org.hsqldb.lib.InOutUtil Maven / Gradle / Ivy
/* Copyright (c) 2001-2011, The HSQL Development Group
* 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 HSQL Development Group 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 HSQL DEVELOPMENT GROUP, HSQLDB.ORG,
* 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.
*/
package org.hsqldb.lib;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.OutputStream;
import java.io.Reader;
import java.io.Serializable;
import java.io.Writer;
/**
* Input / Output utility
*
* @author Fred Toussi (fredt@users dot sourceforge.net)
* @author Campbell Boucher-Burnet (boucherb@users dot sourceforge.net)
* @version 2.1
* @revised 1.8.0
* @since 1.7.2
*/
public final class InOutUtil {
/**
* Implementation only supports unix line-end format and is suitable for
* processing HTTP and other network protocol communications. Reads and writes
* a line of data. Returns the number of bytes read/written.
*/
public static int readLine(InputStream in,
OutputStream out) throws IOException {
int count = 0;
for (;;) {
int b = in.read();
if (b == -1) {
break;
}
count++;
out.write(b);
if (b == '\n') {
break;
}
}
return count;
}
/**
* Retrieves the serialized form of the specified Object
* as an array of bytes.
*
* @param s the Object to serialize
* @return a static byte array representing the passed Object
*/
public static byte[] serialize(Serializable s) throws IOException {
HsqlByteArrayOutputStream bo = new HsqlByteArrayOutputStream();
ObjectOutputStream os = new ObjectOutputStream(bo);
os.writeObject(s);
return bo.toByteArray();
}
/**
* Deserializes the specified byte array to an
* Object instance.
*
* @return the Object resulting from deserializing the specified array of bytes
* @param ba the byte array to deserialize to an Object
*/
public static Serializable deserialize(byte[] ba)
throws IOException, ClassNotFoundException {
HsqlByteArrayInputStream bi = new HsqlByteArrayInputStream(ba);
ObjectInputStream is = new ObjectInputStream(bi);
return (Serializable) is.readObject();
}
public static final int DEFAULT_COPY_BUFFER_SIZE = 8192;
public static final long DEFAULT_COPY_AMOUNT = Long.MAX_VALUE;
/**
* @see #copy(java.io.InputStream, java.io.OutputStream, long, int)
*/
public static long copy(
final InputStream inputStream,
final OutputStream outputStream) throws IOException {
return copy(inputStream, outputStream,
DEFAULT_COPY_AMOUNT,
DEFAULT_COPY_BUFFER_SIZE);
}
/**
* @see #copy(java.io.InputStream, java.io.OutputStream, long, int)
*/
public static long copy(
final InputStream inputStream,
final OutputStream outputStream,
final long amount) throws IOException {
return copy(inputStream, outputStream, amount,
DEFAULT_COPY_BUFFER_SIZE);
}
/**
* the specified amount from the given input stream to the
* given output stream, using a buffer of the given size.
*
* @param inputStream from which to source bytes
* @param outputStream to which to sink bytes
* @param amount max # of bytes to transfer.
* @param bufferSize to use internally
* @return the number of bytes actually transfered.
* @throws IOException if any, thrown by either of the given stream objects
*/
public static long copy(
final InputStream inputStream,
final OutputStream outputStream,
final long amount,
final int bufferSize) throws IOException {
//
int maxBytesToRead = (int) Math.min((long) bufferSize, amount);
//
final byte[] buffer = new byte[maxBytesToRead];
//
long bytesCopied = 0;
int bytesRead;
while ((bytesCopied < amount) && -1 != (bytesRead =
inputStream.read(buffer, 0, maxBytesToRead))) {
//
outputStream.write(buffer, 0, bytesRead);
if (bytesRead > Long.MAX_VALUE - bytesCopied) {
// edge case...
// extremely unlikely but included for 'correctness'
bytesCopied = Long.MAX_VALUE;
} else {
bytesCopied += bytesRead;
}
if (bytesCopied >= amount) {
return bytesCopied;
}
maxBytesToRead = (int) Math.min((long) bufferSize,
amount - bytesCopied);
}
return bytesCopied;
}
/**
* @see #copy(java.io.Reader, java.io.Writer, long, int)
*/
public static long copy(
final Reader reader,
final Writer writer) throws IOException {
return copy(reader, writer,
DEFAULT_COPY_AMOUNT,
DEFAULT_COPY_BUFFER_SIZE);
}
/**
* @see #copy(java.io.Reader, java.io.Writer, long, int)
*/
public static long copy(
final Reader reader,
final Writer writer,
final long amount) throws IOException {
return copy(reader, writer, amount,
DEFAULT_COPY_BUFFER_SIZE);
}
/**
* the specified amount from the given input stream to the
* given output stream, using a buffer of the given size.
*
* @param reader from which to source characters
* @param writer to which to sink characters
* @param amount max # of characters to transfer.
* @param bufferSize to use internally
* @return the number of characters actually transfered.
* @throws IOException if any, thrown by either of the given stream objects
*/
public static long copy(
final Reader reader,
final Writer writer,
final long amount,
final int bufferSize) throws IOException {
//
int maxCharsToRead = (int) Math.min((long) bufferSize, amount);
//
final char[] buffer = new char[maxCharsToRead];
//
long charsCopied = 0;
int charsRead;
while ((charsCopied < amount) && -1 != (charsRead =
reader.read(buffer, 0, maxCharsToRead))) {
//
writer.write(buffer, 0, charsRead);
if (charsRead > Long.MAX_VALUE - charsCopied) {
// edge case...
// extremely unlikely but included for 'correctness'
charsCopied = Long.MAX_VALUE;
} else {
charsCopied += charsRead;
}
if (charsCopied >= amount) {
return charsCopied;
}
maxCharsToRead = (int) Math.min((long) bufferSize,
amount - charsCopied);
}
return charsCopied;
}
}
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