/**
* 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.tajo.plan.expr;
import org.apache.tajo.util.StringUtils;
import java.util.regex.Pattern;
import java.util.regex.PatternSyntaxException;
public class LikePredicateEval extends PatternMatchPredicateEval {
public LikePredicateEval(boolean not, EvalNode field, ConstEval pattern) {
super(EvalType.LIKE, not, field, pattern, false);
}
public LikePredicateEval(boolean not, EvalNode field, ConstEval pattern, boolean caseSensitive) {
super(EvalType.LIKE, not, field, pattern, caseSensitive);
}
protected void compile(String pattern) throws PatternSyntaxException {
String escaped = StringUtils.escapeRegexp(pattern);
String regex = escaped.replace("_", ".").replace("%", ".*");
int flags = Pattern.DOTALL;
if (caseInsensitive) {
flags |= Pattern.CASE_INSENSITIVE;
}
this.compiled = Pattern.compile(regex, flags);
}
public boolean isLeadingWildCard() {
return pattern.indexOf(".*") == 0;
}
@Override
public String toString() {
return leftExpr.toString() + (caseInsensitive ? "ILIKE" : "LIKE") + "'" + pattern +"'";
}
}