/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF 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 org.apache.isis.core.commons.configbuilder;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import com.google.common.base.Joiner;
import com.google.common.base.Splitter;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;
public class PrimerForEnvironmentVariableISIS_OPTS implements IsisConfigurationBuilder.Primer {
public static final String OPT_ENV = "ISIS_OPTS";
public static final String SEPARATOR_ENV = "ISIS_OPTS_SEPARATOR";
public static final String SEPARATOR_DEFAULT = "||";
@Override
public void prime(final IsisConfigurationBuilder builder) {
final String separator = determineSeparator();
final String optEnv = OPT_ENV;
final String env = getEnv(optEnv);
for (Map.Entry<String, String> entry : fromEnv(env, separator).entrySet()) {
final String envVarName = entry.getKey();
final String envVarValue = entry.getValue();
builder.put(envVarName, envVarValue);
}
}
/**
* Factored out for testing
*/
String getEnv(final String optEnv) {
return System.getenv(optEnv);
}
private String determineSeparator() {
final String separator = getEnv(SEPARATOR_ENV);
if (separator != null) {
return separator;
}
return SEPARATOR_DEFAULT;
}
private static Map<String, String> fromEnv(final String env, final String separator) {
final LinkedHashMap<String, String> map = Maps.newLinkedHashMap();
if (env != null) {
final List<String> keyAndValues = Splitter.on(separator).splitToList(env);
for (String keyAndValue : keyAndValues) {
final List<String> parts = Lists.newArrayList(Splitter.on("=").splitToList(keyAndValue));
if (parts.size() >= 2) {
String key = parts.get(0);
parts.remove(0);
final String value = Joiner.on("=").join(parts);
map.put(key, value);
}
}
}
return map;
}
}