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// Copyright (c) 2003-present, Jodd Team (http://jodd.org)
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
//
// 2. 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.
//
// 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 HOLDER 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 jodd.io;
import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.CharArrayWriter;
import java.io.Closeable;
import java.io.Flushable;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Reader;
import java.io.Writer;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
/**
* Optimized byte and character stream utilities.
*/
public class IOUtil {
/**
* Buffer size for various I/O operations.
*/
public static int ioBufferSize = 16384;
private static final int ZERO = 0;
private static final int NEGATIVE_ONE = -1;
private static final int ALL = -1;
// ---------------------------------------------------------------- silent close
/**
* Closes silently the closable object. If it is {@link Flushable}, it
* will be flushed first. No exception will be thrown if an I/O error occurs.
*/
public static void close(final Closeable closeable) {
if (closeable != null) {
if (closeable instanceof Flushable) {
try {
((Flushable) closeable).flush();
} catch (final IOException ignored) {
}
}
try {
closeable.close();
} catch (final IOException ignored) {
}
}
}
// ---------------------------------------------------------------- copy
/**
* Copies bytes from {@link Reader} to {@link Writer} using buffer.
* {@link Reader} and {@link Writer} don't have to be wrapped to buffered, since copying is already optimized.
*
* @param input {@link Reader} to read.
* @param output {@link Writer} to write to.
* @return The total number of characters read.
* @throws IOException if there is an error reading or writing.
*/
public static int copy(final Reader input, final Writer output) throws IOException {
final int numToRead = bufferSize();
final char[] buffer = new char[numToRead];
int totalRead = ZERO;
int read;
while ((read = input.read(buffer, ZERO, numToRead)) >= ZERO) {
output.write(buffer, ZERO, read);
totalRead = totalRead + read;
}
output.flush();
return totalRead;
}
/**
* Copies bytes from {@link InputStream} to {@link OutputStream} using buffer.
* {@link InputStream} and {@link OutputStream} don't have to be wrapped to buffered,
* since copying is already optimized.
*
* @param input {@link InputStream} to read.
* @param output {@link OutputStream} to write to.
* @return The total number of bytes read.
* @throws IOException if there is an error reading or writing.
*/
public static int copy(final InputStream input, final OutputStream output) throws IOException {
final int numToRead = bufferSize();
final byte[] buffer = new byte[numToRead];
int totalRead = ZERO;
int read;
while ((read = input.read(buffer, ZERO, numToRead)) >= ZERO) {
output.write(buffer, ZERO, read);
totalRead = totalRead + read;
}
output.flush();
return totalRead;
}
/**
* Copies specified number of characters from {@link Reader} to {@link Writer} using buffer.
* {@link Reader} and {@link Writer} don't have to be wrapped to buffered, since copying is already optimized.
*
* @param input {@link Reader} to read.
* @param output {@link Writer} to write to.
* @param count The number of characters to read.
* @return The total number of characters read.
* @throws IOException if there is an error reading or writing.
*/
public static int copy(final Reader input, final Writer output, final int count) throws IOException {
if (count == ALL) {
return copy(input, output);
}
int numToRead = count;
final char[] buffer = new char[numToRead];
int totalRead = ZERO;
int read;
while (numToRead > ZERO) {
read = input.read(buffer, ZERO, bufferSize(numToRead));
if (read == NEGATIVE_ONE) {
break;
}
output.write(buffer, ZERO, read);
numToRead = numToRead - read;
totalRead = totalRead + read;
}
output.flush();
return totalRead;
}
/**
* Copies specified number of bytes from {@link InputStream} to {@link OutputStream} using buffer.
* {@link InputStream} and {@link OutputStream} don't have to be wrapped to buffered, since copying is already optimized.
*
* @param input {@link InputStream} to read.
* @param output {@link OutputStream} to write to.
* @param count The number of bytes to read.
* @return The total number of bytes read.
* @throws IOException if there is an error reading or writing.
