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/*
* Copyright (c) 2011, 2012, 2016 Eike Stepper (Loehne, Germany) and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Eike Stepper - initial API and implementation
*/
package org.eclipse.emf.cdo.spi.common;
import org.eclipse.emf.cdo.common.lob.CDOLobInfo;
import org.eclipse.emf.cdo.common.lob.CDOLobStore;
import org.eclipse.net4j.util.HexUtil;
import org.eclipse.net4j.util.WrappedException;
import org.eclipse.net4j.util.io.DigestWriter;
import org.eclipse.net4j.util.io.ExpectedFileInputStream;
import org.eclipse.net4j.util.io.ExpectedFileReader;
import org.eclipse.net4j.util.io.IORuntimeException;
import org.eclipse.net4j.util.io.IOUtil;
import org.eclipse.net4j.util.om.OMPlatform;
import java.io.File;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;
import java.security.DigestOutputStream;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
/**
* If the meaning of this type isn't clear, there really should be more of a description here...
*
* @author Eike Stepper
* @since 4.0
*/
public class CDOLobStoreImpl implements CDOLobStore
{
public static final CDOLobStoreImpl INSTANCE = new CDOLobStoreImpl();
private File folder;
private int tempID;
public CDOLobStoreImpl(File folder)
{
this.folder = folder;
if (folder.exists())
{
checkDirectory();
}
}
public CDOLobStoreImpl()
{
this(getDefaultFolder());
}
public File getFolder()
{
if (!folder.exists())
{
folder.mkdirs();
}
checkDirectory();
return folder;
}
public File getBinaryFile(byte[] id)
{
return new File(getFolder(), HexUtil.bytesToHex(id) + ".blob");
}
public InputStream getBinary(CDOLobInfo info) throws IOException
{
File file = getBinaryFile(info.getID());
long expectedSize = info.getSize();
return new ExpectedFileInputStream(file, expectedSize);
}
public CDOLobInfo putBinary(InputStream contents) throws IOException
{
File tempFile = getTempFile();
MessageDigest digest = createDigest();
digest.update("BINARY".getBytes());
FileOutputStream fos = null;
long size;
try
{
fos = new FileOutputStream(tempFile);
DigestOutputStream dos = new DigestOutputStream(fos, digest);
size = IOUtil.copyBinary(contents, dos);
}
finally
{
IOUtil.close(fos);
}
byte[] id = digest.digest();
makePermanent(tempFile, getBinaryFile(id));
return new CDOLobInfo(id, size);
}
public File getCharacterFile(byte[] id)
{
return new File(getFolder(), HexUtil.bytesToHex(id) + ".clob");
}
public Reader getCharacter(CDOLobInfo info) throws IOException
{
File file = getCharacterFile(info.getID());
long expectedSize = info.getSize();
return new ExpectedFileReader(file, expectedSize);
}
public CDOLobInfo putCharacter(Reader contents) throws IOException
{
File tempFile = getTempFile();
MessageDigest digest = createDigest();
digest.update("CHARACTER".getBytes());
FileWriter fw = null;
long size;
try
{
fw = new FileWriter(tempFile);
DigestWriter dw = new DigestWriter(fw, digest);
size = IOUtil.copyCharacter(contents, dw);
}
finally
{
IOUtil.close(fw);
}
byte[] id = digest.digest();
makePermanent(tempFile, getCharacterFile(id));
return new CDOLobInfo(id, size);
}
@Override
public String toString()
{
return "CDOLobStore[" + folder + "]";
}
protected MessageDigest createDigest()
{
try
{
return MessageDigest.getInstance("SHA-1");
}
catch (NoSuchAlgorithmException ex)
{
throw WrappedException.wrap(ex);
}
}
protected synchronized File getTempFile()
{
for (;;)
{
++tempID;
File file = new File(getFolder(), "contents" + tempID + ".tmp");
if (!file.exists())
{
return file;
}
}
}
private void makePermanent(File tempFile, File file)
{
if (file.exists())
{
tempFile.delete();
}
else
{
tempFile.renameTo(file);
}
}
private void checkDirectory()
{
if (!folder.isDirectory())
{
throw new IORuntimeException("Not a folder: " + folder.getAbsolutePath());
}
}
private static File getDefaultFolder()
{
String path = OMPlatform.INSTANCE.getProperty("java.io.tmpdir");
return new File(new File(path), "cdo_lobs");
}
}
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