com.gemstone.gemfire.internal.cache.TStatelessLongObjectIterator Maven / Gradle / Ivy
/*
* Copyright (c) 2010-2015 Pivotal Software, Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/*
* Contains code from GNU Trove having the license below.
*
* Copyright (c) 2001, Eric D. Friedman All Rights Reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
package com.gemstone.gemfire.internal.cache;
import com.gemstone.gnu.trove.*;
import java.util.ConcurrentModificationException;
/**
* Iterator for maps of type long and Object.
*
* @author darrel
*/
public class TStatelessLongObjectIterator extends TIterator {
/** the collection being iterated over */
private final TStatelessLongObjectHashMap _map;
/**
* Creates an iterator over the specified map
*/
public TStatelessLongObjectIterator(TStatelessLongObjectHashMap map) {
super(map);
this._map = map;
}
/**
* Moves the iterator forward to the next entry in the underlying map.
*
* @exception java.util.NoSuchElementException if the iterator is already exhausted
*/
public void advance() {
moveToNextIndex();
}
/**
* Provides access to the key of the mapping at the iterator's position.
* Note that you must advance() the iterator at least once
* before invoking this method.
*
* @return the key of the entry at the iterator's current position.
*/
public long key() {
return _map._set[_index];
}
/**
* Provides access to the value of the mapping at the iterator's position.
* Note that you must advance() the iterator at least once
* before invoking this method.
*
* @return the value of the entry at the iterator's current position.
*/
public Object value() {
return _map._values[_index];
}
/**
* Replace the value of the mapping at the iterator's position with the
* specified value. Note that you must advance() the iterator at
* least once before invoking this method.
*
* @param val the value to set in the current entry
* @return the old value of the entry.
*/
public Object setValue(Object val) {
Object old = value();
_map._values[_index] = val;
return old;
}
/**
* Returns the index of the next value in the data structure
* or a negative value if the iterator is exhausted.
*
* @return an int value
* @exception ConcurrentModificationException if the underlying collection's
* size has been modified since the iterator was created.
*/
@Override
protected final int nextIndex() {
if (_expectedSize != _hash.size()) {
throw new ConcurrentModificationException();
}
long[] keys = _map._set;
long FREE = _map.getFreeValue();
int i = _index;
while (i-- > 0 && (keys[i] == FREE)) ;
return i;
}
}// TStatelessLongObjectIterator