org.apache.openjpa.kernel
Class ExpressionStoreQuery.DataStoreExecutor

java.lang.Object
  org.apache.openjpa.kernel.AbstractStoreQuery.AbstractExecutor
      org.apache.openjpa.kernel.ExpressionStoreQuery.AbstractExpressionExecutor
          org.apache.openjpa.kernel.ExpressionStoreQuery.DataStoreExecutor

All Implemented Interfaces:

Serializable, StoreQuery.Executor

Direct Known Subclasses:

DistributedStoreQuery.ParallelExecutor

Enclosing class:

ExpressionStoreQuery

public static class ExpressionStoreQuery.DataStoreExecutor
extends ExpressionStoreQuery.AbstractExpressionExecutor
implements StoreQuery.Executor, Serializable

The DataStoreExecutor executes the query against the implementation's overridden executeQuery(org.apache.openjpa.kernel.StoreQuery, java.lang.Object[], org.apache.openjpa.kernel.StoreQuery.Range) method.

Author:

Marc Prud'hommeaux

See Also:

Serialized Form

Constructor Summary

ExpressionStoreQuery.DataStoreExecutor(ExpressionStoreQuery q, ClassMetaData meta, boolean subclasses, ExpressionParser parser, Object parsed)

Method Summary

Number	executeDelete(StoreQuery q, Object[] params) Deleted the objects that result from the execution of the query, retuning the number of objects that were deleted.
ResultObjectProvider	executeQuery(StoreQuery q, Object[] params, StoreQuery.Range range) Return the result of executing this query with the given parameter values.
Number	executeUpdate(StoreQuery q, Object[] params) Updates the objects that result from the execution of the query, retuning the number of objects that were updated.
String[]	getDataStoreActions(StoreQuery q, Object[] params, StoreQuery.Range range) Return a description of the commands that will be sent to the datastore in order to execute the query.
Object	getOrderingValue(StoreQuery q, Object[] params, Object resultObject, int orderIndex) Extract the value of the orderIndexth ordering expression in Query#getOrderingClauses from the given result object.
Class[]	getProjectionTypes(StoreQuery q) Return the expected types of the projections used by this query, or an empty array if not a projection.
QueryExpressions[]	getQueryExpressions() Return the parsed query expressions for our candidate types.

Methods inherited from class org.apache.openjpa.kernel.ExpressionStoreQuery.AbstractExpressionExecutor

assertNotContainer, getAccessPathMetaDatas, getAlias, getAscending, getOperation, getOrderedParameterTypes, getProjectionAliases, getRange, getResultClass, getResultShape, getUpdates, hasGrouping, isAggregate, isDistinct, isPacking, toParameterArray, validate

Methods inherited from class org.apache.openjpa.kernel.AbstractStoreQuery.AbstractExecutor

getParameterTypes

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.openjpa.kernel.StoreQuery.Executor

getAccessPathMetaDatas, getAlias, getAscending, getOperation, getOrderedParameterTypes, getParameterTypes, getProjectionAliases, getRange, getResultClass, getResultShape, getUpdates, hasGrouping, isAggregate, isDistinct, isPacking, toParameterArray, validate

Constructor Detail

ExpressionStoreQuery.DataStoreExecutor

public ExpressionStoreQuery.DataStoreExecutor(ExpressionStoreQuery q,
                                              ClassMetaData meta,
                                              boolean subclasses,
                                              ExpressionParser parser,
                                              Object parsed)

Method Detail

getQueryExpressions

public QueryExpressions[] getQueryExpressions()

Description copied from interface: StoreQuery.Executor

Return the parsed query expressions for our candidate types. The expressions are available only after query has been parsed.

Specified by:

getQueryExpressions in interface StoreQuery.Executor

Overrides:

getQueryExpressions in class AbstractStoreQuery.AbstractExecutor

executeQuery

public ResultObjectProvider executeQuery(StoreQuery q,
                                         Object[] params,
                                         StoreQuery.Range range)

Description copied from interface: StoreQuery.Executor

Return the result of executing this query with the given parameter values. If this query is a projection and this executor does not pack results itself, each element of the returned result object provider should be an object array containing the projection values.

Specified by:

executeQuery in interface StoreQuery.Executor

See Also:

StoreQuery.Executor.isPacking(org.apache.openjpa.kernel.StoreQuery)

executeDelete

public Number executeDelete(StoreQuery q,
                            Object[] params)

Description copied from interface: StoreQuery.Executor

Deleted the objects that result from the execution of the query, retuning the number of objects that were deleted.

Specified by:

executeDelete in interface StoreQuery.Executor

Overrides:

executeDelete in class AbstractStoreQuery.AbstractExecutor

executeUpdate

public Number executeUpdate(StoreQuery q,
                            Object[] params)

Description copied from interface: StoreQuery.Executor

Updates the objects that result from the execution of the query, retuning the number of objects that were updated.

Specified by:

executeUpdate in interface StoreQuery.Executor

Overrides:

executeUpdate in class AbstractStoreQuery.AbstractExecutor

getDataStoreActions

public String[] getDataStoreActions(StoreQuery q,
                                    Object[] params,
                                    StoreQuery.Range range)

Description copied from interface: StoreQuery.Executor

Return a description of the commands that will be sent to the datastore in order to execute the query.

Specified by:

getDataStoreActions in interface StoreQuery.Executor

Overrides:

getDataStoreActions in class AbstractStoreQuery.AbstractExecutor

getOrderingValue

public Object getOrderingValue(StoreQuery q,
                               Object[] params,
                               Object resultObject,
                               int orderIndex)

Description copied from interface: StoreQuery.Executor

Extract the value of the orderIndexth ordering expression in Query#getOrderingClauses from the given result object. The result object will be an object from the result object provider returned from StoreQuery.Executor.executeQuery(org.apache.openjpa.kernel.StoreQuery, java.lang.Object[], org.apache.openjpa.kernel.StoreQuery.Range). This method is used when several result lists have to be merged in memory. If this exeuctor's parent query supports executors on abstract or interface classes, this method will not be used.

Specified by:

getOrderingValue in interface StoreQuery.Executor

Overrides:

getOrderingValue in class AbstractStoreQuery.AbstractExecutor

See Also:

StoreQuery.supportsAbstractExecutors()

getProjectionTypes

public Class[] getProjectionTypes(StoreQuery q)

Description copied from interface: StoreQuery.Executor

Return the expected types of the projections used by this query, or an empty array if not a projection.

Specified by:

getProjectionTypes in interface StoreQuery.Executor

Overrides:

getProjectionTypes in class ExpressionStoreQuery.AbstractExpressionExecutor