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/*
* ====================================================================
* Project: openMDX, http://www.openmdx.org/
* Description: Object Relational Mapping
* 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.CharArrayReader;
import java.io.CharArrayWriter;
import java.io.EOFException;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Reader;
import java.io.Serializable;
import java.io.StringReader;
import java.io.Writer;
import java.net.URL;
import java.net.URLConnection;
/**
* Object Relational Mapping
*/
public class CharacterLargeObjects {
/**
* Constructor
*/
private CharacterLargeObjects() {
// To avoid instantiation
}
/**
* Default capacity for stream copy
*/
private final static int CAPACITY = 10000;
/**
* Create a CharacterLargeObject facade for the given string
*
* @param source
*
* @return a CharacterLargeObject facade for the given string
*/
public static CharacterLargeObject valueOf(
String source
){
return new StringLargeObject(source);
}
/**
* Create a CharacterLargeObject facade for the given byte array
*
* @param source
*
* @return a CharacterLargeObject facade for the given byte array
*/
public static CharacterLargeObject valueOf(
char[] source
){
return new ArrayLargeObject(source);
}
/**
* Create a CharacterLargeObject facade for the given URL
*
* @param source
*
* @return a CharacterLargeObject facade for the given URL
*/
public static CharacterLargeObject valueOf(
URL source
){
return new URLLargeObject(source);
}
/**
* Create a CharacterLargeObject facade for the given file
*
* @param source the file to be read
* @param encoding the file's the character encoding
*
* @return a CharacterLargeObject facade for the given file
*/
public static CharacterLargeObject valueOf(
File source,
String encoding
){
return new FileLargeObject(source, encoding);
}
/**
* Create a CharacterLargeObject facade for the given stream
*
* @param source
*
* @return a CharacterLargeObject facade for the given stream
*/
public static CharacterLargeObject valueOf(
Reader source
){
return new StreamLargeObject(source);
}
/**
* Create a CharacterLargeObject facade for the given stream
*
* @param source
* @param length
*
* @return a CharacterLargeObject facade for the given stream
*/
public static CharacterLargeObject valueOf(
Reader source,
Long length
){
return new StreamLargeObject(source, length);
}
/**
* Create a CharacterLargeObject copy of the given stream
*
* @param source
* @param length
*
* @return a CharacterLargeObject copy of the given stream
*
* @throws IOException
*/
public static CharacterLargeObject copyOf(
Reader source,
Long length
) throws IOException {
CharArrayWriter buffer = length == null ? new CharArrayWriter(
) : new CharArrayWriter(
length.intValue()
);
streamCopy(source, 0, buffer);
return valueOf(buffer.toCharArray());
}
/**
* 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 a reader's content to a writer
*
* @param source
* @param position
* @param target
*
* @return the number of character's written to the writer
*
* @throws IOException
*/
public static long streamCopy(
Reader source,
long position,
Writer target
) throws IOException {
char[] buffer = new char[CAPACITY];
if(position != 0l) {
source.skip(position);
}
long count = 0l;
for(int i; (i = source.read(buffer)) >= 0;){
count += i;
target.write(buffer, 0, i);
}
return count;
}
//------------------------------------------------------------------------
// Class StringLargeObject
//------------------------------------------------------------------------
/**
* String CLOB
*/
private static class StringLargeObject implements CharacterLargeObject {
/**
* Constructor
*
* @param value
*/
StringLargeObject(
String value
) {
this.value = value;
}
/**
*
*/
final String value;
/* (non-Javadoc)
* @see org.w3c.cci2.CharacterLargeObject#getContent()
*/
public Reader getContent(
) throws IOException {
return new StringReader(this.value);
}
/* (non-Javadoc)
* @see org.w3c.cci2.CharacterLargeObject#getContent(java.io.Writer, long)
*/
public void getContent(
Writer writer,
long position
) throws IOException {
writer.write(this.value, (int)position, this.value.length() - (int)position);
}
/* (non-Javadoc)
* @see org.w3c.cci2.LargeObject#getLength()
*/
public Long getLength(
) throws IOException {
return Long.valueOf(this.value.length());
}
}
//------------------------------------------------------------------------
// Class ArrayLargeObject
//------------------------------------------------------------------------
/**
* Array CLOB
*/
private static class ArrayLargeObject implements CharacterLargeObject, Serializable {
/**
* Constructor
*
* @param value
*/
public ArrayLargeObject(final char[] value) {
this.value = value;
}
/**
* Implements Serializable
*/
private static final long serialVersionUID = -9096693393561649452L;
/**
*
*/
private final char[] value;
/* (non-Javadoc)
* @see org.w3c.cci2.LargeObject#getLength()
*/
