/*
* Copyright (C) 2009 eXo Platform SAS.
*
* This 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 software 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 software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.exoplatform.portal.resource.compressor.impl;
import java.io.IOException;
import java.io.Reader;
import java.io.StringReader;
import java.io.StringWriter;
import java.io.Writer;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.exoplatform.container.component.ComponentPlugin;
import org.exoplatform.container.xml.InitParams;
import org.exoplatform.management.ManagementAware;
import org.exoplatform.management.ManagementContext;
import org.exoplatform.management.annotations.Managed;
import org.exoplatform.management.annotations.ManagedDescription;
import org.exoplatform.management.jmx.annotations.NameTemplate;
import org.exoplatform.management.jmx.annotations.Property;
import org.exoplatform.portal.resource.compressor.ResourceCompressor;
import org.exoplatform.portal.resource.compressor.ResourceCompressorException;
import org.exoplatform.portal.resource.compressor.ResourceCompressorPlugin;
import org.exoplatform.portal.resource.compressor.ResourceType;
import org.exoplatform.services.log.ExoLogger;
import org.exoplatform.services.log.Log;
/**
* @author <a href="mailto:hoang281283@gmail.com">Minh Hoang TO</a>
* Aug 19, 2010
*/
@Managed
@ManagedDescription("The resource compressor service")
@NameTemplate({@Property(key = "service", value = "resource")})
public class ResourceCompressorService implements ResourceCompressor, ManagementAware
{
/** . */
private Log log = ExoLogger.getLogger(ResourceCompressorService.class);
/** . */
private Map<ResourceType, List<ResourceCompressorPlugin>> plugins;
public ResourceCompressorService(InitParams params) throws Exception
{
plugins = new HashMap<ResourceType, List<ResourceCompressorPlugin>>();
}
public void registerCompressorPlugin(ComponentPlugin plugin)
{
if (plugin instanceof ResourceCompressorPlugin)
{
ResourceCompressorPlugin compressorPlugin = (ResourceCompressorPlugin)plugin;
ResourceType type = compressorPlugin.getResourceType();
List<ResourceCompressorPlugin> sameResourceTypePlugins = plugins.get(type);
if (sameResourceTypePlugins != null)
{
sameResourceTypePlugins.add(compressorPlugin);
log.debug("Loaded compressor plugin: " + compressorPlugin.getName() + " for resource type "
+ type.toString());
}
else
{
List<ResourceCompressorPlugin> newListOfPlugins = new ArrayList<ResourceCompressorPlugin>();
newListOfPlugins.add(compressorPlugin);
log.debug("Loaded compressor plugin: " + compressorPlugin.getName() + " for new resource type "
+ type.toString());
plugins.put(type, newListOfPlugins);
}
}
}
public ResourceCompressorPlugin getCompressorPlugin(ResourceType type, String name)
{
List<ResourceCompressorPlugin> sameResourceTypePlugins = plugins.get(type);
if (sameResourceTypePlugins != null)
{
for (ResourceCompressorPlugin plugin : sameResourceTypePlugins)
{
if (plugin.getName().equals(name))
{
return plugin;
}
}
}
return null;
}
@Override
final public boolean isSupported(ResourceType resourceType)
{
return (getHighestPriorityCompressorPlugin(resourceType) != null);
}
@Override
final public void compress(Reader input, Writer output, ResourceType resourceType)
throws ResourceCompressorException, IOException
{
ResourceCompressorPlugin plugin = getHighestPriorityCompressorPlugin(resourceType);
if (plugin != null)
{
plugin.compress(input, output);
}
else
{
throw new ResourceCompressorException("There is no compressor for " + resourceType + " type");
}
}
@Override
public String compress(String input, ResourceType resourceType) throws ResourceCompressorException, IOException
{
StringReader reader = new StringReader(input);
StringWriter writer = new StringWriter();
compress(reader, writer, resourceType);
return writer.toString();
}
public ResourceCompressorPlugin getHighestPriorityCompressorPlugin(ResourceType resourceType)
{
List<ResourceCompressorPlugin> candidates = plugins.get(resourceType);
if (candidates == null || candidates.size() == 0)
{
return null;
}
//Loop the list instead of invoking sort method
int highestPriorityIndex = 0;
int maxPriority = -1;
for (int i = 0; i < candidates.size(); i++)
{
int currentPriority = candidates.get(i).getPriority();
if (currentPriority > maxPriority)
{
highestPriorityIndex = i;
maxPriority = currentPriority;
}
}
return candidates.get(highestPriorityIndex);
}
public void setContext(ManagementContext context)
{
if (context == null)
{
return;
}
//
for (Map.Entry<ResourceType, List<ResourceCompressorPlugin>> entry : plugins.entrySet())
{
for (ResourceCompressorPlugin plugin : entry.getValue())
{
context.register(plugin);
}
}
}
}