/**
* 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 com.google.gson.annotations.Expose;
import org.apache.tajo.catalog.CatalogUtil;
import org.apache.tajo.catalog.Schema;
import org.apache.tajo.common.TajoDataTypes;
import org.apache.tajo.common.TajoDataTypes.DataType;
import org.apache.tajo.datum.Datum;
import org.apache.tajo.datum.DatumFactory;
import org.apache.tajo.datum.NullDatum;
import org.apache.tajo.storage.Tuple;
import java.util.regex.Pattern;
import java.util.regex.PatternSyntaxException;
public abstract class PatternMatchPredicateEval extends BinaryEval {
private static final DataType RES_TYPE = CatalogUtil.newSimpleDataType(TajoDataTypes.Type.BOOLEAN);
@Expose protected boolean not;
@Expose protected String pattern;
@Expose protected boolean caseInsensitive;
// transient variables
protected Pattern compiled;
public PatternMatchPredicateEval(EvalType evalType, boolean not, EvalNode predicand, ConstEval pattern,
boolean caseInsensitive) {
super(evalType, predicand, pattern);
this.not = not;
this.pattern = pattern.getValue().asChars();
this.caseInsensitive = caseInsensitive;
}
public PatternMatchPredicateEval(EvalType evalType, boolean not, EvalNode field, ConstEval pattern) {
this(evalType, not, field, pattern, false);
}
abstract void compile(String pattern) throws PatternSyntaxException;
@Override
public DataType getValueType() {
return RES_TYPE;
}
@Override
public String getName() {
return "?";
}
@Override
public Datum eval(Schema schema, Tuple tuple) {
if (this.compiled == null) {
compile(this.pattern);
}
Datum predicand = leftExpr.eval(schema, tuple);
if (predicand.isNull()) {
return NullDatum.get();
}
boolean matched = compiled.matcher(predicand.asChars()).matches();
return DatumFactory.createBool(matched ^ not);
}
}