*/
public static int copy(final InputStream input, final OutputStream output, final int count) throws IOException {
if (count == ALL) {
return copy(input, output);
}
int numToRead = count;
final byte[] buffer = new byte[numToRead];
int totalRead = ZERO;
int read;
while (numToRead > ZERO) {
read = input.read(buffer, ZERO, bufferSize(numToRead));
if (read == NEGATIVE_ONE) {
break;
}
output.write(buffer, ZERO, read);
numToRead = numToRead - read;
totalRead = totalRead + read;
}
output.flush();
return totalRead;
}
// ---------------------------------------------------------------- read bytes
/**
* Reads all available bytes from {@link InputStream} as a byte array.
* Uses {@link InputStream#available()} to determine the size of input stream.
* This is the fastest method for reading {@link InputStream} to byte array, but
* depends on {@link InputStream} implementation of {@link InputStream#available()}.
*
* @param input {@link InputStream} to read.
* @return byte[]
* @throws IOException if total read is less than {@link InputStream#available()};
*/
public static byte[] readAvailableBytes(final InputStream input) throws IOException {
final int numToRead = input.available();
final byte[] buffer = new byte[numToRead];
int totalRead = ZERO;
int read;
while ((totalRead < numToRead) && (read = input.read(buffer, totalRead, numToRead - totalRead)) >= ZERO) {
totalRead = totalRead + read;
}
if (totalRead < numToRead) {
throw new IOException("Failed to completely read InputStream");
}
return buffer;
}
// ---------------------------------------------------------------- copy to OutputStream
/**
* @see #copy(Reader, OutputStream, Charset)
*/
public static T copy(final Reader input, final T output) throws IOException {
return copy(input, output, encoding());
}
/**
* @see #copy(Reader, OutputStream, Charset, int)
*/
public static T copy(final Reader input, final T output, final int count) throws IOException {
return copy(input, output, encoding(), count);
}
/**
* @see #copy(Reader, OutputStream, Charset, int)
*/
public static T copy(final Reader input, final T output, final Charset encoding) throws IOException {
return copy(input, output, encoding, ALL);
}
/**
* Copies {@link Reader} to {@link OutputStream} using buffer and specified encoding.
*
* @see #copy(Reader, Writer, int)
*/
public static T copy(final Reader input, final T output, final Charset encoding, final int count) throws IOException {
try (final Writer out = outputStreamWriterOf(output, encoding)) {
copy(input, out, count);
return output;
}
}
/**
* @see #copyToOutputStream(InputStream, int)
*/
public static ByteArrayOutputStream copyToOutputStream(final InputStream input) throws IOException {
return copyToOutputStream(input, ALL);
}
/**
* Copies {@link InputStream} to a new {@link ByteArrayOutputStream} using buffer and specified encoding.
*
* @see #copy(InputStream, OutputStream, int)
*/
public static ByteArrayOutputStream copyToOutputStream(final InputStream input, final int count) throws IOException {
try (final ByteArrayOutputStream output = createFastByteArrayOutputStream()) {
copy(input, output, count);
return output;
}
}
/**
* @see #copyToOutputStream(Reader, Charset)
*/
public static ByteArrayOutputStream copyToOutputStream(final Reader input) throws IOException {
return copyToOutputStream(input, encoding());
}
/**
* @see #copyToOutputStream(Reader, Charset, int)
*/
public static ByteArrayOutputStream copyToOutputStream(final Reader input, final Charset encoding) throws IOException {
return copyToOutputStream(input, encoding, ALL);
}
/**
* @see #copyToOutputStream(Reader, Charset, int)
*/
public static ByteArrayOutputStream copyToOutputStream(final Reader input, final int count) throws IOException {
return copyToOutputStream(input, encoding(), count);
}
/**
* Copies {@link Reader} to a new {@link ByteArrayOutputStream} using buffer and specified encoding.
