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/*
* ====================================================================
* Project: openMDX, http://www.openmdx.org/
* Description: Binary Large Object Factory
* Owner: OMEX AG, Switzerland, http://www.omex.ch
* ====================================================================
*
* This software is published under the BSD license as listed below.
*
* Copyright (c) 2006-2013, OMEX AG, Switzerland
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* * Neither the name of the openMDX team nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* ------------------
*
* This product includes software developed by other organizations as
* listed in the NOTICE file.
*/
package org.w3c.cci2;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.EOFException;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.OutputStream;
import java.io.Serializable;
import java.net.URL;
import java.net.URLConnection;
/**
* Binary Large Object Factory
*/
public class BinaryLargeObjects {
/**
* Constructor
*/
private BinaryLargeObjects() {
// To avoid instantiation
}
/**
* Default capacity for stream copy
*/
private final static int CAPACITY = 10000;
/**
* Create a BinaryLargeObject facade for the given byte array
*
* @param source
*
* @return a BinaryLargeObject facade for the given byte array
*/
public static BinaryLargeObject valueOf(
byte[] source
){
return new ArrayLargeObject(
source,
0,
source.length
);
}
/**
* Create a BinaryLargeObject facade for the given byte array
*
* @param source
* @param offset
* @param length
*
* @return a BinaryLargeObject facade for the given byte array
*/
public static BinaryLargeObject valueOf(
byte[] source,
int offset,
int length
){
return new ArrayLargeObject(
source,
offset,
length
);
}
/**
* Create a BinaryLargeObject facade for the given URL
*
* @param source
*
* @return a BinaryLargeObject facade for the given URL
*/
public static BinaryLargeObject valueOf(
URL source
){
return new URLLargeObject(source);
}
/**
* Create a BinaryLargeObject facade for the given file
*
* @param source
*
* @return a BinaryLargeObject facade for the given file
*/
public static BinaryLargeObject valueOf(
File source
){
return new FileLargeObject(source);
}
/**
* Create a BinaryLargeObject facade for the given stream
*
* @param source
*
* @return a BinaryLargeObject facade for the given stream
*/
public static BinaryLargeObject valueOf(
InputStream source
){
return new StreamLargeObject(source);
}
/**
* Create a BinaryLargeObject facade for the given stream
*
* @param source
* @param length
*
* @return a BinaryLargeObject facade for the given stream
*/
public static BinaryLargeObject valueOf(
InputStream source,
Long length
){
return new StreamLargeObject(source, length);
}
/**
* Create a BinaryLargeObject copy of the given stream
*
* @param source
* @param length
*
* @return a BinaryLargeObject copy of the given stream
*
* @throws IOException
*/
public static BinaryLargeObject copyOf(
InputStream source,
Long length
) throws IOException {
ByteArrayOutputStream buffer = length == null ? new ByteArrayOutputStream(
) : new ByteArrayOutputStream(
length.intValue()
);
streamCopy(source, 0, buffer);
return valueOf(buffer.toByteArray());
}
/**
* A negative length is converted to null.
*
* @param length
*
* @return the length as object
*/
public static Long asLength(
long length
){
return length < 0 ? null : Long.valueOf(length);
}
/**
* Copy an input stream's content to an output stream
* @param source
* @param position
* @param target
*
* @return the number of byte written to the output stream
* @throws IOException
*/
public static long streamCopy(
InputStream source,
long position,
OutputStream target
) throws IOException {
byte[] buffer = new byte[CAPACITY];
if(position != 0l) {
source.skip(position);
}
long count = 0l;
for(int n; (n = source.read(buffer)) >= 0;){
count += n;
target.write(buffer, 0, n);
}
return count;
}
//------------------------------------------------------------------------
// Class ArrayLargeObject
//------------------------------------------------------------------------
/**
* Array BLOB
*/
private static class ArrayLargeObject implements BinaryLargeObject, Serializable {
/**
* Constructor
*
* @param value
* @param offset
* @param length
*/
ArrayLargeObject(
final byte[] value,
final int offset,
final int length
) {
this.value = value;
this.offset = offset;
this.length = length;
}
/**
* Implements Serializable
*/
private static final long serialVersionUID = 3886030128086687249L;
private byte[] value;
private int offset;
private int length;
/* (non-Javadoc)
* @see org.w3c.cci2.BinaryLargeObject#getContent()
*/
public InputStream getContent() {
return new ByteArrayInputStream(this.value, this.offset, this.length);
}
/* (non-Javadoc)
* @see org.w3c.cci2.LargeObject#getLength()
*/
public Long getLength(
){
return Long.valueOf(this.length);
}
/* (non-Javadoc)
* @see org.w3c.cci2.BinaryLargeObject#getContent(java.io.OutputStream, long)
*/
public void getContent(
OutputStream stream,
long position
) throws IOException {
int offset = this.offset + (int)position;
int length = this.length - (int)position;
if (length < 0) throw new EOFException(
"Position " + position + " is larger than the objects length " + this.length
);
stream.write(this.value, offset, length);
}
private void writeObject(
ObjectOutputStream stream
) throws IOException {
stream.writeLong(this.length);
stream.write(this.value, this.offset, this.length);
