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/*
 Copyright 2013 Red Hat, Inc. and/or its affiliates.

 This file is part of lightblue.

 This program is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation, either version 3 of the License, or
 (at your option) any later version.

 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with this program.  If not, see .
 */
package com.redhat.lightblue.query;

/**
 * Unary logical operators (not)
 */
public enum UnaryLogicalOperator {
    _not;

    /**
     * Applies the operator to a value
     *
     * @param value The value to which the operator is to be applied
     *
     * @return Returns op(value). For _not, returns !value.
     */
    public boolean apply(boolean value) {
        return !value;
    }

    public String toString() {
        return "$not";
    }

    public static UnaryLogicalOperator fromString(String s) {
        return "$not".equals(s) ? _not : null;
    }
}