/*
* Copyright 2013 JBoss Inc
*
* 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 org.artificer.common;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;
import org.apache.commons.configuration.AbstractConfiguration;
import org.apache.commons.configuration.Configuration;
import org.apache.commons.configuration.SystemConfiguration;
/**
* A {@link Configuration} implementation based on the current java system
* properties. This implementation differs from {@link SystemConfiguration}
* because it pulls the system properties live, rather than caching them
* when the configuration instance is created. This allows configuration to
* change by modifying the system properties.
* @author eric.wittmann@redhat.com
*/
public class SystemPropertiesConfiguration extends AbstractConfiguration {
/**
* Constructor.
*/
public SystemPropertiesConfiguration() {
}
/**
* @see org.apache.commons.configuration.Configuration#isEmpty()
*/
@Override
public boolean isEmpty() {
return false;
}
/**
* @see org.apache.commons.configuration.Configuration#containsKey(java.lang.String)
*/
@Override
public boolean containsKey(String key) {
return System.getProperties().containsKey(key);
}
/**
* @see org.apache.commons.configuration.Configuration#getProperty(java.lang.String)
*/
@Override
public Object getProperty(String key) {
return System.getProperties().getProperty(key);
}
/**
* @see org.apache.commons.configuration.Configuration#getKeys()
*/
@Override
public Iterator<String> getKeys() {
Set<String> keys = new HashSet<String>();
Set<Object> keySet = System.getProperties().keySet();
for (Object object : keySet) {
keys.add(String.valueOf(object));
}
return keys.iterator();
}
/**
* @see org.apache.commons.configuration.AbstractConfiguration#addPropertyDirect(java.lang.String, java.lang.Object)
*/
@Override
protected void addPropertyDirect(String key, Object value) {
System.getProperties().setProperty(key, String.valueOf(value));
}
}