org.apache.commons.jexl.parser.ASTEQNode 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;
/**
* Represents equality between values.
*
* If the values are of the same class, .equals() is used.
*
* If either value is a {@link Float} or {@link Double} (but both are not the same class),
* the values are coerced to {@link Double}s before comparing.
*
* If either value is a {@link Number} or {@link Character} (but both are not the same class),
* the values are coerced to {@link Long}s before comparing.
*
* If either value is a {@link Boolean} (but both are not the same class),
* the values are coerced to {@link Boolean}s before comparing.
*
* If either value is a {@link String} (but both are not the same class),
* toString() is called on both before comparing.
*
* Otherwise left.equals(right) is returned.
*
* @author Geir Magnusson Jr.
* @version $Id: ASTEQNode.java 480412 2006-11-29 05:11:23Z bayard $
*/
public class ASTEQNode extends SimpleNode {
/**
* Create the node given an id.
*
* @param id node id.
*/
public ASTEQNode(int id) {
super(id);
}
/**
* Create a node with the given parser and id.
*
* @param p a parser.
* @param id node id.
*/
public ASTEQNode(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 pc) throws Exception {
Object left = ((SimpleNode) jjtGetChild(0)).value(pc);
Object right = ((SimpleNode) jjtGetChild(1)).value(pc);
if (left == null && right == null) {
/*
* if both are null L == R
*/
return Boolean.TRUE;
} else if (left == null || right == null) {
/*
* we know both aren't null, therefore L != R
*/
return Boolean.FALSE;
} else if (left.getClass().equals(right.getClass())) {
return left.equals(right) ? Boolean.TRUE : Boolean.FALSE;
} else if (left instanceof Float || left instanceof Double
|| right instanceof Float || right instanceof Double) {
Double l = Coercion.coerceDouble(left);
Double r = Coercion.coerceDouble(right);
return l.equals(r) ? Boolean.TRUE : Boolean.FALSE;
} else if (left instanceof Number || right instanceof Number
|| left instanceof Character || right instanceof Character) {
return Coercion.coerceLong(left).equals(Coercion.coerceLong(right)) ? Boolean.TRUE
: Boolean.FALSE;
} else if (left instanceof Boolean || right instanceof Boolean) {
return Coercion.coerceBoolean(left).equals(
Coercion.coerceBoolean(right)) ? Boolean.TRUE
: Boolean.FALSE;
} else if (left instanceof java.lang.String || right instanceof String) {
return left.toString().equals(right.toString()) ? Boolean.TRUE
: Boolean.FALSE;
}
return left.equals(right) ? Boolean.TRUE : Boolean.FALSE;
}
}