com.hpcloud.mon.common.model.alarm.AlarmOperator.java Source code

Introduction

Here is the source code for com.hpcloud.mon.common.model.alarm.AlarmOperator.java

Source

/*
 * Copyright (c) 2014 Hewlett-Packard Development Company, L.P.
 *
 * Licensed 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 com.hpcloud.mon.common.model.alarm;

import com.fasterxml.jackson.annotation.JsonCreator;

/**
 * Alarm operator.
 */
public enum AlarmOperator {
    LT("<"), LTE("<="), GT(">"), GTE(">=");

    private final String operatorSymbols;

    private AlarmOperator(String operatorSymbols) {
        this.operatorSymbols = operatorSymbols;
    }

    @JsonCreator
    public static AlarmOperator fromJson(String text) {
        return valueOf(text.toUpperCase());
    }

    public static AlarmOperator reverseOperator(AlarmOperator op) {
        if (op == LT)
            return GT;
        if (op == GT)
            return LT;
        if (op == LTE)
            return GTE;
        return LTE;
    }

    public boolean evaluate(double lhs, double rhs) {
        switch (this) {
        case LT:
            return lhs < rhs;
        case LTE:
            return lhs <= rhs;
        case GT:
            return lhs > rhs;
        case GTE:
            return lhs >= rhs;
        default:
            return false;
        }
    }

    @Override
    public String toString() {
        return operatorSymbols;
    }
}