/**
* Copyright (c) 2014-2017 by the respective copyright holders.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*/
package org.eclipse.smarthome.io.rest.core.config;
import java.io.IOException;
import java.util.Collection;
import java.util.Dictionary;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Hashtable;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import org.eclipse.smarthome.config.core.Configuration;
import org.osgi.framework.Constants;
import org.osgi.service.cm.ConfigurationAdmin;
/**
* {@link ConfigurationService} manages configurations in the {@link ConfigurationAdmin}. The config id is the
* equivalent to the {@link Constants#SERVICE_PID}.
*
* @author Dennis Nobel - Initial contribution
*
*/
public class ConfigurationService {
private ConfigurationAdmin configurationAdmin;
/**
* Returns a configuration for a config id.
*
* @param configId config id
* @return config or null if no config with the given config id exists
* @throws IOException if configuration can not be read
*/
public Configuration get(String configId) throws IOException {
org.osgi.service.cm.Configuration configuration = configurationAdmin.getConfiguration(configId, null);
Dictionary<String, Object> properties = configuration.getProperties();
return toConfiguration(properties);
}
/**
* Creates or updates a configuration for a config id.
*
* @param configId config id
* @param newConfiguration the configuration
* @return old config or null if no old config existed
* @throws IOException if configuration can not be stored
*/
public Configuration update(String configId, Configuration newConfiguration) throws IOException {
return update(configId, newConfiguration, false);
}
/**
* Creates or updates a configuration for a config id.
*
* @param configId config id
* @param newConfiguration the configuration
* @param override if true, it overrides the old config completely. means it deletes all parameters even if they are
* not defined in the given configuration.
* @return old config or null if no old config existed
* @throws IOException if configuration can not be stored
*/
public Configuration update(String configId, Configuration newConfiguration, boolean override) throws IOException {
org.osgi.service.cm.Configuration configuration = configurationAdmin.getConfiguration(configId, null);
Configuration oldConfiguration = toConfiguration(configuration.getProperties());
Dictionary<String, Object> properties = getProperties(configuration);
Set<Entry<String, Object>> configurationParameters = newConfiguration.getProperties().entrySet();
if (override) {
Set<String> keySet = oldConfiguration.keySet();
for (String key : keySet) {
properties.remove(key);
}
}
for (Entry<String, Object> configurationParameter : configurationParameters) {
Object value = configurationParameter.getValue();
if (value == null) {
properties.remove(configurationParameter.getKey());
} else if (value instanceof String || value instanceof Integer || value instanceof Boolean
|| value instanceof Object[] || value instanceof Collection) {
properties.put(configurationParameter.getKey(), value);
} else {
// the config admin does not support complex object types, so let's store the string representation
properties.put(configurationParameter.getKey(), value.toString());
}
}
configuration.update(properties);
return oldConfiguration;
}
/**
* Deletes a configuration for a config id.
*
* @param configId config id
* @return old config or null if no old config existed
* @throws IOException if configuration can not be removed
*/
public Configuration delete(String configId) throws IOException {
org.osgi.service.cm.Configuration serviceConfiguration = configurationAdmin.getConfiguration(configId, null);
Configuration oldConfiguration = toConfiguration(serviceConfiguration.getProperties());
serviceConfiguration.delete();
return oldConfiguration;
}
private Configuration toConfiguration(Dictionary<String, Object> dictionary) {
if (dictionary == null) {
return null;
}
Map<String, Object> properties = new HashMap<>(dictionary.size());
Enumeration<String> keys = dictionary.keys();
while (keys.hasMoreElements()) {
String key = keys.nextElement();
if (!key.equals(Constants.SERVICE_PID)) {
properties.put(key, dictionary.get(key));
}
}
return new Configuration(properties);
}
private Dictionary<String, Object> getProperties(org.osgi.service.cm.Configuration configuration) {
Dictionary<String, Object> properties = configuration.getProperties();
return properties != null ? properties : new Hashtable<String, Object>();
}
protected void setConfigurationAdmin(ConfigurationAdmin configurationAdmin) {
this.configurationAdmin = configurationAdmin;
}
protected void unsetConfigurationAdmin(ConfigurationAdmin configurationAdmin) {
this.configurationAdmin = configurationAdmin;
}
}