*
* @see #copy(Reader, OutputStream, Charset, int)
*/
public static ByteArrayOutputStream copyToOutputStream(final Reader input, final Charset encoding, final int count) throws IOException {
try (final ByteArrayOutputStream output = createFastByteArrayOutputStream()) {
copy(input, output, encoding, count);
return output;
}
}
// ---------------------------------------------------------------- copy to Writer
/**
* @see #copy(InputStream, Writer, Charset)
*/
public static T copy(final InputStream input, final T output) throws IOException {
return copy(input, output, encoding());
}
/**
* @see #copy(InputStream, Writer, Charset, int)
*/
public static T copy(final InputStream input, final T output, final int count) throws IOException {
return copy(input, output, encoding(), count);
}
/**
* @see #copy(InputStream, Writer, Charset, int)
*/
public static T copy(final InputStream input, final T output, final Charset encoding) throws IOException {
return copy(input, output, encoding, ALL);
}
/**
* Copies {@link InputStream} to {@link Writer} using buffer and specified encoding.
*
* @see #copy(Reader, Writer, int)
*/
public static T copy(final InputStream input, final T output, final Charset encoding, final int count) throws IOException {
copy(inputStreamReadeOf(input, encoding), output, count);
return output;
}
/**
* @see #copy(InputStream, Charset)
*/
public static CharArrayWriter copy(final InputStream input) throws IOException {
return copy(input, encoding());
}
/**
* @see #copy(InputStream, Charset, int)
*/
public static CharArrayWriter copy(final InputStream input, final int count) throws IOException {
return copy(input, encoding(), count);
}
/**
* @see #copy(InputStream, Charset, int)
*/
public static CharArrayWriter copy(final InputStream input, final Charset encoding) throws IOException {
return copy(input, encoding, ALL);
}
/**
* Copies {@link InputStream} to a new {@link CharArrayWriter} using buffer and specified encoding.
*
* @see #copy(InputStream, Writer, Charset, int)
*/
public static CharArrayWriter copy(final InputStream input, final Charset encoding, final int count) throws IOException {
try (final CharArrayWriter output = createFastCharArrayWriter()) {
copy(input, output, encoding, count);
return output;
}
}
/**
* @see #copy(Reader, int)
*/
public static CharArrayWriter copy(final Reader input) throws IOException {
return copy(input, ALL);
}
/**
* Copies {@link Reader} to a new {@link CharArrayWriter} using buffer and specified encoding.
*
* @see #copy(Reader, Writer, int)
*/
public static CharArrayWriter copy(final Reader input, final int count) throws IOException {
try (final CharArrayWriter output = createFastCharArrayWriter()) {
copy(input, output, count);
return output;
}
}
// ---------------------------------------------------------------- read bytes
/**
* @see #readBytes(InputStream, int)
*/
public static byte[] readBytes(final InputStream input) throws IOException {
return readBytes(input, ALL);
}
/**
* @see #copyToOutputStream(InputStream, int)
*/
public static byte[] readBytes(final InputStream input, final int count) throws IOException {
return copyToOutputStream(input, count).toByteArray();
}
/**
* @see #readBytes(Reader, Charset)
*/
public static byte[] readBytes(final Reader input) throws IOException {
return readBytes(input, encoding());
}
/**
* @see #readBytes(Reader, Charset, int)
*/
public static byte[] readBytes(final Reader input, final int count) throws IOException {
return readBytes(input, encoding(), count);
}
/**
* @see #readBytes(Reader, Charset, int)
*/
public static byte[] readBytes(final Reader input, final Charset encoding) throws IOException {
return readBytes(input, encoding, ALL);
}
/**
* @see #copyToOutputStream(Reader, Charset, int)
*/
public static byte[] readBytes(final Reader input, final Charset encoding, final int count) throws IOException {
return copyToOutputStream(input, encoding, count).toByteArray();
}
// ---------------------------------------------------------------- read chars
/**
* @see #readChars(Reader, int)
*/
public static char[] readChars(final Reader input) throws IOException {
return readChars(input, ALL);
}
/**
* @see #copy(Reader, int)
*/
public static char[] readChars(final Reader input, final int count) throws IOException {
return copy(input, count).toCharArray();
}
/**
* @see #readChars(InputStream, int)
*/
public static char[] readChars(final InputStream input) throws IOException {
return readChars(input, ALL);
}
/**
* @see #readChars(InputStream, Charset, int)
*/
public static char[] readChars(final InputStream input, final Charset encoding) throws IOException {
return readChars(input, encoding, ALL);
}
/**
* @see #readChars(InputStream, Charset, int)
*/
public static char[] readChars(final InputStream input, final int count) throws IOException {
return readChars(input, encoding(), count);
}
/**
* @see #copy(InputStream, Charset, int)
*/
public static char[] readChars(final InputStream input, final Charset encoding, final int count) throws IOException {
return copy(input, encoding, count).toCharArray();
}
// ---------------------------------------------------------------- compare content
/**
* Compares the content of two byte streams ({@link InputStream}s).
