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java.lang.Objectorg.apache.openjpa.lib.rop.MergedResultObjectProvider
public class MergedResultObjectProvider
A result object provider that merges multiple result object provider delegates. Support exists for maintaining ordering of the internally held results, provided that each of the individual results is itself ordered.
Constructor Summary | |
---|---|
MergedResultObjectProvider(ResultObjectProvider[] rops)
Constructor. |
|
MergedResultObjectProvider(ResultObjectProvider[] rops,
Comparator comp)
Constructor. |
Method Summary | |
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boolean |
absolute(int pos)
Move to the given 0-based position. |
void |
close()
Free the resources associated with this provider. |
protected Object |
getOrderingValue(Object val,
int idx,
ResultObjectProvider rop)
Return the value to use for ordering on the given result value. |
Object |
getResultObject()
Instantiate the current result object. |
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. |
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 |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public MergedResultObjectProvider(ResultObjectProvider[] rops)
public MergedResultObjectProvider(ResultObjectProvider[] rops, Comparator comp)
Method Detail |
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public boolean supportsRandomAccess()
ResultObjectProvider
supportsRandomAccess
in interface ResultObjectProvider
public void open() throws Exception
ResultObjectProvider
ResultObjectProvider.next()
, ResultObjectProvider.absolute(int)
, or ResultObjectProvider.size()
.
open
in interface ResultObjectProvider
Exception
public boolean absolute(int pos) throws Exception
ResultObjectProvider
true
if there is data at this position;
otherwise false
. This may be invoked in place of
ResultObjectProvider.next()
.
absolute
in interface ResultObjectProvider
Exception
public int size() throws Exception
ResultObjectProvider
Integer.MAX_VALUE
if the size in unknown.
size
in interface ResultObjectProvider
Exception
public void reset() throws Exception
ResultObjectProvider
reset
in interface ResultObjectProvider
Exception
public void close() throws Exception
ResultObjectProvider
close
in interface ResultObjectProvider
close
in interface Closeable
Exception
public void handleCheckedException(Exception e)
ResultObjectProvider
handleCheckedException
in interface ResultObjectProvider
public boolean next() throws Exception
ResultObjectProvider
true
if
there is more data; otherwise false
.
next
in interface ResultObjectProvider
Exception
public Object getResultObject() throws Exception
ResultObjectProvider
ResultObjectProvider.next()
or ResultObjectProvider.absolute(int)
.
getResultObject
in interface ResultObjectProvider
Exception
protected Object getOrderingValue(Object val, int idx, ResultObjectProvider rop)
val
- the result valueidx
- the index of the result object provider in the array
given on construction that produced the result valuerop
- the result object provider that produced the result value
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This documentation is deprecated and will be removed in the next release of WebLogic Server.