com.sun.tools.rngom.digested.DContainerPattern Maven / Gradle / Ivy
/*
* Copyright (C) 2004-2011
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package com.sun.tools.rngom.digested;
import java.util.Iterator;
/**
* A pattern that can contain other patterns.
*
* @author Kohsuke Kawaguchi ([email protected])
*/
public abstract class DContainerPattern extends DPattern implements Iterable {
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 iterator() {
return new Iterator<>() {
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;
}
}
}