*
* @return {@code true} if the content of the first {@link InputStream} is equal
* to the content of the second {@link InputStream}.
*/
public static boolean compare(InputStream input1, InputStream input2) throws IOException {
if (!(input1 instanceof BufferedInputStream)) {
input1 = new BufferedInputStream(input1);
}
if (!(input2 instanceof BufferedInputStream)) {
input2 = new BufferedInputStream(input2);
}
int ch = input1.read();
while (ch != NEGATIVE_ONE) {
final int ch2 = input2.read();
if (ch != ch2) {
return false;
}
ch = input1.read();
}
final int ch2 = input2.read();
return (ch2 == NEGATIVE_ONE);
}
/**
* Compares the content of two character streams ({@link Reader}s).
*
* @return {@code true} if the content of the first {@link Reader} is equal
* to the content of the second {@link Reader}.
*/
public static boolean compare(Reader input1, Reader input2) throws IOException {
if (!(input1 instanceof BufferedReader)) {
input1 = new BufferedReader(input1);
}
if (!(input2 instanceof BufferedReader)) {
input2 = new BufferedReader(input2);
}
int ch = input1.read();
while (ch != NEGATIVE_ONE) {
final int ch2 = input2.read();
if (ch != ch2) {
return false;
}
ch = input1.read();
}
final int ch2 = input2.read();
return (ch2 == NEGATIVE_ONE);
}
// ---------------------------------------------------------------- defaults
/**
* Returns default IO buffer size.
*
* @return default IO buffer size.
*/
private static int bufferSize() {
return ioBufferSize;
}
/**
* Returns either count or default IO buffer size (whichever is smaller).
*
* @param count Number of characters or bytes to retrieve.
* @return buffer size (either count or default IO buffer size, whichever is smaller).
*/
private static int bufferSize(final int count) {
final int ioBufferSize = IOUtil.ioBufferSize;
return Math.min(count, ioBufferSize);
}
/**
* Returns default encoding.
*/
private static Charset encoding() {
return StandardCharsets.UTF_8;
}
// ---------------------------------------------------------------- wrappers
/**
* Returns new {@link CharArrayWriter} using default IO buffer size.
*
* @return new {@link CharArrayWriter} using default IO buffer size.
*/
private static CharArrayWriter createFastCharArrayWriter() {
return new CharArrayWriter(bufferSize());
}
private static ByteArrayOutputStream createFastByteArrayOutputStream() {
return new ByteArrayOutputStream(bufferSize());
}
/**
* @see #inputStreamReadeOf(InputStream, Charset)
*/
public static InputStreamReader inputStreamReadeOf(final InputStream input) {
return inputStreamReadeOf(input, encoding());
}
/**
* Returns new {@link InputStreamReader} using specified {@link InputStream} and encoding.
*
* @param input {@link InputStream}
* @param encoding Encoding as {@link String} to use for {@link InputStreamReader}.
* @return new {@link InputStreamReader}
*/
public static InputStreamReader inputStreamReadeOf(final InputStream input, final Charset encoding) {
return new InputStreamReader(input, encoding);
}
/**
* @see #outputStreamWriterOf(OutputStream, Charset)
*/
public static OutputStreamWriter outputStreamWriterOf(final OutputStream output) {
return outputStreamWriterOf(output, encoding());
}
/**
* Returns new {@link OutputStreamWriter} using specified {@link OutputStream} and encoding.
*
* @param output {@link OutputStream}
* @param encoding Encoding as {@link String} to use for {@link OutputStreamWriter}.
* @return new {@link OutputStreamWriter}
*/
public static OutputStreamWriter outputStreamWriterOf(final OutputStream output, final Charset encoding) {
return new OutputStreamWriter(output, encoding);
}
}
