/*
* Syncany, www.syncany.org
* Copyright (C) 2011-2015 Philipp C. Heckel <philipp.heckel@gmail.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.syncany.plugins.transfer.files;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.syncany.database.MultiChunkEntry.MultiChunkId;
import org.syncany.plugins.transfer.StorageException;
import org.syncany.util.StringUtil;
/**
* The multichunk file represents a multichunk on the remote storage.
*
* <p><b>Name pattern:</b> The name pattern of a multichunk file is
* <b>multichunk-<multichunkid></b>. Initializing an
* instance with a non-matching name will throw an exception.
*
* @author Philipp C. Heckel <philipp.heckel@gmail.com>
*/
public class MultichunkRemoteFile extends RemoteFile {
private static final Pattern NAME_PATTERN = Pattern.compile("multichunk-([a-f0-9]+)");
private static final String NAME_FORMAT = "multichunk-%s";
private byte[] multiChunkId;
/**
* Initializes a new multichunk file, given a name. This constructor might
* be called by the {@link RemoteFileFactory#createRemoteFile(String, Class) createRemoteFile()}
* method of the {@link RemoteFileFactory}.
*
* <p>If the pattern matches, the multichunk identifier is set and can be
* queried by {@link #getMultiChunkId()}.
*
* @param name Multichunk file name; <b>must</b> always match the {@link #NAME_PATTERN}
* @throws StorageException If the name is not match the name pattern
*/
public MultichunkRemoteFile(String name) throws StorageException {
super(name);
}
/**
* Initializes a new multichunk file, given a multichunk identifier
*
* @param multiChunkId The identifier of the multichunk
* @throws StorageException Never throws an exception
*/
public MultichunkRemoteFile(MultiChunkId multiChunkId) throws StorageException {
super(String.format(NAME_FORMAT, multiChunkId.toString()));
}
/**
* Returns the multichunk identifier
*/
public byte[] getMultiChunkId() {
return multiChunkId;
}
@Override
protected String validateName(String name) throws StorageException {
Matcher matcher = NAME_PATTERN.matcher(name);
if (!matcher.matches()) {
throw new StorageException(name + ": remote filename pattern does not match: " + NAME_PATTERN.pattern() + " expected.");
}
try {
multiChunkId = StringUtil.fromHex(matcher.group(1));
}
catch (Exception e) {
throw new StorageException(name + ": remote filename pattern does not match (invalid hex): " + NAME_PATTERN.pattern() + " expected.");
}
return name;
}
}