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/*
* Copyright 2006-2010 Amazon Technologies, Inc. or its affiliates.
* Amazon, Amazon.com and Carbonado are trademarks or registered trademarks
* of Amazon Technologies, Inc. or its affiliates. All rights reserved.
*
* Licensed 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 com.amazon.carbonado.lob;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.InputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.RandomAccessFile;
import com.amazon.carbonado.FetchException;
import com.amazon.carbonado.PersistException;
import com.amazon.carbonado.spi.RAFInputStream;
import com.amazon.carbonado.spi.RAFOutputStream;
/**
* Implementation of a Blob which is backed by a File.
*
* @author Brian S O'Neill
*/
public class FileBlob extends AbstractBlob {
private final File mFile;
public FileBlob(File file) {
mFile = file;
}
public InputStream openInputStream() throws FetchException {
return openInputStream(0, -1);
}
public InputStream openInputStream(long pos) throws FetchException {
return openInputStream(pos, -1);
}
public InputStream openInputStream(long pos, int bufferSize) throws FetchException {
try {
RandomAccessFile raf = new RandomAccessFile(mFile, "r");
if (pos != 0) {
raf.seek(pos);
}
InputStream in = new RAFInputStream(raf);
if (bufferSize < 0) {
in = new BufferedInputStream(in);
} else if (bufferSize > 0) {
in = new BufferedInputStream(in, bufferSize);
}
return in;
} catch (IOException e) {
throw new FetchException(e);
}
}
public long getLength() throws FetchException {
return mFile.length();
}
public OutputStream openOutputStream() throws PersistException {
return openOutputStream(0, -1);
}
public OutputStream openOutputStream(long pos) throws PersistException {
return openOutputStream(pos, -1);
}
public OutputStream openOutputStream(long pos, int bufferSize) throws PersistException {
try {
RandomAccessFile raf = new RandomAccessFile(mFile, "rw");
if (pos != 0) {
raf.seek(pos);
}
OutputStream out = new RAFOutputStream(raf);
if (bufferSize < 0) {
out = new BufferedOutputStream(out);
} else if (bufferSize > 0) {
out = new BufferedOutputStream(out, bufferSize);
}
return out;
} catch (IOException e) {
throw new PersistException(e);
}
}
public void setLength(long length) throws PersistException {
try {
RandomAccessFile raf = new RandomAccessFile(mFile, "rw");
raf.setLength(length);
raf.close();
} catch (IOException e) {
throw new PersistException(e);
}
}
/**
* Always returns null.
*/
public Object getLocator() {
return null;
}
}
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