org.elasticsearch.hadoop.cfg.SettingsView Maven / Gradle / Ivy
/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.hadoop.cfg;
import java.io.InputStream;
import java.util.Properties;
/**
* Provides a limited view over the given settings object.
*/
class SettingsView extends Settings {
private final Settings parent;
private final String namespace;
SettingsView(Settings parent, String namespace) {
this.parent = parent;
this.namespace = namespace;
}
private String makeKey(String name) {
return namespace + "." + name;
}
@Override
public InputStream loadResource(String location) {
throw new UnsupportedOperationException("Settings views do not support loading resources.");
}
@Override
public Settings copy() {
return new SettingsView(parent.copy(), namespace);
}
@Override
public String getProperty(String name) {
return parent.getProperty(makeKey(name));
}
@Override
public void setProperty(String name, String value) {
parent.setProperty(makeKey(name), value);
}
@Override
public Properties asProperties() {
Properties parentSettings = parent.asProperties();
Properties viewProperties = new Properties();
String prefix = namespace + ".";
for (Object keyObject : parentSettings.keySet()) {
String key = keyObject.toString();
if (key.startsWith(prefix) && !key.equals(prefix)) {
String newKey = key.substring(prefix.length());
viewProperties.put(newKey, parentSettings.getProperty(key));
}
}
return viewProperties;
}
}