org.apache.commons.jexl.parser.ASTIdentifier 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;
/**
* Simple identifier - $foo or $foo.bar (both parts are identifiers).
*
* @author Geir Magnusson Jr.
* @version $Id: ASTIdentifier.java 548229 2007-06-18 06:11:32Z dion $
*/
public class ASTIdentifier extends SimpleNode {
/** the name of the variable. */
protected String val;
/**
* Create the node given an id.
*
* @param id node id.
*/
public ASTIdentifier(int id) {
super(id);
}
/**
* Create a node with the given parser and id.
*
* @param p a parser.
* @param id node id.
*/
public ASTIdentifier(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 {
return jc.getVars().get(val);
}
/**
* returns the value of itself applied to the object. We assume that an
* identifier can be gotten via a get(String).
* e.g. if we have bean.property, 'property' has been parsed as an identifier,
* and we need to resolve the expression by calling the property getter.
*
* @param obj the object to evaluate against.
* @param jc the {@link JexlContext}.
* @throws Exception on any error.
* @return the resulting value.
* @see ASTArrayAccess#evaluateExpr(Object, Object, Uberspect)
*/
public Object execute(Object obj, JexlContext jc) throws Exception {
return ASTArrayAccess.evaluateExpr(obj, val, getUberspect());
}
/**
* Gets the name of the variable.
* @return the variable name.
*/
public String getIdentifierString() {
return val;
}
}