gnu.trove.TObjectIntIterator Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of trove4j Show documentation
Show all versions of trove4j Show documentation
The Trove library provides high speed regular and primitive
collections for Java.
///////////////////////////////////////////////////////////////////////////////
// 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 gnu.trove;
import java.util.ConcurrentModificationException;
//////////////////////////////////////////////////
// THIS IS A GENERATED CLASS. DO NOT HAND EDIT! //
//////////////////////////////////////////////////
/**
* Iterator for maps of type Object and int.
*
* The iterator semantics for Trove's primitive maps is slightly different
* from those defined in java.util.Iterator, but still well within
* the scope of the pattern, as defined by Gamma, et al.
*
* This iterator does not implicitly advance to the next entry when
* the value at the current position is retrieved. Rather, you must explicitly
* ask the iterator to advance() and then retrieve either the key(),
* the value() or both. This is done so that you have the option, but not
* the obligation, to retrieve keys and/or values as your application requires, and
* without introducing wrapper objects that would carry both. As the iteration is
* stateful, access to the key/value parts of the current map entry happens in
* constant time.
*
* In practice, the iterator is akin to a "search finger" that you move from
* position to position. Read or write operations affect the current entry only and
* do not assume responsibility for moving the finger.
*
* Here are some sample scenarios for this class of iterator:
*
*
* // accessing keys/values through an iterator:
* for (TObjectIntIterator it = map.iterator();
* it.hasNext();) {
* it.advance();
* if (satisfiesCondition(it.key()) {
* doSomethingWithValue(it.value());
* }
* }
*
*
*
* // modifying values in-place through iteration:
* for (TObjectIntIterator it = map.iterator();
* it.hasNext();) {
* it.advance();
* if (satisfiesCondition(it.key()) {
* it.setValue(newValueForKey(it.key()));
* }
* }
*
*
*
* // deleting entries during iteration:
* for (TObjectIntIterator it = map.iterator();
* it.hasNext();) {
* it.advance();
* if (satisfiesCondition(it.key()) {
* it.remove();
* }
* }
*
*
*
* // faster iteration by avoiding hasNext():
* TObjectIntIterator iterator = map.iterator();
* for (int i = map.size(); i-- > 0;) {
* iterator.advance();
* doSomethingWithKeyAndValue(iterator.key(), iterator.value());
* }
*
*
* @author Eric D. Friedman
* @version $Id: O2PIterator.template,v 1.3 2007/01/22 16:56:39 robeden Exp $
*/
public class TObjectIntIterator extends TIterator {
private final TObjectIntHashMap _map;
public TObjectIntIterator(TObjectIntHashMap map) {
super(map);
this._map = map;
}
/**
* Returns the index of the next value in the data structure
* or a negative value if the iterator is exhausted.
*
* @return an int value
*/
protected final int nextIndex() {
if (_expectedSize != _hash.size()) {
throw new ConcurrentModificationException();
}
Object[] set = _map._set;
int i = _index;
while (i-- > 0 && (set[i] == null || set[i] == TObjectHash.REMOVED ||
set[i] == TObjectHash.FREE)) ;
return i;
}
/**
* Moves the iterator forward to the next entry in the underlying map.
*
* @throws 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 K key() {
return (K) _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 int 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 int setValue(int val) {
int old = value();
_map._values[_index] = val;
return old;
}
}// TObjectIntIterator