/*
* Eoulsan development code
*
* This code may be freely distributed and modified under the
* terms of the GNU Lesser General Public License version 2.1 or
* later and CeCILL-C. This should be distributed with the code.
* If you do not have a copy, see:
*
* http://www.gnu.org/licenses/lgpl-2.1.txt
* http://www.cecill.info/licences/Licence_CeCILL-C_V1-en.txt
*
* Copyright for this code is held jointly by the Genomic platform
* of the Institut de Biologie de l'École normale supérieure and
* the individual authors. These should be listed in @author doc
* comments.
*
* For more information on the Eoulsan project and its aims,
* or to join the Eoulsan Google group, visit the home page
* at:
*
* http://outils.genomique.biologie.ens.fr/eoulsan
*
*/
package fr.ens.biologie.genomique.eoulsan.util;
import static com.google.common.base.Preconditions.checkNotNull;
import static fr.ens.biologie.genomique.eoulsan.EoulsanLogger.getLogger;
import java.io.IOException;
import java.io.InputStream;
import java.util.ServiceConfigurationError;
import fr.ens.biologie.genomique.eoulsan.EoulsanException;
/**
* This class allow to define a resource loader for resources in the class path.
* @param <S> Type of the data to load
* @author Laurent Jourdren
* @since 2.0
*/
public abstract class ClassPathResourceLoader<S>
extends AbstractResourceLoader<S> {
private final Class<S> clazz;
private final String resourceBasePath;
//
// Resources loading
//
@Override
protected InputStream getResourceAsStream(final String resourcePath)
throws IOException {
checkNotNull(resourcePath, "resourcePath argument cannot be null");
// Get the classloader
final ClassLoader loader = Thread.currentThread().getContextClassLoader();
return loader.getResourceAsStream(resourcePath);
}
@Override
public void reload() {
try {
for (String filename : ServiceListLoader.load(this.clazz.getName())) {
final String resourcePath = this.resourceBasePath + filename;
getLogger().fine("Try to load "
+ this.clazz.getSimpleName() + " from " + filename + " resource");
final S resource =
load(getResourceAsStream(resourcePath), resourcePath);
if (resource == null) {
throw new EoulsanException("Cannot load resource: " + resourcePath);
}
final String resourceName = getResourceName(resource);
if (resourceName == null) {
throw new EoulsanException(
"Cannot get resource name for resource: " + resource);
}
addResource(resourceName, resourcePath);
}
} catch (IOException | EoulsanException e) {
throw new ServiceConfigurationError("Unable to load resource", e);
}
}
//
// Constructor
//
/**
* Constructor.
* @param clazz the Class type of the resource to load
* @param resourcePath the path in the class path where are the resources to
* load
*/
public ClassPathResourceLoader(final Class<S> clazz,
final String resourcePath) {
checkNotNull(clazz, "clazz argument cannot be null");
checkNotNull(resourcePath, "resourcePath argument cannot be null");
this.clazz = clazz;
this.resourceBasePath = resourcePath;
}
}