Package org.eclipse.rdf4j.spring.support.query

Class DelegatingGraphQuery

java.lang.Object
org.eclipse.rdf4j.spring.support.query.DelegatingGraphQuery
All Implemented Interfaces:
GraphQuery, Operation, Query
Direct Known Subclasses:
LoggingGraphQuery, ResultCachingGraphQuery
public abstract class DelegatingGraphQuery extends Object implements GraphQuery
Since:
4.0.0
Author:
Florian Kleedorfer

  • Constructor Details

    • DelegatingGraphQuery

      public DelegatingGraphQuery(GraphQuery delegate)

  • Method Details

    • getDelegate

      protected GraphQuery getDelegate()

    • evaluate

      public GraphQueryResult evaluate() throws QueryEvaluationException
      Specified by:
      evaluate in interface GraphQuery
      Throws:
      QueryEvaluationException

    • evaluate

      public void evaluate(RDFHandler handler) throws QueryEvaluationException, RDFHandlerException
      Specified by:
      evaluate in interface GraphQuery
      Throws:
      QueryEvaluationException
      RDFHandlerException

    • setMaxQueryTime

      @Deprecated public void setMaxQueryTime(int maxQueryTime)
      Deprecated.
      Description copied from interface: Query
      Specifies the maximum time that a query is allowed to run. The query will be interrupted when it exceeds the time limit. Any consecutive requests to fetch query results will result in QueryInterruptedExceptions.
      Specified by:
      setMaxQueryTime in interface Query
      Parameters:
      maxQueryTime - The maximum query time, measured in seconds. A negative or zero value indicates an unlimited query time (which is the default).

    • getMaxQueryTime

      @Deprecated public int getMaxQueryTime()
      Deprecated.
      Description copied from interface: Query
      Returns the maximum query evaluation time.
      Specified by:
      getMaxQueryTime in interface Query
      Returns:
      The maximum query evaluation time, measured in seconds.
      See Also:

    • explain

      @Experimental public Explanation explain(Explanation.Level level)
      Description copied from interface: Query

      Explain how the query will be (or has been) executed/evaluated by returning an explanation of the query plan.

      This method is useful for understanding why a particular query is slow. The most useful level is Executed, but this takes as long as it takes to execute/evaluate the query.

      When timing a query you should keep in mind that the query performance will vary based on how much the JIT compiler has compiled the code (C1 vs C2) and based on what is or isn't cached in memory. If Timed explanations are considerably slower than Executed explanations the overhead with timing the query may be large on your system and should not be trusted.

      WARNING: This method is experimental and is subject to change or removal without warning. Same goes for the returned explanation. There is currently only partial support for this method in RDF4J and and UnsupportedOperationException where support is lacking.

      Specified by:
      explain in interface Query
      Parameters:
      level - The explanation level that should be used to create the explanation. Choose between: Unoptimized (as parsed without optimizations) , Optimized (as is actually going to be used), Executed (as was executed/evaluated, including some real performance metrics), Timed (as was executed/evaluated including all real performance metrics). Executed and Timed level can potentially be slow.
      Returns:
      The explanation that we generated, which can be viewed in a human readable format with toString(), as JSON or as a simplified query plan object structure.

    • setBinding

      public void setBinding(String name, Value value)
      Description copied from interface: Operation
      Binds the specified variable to the supplied value. Any value that was previously bound to the specified value will be overwritten.
      Specified by:
      setBinding in interface Operation
      Parameters:
      name - The name of the variable that should be bound.
      value - The (new) value for the specified variable.

    • removeBinding

      public void removeBinding(String name)
      Description copied from interface: Operation
      Removes a previously set binding on the supplied variable. Calling this method with an unbound variable name has no effect.
      Specified by:
      removeBinding in interface Operation
      Parameters:
      name - The name of the variable from which the binding is to be removed.

    • clearBindings

      public void clearBindings()
      Description copied from interface: Operation
      Removes all previously set bindings.
      Specified by:
      clearBindings in interface Operation

    • getBindings

      public BindingSet getBindings()
      Description copied from interface: Operation
      Retrieves the bindings that have been set on this operation.
      Specified by:
      getBindings in interface Operation
      Returns:
      A (possibly empty) set of operation variable bindings.
      See Also:

    • setDataset

      public void setDataset(Dataset dataset)
      Description copied from interface: Operation
      Specifies the dataset against which to execute an operation, overriding any dataset that is specified in the operation itself.
      Specified by:
      setDataset in interface Operation

    • getDataset

      public Dataset getDataset()
      Description copied from interface: Operation
      Gets the dataset that has been set using Operation.setDataset(Dataset), if any.
      Specified by:
      getDataset in interface Operation

    • setIncludeInferred

      public void setIncludeInferred(boolean includeInferred)
      Description copied from interface: Operation
      Determine whether evaluation results of this operation should include inferred statements (if any inferred statements are present in the repository). The default setting is 'true'.
      Specified by:
      setIncludeInferred in interface Operation
      Parameters:
      includeInferred - indicates whether inferred statements should be included in the result.

    • getIncludeInferred

      public boolean getIncludeInferred()
      Description copied from interface: Operation
      Returns whether or not this operation will return inferred statements (if any are present in the repository).
      Specified by:
      getIncludeInferred in interface Operation
      Returns:
      true if inferred statements will be returned, false otherwise.

    • setMaxExecutionTime

      public void setMaxExecutionTime(int maxExecutionTimeSeconds)
      Description copied from interface: Operation
      Specifies the maximum time that an operation is allowed to run. The operation will be interrupted when it exceeds the time limit. Any consecutive requests to fetch query results will result in QueryInterruptedExceptions or UpdateExecutionExceptions (depending on whether the operation is a query or an update).
      Specified by:
      setMaxExecutionTime in interface Operation
      Parameters:
      maxExecutionTimeSeconds - The maximum query time, measured in seconds. A negative or zero value indicates an unlimited execution time (which is the default).

    • getMaxExecutionTime

      public int getMaxExecutionTime()
      Description copied from interface: Operation
      Returns the maximum operation execution time.
      Specified by:
      getMaxExecutionTime in interface Operation
      Returns:
      The maximum operation execution time, measured in seconds.
      See Also:

    • toString

      public String toString()
      Overrides:
      toString in class Object