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/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 2013-2014 sagyf Yang. The Four Group.
*/
package goja.core.kits.stream;
import com.jfinal.core.Const;
import java.io.*;
/**
* Optimized byte and character stream utilities.
*/
public class StreamUtil {
/**
* Default IO buffer size (16 KB).
*/
public static int ioBufferSize = 16384;
// ---------------------------------------------------------------- silent close
/**
* Closes an input stream and releases any system resources associated with
* this stream. No exception will be thrown if an I/O error occurs.
*/
public static void close(InputStream in) {
if (in != null) {
try {
in.close();
} catch (IOException ioex) {
// ignore
}
}
}
/**
* Closes an output stream and releases any system resources associated with
* this stream. No exception will be thrown if an I/O error occurs.
*/
public static void close(OutputStream out) {
if (out != null) {
try {
out.flush();
} catch (IOException ioex) {
// ignore
}
try {
out.close();
} catch (IOException ioex) {
// ignore
}
}
}
/**
* Closes a character-input stream and releases any system resources
* associated with this stream. No exception will be thrown if an I/O error
* occurs.
*/
public static void close(Reader in) {
if (in != null) {
try {
in.close();
} catch (IOException ioex) {
// ignore
}
}
}
/**
* Closes a character-output stream and releases any system resources
* associated with this stream. No exception will be thrown if an I/O error
* occurs.
*/
public static void close(Writer out) {
if (out != null) {
try {
out.flush();
} catch (IOException ioex) {
// ignore
}
try {
out.close();
} catch (IOException ioex) {
// ignore
}
}
}
// ---------------------------------------------------------------- copy
/**
* Copies input stream to output stream using buffer. Streams don't have
* to be wrapped to buffered, since copying is already optimized.
*/
public static int copy(InputStream input, OutputStream output) throws IOException {
byte[] buffer = new byte[ioBufferSize];
int count = 0;
int read;
while (true) {
read = input.read(buffer, 0, ioBufferSize);
if (read == -1) {
break;
}
output.write(buffer, 0, read);
count += read;
}
return count;
}
/**
* Copies specified number of bytes from input stream to output stream using buffer.
*/
public static int copy(InputStream input, OutputStream output, int byteCount) throws IOException {
byte buffer[] = new byte[ioBufferSize];
int count = 0;
int read;
while (byteCount > 0) {
if (byteCount < ioBufferSize) {
read = input.read(buffer, 0, byteCount);
} else {
read = input.read(buffer, 0, ioBufferSize);
}
if (read == -1) {
break;
}
byteCount -= read;
count += read;
output.write(buffer, 0, read);
}
return count;
}
/**
* Copies input stream to writer using buffer.
*/
public static void copy(InputStream input, Writer output) throws IOException {
copy(input, output, Const.DEFAULT_ENCODING);
}
/**
* Copies specified number of bytes from input stream to writer using buffer.
*/
public static void copy(InputStream input, Writer output, int byteCount) throws IOException {
copy(input, output, Const.DEFAULT_ENCODING, byteCount);
}
/**
* Copies input stream to writer using buffer and specified encoding.
*/
public static void copy(InputStream input, Writer output, String encoding) throws IOException {
copy(new InputStreamReader(input, encoding), output);
}
/**
* Copies specified number of bytes from input stream to writer using buffer and specified encoding.
*/
public static void copy(InputStream input, Writer output, String encoding, int byteCount) throws IOException {
copy(new InputStreamReader(input, encoding), output, byteCount);
}
/**
* Copies reader to writer using buffer.
* Streams don't have to be wrapped to buffered, since copying is already optimized.
*/
public static int copy(Reader input, Writer output) throws IOException {
char[] buffer = new char[ioBufferSize];
int count = 0;
int read;
while ((read = input.read(buffer, 0, ioBufferSize)) >= 0) {
output.write(buffer, 0, read);
count += read;
}
output.flush();
return count;
}
/**
* Copies specified number of characters from reader to writer using buffer.
*/
public static int copy(Reader input, Writer output, int charCount) throws IOException {
char buffer[] = new char[ioBufferSize];
int count = 0;
int read;
while (charCount > 0) {
if (charCount < ioBufferSize) {
read = input.read(buffer, 0, charCount);
} else {
read = input.read(buffer, 0, ioBufferSize);
}
if (read == -1) {
break;
}
charCount -= read;
count += read;
output.write(buffer, 0, read);
}
return count;
}
/**
* Copies reader to output stream using buffer.
