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81 lines
2.3 KiB
81 lines
2.3 KiB
// kelondroCloneableMapIterator.java
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// (C) 2007 by Michael Peter Christen; mc@yacy.net, Frankfurt a. M., Germany
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// first published 25.04.2007 on http://yacy.net
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//
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// This is a part of YaCy, a peer-to-peer based web search engine
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//
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// $LastChangedDate: 2006-04-02 22:40:07 +0200 (So, 02 Apr 2006) $
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// $LastChangedRevision: 1986 $
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// $LastChangedBy: orbiter $
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//
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// LICENSE
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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package de.anomic.kelondro;
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import java.util.Iterator;
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import java.util.TreeMap;
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public class kelondroCloneableMapIterator implements kelondroCloneableIterator {
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TreeMap map;
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Object next, last;
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Object start;
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Iterator iter;
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public kelondroCloneableMapIterator(TreeMap map, Object start) {
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// map must contain eiter a byte[]/Object or a String/Object mapping.
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// start must be either of type byte[] or String
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// this iterator iterates then only the key elements of the map
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this.map = map;
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this.start = start;
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this.iter = map.keySet().iterator();
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if (this.start == null) {
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if (iter.hasNext()) this.next = iter.next(); else this.next = null;
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} else while (iter.hasNext()) {
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this.next = iter.next();
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if (map.comparator().compare(next, start) > 1) break;
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}
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this.last = null;
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}
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public Object clone(Object modifier) {
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return new kelondroCloneableMapIterator(map, modifier);
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}
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public boolean hasNext() {
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return this.next != null;
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}
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public Object next() {
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// returns key-elements, not entry-elements
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this.last = this.next;
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if (this.iter.hasNext()) {
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this.next = this.iter.next();
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} else {
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this.next = null;
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}
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return this.last;
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}
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public void remove() {
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this.map.remove(this.last);
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}
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}
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