/*
* Copyright 2012 PRODYNA AG
*
* Licensed under the Eclipse Public License (EPL), Version 1.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.opensource.org/licenses/eclipse-1.0.php or
* http://www.nabucco.org/License.html
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.nabucco.framework.generator.parser.syntaxtree;
/**
* Represents an grammar optional node, e.g. ( A )? or [ A ]
*/
public class NodeOptional implements Node {
public NodeOptional() {
node = null;
}
public NodeOptional(Node n) {
addNode(n);
}
public void addNode(Node n) {
if ( node != null) // Oh oh!
throw new Error("Attempt to set optional node twice");
node = n;
n.setParent(this);
}
public void accept(org.nabucco.framework.generator.parser.visitor.Visitor v) {
v.visit(this);
}
public <R,A> R accept(org.nabucco.framework.generator.parser.visitor.GJVisitor<R,A> v, A argu) {
return v.visit(this,argu);
}
public <R> R accept(org.nabucco.framework.generator.parser.visitor.GJNoArguVisitor<R> v) {
return v.visit(this);
}
public <A> void accept(org.nabucco.framework.generator.parser.visitor.GJVoidVisitor<A> v, A argu) {
v.visit(this,argu);
}
public boolean present() { return node != null; }
public void setParent(Node n) { parent = n; }
public Node getParent() { return parent; }
private Node parent;
public Node node;
}