/*
* Licensed to Elastic Search and Shay Banon under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. Elastic Search 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.elasticsearch.common.settings.loader;
import org.elasticsearch.common.io.FastByteArrayInputStream;
import org.elasticsearch.common.yaml.snakeyaml.Yaml;
import java.io.IOException;
import java.util.List;
import java.util.Map;
import static org.elasticsearch.common.collect.Lists.*;
import static org.elasticsearch.common.collect.Maps.*;
/**
* Settings loader that loads (parses) the settings in a yaml format by flattening them
* into a map.
*
* @author kimchy (shay.banon)
*/
public class YamlSettingsLoader implements SettingsLoader {
@Override public Map<String, String> load(String source) throws IOException {
// replace tabs with whitespace (yaml does not accept tabs, but many users might use it still...)
source = source.replace("\t", " ");
Yaml yaml = new Yaml();
Map<Object, Object> yamlMap = (Map<Object, Object>) yaml.load(source);
StringBuilder sb = new StringBuilder();
Map<String, String> settings = newHashMap();
if (yamlMap == null) {
return settings;
}
List<String> path = newArrayList();
serializeMap(settings, sb, path, yamlMap);
return settings;
}
@Override public Map<String, String> load(byte[] source) throws IOException {
Yaml yaml = new Yaml();
Map<Object, Object> yamlMap = (Map<Object, Object>) yaml.load(new FastByteArrayInputStream(source));
StringBuilder sb = new StringBuilder();
Map<String, String> settings = newHashMap();
if (yamlMap == null) {
return settings;
}
List<String> path = newArrayList();
serializeMap(settings, sb, path, yamlMap);
return settings;
}
private void serializeMap(Map<String, String> settings, StringBuilder sb, List<String> path, Map<Object, Object> yamlMap) {
for (Map.Entry<Object, Object> entry : yamlMap.entrySet()) {
if (entry.getValue() instanceof Map) {
path.add((String) entry.getKey());
serializeMap(settings, sb, path, (Map<Object, Object>) entry.getValue());
path.remove(path.size() - 1);
} else if (entry.getValue() instanceof List) {
path.add((String) entry.getKey());
serializeList(settings, sb, path, (List) entry.getValue());
path.remove(path.size() - 1);
} else {
serializeValue(settings, sb, path, (String) entry.getKey(), entry.getValue());
}
}
}
private void serializeList(Map<String, String> settings, StringBuilder sb, List<String> path, List yamlList) {
int counter = 0;
for (Object listEle : yamlList) {
if (listEle instanceof Map) {
path.add(Integer.toString(counter));
serializeMap(settings, sb, path, (Map<Object, Object>) listEle);
path.remove(path.size() - 1);
} else if (listEle instanceof List) {
path.add(Integer.toString(counter));
serializeList(settings, sb, path, (List) listEle);
path.remove(path.size() - 1);
} else {
serializeValue(settings, sb, path, Integer.toString(counter), listEle);
}
counter++;
}
}
private void serializeValue(Map<String, String> settings, StringBuilder sb, List<String> path, String name, Object value) {
if (value == null) {
return;
}
sb.setLength(0);
for (String pathEle : path) {
sb.append(pathEle).append('.');
}
sb.append(name);
settings.put(sb.toString(), value.toString());
}
}