org.apache.tajo.plan.expr.RegexPredicateEval.java Source code

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Here is the source code for org.apache.tajo.plan.expr.RegexPredicateEval.java

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/**
 * 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.commons.lang.StringEscapeUtils;

import java.util.regex.Pattern;
import java.util.regex.PatternSyntaxException;

public class RegexPredicateEval extends PatternMatchPredicateEval {
    @Expose
    private String operator;

    public RegexPredicateEval(boolean not, EvalNode field, ConstEval pattern, boolean caseInsensitive) {
        super(EvalType.REGEX, not, field, pattern, caseInsensitive);
        StringBuilder sb = new StringBuilder();
        if (not) {
            sb.append("!");
        }
        sb.append("~");
        if (caseInsensitive) {
            sb.append("*");
        }
        this.operator = sb.toString();
    }

    protected void compile(String regex) throws PatternSyntaxException {
        int flags = Pattern.DOTALL;
        if (caseInsensitive) {
            flags |= Pattern.CASE_INSENSITIVE;
        }
        this.compiled = Pattern.compile(StringEscapeUtils.unescapeJava(regex), flags);
    }

    @Override
    public String toString() {
        return leftExpr.toString() + operator + "'" + pattern + "'";
    }
}