| /* |
| * Copyright 2006 Sun Microsystems, Inc. All Rights Reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Sun designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Sun in the LICENSE file that accompanied this code. |
| * |
| * This code 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 |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| * CA 95054 USA or visit www.sun.com if you need additional information or |
| * have any questions. |
| */ |
| |
| package com.sun.xml.internal.rngom.digested; |
| |
| import java.util.Iterator; |
| |
| |
| /** |
| * A pattern that can contain other patterns. |
| * |
| * @author Kohsuke Kawaguchi (kk@kohsuke.org) |
| */ |
| public abstract class DContainerPattern extends DPattern implements Iterable<DPattern> { |
| private DPattern head; |
| private DPattern tail; |
| |
| public DPattern firstChild() { |
| return head; |
| } |
| |
| public DPattern lastChild() { |
| return tail; |
| } |
| |
| public int countChildren() { |
| int i=0; |
| for( DPattern p=firstChild(); p!=null; p=p.next) |
| i++; |
| return i; |
| } |
| |
| public Iterator<DPattern> iterator() { |
| return new Iterator<DPattern>() { |
| DPattern next = head; |
| public boolean hasNext() { |
| return next!=null; |
| } |
| |
| public DPattern next() { |
| DPattern r = next; |
| next = next.next; |
| return r; |
| } |
| |
| public void remove() { |
| throw new UnsupportedOperationException(); |
| } |
| }; |
| } |
| |
| void add( DPattern child ) { |
| if(tail==null) { |
| child.prev = child.next = null; |
| head = tail = child; |
| } else { |
| child.prev = tail; |
| tail.next = child; |
| child.next = null; |
| tail = child; |
| } |
| } |
| } |