org.apache.openjpa.kernel
Interface StoreQuery

All Superinterfaces:

QueryOperations, Serializable

All Known Implementing Classes:

AbstractStoreQuery, ExpressionStoreQuery, JDBCStoreQuery, MethodStoreQuery, QueryCacheStoreQuery, SQLStoreQuery

public interface StoreQuery
extends QueryOperations, Serializable

Component that executes queries against the datastore. For expression-based queries, consider subclassing ExpressionStoreManagerQuery.

Since:

0.4.0

Author:

Abe White

Nested Class Summary

static interface	StoreQuery.Executor An executor provides a uniform interface to the mechanism for executing either an in-memory or datastore query.
static class	StoreQuery.Range A query result range.

Field Summary

static boolean[]	EMPTY_BOOLEANS
static Class[]	EMPTY_CLASSES
static ClassMetaData[]	EMPTY_METAS
static Object[]	EMPTY_OBJECTS
static LinkedMap	EMPTY_PARAMS
static String[]	EMPTY_STRINGS

Fields inherited from interface org.apache.openjpa.kernel.QueryOperations

OP_DELETE, OP_SELECT, OP_UPDATE

Method Summary

AggregateListener	getAggregateListener(String tag) Return the standard filter listener for the given tag, or null.
QueryContext	getContext() Return the query context that has been set.
FilterListener	getFilterListener(String tag) Return the standard filter listener for the given tag, or null.
void	invalidateCompilation() Invalidate any internal compilation state.
Object	newCompilation() Create a new compilation for this query.
Object	newCompilationKey() Create a new key for caching compiled query information.
StoreQuery.Executor	newDataStoreExecutor(ClassMetaData meta, boolean subs) Return an executor for datastore execution of this query.
StoreQuery.Executor	newInMemoryExecutor(ClassMetaData meta, boolean subs) Return an executor for in-memory execution of this query.
void	populateFromCompilation(Object comp) Populate internal data from compilation.
boolean	requiresCandidateType() Whether this query requires a candidate class.
boolean	requiresParameterDeclarations() Whether this query requires parameters to be declared.
void	setContext(QueryContext ctx) Set the current query context.
boolean	setQuery(Object query) This is invoked when the user or a facade creates a new query with an object that the system does not recognize.
boolean	supportsAbstractExecutors() Return true if this query supports execution against abstract or interface types.
boolean	supportsDataStoreExecution() True if this query supports datastore execution, false if it can only run in memory.
boolean	supportsInMemoryExecution() True if this query supports in-memory execution, false if it can only run against the datastore.
boolean	supportsParameterDeclarations() Whether this query supports declared parameters.

Field Detail

EMPTY_PARAMS

static final LinkedMap EMPTY_PARAMS

EMPTY_METAS

static final ClassMetaData[] EMPTY_METAS

EMPTY_STRINGS

static final String[] EMPTY_STRINGS

EMPTY_OBJECTS

static final Object[] EMPTY_OBJECTS

EMPTY_CLASSES

static final Class[] EMPTY_CLASSES

EMPTY_BOOLEANS

static final boolean[] EMPTY_BOOLEANS

Method Detail

getContext

QueryContext getContext()

Return the query context that has been set.

setContext

void setContext(QueryContext ctx)

Set the current query context. This will be called before use.

setQuery

boolean setQuery(Object query)

This is invoked when the user or a facade creates a new query with an object that the system does not recognize. Return true if the object is recognized by the store, false otherwise.

getFilterListener

FilterListener getFilterListener(String tag)

Return the standard filter listener for the given tag, or null.

getAggregateListener

AggregateListener getAggregateListener(String tag)

Return the standard filter listener for the given tag, or null.

newCompilationKey

Object newCompilationKey()

Create a new key for caching compiled query information. May be null.

newCompilation

Object newCompilation()

Create a new compilation for this query. May be null.

populateFromCompilation

void populateFromCompilation(Object comp)

Populate internal data from compilation.

invalidateCompilation

void invalidateCompilation()

Invalidate any internal compilation state.

supportsDataStoreExecution

boolean supportsDataStoreExecution()

True if this query supports datastore execution, false if it can only run in memory.

supportsInMemoryExecution

boolean supportsInMemoryExecution()

True if this query supports in-memory execution, false if it can only run against the datastore.

newInMemoryExecutor

StoreQuery.Executor newInMemoryExecutor(ClassMetaData meta,
                                        boolean subs)

Return an executor for in-memory execution of this query. Executors must be cachable and thread safe. If this class returns true from supportsAbstractExecutors(), the given metadata will always be for the candidate class of this query, or possibly null if the candidate class is not itself persistence capable (like an interface or abstract base class). Otherwise, the given type will be a mapped class.

Parameters:

subs - whether to include dependent mapped subclasses in the results; independent subclasses should never be included

newDataStoreExecutor

StoreQuery.Executor newDataStoreExecutor(ClassMetaData meta,
                                         boolean subs)

Return an executor for datastore execution of this query. Executors must be cachable and thread safe. If this class returns true from supportsAbstractExecutors(), the given metadata will always be for the candidate class of this query, or possibly null if the candidate class is not itself persistence capable (like an interface or abstract base class). Otherwise, the given type will be a mapped class.

Parameters:

subs - whether to include dependent mapped subclasses in the results; independent subclasses should never be included

supportsAbstractExecutors

boolean supportsAbstractExecutors()

Return true if this query supports execution against abstract or interface types. Returns false by default, meaning we will only request executors for persistent classes. In this case, we will automatically combine the results of the executors for all implementing classes if we execute a query for an interface for abstract type.

requiresCandidateType

boolean requiresCandidateType()

Whether this query requires a candidate class.

requiresParameterDeclarations

boolean requiresParameterDeclarations()

Whether this query requires parameters to be declared.

supportsParameterDeclarations

boolean supportsParameterDeclarations()

Whether this query supports declared parameters.