QueryContext (OpenJPA Parent POM 2.4.2 API)

All Known Subinterfaces:

Query

All Known Implementing Classes:

DelegatingQuery, DistributedQueryImpl, QueryImpl
```
public interface QueryContext
```
A query execution context.

Since:

0.4.0

Author:

Abe White

Method Summary

Methods
Modifier and Type	Method and Description
`Class<?>`	`classForName(String name, String[] imports)` Helper method to instantiate the class with the given name, taking into account the query's candidate package, automatic imports, and the given imports (if any).
`void`	`declareParameters(String params)` Declared parameters, for query languages that use them.
`Number`	`deleteInMemory(StoreQuery q, StoreQuery.Executor ex, Object[] params)` Helper method to delete the objects found by executing a query on the given executor.
`ClassMetaData[]`	`getAccessPathMetaDatas()` Return the classes that affect this query.
`AggregateListener`	`getAggregateListener(String tag)` Return the filter listener for the given tag, or null.
`Collection<AggregateListener>`	`getAggregateListeners()` The set of aggregate listeners.
`String`	`getAlias()` If this query is not a projection but places candidate results into a result class under an alias, return that alias.
`Collection<?>`	`getCandidateCollection()` Return the candidate collection, or `null` if an extent was specified instead of a collection.
`Class<?>`	`getCandidateType()` Return the class of the objects that this query will return, or `null` if this information is not available / not relevant.
`Object`	`getCompilation()` Return the query's compilation state.
`long`	`getEndRange()` Return the 0-based exclusive end index for the returned results, or `Long.MAX_VALUE` for no limit.
`FetchConfiguration`	`getFetchConfiguration()` Return the fetch configuration for this query.
`FilterListener`	`getFilterListener(String tag)` Return the filter listener for the given tag, or null.
`Collection<FilterListener>`	`getFilterListeners()` The set of filter listeners.
`boolean`	`getIgnoreChanges()` Whether to ignore changes in the current transaction.
`String`	`getLanguage()` The query language.
`int`	`getOperation()` Returns the operation that this query will be expected to perform.
`OrderedMap<Object,Class<?>>`	`getOrderedParameterTypes()` Return a map of parameter name to type for this query.
`String`	`getParameterDeclaration()` The parameter declaration.
`org.apache.commons.collections.map.LinkedMap`	`getParameterTypes()` Deprecated.
`String[]`	`getProjectionAliases()` If this query is a projection, return the projection aliases.
`Class<?>[]`	`getProjectionTypes()` If this query is a projection, return the projection types.
`Query`	`getQuery()` Return the query for this context.
`String`	`getQueryString()` The query string.
`String`	`getResultMappingName()` Name of a mapping from the result data to its object representation.
`Class<?>`	`getResultMappingScope()` Scope of a mapping from the result data to its object representation.
`Class<?>`	`getResultType()` Returns the result class that has been set through `setResultType(java.lang.Class<?>)`, or null if none.
`long`	`getStartRange()` Return the 0-based start index for the returned results.
`StoreContext`	`getStoreContext()` The persistence context for the query.
`Map<FieldMetaData,Value>`	`getUpdates()` If this query is a bulk update, return a map of the `FieldMetaData`s to `Constant`s.
`boolean`	`hasGrouping()` Return true if the query uses grouping.
`boolean`	`hasSubclasses()` Whether query results will include subclasses of the candidate class.
`boolean`	`isAggregate()` Return true if the query is an aggregate.
`boolean`	`isDistinct()` Affirms if this query results are distinct instance(s).
`boolean`	`isReadOnly()` Whether the query has been marked read-only.
`boolean`	`isUnique()` The unique flag.
`void`	`lock()` Synchronize on the query's internal lock.
`void`	`setCandidateType(Class<?> cls, boolean subs)` Set the candidate type.
`void`	`setRange(long start, long end)` Set the range of results to return.
`void`	`setReadOnly(boolean readOnly)` Whether the query has been marked read-only.
`void`	`setResultMapping(Class<?> scope, String name)` Name and scope of a mapping from the result data to its object representation.
`void`	`setResultType(Class<?> cls)` Specify the type of object in which the result of evaluating this query.
`void`	`setUnique(boolean unique)` Specify that the query will return only 1 result, rather than a collection.
`void`	`unlock()` Unlock the query's internal lock.
`Number`	`updateInMemory(StoreQuery q, StoreQuery.Executor ex, Object[] params)` Helper method to update the objects found by executing a query on the given executor.

- Method Detail
  - getQuery
```
Query getQuery()
```
    Return the query for this context. Note that the query will be unavailable in remote contexts, and this method may throw an exception to that effect.
  - getStoreContext
```
StoreContext getStoreContext()
```
    The persistence context for the query.
  - getFetchConfiguration
```
FetchConfiguration getFetchConfiguration()
```
    Return the fetch configuration for this query.
  - getOperation
```
int getOperation()
```
    Returns the operation that this query will be expected to perform.
    
    Since:
    
    0.4.0
    
    See Also:
    QueryOperations
  - getLanguage
```
String getLanguage()
```
    The query language.
  - getQueryString
```
String getQueryString()
```
    The query string.
  - getCandidateCollection
```
Collection<?> getCandidateCollection()
```
    Return the candidate collection, or null if an extent was specified instead of a collection.
  - getCandidateType
```
Class<?> getCandidateType()
```
    Return the class of the objects that this query will return, or null if this information is not available / not relevant.
  - hasSubclasses
```
boolean hasSubclasses()
```
    Whether query results will include subclasses of the candidate class.
  - setCandidateType
```
void setCandidateType(Class<?> cls,
                    boolean subs)
```
    Set the candidate type.
  - isReadOnly
```
boolean isReadOnly()
```
    Whether the query has been marked read-only.
  - setReadOnly
```
void setReadOnly(boolean readOnly)
```
    Whether the query has been marked read-only.
  - isUnique
```
boolean isUnique()
```
    The unique flag.
  - setUnique
```
void setUnique(boolean unique)
```
    Specify that the query will return only 1 result, rather than a collection. The execute method will return null if the query result size is 0.
    
