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package com.diozero.util;
/*
* #%L
* Organisation: diozero
* Project: diozero - Core
* Filename: PropertyUtil.java
*
* This file is part of the diozero project. More information about this project
* can be found at https://www.diozero.com/.
* %%
* Copyright (C) 2016 - 2021 diozero
* %%
* 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.
* #L%
*/
import java.util.Optional;
import java.util.HashMap;
import java.util.Map;
import org.tinylog.Logger;
/**
* Access properties that are set either via command line "-D" parameters or as
* environment variables. Command line parameters take precedence over
* environment variables.
*/
public class PropertyUtil {
private static final Map envProps;
static {
envProps = new HashMap<>();
System.getenv().entrySet().forEach(entry -> {
envProps.put(entry.getKey(), entry.getValue());
// Additionally convert '_' to '.' as the shell export command doesn't allow '.'
if (entry.getKey().contains("_")) {
envProps.put(entry.getKey().replace('_', '.'), entry.getValue());
}
});
}
public static boolean isPropertySet(String key) {
return getProperty(key).isPresent();
}
public static long getLongProperty(String key, long defaultValue) {
return getLongProperty(key).orElse(Long.valueOf(defaultValue)).longValue();
}
public static Optional getLongProperty(String key) {
Optional result = Optional.empty();
String val = getProperty(key, null);
if (val != null) {
try {
result = Optional.of(Long.valueOf(val));
} catch (NumberFormatException e) {
// Ignore and leave as empty
Logger.warn(e, "Error parsing '" + val + "' as Long", e);
}
}
return result;
}
public static int getIntProperty(String key, int defaultValue) {
return getIntProperty(key).orElse(Integer.valueOf(defaultValue)).intValue();
}
public static Optional getIntProperty(String key) {
Optional result = Optional.empty();
String val = getProperty(key, null);
if (val != null) {
try {
result = Optional.of(Integer.valueOf(val));
} catch (NumberFormatException e) {
// Ignore and leave as empty
Logger.warn(e, "Error parsing '" + val + "' as Integer", e);
}
}
return result;
}
public static Optional getBooleanProperty(String key) {
Optional result = Optional.empty();
String val = getProperty(key, null);
if (val != null) {
result = Optional.of(Boolean.valueOf(val));
}
return result;
}
public static float getFloatProperty(String key, float defaultValue) {
return getFloatProperty(key).orElse(Float.valueOf(defaultValue)).floatValue();
}
public static Optional getFloatProperty(String key) {
Optional result = Optional.empty();
String val = getProperty(key, null);
if (val != null) {
try {
result = Optional.of(Float.valueOf(val));
} catch (NumberFormatException e) {
// Ignore and leave as empty
Logger.warn(e, "Error parsing '" + val + "' as Float", e);
}
}
return result;
}
public static double getDoubleProperty(String key, double defaultValue) {
return getDoubleProperty(key).orElse(Double.valueOf(defaultValue)).doubleValue();
}
public static Optional getDoubleProperty(String key) {
Optional result = Optional.empty();
String val = getProperty(key, null);
if (val != null) {
try {
result = Optional.of(Double.valueOf(val));
} catch (NumberFormatException e) {
// Ignore and leave as empty
Logger.warn(e, "Error parsing '" + val + "' as Double", e);
}
}
return result;
}
public static boolean getBooleanProperty(String key, boolean defaultValue) {
return getBooleanProperty(key).orElse(Boolean.valueOf(defaultValue)).booleanValue();
}
public static Optional getProperty(String key) {
// System properties (-D) take priority over environment variables
// Java 9 has Optional.or():
/*-
return Optional.ofNullable(System.getProperties().getProperty(key, envProps.get(key)))
.or(Optional::empty);
*/
String value = System.getProperties().getProperty(key, envProps.get(key));
return value == null ? Optional.empty() : Optional.of(value);
}
public static String getProperty(String key, String defaultValue) {
return getProperty(key).orElse(defaultValue);
}
}
