/**
* 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 com.google.gson.annotations.Expose;
import org.apache.tajo.catalog.Schema;
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 org.apache.tajo.type.Type;
import java.util.regex.Pattern;
import java.util.regex.PatternSyntaxException;
public abstract class PatternMatchPredicateEval extends BinaryEval {
@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;
public boolean isNot() {
return not;
}
public boolean isCaseInsensitive() {
return caseInsensitive;
}
@Override
public Type getValueType() {
return Type.Bool;
}
@Override
public String getName() {
return "?";
}
@Override
public EvalNode bind(EvalContext evalContext, Schema schema) {
super.bind(evalContext, schema);
compile(pattern);
return this;
}
@Override
public Datum eval(Tuple tuple) {
if (!isBound) {
throw new IllegalStateException("bind() must be called before eval()");
}
Datum predicand = leftExpr.eval(tuple);
if (predicand.isNull()) {
return NullDatum.get();
}
boolean matched = compiled.matcher(predicand.asChars()).matches();
return DatumFactory.createBool(matched ^ not);
}
}