litesoft
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package org.litesoft.core.util;
import java.util.*;
public class SizedIterator<T> extends AbstractReadOnlyIterator<T> implements Disposable
{
private final Long mSize;
private Iterator<T> mIterator; // Note this is neither Volatile nor properly syncronized. If properly used, an old reference should not harm anything!
public SizedIterator( long pSize )
{
mSize = UtilsCommon.assertNotNegative( "Size", pSize );
mIterator = NullIterator.getInstance();
}
public SizedIterator( Iterator<T> pIterator )
{
mSize = null;
if ( pIterator != null )
{
mIterator = pIterator;
}
else
{
mIterator = NullIterator.getInstance();
}
}
/**
* @return May be Null...
*/
public Long size()
{
return mSize;
}
public boolean hasNext()
{
return mIterator.hasNext();
}
@Override
public T next()
{
return mIterator.next();
}
private synchronized Iterator<T> replace( Iterator<T> pIterator )
{
Iterator<T> rv = mIterator;
mIterator = pIterator;
return rv;
}
public void dispose()
{
Iterator<T> zIterator = NullIterator.getInstance();
zIterator = replace( zIterator );
if ( zIterator instanceof Disposable )
{
((Disposable) zIterator).dispose();
}
}
@Override
protected void finalize()
throws Throwable
{
dispose();
super.finalize();
}
}
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Revision |
Author |
Commited |
Message |
2
|
GeorgeS
|
Sun 07 Feb, 2010 12:50:58 +0000 |
|