/*
* Copyright (c) 2014 Hewlett-Packard Development Company, L.P.
*
* 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.
*/
package monasca.common.util.config;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ArrayNode;
import com.fasterxml.jackson.databind.node.ValueNode;
import com.google.common.base.Joiner;
public final class Configurations {
private static final Joiner DOT_JOINER = Joiner.on(".");
private Configurations() {
}
public static Map<String, String> configFor(String keyPrefix, Object source) {
Map<String, String> config = new HashMap<String, String>();
buildConfigFor(keyPrefix, config, new ObjectMapper().valueToTree(source));
return config;
}
private static void buildConfigFor(String path, Map<String, String> config, JsonNode node) {
for (Iterator<Map.Entry<String, JsonNode>> i = node.fields(); i.hasNext();) {
Map.Entry<String, JsonNode> field = i.next();
if (field.getValue() instanceof ValueNode) {
ValueNode valueNode = (ValueNode) field.getValue();
config.put(DOT_JOINER.join(path, field.getKey()), valueNode.asText());
} else if (field.getValue() instanceof ArrayNode) {
StringBuilder combinedValue = new StringBuilder();
ArrayNode arrayNode = (ArrayNode) field.getValue();
for (Iterator<JsonNode> it = arrayNode.elements(); it.hasNext();) {
String value = it.next().asText().replaceAll("^\"|\"$", "");
if (combinedValue.length() > 0)
combinedValue.append(',');
combinedValue.append(value);
}
config.put(DOT_JOINER.join(path, field.getKey()), combinedValue.toString());
}
buildConfigFor(DOT_JOINER.join(path, field.getKey()), config, field.getValue());
}
}
}