Java Utililty Methods File Read via ByteBuffer

List of utility methods to do File Read via ByteBuffer

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Description

The list of methods to do File Read via ByteBuffer are organized into topic(s).

Method

booleanreadDouble(BufferedReader br, double[] buf)
Reads doubles from ASCII stream 
String line = br.readLine();
if (line == null)
    return false;
String[] tokens = line.trim().split("\\s+");
if (tokens.length != buf.length)
    return false;
for (int i = 0; i < tokens.length; ++i)
    buf[i] = Double.valueOf(tokens[i]);
...
doublereadDouble(byte[] src, int pointer)
read Double 
return Double.longBitsToDouble(readLong(src, pointer));
doublereadDouble(FileChannel fileChannel, ByteOrder byteOrder)
read Double 
ByteBuffer byteBuffer = ByteBuffer.allocate(8);
byteBuffer.order(byteOrder);
fileChannel.read(byteBuffer);
return byteBuffer.getDouble(0);
doublereadDouble(final byte[] bytes, final int length, final int offset)
Returns a double representing the bytes. 
double output = -1d;
if (bytes == null) {
    return output;
final byte[] doubleBytes = new byte[length];
for (int i = 0; i < doubleBytes.length; i++) {
    doubleBytes[i] = bytes[offset + i];
output = ByteBuffer.wrap(doubleBytes).getDouble();
return output;
java.nio.ByteBufferreadEntireFile(java.io.File file)
read Entire File 
return readFileToBuffer(file);
StringreaderToString(Reader reader)
Read all data from the given reader into a buffer and return it as a single String. 
assert reader != null;
StringWriter strWriter = new StringWriter();
char[] buffer = new char[65536];
int charsRead = reader.read(buffer);
while (charsRead > 0) {
    strWriter.write(buffer, 0, charsRead);
    charsRead = reader.read(buffer);
reader.close();
return strWriter.toString();
float[]readFC(String fname, int length)
read FC 
float[] res = new float[length];
FileChannel inChannel = new RandomAccessFile(fname, "rw").getChannel();
ByteBuffer buffer = ByteBuffer.allocate(4 * res.length);
inChannel.read(buffer);
buffer.flip();
FloatBuffer buffer2 = buffer.asFloatBuffer();
for (int i = 0; i < res.length; i++) {
    res[i] = buffer2.get(i);
...
StringreadFile(File file)
read File 
if (!file.exists() || file.isDirectory() || !file.canRead()) {
    return null;
FileInputStream fileInputStream = new FileInputStream(file);
return readFile(fileInputStream);
ByteBufferreadFile(File file)
read File 
byte[] buffer = new byte[(int) file.length()];
int bytesRead;
try (FileInputStream fileReader = new FileInputStream(file)) {
    bytesRead = fileReader.read(buffer);
assert bytesRead == file.length() : file;
return ByteBuffer.wrap(buffer);
CharBufferreadFile(File file)
Read the file contents of the given file using the default character set. 
FileChannel channel = null;
FileInputStream stream = null;
try {
    stream = new FileInputStream(file);
    channel = stream.getChannel();
    ByteBuffer byteBuffer = channel.map(FileChannel.MapMode.READ_ONLY, 0, channel.size());
    CharBuffer charBuffer = Charset.defaultCharset().newDecoder().decode(byteBuffer);
    return charBuffer;
...