com.msiops.garage.configuration.Configuration Maven / Gradle / Ivy
/**
* Licensed to Media Science International (MSI) under one or more
* contributor license agreements. See the NOTICE file distributed with this
* work for additional information regarding copyright ownership. MSI
* 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 com.msiops.garage.configuration;
import java.io.InputStream;
import java.util.Collection;
import java.util.Properties;
public interface Configuration {
static final String ENVIRONMENT_PROPERTY = "garage.environment";
static Properties of(final Class key) {
return of(key, new Properties());
}
static Properties of(final Class key, final Properties defaults) {
final String env = System.getProperty(ENVIRONMENT_PROPERTY,
"development");
try (InputStream is = key.getResourceAsStream(env + ".properties")) {
final Properties rval = new Properties(defaults);
rval.load(is);
return rval;
} catch (final Exception e) {
return new Properties(defaults);
}
}
static Properties override(final Properties properties,
final Collection from) {
final Properties rval = new Properties(properties);
from.forEach(k -> {
final String ovr = System.getProperty(k);
if (ovr != null) {
rval.setProperty(k, ovr);
}
});
return rval;
}
}