/*
* Licensed to CRATE Technology GmbH ("Crate") under one or more contributor
* license agreements. See the NOTICE file distributed with this work for
* additional information regarding copyright ownership. Crate 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.
*
* However, if you have executed another commercial license agreement
* with Crate these terms will supersede the license and you may use the
* software solely pursuant to the terms of the relevant commercial agreement.
*/
package io.crate.operation.operator;
import io.crate.metadata.FunctionInfo;
import io.crate.operation.Input;
import io.crate.planner.symbol.Function;
import io.crate.planner.symbol.Literal;
import io.crate.planner.symbol.Symbol;
import io.crate.types.DataTypes;
import org.apache.lucene.util.BytesRef;
import org.apache.lucene.util.automaton.ByteRunAutomaton;
import org.apache.lucene.util.automaton.RegExp;
public class RegexpMatchOperator extends Operator<BytesRef> {
public static final String NAME = "op_~";
public static final FunctionInfo INFO = generateInfo(NAME, DataTypes.STRING);
public static void register(OperatorModule module) {
module.registerOperatorFunction(new RegexpMatchOperator());
}
@Override
public Boolean evaluate(Input<BytesRef>... args) {
assert args.length == 2 : "invalid number of arguments";
BytesRef source = args[0].value();
if (source == null) {
return null;
}
BytesRef pattern = args[1].value();
if (pattern == null) {
return null;
}
RegExp regexp = new RegExp(pattern.utf8ToString());
ByteRunAutomaton regexpRunAutomaton = new ByteRunAutomaton(regexp.toAutomaton());
return regexpRunAutomaton.run(source.bytes, source.offset, source.length);
}
@Override
public FunctionInfo info() {
return INFO;
}
@Override
public Symbol normalizeSymbol(Function symbol) {
assert (symbol != null);
assert symbol.arguments().size() == 2;
Symbol sourceSymbol = symbol.arguments().get(0);
Symbol patternSymbol = symbol.arguments().get(1);
if (containsNull(sourceSymbol, patternSymbol)) {
return Literal.NULL;
}
if (!sourceSymbol.symbolType().isValueSymbol() || !patternSymbol.symbolType().isValueSymbol()) {
return symbol;
}
return Literal.newLiteral(evaluate((Literal) sourceSymbol, (Literal) patternSymbol));
}
}