/* ========================================================================
* JCommon : a free general purpose class library for the Java(tm) platform
* ========================================================================
*
* (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
*
* Project Info: http://www.jfree.org/jcommon/index.html
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*
* [Java is a trademark or registered trademark of Sun Microsystems, Inc.
* in the United States and other countries.]
*
* -------------------------
* DefaultConfiguration.java
* -------------------------
* (C)opyright 2003, 2004, by Thomas Morgner and Contributors.
*
* Original Author: Thomas Morgner;
* Contributor(s): David Gilbert (for Object Refinery Limited);
*
* $Id: DefaultConfiguration.java,v 1.6 2008/09/10 09:21:30 mungady Exp $
*
* Changes
* -------
* 04.06.2003 : Initial version (TM);
*
*/
package org.jfree.util;
import java.util.Collections;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.Properties;
import java.util.TreeSet;
import org.jfree.base.config.ModifiableConfiguration;
/**
* Default configuration.
*
* @author Thomas Morgner.
*/
public class DefaultConfiguration extends Properties
implements ModifiableConfiguration
{
/**
* Creates an empty property list with no default values.
*/
public DefaultConfiguration()
{
super();
}
/**
* Returns the configuration property with the specified key.
*
* @param key the property key.
* @return the property value.
*/
public String getConfigProperty(final String key)
{
return getProperty(key);
}
/**
* Returns the configuration property with the specified key (or the
* specified default value if there is no such property).
* <p/>
* If the property is not defined in this configuration, the code will
* lookup the property in the parent configuration.
*
* @param key the property key.
* @param defaultValue the default value.
* @return the property value.
*/
public String getConfigProperty(final String key, final String defaultValue)
{
return getProperty(key, defaultValue);
}
/**
* Searches all property keys that start with a given prefix.
*
* @param prefix the prefix that all selected property keys should share
* @return the properties as iterator.
*/
public Iterator findPropertyKeys(final String prefix)
{
final TreeSet collector = new TreeSet();
final Enumeration enum1 = keys();
while (enum1.hasMoreElements())
{
final String key = (String) enum1.nextElement();
if (key.startsWith(prefix))
{
if (collector.contains(key) == false)
{
collector.add(key);
}
}
}
return Collections.unmodifiableSet(collector).iterator();
}
/**
* Returns an enumeration of the property keys.
*
* @return An enumeration of the property keys.
*/
public Enumeration getConfigProperties()
{
return keys();
}
/**
* Sets the value of a configuration property.
*
* @param key the property key.
* @param value the property value.
*/
public void setConfigProperty(final String key, final String value)
{
if (value == null)
{
remove(key);
}
else
{
setProperty(key, value);
}
}
}