/*!
* This program is free software; you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software
* Foundation.
*
* You should have received a copy of the GNU Lesser General Public License along with this
* program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
* or from the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* This program 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.
*
* Copyright (c) 2002-2013 Pentaho Corporation.. All rights reserved.
*/
package org.pentaho.reporting.libraries.css.model;
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.util.Iterator;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.pentaho.reporting.libraries.base.config.Configuration;
import org.pentaho.reporting.libraries.base.util.ObjectUtilities;
import org.pentaho.reporting.libraries.base.util.LinkedMap;
import org.pentaho.reporting.libraries.css.LibCssBoot;
/**
* This class should not be static, or we might create a memory leak.
*
* @author Thomas Morgner
*/
public class StyleKeyRegistry
{
private static final Log logger = LogFactory.getLog(StyleKeyRegistry.class);
private static StyleKeyRegistry registry;
public static synchronized StyleKeyRegistry getRegistry()
{
if (registry == null)
{
throw new IllegalStateException("You have to boot LibCSS to make all style-keys known");
}
return registry;
}
public static void performBoot()
{
if (registry != null)
{
return;
}
registry = new StyleKeyRegistry();
registry.registerDefaults();
registry.locked = true;
}
private LinkedMap knownStyleKeys;
private boolean locked;
private StyleKeyRegistry()
{
knownStyleKeys = new LinkedMap();
}
public StyleKey findKeyByName(final String name)
{
return (StyleKey) knownStyleKeys.get(name);
}
public int getKeyCount()
{
return knownStyleKeys.size();
}
public synchronized void registerDefaults()
{
if (locked)
{
throw new IllegalStateException
("All StyleKeys must be registered during the bootup. The registry is locked now.");
}
final Configuration config = LibCssBoot.getInstance().getGlobalConfig();
final Iterator it = config.findPropertyKeys("org.pentaho.reporting.libraries.css.stylekeys.");
final ClassLoader classLoader = ObjectUtilities.getClassLoader(StyleKeyRegistry.class);
while (it.hasNext())
{
final String key = (String) it.next();
try
{
final String className = config.getConfigProperty(key);
final Class c = Class.forName(className, false, classLoader);
registerClass(c);
}
catch (ClassNotFoundException e)
{
// ignore that class
}
catch (NullPointerException e)
{
// ignore invalid values as well.
}
}
}
private 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)
{
logger.warn("Invalid implementation: StyleKeys should be 'public static final': " + c);
}
if (field.getType().isAssignableFrom(StyleKey.class))
{
final StyleKey value = (StyleKey) field.get(null);
if (value == null)
{
logger.warn("Invalid implementation: StyleKeys fields must not be null: " + c);
}
// 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;
}
if (locked)
{
throw new IllegalStateException
("All StyleKeys must be registered during the bootup. The registry is locked now.");
}
final StyleKey createdKey = new StyleKey
(name, trans, inherited, knownStyleKeys.size(), validity);
knownStyleKeys.put(name, createdKey);
return createdKey;
}
public synchronized StyleKey[] getKeys()
{
return (StyleKey[]) knownStyleKeys.values(new StyleKey[knownStyleKeys.size()]);
}
public synchronized StyleKey[] getKeys(final StyleKey[] input)
{
return (StyleKey[]) knownStyleKeys.values(input);
}
}