/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.marmotta.ldcache.backend.file.repository;
import org.apache.marmotta.ldcache.api.LDCachingConnection;
import org.apache.marmotta.ldcache.backend.file.util.FileBackendUtils;
import org.apache.marmotta.ldcache.model.CacheEntry;
import org.openrdf.model.URI;
import org.openrdf.repository.Repository;
import org.openrdf.repository.RepositoryConnection;
import org.openrdf.repository.RepositoryException;
import org.openrdf.repository.base.RepositoryConnectionWrapper;
import java.io.File;
import java.io.IOException;
public class LDCachingFileRepositoryConnection extends RepositoryConnectionWrapper implements LDCachingConnection {
private final File baseDir;
public LDCachingFileRepositoryConnection(Repository repository, RepositoryConnection repositoryConnection, File baseDir) {
super(repository, repositoryConnection);
this.baseDir = baseDir;
}
@Override
public CacheEntry getCacheEntry(URI resource) throws RepositoryException {
try {
final File dataFile = FileBackendUtils.getMetaFile(resource, baseDir);
if (!(dataFile.exists())) return null;
final CacheEntry ce = FileBackendUtils.readCacheEntry(dataFile, getValueFactory());
if (FileBackendUtils.isExpired(ce)) return null;
return ce;
} catch (IOException e) {
throw new RepositoryException("could not read cache entry for " + resource.stringValue(), e);
}
}
@Override
public void addCacheEntry(URI resource, CacheEntry entry)
throws RepositoryException {
try {
FileBackendUtils.writeCacheEntry(entry, baseDir);
} catch (IOException e) {
throw new RepositoryException("could not store cache entry for " + resource.stringValue(), e);
}
}
@Override
public void removeCacheEntry(URI resource) throws RepositoryException {
final File metaFile = FileBackendUtils.getMetaFile(resource, baseDir);
if (metaFile.exists()) metaFile.delete();
}
}