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/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF 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.apache.qpid.server.configuration;
import org.apache.commons.configuration.Configuration;
import org.apache.log4j.Logger;
import org.apache.qpid.configuration.Configured;
import org.apache.qpid.configuration.PropertyUtils;
import org.apache.qpid.configuration.PropertyException;
import org.apache.qpid.server.registry.ApplicationRegistry;
import java.lang.reflect.Field;
/**
* This class contains utilities for populating classes automatically from values pulled from configuration
* files.
*/
public class Configurator
{
private static final Logger _logger = Logger.getLogger(Configurator.class);
/**
* Configure a given instance using the supplied configuration. Note that superclasses are <b>not</b>
* currently configured but this could easily be added if required.
* @param instance the instance to configure
* @param config the configuration to use to configure the object
*/
public static void configure(Object instance, Configuration config)
{
for (Field f : instance.getClass().getDeclaredFields())
{
Configured annotation = f.getAnnotation(Configured.class);
if (annotation != null)
{
setValueInField(f, instance, config, annotation);
}
}
}
/**
* Configure a given instance using the application configuration. Note that superclasses are <b>not</b>
* currently configured but this could easily be added if required.
* @param instance the instance to configure
*/
public static void configure(Object instance)
{
configure(instance, ApplicationRegistry.getInstance().getConfiguration());
}
private static void setValueInField(Field f, Object instance, Configuration config, Configured annotation)
{
Class fieldClass = f.getType();
String configPath = annotation.path();
try
{
if (fieldClass == String.class)
{
String val = config.getString(configPath, annotation.defaultValue());
val = PropertyUtils.replaceProperties(val);
f.set(instance, val);
}
else if (fieldClass == int.class)
{
int val = config.getInt(configPath, Integer.parseInt(annotation.defaultValue()));
f.setInt(instance, val);
}
else if (fieldClass == long.class)
{
long val = config.getLong(configPath, Long.parseLong(annotation.defaultValue()));
f.setLong(instance, val);
}
else if (fieldClass == double.class)
{
double val = config.getDouble(configPath, Double.parseDouble(annotation.defaultValue()));
f.setDouble(instance, val);
}
else if (fieldClass == boolean.class)
{
boolean val = config.getBoolean(configPath, Boolean.parseBoolean(annotation.defaultValue()));
f.setBoolean(instance, val);
}
else
{
_logger.error("Unsupported field type " + fieldClass + " for " + f + " IGNORING configured value");
}
}
catch (PropertyException e)
{
_logger.error("Unable to expand property: " + e + " INGORING field " + f, e);
}
catch (IllegalAccessException e)
{
_logger.error("Unable to access field " + f + " IGNORING configured value");
}
}
}
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