Current File : //home/waritko/yacy/source/net/yacy/cora/order/CloneableMapIterator.java
/**
* ByteOrder
* (C) 2007 by Michael Peter Christen; mc@yacy.net, Frankfurt a. M., Germany
* first published 25.04.2007 on http://yacy.net
*
* $LastChangedDate$
* $LastChangedRevision$
* $LastChangedBy$
*
* 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program in the file lgpl21.txt
* If not, see <http://www.gnu.org/licenses/>.
*/
package net.yacy.cora.order;
import java.util.Iterator;
import java.util.TreeMap;
public class CloneableMapIterator<E> implements CloneableIterator<E> {
TreeMap<E, ?> map;
E next, last;
Object start;
Iterator<E> iter;
public CloneableMapIterator(final TreeMap<E, ?> map, final E start) {
// map must contain eiter a byte[]/Object or a String/Object mapping.
// start must be either of type byte[] or String
// this iterator iterates then only the key elements of the map
this.map = map;
this.start = start;
this.iter = map.keySet().iterator();
if (this.start == null) {
if (this.iter.hasNext()) this.next = this.iter.next(); else this.next = null;
} else while (this.iter.hasNext()) {
this.next = this.iter.next();
if (map.comparator().compare(this.next, start) > 1) break;
}
this.last = null;
}
@Override
@SuppressWarnings("unchecked")
public CloneableMapIterator<E> clone(final Object modifier) {
return new CloneableMapIterator<E>(this.map, (E) modifier);
}
@Override
public boolean hasNext() {
return this.next != null;
}
@Override
public E next() {
// returns key-elements, not entry-elements
this.last = this.next;
if (this.iter.hasNext()) {
this.next = this.iter.next();
} else {
this.next = null;
}
return this.last;
}
@Override
public void remove() {
this.map.remove(this.last);
}
@Override
public void close() {
}
}
Mini Shell