    Since:
    
    0.3.0
  - isDistinct
```
boolean isDistinct()
```
    Affirms if this query results are distinct instance(s).
    
    Since:
    
    2.0.0
  - getResultMappingScope
```
Class<?> getResultMappingScope()
```
    Scope of a mapping from the result data to its object representation.
  - getResultMappingName
```
String getResultMappingName()
```
    Name of a mapping from the result data to its object representation.
  - setResultMapping
```
void setResultMapping(Class<?> scope,
                    String name)
```
    Name and scope of a mapping from the result data to its object representation.
  - getResultType
```
Class<?> getResultType()
```
    Returns the result class that has been set through setResultType(java.lang.Class<?>), or null if none.
  - setResultType
```
void setResultType(Class<?> cls)
```
    Specify the type of object in which the result of evaluating this query.
    
    Since:
    
    0.3.0
  - getStartRange
```
long getStartRange()
```
    Return the 0-based start index for the returned results.
  - getEndRange
```
long getEndRange()
```
    Return the 0-based exclusive end index for the returned results, or Long.MAX_VALUE for no limit.
  - setRange
```
void setRange(long start,
            long end)
```
    Set the range of results to return.
    
    Parameters:
    start - 0-based inclusive start index
    end - 0-based exclusive end index, or Long.MAX_VALUE for no limit
    Since:
    
    0.3.2
  - getParameterDeclaration
```
String getParameterDeclaration()
```
    The parameter declaration.
  - declareParameters
```
void declareParameters(String params)
```
    Declared parameters, for query languages that use them.
  - getOrderedParameterTypes
```
OrderedMap<Object,Class<?>> getOrderedParameterTypes()
```
    Return a map of parameter name to type for this query. The returned map will iterate in the order that the parameters were declared or, if they're implicit, used.
  - getParameterTypes
```
@Deprecated
org.apache.commons.collections.map.LinkedMap getParameterTypes()
```
    Deprecated.
    
    Return a map of parameter name to type for this query. The returned map will iterate in the order that the parameters were declared or, if they're implicit, used.
  - getUpdates
```
Map<FieldMetaData,Value> getUpdates()
```
    If this query is a bulk update, return a map of the FieldMetaDatas to Constants.
  - getIgnoreChanges
```
boolean getIgnoreChanges()
```
    Whether to ignore changes in the current transaction.
  - getCompilation
```
Object getCompilation()
```
    Return the query's compilation state.
  - getAlias
```
String getAlias()
```
    If this query is not a projection but places candidate results into a result class under an alias, return that alias.
  - getProjectionAliases
```
String[] getProjectionAliases()
```
    If this query is a projection, return the projection aliases.
  - getProjectionTypes
```
Class<?>[] getProjectionTypes()
```
    If this query is a projection, return the projection types.
  - isAggregate
```
boolean isAggregate()
```
    Return true if the query is an aggregate.
  - hasGrouping
```
boolean hasGrouping()
```
    Return true if the query uses grouping.
  - getAccessPathMetaDatas
```
ClassMetaData[] getAccessPathMetaDatas()
```
    Return the classes that affect this query.
  - getFilterListener
```
FilterListener getFilterListener(String tag)
```
    Return the filter listener for the given tag, or null.
  - getAggregateListener
```
AggregateListener getAggregateListener(String tag)
```
    Return the filter listener for the given tag, or null.
  - getFilterListeners
```
Collection<FilterListener> getFilterListeners()
```
    The set of filter listeners.
  - getAggregateListeners
```
Collection<AggregateListener> getAggregateListeners()
```
    The set of aggregate listeners.
  - deleteInMemory
```
Number deleteInMemory(StoreQuery q,
                    StoreQuery.Executor ex,
                    Object[] params)
```
    Helper method to delete the objects found by executing a query on the given executor.
  - updateInMemory
```
Number updateInMemory(StoreQuery q,
                    StoreQuery.Executor ex,
                    Object[] params)
```
    Helper method to update the objects found by executing a query on the given executor.
  - classForName
```
Class<?> classForName(String name,
                    String[] imports)
```
    Helper method to instantiate the class with the given name, taking into account the query's candidate package, automatic imports, and the given imports (if any). Returns null if the type cannot be found.
  - lock
```
void lock()
```
    Synchronize on the query's internal lock.
  - unlock
```
void unlock()
```
    Unlock the query's internal lock.

Interface QueryContext

Method Summary

Method Detail

getQuery

getStoreContext

getFetchConfiguration

getOperation

getLanguage

getQueryString

getCandidateCollection

getCandidateType

hasSubclasses

setCandidateType

isReadOnly

setReadOnly

isUnique

setUnique

isDistinct

getResultMappingScope

getResultMappingName

setResultMapping

getResultType

setResultType

getStartRange

getEndRange

setRange

getParameterDeclaration

declareParameters

getOrderedParameterTypes

getParameterTypes

getUpdates

getIgnoreChanges

getCompilation

getAlias

getProjectionAliases

getProjectionTypes

isAggregate

hasGrouping

getAccessPathMetaDatas

getFilterListener

getAggregateListener

getFilterListeners

getAggregateListeners

deleteInMemory

updateInMemory

classForName

lock

unlock