org.apache.jackrabbit.value.BinaryImpl Maven / Gradle / Ivy
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/*
* 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.jackrabbit.value;
import org.apache.jackrabbit.util.TransientFileFactory;
import javax.jcr.Binary;
import javax.jcr.RepositoryException;
import java.io.File;
import java.io.InputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.FileOutputStream;
import java.io.FileInputStream;
import java.io.RandomAccessFile;
import java.io.FileNotFoundException;
import java.io.ByteArrayInputStream;
/**
* BinaryImpl implements the Binary interface.
*/
public class BinaryImpl implements Binary {
/**
* empty array
*/
private static final byte[] EMPTY_BYTE_ARRAY = new byte[0];
/**
* max size for keeping tmp data in memory
*/
private static final int MAX_BUFFER_SIZE = 0x10000;
/**
* underlying tmp file
*/
private final File tmpFile;
/**
* buffer for small-sized data
*/
private byte[] buffer = EMPTY_BYTE_ARRAY;
/**
* Creates a new BinaryImpl instance from an
* InputStream. The contents of the stream is spooled
* to a temporary file or to a byte buffer if its size is smaller than
* {@link #MAX_BUFFER_SIZE}.
*
* @param in stream to be represented as a BLOBFileValue instance
* @throws IOException if an error occurs while reading from the stream or
* writing to the temporary file
*/
public BinaryImpl(InputStream in) throws IOException {
byte[] spoolBuffer = new byte[0x2000];
int read;
int len = 0;
OutputStream out = null;
File spoolFile = null;
try {
while ((read = in.read(spoolBuffer)) > 0) {
if (out != null) {
// spool to temp file
out.write(spoolBuffer, 0, read);
len += read;
} else if (len + read > MAX_BUFFER_SIZE) {
// threshold for keeping data in memory exceeded;
// create temp file and spool buffer contents
TransientFileFactory fileFactory = TransientFileFactory.getInstance();
spoolFile = fileFactory.createTransientFile("bin", null, null);
out = new FileOutputStream(spoolFile);
out.write(buffer, 0, len);
out.write(spoolBuffer, 0, read);
buffer = null;
len += read;
} else {
// reallocate new buffer and spool old buffer contents
byte[] newBuffer = new byte[len + read];
System.arraycopy(buffer, 0, newBuffer, 0, len);
System.arraycopy(spoolBuffer, 0, newBuffer, len, read);
buffer = newBuffer;
len += read;
}
}
} finally {
if (out != null) {
out.close();
}
}
// init fields
tmpFile = spoolFile;
}
/**
* Creates a new BinaryImpl instance from a
* byte[] array.
*
* @param buffer byte array to be represented as a BinaryImpl
* instance
*/
public BinaryImpl(byte[] buffer) {
if (buffer == null) {
throw new IllegalArgumentException("buffer must be non-null");
}
this.buffer = buffer;
tmpFile = null;
}
/**
* {@inheritDoc}
*/
public InputStream getStream() throws RepositoryException {
if (tmpFile != null) {
try {
// this instance is backed by a temp file
return new FileInputStream(tmpFile);
} catch (FileNotFoundException e) {
throw new RepositoryException("already disposed");
}
} else {
// this instance is backed by an in-memory buffer
return new ByteArrayInputStream(buffer);
}
}
/**
* {@inheritDoc}
*/
public int read(byte[] b, long position) throws IOException, RepositoryException {
if (tmpFile != null) {
// this instance is backed by a temp file
RandomAccessFile raf = new RandomAccessFile(tmpFile, "r");
try {
raf.seek(position);
return raf.read(b);
} finally {
raf.close();
}
} else {
// this instance is backed by an in-memory buffer
int length = Math.min(b.length, buffer.length - (int) position);
if (length > 0) {
System.arraycopy(buffer, (int) position, b, 0, length);
return length;
} else {
return -1;
}
}
}
/**
* {@inheritDoc}
*/
public long getSize() throws RepositoryException {
if (tmpFile != null) {
// this instance is backed by a temp file
if (tmpFile.exists()) {
return tmpFile.length();
} else {
return -1;
}
} else {
// this instance is backed by an in-memory buffer
return buffer.length;
}
}
/**
* {@inheritDoc}
*/
public void dispose() {
if (tmpFile != null) {
// this instance is backed by a temp file
tmpFile.delete();
} else {
// this instance is backed by an in-memory buffer
buffer = EMPTY_BYTE_ARRAY;
}
}
}