/**
* 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.engine.eval;
import java.util.regex.Pattern;
import java.util.regex.PatternSyntaxException;
public class SimilarToPredicateEval extends PatternMatchPredicateEval {
private static final String SIMILARTO_ESCAPE_SPATIAL_CHARACTERS = "([.])";
public SimilarToPredicateEval(boolean not, EvalNode field, ConstEval pattern) {
super(EvalType.SIMILAR_TO, not, field, pattern);
}
@Override
protected void compile(String pattern) throws PatternSyntaxException {
String regex = pattern.replaceAll(SIMILARTO_ESCAPE_SPATIAL_CHARACTERS, "\\\\$1");
regex = regex.replace("_", ".").replace("%", ".*"); // transform some special characters to be 'like'.
this.compiled = Pattern.compile(regex, Pattern.DOTALL);
}
@Override
public String toString() {
return leftExpr.toString() + " SIMILAR TO '" + pattern + "'";
}
}