org.rhq.enterprise.server.util
Class BatchIterator<T>

java.lang.Object
  org.rhq.enterprise.server.util.BatchIterator<T>

All Implemented Interfaces:

Iterable<List<T>>

public class BatchIterator<T>
extends Object
implements Iterable<List<T>>

A convenience class for getting around the http://ora-01795.ora-code.com/ issue, which limits the size of the in-clause parameters to 1000. Can be used to take a large collection of ids, and iterate over them in batches. The default batch size using the single-argument constructor is 1000, but the constructor which takes two arguments allows overriding the batch size to any positive integer.

Author:

Joseph Marques, John Sanda

Field Summary

static int

DEFAULT_BATCH_SIZE

Constructor Summary

BatchIterator(List<T> data)

BatchIterator(List<T> data, int batchSize)

Method Summary

List<T>	getNextBatch()
boolean	hasMoreBatches()
Iterator<List<T>>	iterator()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

DEFAULT_BATCH_SIZE

public static final int DEFAULT_BATCH_SIZE

See Also:

Constant Field Values

Constructor Detail

BatchIterator

public BatchIterator(List<T> data)

BatchIterator

public BatchIterator(List<T> data,
                     int batchSize)

Method Detail

iterator

public Iterator<List<T>> iterator()

Specified by:

iterator in interface Iterable<List<T>>

hasMoreBatches

public boolean hasMoreBatches()

getNextBatch

public List<T> getNextBatch()