/**
* Copyright (C) cedarsoft GmbH.
*
* Licensed under the GNU General Public License version 3 (the "License")
* with Classpath Exception; you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.cedarsoft.org/gpl3ce
* (GPL 3 with Classpath Exception)
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 3 only, as
* published by the Free Software Foundation. cedarsoft GmbH designates this
* particular file as subject to the "Classpath" exception as provided
* by cedarsoft GmbH in the LICENSE file that accompanied this code.
*
* This code 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 General Public License
* version 3 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 3 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact cedarsoft GmbH, 72810 Gomaringen, Germany,
* or visit www.cedarsoft.com if you need additional information or
* have any questions.
*/
package com.cedarsoft.serialization.serializers.jackson.registry;
import com.cedarsoft.exceptions.StillContainedException;
import org.apache.commons.io.filefilter.DirectoryFileFilter;
import javax.annotation.Nonnull;
import java.io.File;
import java.io.FileFilter;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.HashSet;
import java.util.Set;
/**
* Implementation that is based on simple files.
*/
public class DirBasedObjectsAccess implements AbstractRegistrySerializingStrategy.ObjectsAccess {
@Nonnull
private final File baseDir;
public DirBasedObjectsAccess( @Nonnull File baseDir ) {
assert baseDir.exists();
assert baseDir.isDirectory();
this.baseDir = baseDir;
}
/**
* Provides the ids
*
* @return the ids
*
* @throws FileNotFoundException
*/
@Nonnull
@Override
public Set<? extends String> getIds() throws IOException {
assert baseDir.exists();
File[] dirs = baseDir.listFiles( ( FileFilter ) DirectoryFileFilter.DIRECTORY );
if ( dirs == null ) {
throw new FileNotFoundException( "Could not list dirs in " + baseDir.getAbsolutePath() );
}
Set<String> ids = new HashSet<String>();
for ( File dir : dirs ) {
ids.add( dir.getName() );
}
return ids;
}
@Nonnull
public File addDirectory( @Nonnull String id ) throws StillContainedException {
File dir = getDirInternal( id );
if ( dir.exists() ) {
throw new StillContainedException( id );
}
dir.mkdir();
return dir;
}
@Nonnull
public File getDirectory( @Nonnull String id ) throws FileNotFoundException {
File directory = getDirInternal( id );
if ( !directory.exists() ) {
throw new FileNotFoundException( "No dir found for <" + id + "> at " + directory.getAbsolutePath() );
}
return directory;
}
@Nonnull
private File getDirInternal( @Nonnull String id ) {
return new File( baseDir, id );
}
@Nonnull
public File getBaseDir() {
return baseDir;
}
}