org.apache.openjpa.kernel
Class AbstractStoreQuery.AbstractExecutor

java.lang.Object
  org.apache.openjpa.kernel.AbstractStoreQuery.AbstractExecutor

All Implemented Interfaces:

StoreQuery.Executor

Direct Known Subclasses:

ExpressionStoreQuery.AbstractExpressionExecutor, SQLStoreQuery.SQLExecutor

Enclosing class:

AbstractStoreQuery

public abstract static class AbstractStoreQuery.AbstractExecutor
extends Object
implements StoreQuery.Executor

Abstract AbstractStoreQuery.AbstractExecutor that implements most methods as no-ops.

Constructor Summary

AbstractStoreQuery.AbstractExecutor()

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.
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.
ClassMetaData[]	getAccessPathMetaDatas(StoreQuery q) Return an array of all persistent classes used in this query, or empty array if unknown.
String	getAlias(StoreQuery q) If this is not a projection but the candidate results are placed into a result class with an alias, return that alias.
boolean[]	getAscending(StoreQuery q) Return the ordering direction for all ordering clauses, or empty array if none.
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.
int	getOperation(StoreQuery q) Returns the operation this executor is meant to execute.
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.
LinkedMap	getParameterTypes(StoreQuery q) Return a map of parameter names to types.
String[]	getProjectionAliases(StoreQuery q) Return the alias for each projection element, or empty array if not a projection.
Class[]	getProjectionTypes(StoreQuery q) Return the expected types of the projections used by this query, or an empty array if not a projection.
void	getRange(StoreQuery q, Object[] params, StoreQuery.Range range) Mutate the given range to set any range information stored in the query string and/or parameters.
Class	getResultClass(StoreQuery q) Returns the result class, if any.
Map	getUpdates(StoreQuery q) Return a map of FieldMetaData to update Constants, in cases where this query is for a bulk update.
boolean	hasGrouping(StoreQuery q) Whether the compiled query has grouping.
boolean	isAggregate(StoreQuery q) Return true if the compiled query is an aggregate.
boolean	isPacking(StoreQuery q) Return true if this executor packs projections into the result class itself.
void	validate(StoreQuery q) Validate components of query.

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

executeQuery

Constructor Detail

AbstractStoreQuery.AbstractExecutor

public AbstractStoreQuery.AbstractExecutor()

Method Detail

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

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

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

validate

public void validate(StoreQuery q)

Description copied from interface: StoreQuery.Executor

Validate components of query.

Specified by:

validate in interface StoreQuery.Executor

getRange

public void getRange(StoreQuery q,
                     Object[] params,
                     StoreQuery.Range range)

Description copied from interface: StoreQuery.Executor

Mutate the given range to set any range information stored in the query string and/or parameters.

Specified by:

getRange in interface StoreQuery.Executor

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

See Also:

StoreQuery.supportsAbstractExecutors()

getAscending

public boolean[] getAscending(StoreQuery q)

Description copied from interface: StoreQuery.Executor

Return the ordering direction for all ordering clauses, or empty array if none.

Specified by:

getAscending in interface StoreQuery.Executor

isPacking

public boolean isPacking(StoreQuery q)

Description copied from interface: StoreQuery.Executor

Return true if this executor packs projections into the result class itself. Executors for query languages that allow projections without result clauses must return true and perform the result packing themselves.

Specified by:

isPacking in interface StoreQuery.Executor

getAlias

public String getAlias(StoreQuery q)

Description copied from interface: StoreQuery.Executor

If this is not a projection but the candidate results are placed into a result class with an alias, return that alias.

Specified by:

getAlias in interface StoreQuery.Executor

getProjectionAliases

public String[] getProjectionAliases(StoreQuery q)

Description copied from interface: StoreQuery.Executor

Return the alias for each projection element, or empty array if not a projection.

Specified by:

getProjectionAliases in interface StoreQuery.Executor

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

getAccessPathMetaDatas

public ClassMetaData[] getAccessPathMetaDatas(StoreQuery q)

Description copied from interface: StoreQuery.Executor

Return an array of all persistent classes used in this query, or empty array if unknown.

Specified by:

getAccessPathMetaDatas in interface StoreQuery.Executor

getOperation

public int getOperation(StoreQuery q)

Description copied from interface: StoreQuery.Executor

Returns the operation this executor is meant to execute.

Specified by:

getOperation in interface StoreQuery.Executor

See Also:

QueryOperations

isAggregate

public boolean isAggregate(StoreQuery q)

Description copied from interface: StoreQuery.Executor

Return true if the compiled query is an aggregate.

Specified by:

isAggregate in interface StoreQuery.Executor

hasGrouping

public boolean hasGrouping(StoreQuery q)

Description copied from interface: StoreQuery.Executor

Whether the compiled query has grouping.

Specified by:

hasGrouping in interface StoreQuery.Executor

getParameterTypes

public LinkedMap getParameterTypes(StoreQuery q)

Description copied from interface: StoreQuery.Executor

Return a map of parameter names to types. The returned Map.entrySet()'s Iterator must return values in the order in which they were declared or used.

Specified by:

getParameterTypes in interface StoreQuery.Executor

getResultClass

public Class getResultClass(StoreQuery q)

Description copied from interface: StoreQuery.Executor

Returns the result class, if any.

Specified by:

getResultClass in interface StoreQuery.Executor

getUpdates

public Map getUpdates(StoreQuery q)

Description copied from interface: StoreQuery.Executor

Return a map of FieldMetaData to update Constants, in cases where this query is for a bulk update.

Specified by:

getUpdates in interface StoreQuery.Executor