org.apache.openjpa.jdbc.kernel

Class SelectResultObjectProvider

java.lang.Object

org.apache.openjpa.jdbc.kernel.SelectResultObjectProvider

All Implemented Interfaces:

ResultObjectProvider, Closeable

Direct Known Subclasses:

InstanceResultObjectProvider, PagingResultObjectProvider

public abstract class SelectResultObjectProvider
extends Object
implements ResultObjectProvider

Abstract provider implementation wrapped around a Select.

Author:

Abe White

Field Summary

Fields

Modifier and Type	Field and Description
protected Result	_res

Constructor Summary

Constructors

Constructor and Description
SelectResultObjectProvider(SelectExecutor sel, JDBCStore store, JDBCFetchConfiguration fetch) Constructor.

Method Summary

Methods

Modifier and Type	Method and Description
boolean	absolute(int pos) Move to the given 0-based position.
void	close() Free the resources associated with this provider.
JDBCFetchConfiguration	getFetchConfiguration()
Result	getResult()
SelectExecutor	getSelect()
JDBCStore	getStore()
void	handleCheckedException(Exception e) Any checked exceptions that are thrown will be passed to this method.
boolean	next() Advance the input to the next position.
void	open() Open the result.
void	reset() Reset this provider.
protected void	setSize(int size) Allow subclasses that know the size to set it; otherwise we calculate it internally.
int	size() Return the number of items in the input, or Integer.MAX_VALUE if the size in unknown.
boolean	supportsRandomAccess() Return true if this provider supports random access.

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.lib.rop.ResultObjectProvider

getResultObject

Field Detail

_res

protected Result _res

Constructor Detail

SelectResultObjectProvider

public SelectResultObjectProvider(SelectExecutor sel,
                          JDBCStore store,
                          JDBCFetchConfiguration fetch)

Constructor.

Parameters:

sel - the select to execute

store - the store to delegate loading to

fetch - the fetch configuration, or null for the default

Method Detail

getSelect

public SelectExecutor getSelect()

getStore

public JDBCStore getStore()

getFetchConfiguration

public JDBCFetchConfiguration getFetchConfiguration()

getResult

public Result getResult()

supportsRandomAccess

public boolean supportsRandomAccess()

Description copied from interface: ResultObjectProvider

Return true if this provider supports random access.

Specified by:

supportsRandomAccess in interface ResultObjectProvider

open

public void open()
          throws SQLException

Description copied from interface: ResultObjectProvider

Open the result. This will be called before ResultObjectProvider.next(), ResultObjectProvider.absolute(int), or ResultObjectProvider.size().

Specified by:

open in interface ResultObjectProvider

Throws:

SQLException

next

public boolean next()
             throws SQLException

Description copied from interface: ResultObjectProvider

Advance the input to the next position. Return true if there is more data; otherwise false.

Specified by:

next in interface ResultObjectProvider

Throws:

SQLException

absolute

public boolean absolute(int pos)
                 throws SQLException

Description copied from interface: ResultObjectProvider

Move to the given 0-based position. This method is only called for providers that support random access. Return true if there is data at this position; otherwise false. This may be invoked in place of ResultObjectProvider.next().

Specified by:

absolute in interface ResultObjectProvider

Throws:

SQLException

size

public int size()
         throws SQLException

Description copied from interface: ResultObjectProvider

Return the number of items in the input, or Integer.MAX_VALUE if the size in unknown.

Specified by:

size in interface ResultObjectProvider

Throws:

SQLException

setSize

protected void setSize(int size)

Allow subclasses that know the size to set it; otherwise we calculate it internally.

reset

public void reset()
           throws SQLException

Description copied from interface: ResultObjectProvider

Reset this provider. This is an optional operation. If supported, it should move the position of the provider to before the first element. Non-random-access providers may be able to support this method by re-acquiring all resources as if the result were just opened.

Specified by:

reset in interface ResultObjectProvider

Throws:

SQLException

close

public void close()

Description copied from interface: ResultObjectProvider

Free the resources associated with this provider.

Specified by:

close in interface ResultObjectProvider

Specified by:

close in interface Closeable

handleCheckedException

public void handleCheckedException(Exception e)

Description copied from interface: ResultObjectProvider

Any checked exceptions that are thrown will be passed to this method. The provider should re-throw the exception as an appropriate unchecked exception.

Specified by:

handleCheckedException in interface ResultObjectProvider