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/*
 * The MIT License
 *
 * Copyright 2013-2014 Czech Technical University in Prague.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package cz.jirutka.rsql.parser.ast;

import cz.jirutka.rsql.parser.UnknownOperatorException;

import java.util.EnumSet;

/**
 * Built-in comparison operators.
 */
public enum ComparisonOp {

    /** Equal to... */
    EQ ("=="),

    /** Not equal to... */
    NE ("!="),

    /** Greater than... */
    GT ("=gt=", ">"),

    /** Greater than or equal to... */
    GE ("=ge=", ">="),

    /** Less than... */
    LT ("=lt=", "<"),

    /** Less than or equal to... */
    LE ("=le=", "<="),

    /** In... */
    IN ("=in="),

    /** Not in... */
    OUT ("=out=");


    private final String[] symbols;

    private ComparisonOp(String... symbols) {
        this.symbols = symbols;
    }


    public static ComparisonOp parse(String value) throws UnknownOperatorException {
        assert value != null : "value must not be null";

        for (ComparisonOp e : EnumSet.allOf(ComparisonOp.class)) {
            for (String symbol : e.symbols) {
                if (symbol.equals(value.toLowerCase())) {
                    return e;
                }
            }
        }
        throw new UnknownOperatorException(value);
    }

    @Override
    public String toString() {
        return symbols[0];
    }
}