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/*-
* ============LICENSE_START=======================================================
* onap
* ================================================================================
* Copyright (C) 2016 - 2017 ONAP
* ================================================================================
* 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.ccsdk.sli.core.utils;
import com.google.common.base.Strings;
import java.io.File;
import java.nio.file.Paths;
import java.util.Optional;
/**
* Resolves dblib properties files relative to the directory identified by the <code>SDNC_CONFIG_DIR</code>
* environment variable.
*/
public abstract class EnvVarFileResolver implements PropertiesFileResolver {
/**
* Key for environment variable representing the configuration directory
*/
private final String propertyKey;
private final String successMessage;
public EnvVarFileResolver(final String successMessage, final String propertyKey) {
this.successMessage = successMessage;
this.propertyKey = propertyKey;
}
/**
* Parse a properties file location based on System environment variable
*
* @return an Optional File containing the location if it exists, or an empty Optional
*/
@Override
public Optional<File> resolveFile(final String filename) {
// attempt to resolve the property directory from the corresponding environment variable
final String propDirectoryFromEnvVariable = System.getenv(propertyKey);
final File fileFromEnvVariable;
if (!Strings.isNullOrEmpty(propDirectoryFromEnvVariable)) {
fileFromEnvVariable = Paths.get(propDirectoryFromEnvVariable).resolve(filename).toFile();
if(fileFromEnvVariable.exists()) {
return Optional.of(fileFromEnvVariable);
}
}
return Optional.empty();
}
@Override
public String getSuccessfulResolutionMessage() {
return this.successMessage;
}
}
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