public Long getLength(
){
return Long.valueOf(this.value.length);
}
/* (non-Javadoc)
* @see org.w3c.cci2.CharacterLargeObject#getContent()
*/
public Reader getContent(
){
return new CharArrayReader(this.value);
}
/* (non-Javadoc)
* @see org.w3c.cci2.CharacterLargeObject#getContent(java.io.Writer, long)
*/
public void getContent(
Writer writer,
long position
) throws IOException {
int length = (int) (this.value.length - position);
if(length < 0) throw new EOFException(
"Position " + position + " is larger than the objects length " + this.value.length
);
writer.write(this.value, (int) position, length);
}
}
//------------------------------------------------------------------------
// Class AbstractLargeObject
//------------------------------------------------------------------------
/**
* The underlying stream may be retrieved once only
*/
private static abstract class AbstractLargeObject implements CharacterLargeObject, Serializable {
/**
* Constructor
*
* @param stream
*/
protected AbstractLargeObject(
Long length
){
this.length = length;
}
/**
* Implements Serializable
*/
private static final long serialVersionUID = -5837819381102619869L;
private transient char[] value;
private transient Long length;
/**
* Provide the input stream content
*
* @return the content
*
* @throws IOException
*/
protected Reader newContent(
) throws IOException {
return this.value == null ? null : new CharArrayReader(this.value);
}
/* (non-Javadoc)
* @see org.w3c.cci2.BinaryLargeObject#getContent(java.io.OutputStream, long)
*/
public void getContent(
Writer 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;
}
private void writeObject(
ObjectOutputStream stream
) throws IOException {
if(value == null) {
CharArrayWriter buffer = new CharArrayWriter();
getContent(buffer, 0);
stream.writeObject(buffer.toCharArray());
} else {
stream.writeObject(this.value);
}
}
private void readObject(
ObjectInputStream stream
) throws IOException, ClassNotFoundException {
this.value = (char[]) stream.readObject();
this.length = Long.valueOf(value.length);
}
}
//------------------------------------------------------------------------
// Class URLLargeObject
//------------------------------------------------------------------------
/**
* URL CLOB
*/
private static class URLLargeObject extends AbstractLargeObject {
/**
* Constructor
*
* @param value
*/
public URLLargeObject(final URL url) {
super(null);
this.url = url;
}
/**
*
*/
private static final long serialVersionUID = -4494073113239913907L;
/**
*
*/
private transient URL url;
/**
*
*/
private transient URLConnection connection;
/* (non-Javadoc)
* @see org.w3c.cci2.CharacterLargeObject#getContent()
*/
@Override
public Reader getContent() throws IOException {
if(this.url == null) {
return newContent();
} else {
URLConnection connection = getConnection();
String encoding = connection.getContentEncoding();
InputStream stream = connection.getInputStream();
return encoding == null ? new InputStreamReader(
stream
) : new InputStreamReader(
stream,
encoding
);
}
}
/**
* 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 CLOB
*/
private static class FileLargeObject extends AbstractLargeObject {
/**
* Constructor
*
* @param file the file to be read
* @param encoding the encoding to be used
*/
public FileLargeObject(
File file,
String encoding
) {
super(null);
this.file = file;
this.encoding = encoding;
}
/**
*
*/
private static final long serialVersionUID = 2452652537639826230L;
/**
*
*/
private transient File file;
/**
* The file's encoding
*/
private transient String encoding;
/* (non-Javadoc)
* @see org.w3c.cci2.CharacterLargeObject#getContent()
*/
// @SuppressWarnings("resource")
public Reader getContent(
) throws IOException {
return this.file != null ? new InputStreamReader(
new FileInputStream(this.file),
encoding
) : this.newContent();
}
}
//------------------------------------------------------------------------
// Class StreamLargeObject
//------------------------------------------------------------------------
/**
* The underlying stream may be retrieved once only
*/
public static class StreamLargeObject extends AbstractLargeObject {
/**
* Constructor
*
* @param stream
*/
public StreamLargeObject(
final Reader stream
){
this(
stream,
getLength(stream)
);
}
/**
* Constructor
*
* @param stream
*/
protected StreamLargeObject(
final Reader stream,
Long length
){
super(length);
this.stream = stream;
}
/**
*
*/
private static final long serialVersionUID = -7462838546162808783L;
/**
*
*/
private transient Reader stream;
/**
* Determine the large objetc's size
*
* @param stream
*
* @return the large objetc's size
*/
private static Long getLength(
Reader stream
){
return null; // generally undeterminable
}
/* (non-Javadoc)
* @see org.w3c.cci2.BinaryLargeObject#getContent()
*/
public Reader getContent(
) throws IOException {
if(this.stream == null) {
return newContent();
} else {
Reader stream = this.stream;
this.stream = null;
return stream;
}
}
}
}
