/**
* ===========================================
* LibLayout : a free Java layouting library
* ===========================================
*
* Project Info: http://reporting.pentaho.org/liblayout/
*
* (C) Copyright 2006-2007, by Pentaho Corporation and Contributors.
*
* 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., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307, USA.
*
* [Java is a trademark or registered trademark of Sun Microsystems, Inc.
* in the United States and other countries.]
*
* ------------
* $Id: StyleKeyRegistry.java 2739 2007-04-02 11:41:22Z taqua $
* ------------
* (C) Copyright 2006-2007, by Pentaho Corporation.
*/
package org.jfree.layouting.input.style;
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.util.HashMap;
import java.util.Iterator;
import org.jfree.layouting.LibLayoutBoot;
import org.jfree.util.Configuration;
import org.jfree.util.Log;
import org.jfree.util.ObjectUtilities;
/**
* This class should not be static, or we might create a memory leak.
*
* @author Thomas Morgner
*/
public class StyleKeyRegistry
{
private static StyleKeyRegistry registry;
public static synchronized StyleKeyRegistry getRegistry()
{
if (registry == null)
{
registry = new StyleKeyRegistry();
registry.registerDefaults();
}
return registry;
}
private HashMap knownStyleKeys;
private StyleKeyRegistry()
{
knownStyleKeys = new HashMap();
}
public StyleKey findKeyByName(final String name)
{
return (StyleKey) knownStyleKeys.get(name);
}
public int getIndexForKey(final StyleKey key)
{
final Integer index = (Integer) knownStyleKeys.get(key.getName());
if (index != null)
{
return index.intValue();
}
throw new IllegalStateException("This key is not registered. How could that be?");
}
public int getKeyCount()
{
return knownStyleKeys.size();
}
public synchronized void registerDefaults()
{
final Configuration config = LibLayoutBoot.getInstance().getGlobalConfig();
final Iterator it = config.findPropertyKeys("org.jfree.layouting.stylekeys.");
final ClassLoader classLoader =
ObjectUtilities.getClassLoader(StyleKeyRegistry.class);
while (it.hasNext())
{
final String key = (String) it.next();
try
{
final Class c = classLoader.loadClass(config.getConfigProperty(key));
registerClass(c);
}
catch (ClassNotFoundException e)
{
// ignore that class
}
catch (NullPointerException e)
{
// ignore invalid values as well.
}
}
}
public synchronized void registerClass(final Class c)
{
// Log.debug ("Registering stylekeys from " + c);
try
{
final Field[] fields = c.getFields();
for (int i = 0; i < fields.length; i++)
{
final Field field = fields[i];
final int modifiers = field.getModifiers();
if (Modifier.isPublic(modifiers) &&
Modifier.isStatic(modifiers))
{
if (Modifier.isFinal(modifiers) == false)
{
Log.warn ("Invalid implementation: StyleKeys should be 'public static final': " + c);
}
if (field.getType().isAssignableFrom(StyleKey.class))
{
final StyleKey value = (StyleKey) field.get(null);
// ignore the returned value, all we want is to trigger the key
// creation
// Log.debug ("Loaded key " + value);
}
}
}
}
catch (IllegalAccessException e)
{
// wont happen, we've checked it..
}
}
public synchronized StyleKey createKey(final String name,
final boolean trans,
final boolean inherited,
final int validity)
{
final StyleKey existingKey = findKeyByName(name);
if (existingKey != null)
{
return existingKey;
}
final StyleKey createdKey = new StyleKey
(name, trans, inherited, knownStyleKeys.size(), validity);
knownStyleKeys.put(name, createdKey);
return createdKey;
}
public synchronized StyleKey[] getKeys()
{
return getKeys(new StyleKey[knownStyleKeys.size()]);
}
public synchronized StyleKey[] getKeys(final StyleKey[] input)
{
return (StyleKey[]) knownStyleKeys.values().toArray(input);
}
}