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/*
* ============LICENSE_START=======================================================
* ONAP
* ================================================================================
* Copyright (C) 2017-2019 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* 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.
* ============LICENSE_END=========================================================
*/
package org.onap.policy.drools.utils;
import com.google.common.base.Splitter;
import java.util.List;
import org.apache.commons.configuration2.interpol.Lookup;
import org.apache.commons.lang3.StringUtils;
/**
* Environment Variable with a default value. The syntax is
* ${envd:variable-name:default-value}.
*/
public class EnvironmentVariableWithDefaultLookup implements Lookup {
@Override
public String lookup(String key) {
if (StringUtils.isBlank(key)) {
return null;
}
List<String> envWithDefault =
Splitter.on(":").trimResults().omitEmptyStrings().splitToList(key);
if (envWithDefault.isEmpty()) {
return StringUtils.EMPTY;
}
String envVar = System.getenv(envWithDefault.get(0));
if (StringUtils.isNotEmpty(envVar)) {
return envVar;
}
if (envWithDefault.size() > 1) {
return String.join(":", envWithDefault.subList(1, envWithDefault.size()));
}
return StringUtils.EMPTY;
}
}
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