io.jenkins.updatebot.support.Systems Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of updatebot-core Show documentation
There is a newer version: 1.1.7
/*
 * Copyright 2016 Red Hat, Inc.
 *
 * Red Hat 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 io.jenkins.updatebot.support;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 */
public class Systems {
    private static final transient Logger LOG = LoggerFactory.getLogger(Systems.class);

    public static String getConfigValue(String envVar) {
        return getConfigValue(envVar, null);
    }

    /**
     * Returns the value of the given environment variable as a system property or environment variable or returns the default value
     */
    public static String getConfigValue(String envVar, String defaultValue) {
        String systemProperty = envVar.toLowerCase().replace('_', '.');
        String answer = System.getProperty(systemProperty);
        if (Strings.notEmpty(answer)) {
            return answer;
        }
        try {
            answer = System.getenv(envVar);
        } catch (Exception e) {
            LOG.warn("Failed to look up environment variable $" + envVar + ". " + e, e);
        }
        if (Strings.notEmpty(answer)) {
            return answer;
        } else {
            return defaultValue;
        }
    }


    public static long getConfigLongValue(String envVar, long defaultValue) {
        String value = getConfigValue(envVar, "").trim();
        if (value.isEmpty()) {
            return defaultValue;
        }
        try {
            return Long.parseLong(value);
        } catch (NumberFormatException e) {
            LOG.warn("Failed to parse environment variable: " + envVar + " long value: " + value + ": " + e, e);
            return defaultValue;
        }
    }




    /**
     * Returns true if the env var or system property is "true"
     */
    public static boolean isConfigFlag(String envVar) {
        String value = getConfigValue(envVar);
        return value != null && value.equalsIgnoreCase("true");
    }

    /**
     * Returns value of the env var or system property if set, otherwise the specified default value
     * Different from a flag as a flag is always false if not present
     */
    public static boolean isConfigBoolean(String envVar, boolean defaultValue) {
        String value = getConfigValue(envVar);
        if( value != null ){
            return Boolean.parseBoolean(envVar);
        }
        return defaultValue;
    }
}