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- /*--
-
- $Id: FilterIterator.java,v 1.6 2007/11/10 05:28:59 jhunter Exp $
-
- Copyright (C) 2000-2007 Jason Hunter & Brett McLaughlin.
- All rights reserved.
-
- Redistribution and use in source and binary forms, with or without
- modification, are permitted provided that the following conditions
- are met:
-
- 1. Redistributions of source code must retain the above copyright
- notice, this list of conditions, and the following disclaimer.
-
- 2. Redistributions in binary form must reproduce the above copyright
- notice, this list of conditions, and the disclaimer that follows
- these conditions in the documentation and/or other materials
- provided with the distribution.
-
- 3. The name "JDOM" must not be used to endorse or promote products
- derived from this software without prior written permission. For
- written permission, please contact <request_AT_jdom_DOT_org>.
-
- 4. Products derived from this software may not be called "JDOM", nor
- may "JDOM" appear in their name, without prior written permission
- from the JDOM Project Management <request_AT_jdom_DOT_org>.
-
- In addition, we request (but do not require) that you include in the
- end-user documentation provided with the redistribution and/or in the
- software itself an acknowledgement equivalent to the following:
- "This product includes software developed by the
- JDOM Project (http://www.jdom.org/)."
- Alternatively, the acknowledgment may be graphical using the logos
- available at http://www.jdom.org/images/logos.
-
- THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
- WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- DISCLAIMED. IN NO EVENT SHALL THE JDOM AUTHORS OR THE PROJECT
- CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
- USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
- OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- SUCH DAMAGE.
-
- This software consists of voluntary contributions made by many
- individuals on behalf of the JDOM Project and was originally
- created by Jason Hunter <jhunter_AT_jdom_DOT_org> and
- Brett McLaughlin <brett_AT_jdom_DOT_org>. For more information
- on the JDOM Project, please see <http://www.jdom.org/>.
-
- */
-
- package org.jdom;
-
- import java.util.*;
- import org.jdom.filter.*;
-
- /**
- * Traverse a parent's children that match the supplied filter.
- *
- * @author Bradley S. Huffman
- * @version $Revision: 1.6 $, $Date: 2007/11/10 05:28:59 $
- */
- class FilterIterator implements Iterator {
-
- private Iterator iterator;
- private Filter filter;
- private Object nextObject;
-
- private static final String CVS_ID =
- "@(#) $RCSfile: FilterIterator.java,v $ $Revision: 1.6 $ $Date: 2007/11/10 05:28:59 $ $Name: jdom_1_1 $";
-
- public FilterIterator(Iterator iterator, Filter filter) {
- if ((iterator == null) || (filter == null)) {
- throw new IllegalArgumentException("null parameter");
- }
- this.iterator = iterator;
- this.filter = filter;
- }
-
- public boolean hasNext() {
- if (nextObject != null) {
- return true;
- }
-
- while (iterator.hasNext()) {
- Object obj = iterator.next();
- if (filter.matches(obj)) {
- nextObject = obj;
- return true;
- }
- }
- return false;
- }
-
- public Object next() {
- if (!hasNext()) {
- throw new NoSuchElementException();
- }
-
- Object obj = nextObject;
- nextObject = null;
- return obj;
- }
-
- public void remove() {
- // XXX Could cause probs for sure if hasNext() is
- // called before the remove(), although that's unlikely.
- iterator.remove();
- }
- }
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