/*
 * 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.eagle.query.parser;

public enum ComparisonOperator {
    EQUAL("="),
    LIKE("=~"),
    IN("IN"),
    NOT_IN("NOT IN"),
    LESS("<"),
    LESS_OR_EQUAL("<="),
    GREATER(">"),
    GREATER_OR_EQUAL(">="),
    NOT_EQUAL("!="),
    NOT_LIKE("!=~"),
    CONTAINS("CONTAINS"),
    NOT_CONTAINS("NOT CONTAINS"),
    IS("IS"),
    IS_NOT("IS NOT");

    private final String storedOp;
    private ComparisonOperator(String op) {
        storedOp = op;
    }

    public String toString() {
        return storedOp;
    }

    public static ComparisonOperator locateOperator(String op) {
        op = op.replaceAll("\\s+"," ");
        for (ComparisonOperator o : ComparisonOperator.values()) {
            if (op.toUpperCase().equals(o.storedOp)) {
                return o;
            }
        }
        throw new UnsupportedExpressionOperatorException(op);
    }
}