will also return normally. If this method returns with an exception the caller should treat the exception as if it came from a call to SailConnection.commit().
      Specified by:
      prepare in interface SailConnection
      Throws:
      SailException - If there is an active transaction and it cannot be committed.
    • 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 transaction, 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, IRI 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, for example because no transaction is active.
    • removeStatements

      public final void removeStatements(Resource subj, IRI 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, for example because no transaction is active.
    • startUpdate

      public void startUpdate(UpdateContext op) throws SailException
      Description copied from interface: SailConnection
      Specified by:
      startUpdate in interface SailConnection
      Throws:
      SailException
    • addStatement

      public void addStatement(UpdateContext op, Resource subj, IRI pred, Value obj, Resource... contexts) throws SailException
      The default implementation buffers added statements until the update operation is complete.
      Specified by:
      addStatement in interface SailConnection
      Parameters:
      op - operation properties of the UpdateExpr operation producing these statements.
      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, for example because no transaction is active.
    • removeStatement

      public void removeStatement(UpdateContext op, Resource subj, IRI pred, Value obj, Resource... contexts) throws SailException
      The default implementation buffers removed statements until the update operation is complete.
      Specified by:
      removeStatement in interface SailConnection
      Parameters:
      op - operation properties of the UpdateExpr operation removing these statements.
      subj - The subject of the statement that should be removed.
      pred - The predicate of the statement that should be removed.
      obj - The object of the statement that should be removed.
      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, for example because no transaction is active.
    • endUpdate

      public final void endUpdate(UpdateContext op) throws SailException
      Description copied from interface: SailConnection
      Indicates that the given op will not be used in any call again. Implementations should use this to flush of any temporary operation states that may have occurred.
      Specified by:
      endUpdate in interface SailConnection
      Parameters:
      op -
      Throws:
      SailException
    • endUpdateInternal

      protected void endUpdateInternal(UpdateContext op) throws SailException
      Throws:
      SailException
    • 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> 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 String getNamespace(String prefix) throws SailException
      Description copied from interface: SailConnection
      Gets the namespace that is associated with the specified prefix, if any.
      Specified by:
      getNamespace in interface SailConnection
      Parameters:
      prefix - A namespace prefix, or an empty string in case of the default namespace.
      Returns:
      The namespace name that is associated with the specified prefix, or null if there is no such namespace.
      Throws:
      SailException - If the Sail object encountered an error or unexpected situation internally.
    • setNamespace

      public final void setNamespace(String prefix, String name) throws SailException
      Description copied from interface: SailConnection
      Sets the prefix for a namespace.
      Specified by:
      setNamespace in interface SailConnection
      Parameters:
      prefix - The new prefix, or an empty string in case of the default namespace.
      name - The namespace name that the prefix maps to.
      Throws:
      SailException - If the Sail object encountered an error or unexpected situation internally.
    • removeNamespace

      public final void removeNamespace(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, or an empty string in case of the default namespace.
      Throws:
      SailException - If the Sail object encountered an error or unexpected situation internally.
    • 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 Sail object encountered an error or unexpected situation internally.
    • pendingRemovals

      public boolean pendingRemovals()
      Description copied from interface: SailConnection
      Indicates if the Sail has any statement removal operations pending (not yet flushed) for the current transaction.
      Specified by:
      pendingRemovals in interface SailConnection
      Returns:
      true if any statement removal operations have not yet been flushed, false otherwise.
      See Also:
    • pendingAdds

      protected boolean pendingAdds()
    • setStatementsAdded

      protected void setStatementsAdded()
    • setStatementsRemoved

      protected void setStatementsRemoved()
    • registerIteration

      protected <T, E extends Exception> CloseableIteration<T> registerIteration(CloseableIteration<T> 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.eclipse.rdf4j.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> evaluateInternal(TupleExpr tupleExpr, Dataset dataset, BindingSet bindings, boolean includeInferred) throws SailException
      Throws:
      SailException
    • getContextIDsInternal

      protected abstract CloseableIteration<? extends Resource> getContextIDsInternal() throws SailException
      Throws:
      SailException
    • getStatementsInternal

      protected abstract CloseableIteration<? extends Statement> getStatementsInternal(Resource subj, IRI 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
    • prepareInternal

      protected void prepareInternal() 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, IRI pred, Value obj, Resource... contexts) throws SailException
      Throws:
      SailException
    • removeStatementsInternal

      protected abstract void removeStatementsInternal(Resource subj, IRI 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> getNamespacesInternal() throws SailException
      Throws:
      SailException
    • getNamespaceInternal

      protected abstract String getNamespaceInternal(String prefix) throws SailException
      Throws:
      SailException
    • setNamespaceInternal

      protected abstract void setNamespaceInternal(String prefix, String name) throws SailException
      Throws:
      SailException
    • removeNamespaceInternal

      protected abstract void removeNamespaceInternal(String prefix) throws SailException
      Throws:
      SailException
    • clearNamespacesInternal

      protected abstract void clearNamespacesInternal() throws SailException
      Throws:
      SailException
    • isActiveOperation

      protected boolean isActiveOperation()
    • getSailBase

      protected AbstractSail getSailBase()