org.apache.commons.jexl.parser.ASTAssignment 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;
/**
* x = y, assigns a value to a variable in the context.
*
* @author Dion Gillard
*
*/
public class ASTAssignment extends SimpleNode {
/**
* Create the node given an id.
*
* @param id node id.
*/
public ASTAssignment(int id) {
super(id);
}
/**
* Create a node with the given parser and id.
*
* @param p a parser.
* @param id node id.
*/
public ASTAssignment(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 context) throws Exception {
// left should be the variable (reference) to assign to
SimpleNode left = (SimpleNode) jjtGetChild(0);
// right should be the expression to evaluate
Object right = ((SimpleNode) jjtGetChild(1)).value(context);
if (left instanceof ASTReference) {
ASTReference reference = (ASTReference) left;
left = (SimpleNode) reference.jjtGetChild(0);
if (left instanceof ASTIdentifier) {
String identifier = ((ASTIdentifier) left)
.getIdentifierString();
context.getVars().put(identifier, right);
}
}
return right;
}
}