}
private void readObject(
ObjectInputStream stream
) throws IOException, ClassNotFoundException {
this.offset = 0;
this.length = (int)stream.readLong();
this.value = new byte[this.length];
stream.read(this.value);
}
}
//------------------------------------------------------------------------
// Class AbstractLargeObject
//------------------------------------------------------------------------
/**
* The underlying stream may be retrieved once only
*/
private static abstract class AbstractLargeObject implements BinaryLargeObject, Serializable {
/**
* Constructor
*
* @param stream
*/
protected AbstractLargeObject(
Long length
){
this.length = length;
}
/**
* Implements Serializable
*/
private static final long serialVersionUID = -5837819381102619869L;
private transient byte[] value;
private transient Long length;
/**
* Provide the input stream content
*
* @return the content
*
* @throws IOException
*/
protected InputStream newContent(
) throws IOException {
return this.value == null ? null : new ByteArrayInputStream(this.value);
}
/* (non-Javadoc)
* @see org.w3c.cci2.BinaryLargeObject#getContent(java.io.OutputStream, long)
*/
public void getContent(
OutputStream stream,
long position
) throws IOException {
Long length = Long.valueOf(
position + streamCopy(
getContent(),
position,
stream
)
);
this.length = length;
}
/* (non-Javadoc)
* @see org.w3c.cci2.LargeObject#getLength()
*/
public Long getLength(
) throws IOException {
return this.length;
}
protected void setLength(
Long length
){
this.length = length;
}
private void writeObject(
ObjectOutputStream stream
) throws IOException {
ByteArrayOutputStream buffer = new ByteArrayOutputStream();
getContent(buffer, 0);
stream.writeLong(this.length.longValue());
buffer.writeTo(stream);
}
private void readObject(
ObjectInputStream stream
) throws IOException, ClassNotFoundException {
this.length = Long.valueOf(stream.readLong());
this.value = new byte[this.length.intValue()];
stream.read(this.value);
}
}
//------------------------------------------------------------------------
// Class URLLargeObject
//------------------------------------------------------------------------
/**
* URL BLOB
*/
private static class URLLargeObject extends AbstractLargeObject {
/**
* Constructor
*
* @param url
*/
public URLLargeObject(final URL url) {
super(null);
this.url = url;
}
/**
* Implements Serializable
*/
private static final long serialVersionUID = 3916312441998769493L;
/**
*
*/
private transient URL url;
/**
*
*/
private transient URLConnection connection;
/* (non-Javadoc)
* @see org.w3c.cci2.BinaryLargeObject#getContent()
*/
public InputStream getContent(
) throws IOException {
return this.url != null ? getConnection().getInputStream() : newContent();
}
/* (non-Javadoc)
* @see org.w3c.cci2.LargeObject#getLength()
*/
@Override
public Long getLength(
) throws IOException {
Long length = super.getLength();
if(length == null) {
super.setLength(
length = asLength(getConnection().getContentLength())
);
}
return length;
}
/**
* Opens the URL connection
*
* @return the URL connection
*
* @throws IOException
*/
protected URLConnection getConnection() throws IOException{
if(this.connection == null) {
this.connection = url.openConnection();
}
return this.connection;
}
}
//------------------------------------------------------------------------
// Class FileLargeObject
//------------------------------------------------------------------------
/**
* File BLOB
*/
private static class FileLargeObject extends AbstractLargeObject {
/**
* Constructor
*
* @param file
*/
public FileLargeObject(
final File file
) {
super(asLength(file.length()));
this.file = file;
}
private transient File file;
/**
* Implements Serializable
*/
private static final long serialVersionUID = -1566865189136279414L;
/* (non-Javadoc)
* @see org.w3c.cci2.BinaryLargeObject#getContent()
*/
// @SuppressWarnings("resource")
public InputStream getContent(
) throws IOException {
return this.file != null ? new FileInputStream(this.file) : newContent();
}
}
//------------------------------------------------------------------------
// Class StreamLargeObject
//------------------------------------------------------------------------
/**
* The underlying stream may be retrieved once only
*/
public static class StreamLargeObject extends AbstractLargeObject {
/**
* Constructor
*
* @param stream
*/
public StreamLargeObject(
final InputStream stream
){
this(stream, getLength(stream));
}
/**
* Constructor
*
* @param stream
* @param length
*/
protected StreamLargeObject(
final InputStream stream,
final Long length
){
super(length);
this.stream = stream;
}
/**
* Implements Serializable
*/
private static final long serialVersionUID = -6473575658856881436L;
/**
* The stream may be read pnce only
*/
private transient InputStream stream;
/**
* Determine the large objetc's size
*
* @param stream
*
* @return the large objetc's size
*/
private static Long getLength(
InputStream stream
){
try {
return stream instanceof ByteArrayInputStream ? Long.valueOf(stream.available()) : null;
} catch (IOException exception) {
return null;
}
}
/* (non-Javadoc)
* @see org.w3c.cci2.BinaryLargeObject#getContent()
*/
public InputStream getContent(
) throws IOException {
InputStream content;
if(this.stream == null) {
content = newContent();
} else {
content = this.stream;
this.stream = null;
}
if(content != null) {
return content;
}
throw new IllegalStateException(
"The stream may be retrieved once only"
);
}
}
}