*/
public static void copy(Reader input, OutputStream output) throws IOException {
copy(input, output, Const.DEFAULT_ENCODING);
}
/**
* Copies specified number of characters from reader to output stream using buffer.
*/
public static void copy(Reader input, OutputStream output, int charCount) throws IOException {
copy(input, output, Const.DEFAULT_ENCODING, charCount);
}
/**
* Copies reader to output stream using buffer and specified encoding.
*/
public static void copy(Reader input, OutputStream output, String encoding) throws IOException {
Writer out = new OutputStreamWriter(output, encoding);
copy(input, out);
out.flush();
}
/**
* Copies specified number of characters from reader to output stream using buffer and specified encoding.
*/
public static void copy(Reader input, OutputStream output, String encoding, int charCount) throws IOException {
Writer out = new OutputStreamWriter(output, encoding);
copy(input, out, charCount);
out.flush();
}
// ---------------------------------------------------------------- read bytes
/**
* Reads all available bytes from InputStream as a byte array.
* Uses in.available() to determine the size of input stream.
* This is the fastest method for reading input stream to byte array, but
* depends on stream implementation of available().
* Buffered internally.
*/
public static byte[] readAvailableBytes(InputStream in) throws IOException {
int l = in.available();
byte byteArray[] = new byte[l];
int i = 0, j;
while ((i < l) && (j = in.read(byteArray, i, l - i)) >= 0) {
i += j;
}
if (i < l) {
throw new IOException("Failed to completely read input stream");
}
return byteArray;
}
public static byte[] readBytes(InputStream input) throws IOException {
FastByteArrayOutputStream output = new FastByteArrayOutputStream();
copy(input, output);
return output.toByteArray();
}
public static byte[] readBytes(InputStream input, int byteCount) throws IOException {
FastByteArrayOutputStream output = new FastByteArrayOutputStream();
copy(input, output, byteCount);
return output.toByteArray();
}
public static byte[] readBytes(Reader input) throws IOException {
FastByteArrayOutputStream output = new FastByteArrayOutputStream();
copy(input, output);
return output.toByteArray();
}
public static byte[] readBytes(Reader input, int byteCount) throws IOException {
FastByteArrayOutputStream output = new FastByteArrayOutputStream();
copy(input, output, byteCount);
return output.toByteArray();
}
public static byte[] readBytes(Reader input, String encoding) throws IOException {
FastByteArrayOutputStream output = new FastByteArrayOutputStream();
copy(input, output, encoding);
return output.toByteArray();
}
public static byte[] readBytes(Reader input, String encoding, int byteCount) throws IOException {
FastByteArrayOutputStream output = new FastByteArrayOutputStream();
copy(input, output, encoding, byteCount);
return output.toByteArray();
}
// ---------------------------------------------------------------- read chars
public static char[] readChars(InputStream input) throws IOException {
FastCharArrayWriter output = new FastCharArrayWriter();
copy(input, output);
return output.toCharArray();
}
public static char[] readChars(InputStream input, int charCount) throws IOException {
FastCharArrayWriter output = new FastCharArrayWriter();
copy(input, output, charCount);
return output.toCharArray();
}
public static char[] readChars(InputStream input, String encoding) throws IOException {
FastCharArrayWriter output = new FastCharArrayWriter();
copy(input, output, encoding);
return output.toCharArray();
}
public static char[] readChars(InputStream input, String encoding, int charCount) throws IOException {
FastCharArrayWriter output = new FastCharArrayWriter();
copy(input, output, encoding, charCount);
return output.toCharArray();
}
public static char[] readChars(Reader input) throws IOException {
FastCharArrayWriter output = new FastCharArrayWriter();
copy(input, output);
return output.toCharArray();
}
public static char[] readChars(Reader input, int charCount) throws IOException {
FastCharArrayWriter output = new FastCharArrayWriter();
copy(input, output, charCount);
return output.toCharArray();
}
// ---------------------------------------------------------------- compare content
/**
* Compares the content of two byte streams.
*
* @return true if the content of the first stream is equal
* to the content of the second stream.
*/
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 != -1) {
int ch2 = input2.read();
if (ch != ch2) {
return false;
}
ch = input1.read();
}
int ch2 = input2.read();
return (ch2 == -1);
}
/**
* Compares the content of two character streams.
*
* @return true if the content of the first stream is equal
* to the content of the second stream.
*/
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 != -1) {
int ch2 = input2.read();
if (ch != ch2) {
return false;
}
ch = input1.read();
}
int ch2 = input2.read();
return (ch2 == -1);
}
}
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