org.apache.commons.jexl.parser.ASTWhileStatement Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (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.apache.org/licenses/LICENSE-2.0
*
* 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.apache.commons.jexl.parser;
import org.apache.commons.jexl.JexlContext;
import org.apache.commons.jexl.util.Coercion;
/**
* A while loop. Syntax: while ( expression ) statement
*
* @author Dion Gillard
* @since 1.1
*/
public class ASTWhileStatement extends SimpleNode {
/**
* Create the node given an id.
*
* @param id node id.
*/
public ASTWhileStatement(int id) {
super(id);
}
/**
* Create a node with the given parser and id.
*
* @param p a parser.
* @param id node id.
*/
public ASTWhileStatement(Parser p, int id) {
super(p, id);
}
/** {@inheritDoc} */
public Object jjtAccept(ParserVisitor visitor, Object data) {
return visitor.visit(this, data);
}
/** {@inheritDoc} */
public Object value(JexlContext jc) throws Exception {
Object result = null;
/* first child is the expression */
SimpleNode expressionNode = (SimpleNode) jjtGetChild(0);
while (Coercion.coerceBoolean(expressionNode.value(jc)).booleanValue()) {
// execute statement
result = ((SimpleNode) jjtGetChild(1)).value(jc);
}
return result;
}
}