/*
* Copyright 2013 Future Systems
*
* Licensed 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.araqne.logdb.query.expr;
import org.araqne.logdb.Row;
import org.araqne.logdb.ObjectComparator;
import org.araqne.logdb.query.expr.In.StringMatcher;
public class Neq extends BinaryExpression {
private ObjectComparator cmp = new ObjectComparator();
private StringMatcher matcher;
public Neq(Expression lhs, Expression rhs) {
super(lhs, rhs);
if (rhs instanceof StringConstant) {
String needle = (String) rhs.eval(null);
matcher = new StringMatcher(needle);
}
}
@Override
public Object eval(Row row) {
Object l = lhs.eval(row);
if (l == null)
return false;
if (matcher != null) {
return !matcher.match(row, l.toString());
} else {
Object r = rhs.eval(row);
if (r == null)
return false;
return cmp.compare(l, r) != 0;
}
}
@Override
public String toString() {
return "(" + lhs + " != " + rhs + ")";
}
}