Java FastBufferedInputStream.position方法代码示例

import it.unimi.dsi.fastutil.io.FastBufferedInputStream; //导入方法依赖的package包/类
public MutableString get(final int index, final FastBufferedInputStream fastBufferedInputStream, final ByteBuffer byteBuffer, final CharBuffer charBuffer, final CharsetDecoder decoder) {
	try {
		fastBufferedInputStream.position(borders.getLong(index));
		byteBuffer.clear();
		byteBuffer.limit(fastBufferedInputStream.readLine(byteBuffer.array(), terminators));
		charBuffer.clear();
		decoder.decode(byteBuffer, charBuffer, true);
		return new MutableString(charBuffer.array(), 0, charBuffer.position());
	}
	catch (final IOException e) {
		throw new RuntimeException(e);
	}
}
 

import it.unimi.dsi.fastutil.io.FastBufferedInputStream; //导入方法依赖的package包/类
public MutableString get(final long index, final FastBufferedInputStream fastBufferedInputStream, final ByteBuffer byteBuffer, final CharBuffer charBuffer, final CharsetDecoder decoder) {
	try {
		fastBufferedInputStream.position(borders.getLong(index));
		byteBuffer.clear();
		byteBuffer.limit(fastBufferedInputStream.readLine(byteBuffer.array(), terminators));
		charBuffer.clear();
		decoder.decode(byteBuffer, charBuffer, true);
		return new MutableString(charBuffer.array(), 0, charBuffer.position());
	}
	catch (final IOException e) {
		throw new RuntimeException(e);
	}
}
 

import it.unimi.dsi.fastutil.io.FastBufferedInputStream; //导入方法依赖的package包/类
@SuppressWarnings("resource")
public void testRandom( int bufferSize ) throws IOException {
	File temp = File.createTempFile( this.getClass().getSimpleName(), "tmp" );
	temp.deleteOnExit();
	
	// Create temp random file
	FileOutputStream out = new FileOutputStream( temp );
	Random random = new Random();
	int length = 100000 + random.nextInt( 10000 );
	for( int i = 0; i < length; i++ ) out.write( random.nextInt() );
	out.close();

	FastBufferedInputStream bis = new FastBufferedInputStream( new FileInputStream( temp ), bufferSize );
	FileInputStream test = new FileInputStream( temp );
	FileChannel fc = test.getChannel();
	int a1, a2, off, len, pos;
	byte b1[] = new byte[ 32768 ];
	byte b2[] = new byte[ 32768 ];

	while( true ) {

		switch( random.nextInt( 6 ) ) {

		case 0:
			if ( DEBUG ) System.err.println("read()");
			a1 = bis.read();
			a2 = test.read();
			assertEquals( a1, a2 );
			if ( a1 == -1 ) return;
			break;

		case 1:
			off = random.nextInt( b1.length );
			len = random.nextInt( b1.length - off + 1 );
			a1 = bis.read( b1, off, len );
			a2 = test.read( b2, off, len );
			if ( DEBUG ) System.err.println("read(b, " + off + ", " + len + ")");

			assertEquals( a1, a2 );

			for( int i = off; i < off + len; i++ ) assertEquals( "Position " + i, b1[ i ], b2[ i ] );
			break;

		case 2:
			if ( DEBUG ) System.err.println("available()");
			assertEquals( bis.available(), test.available() );
			break;

		case 3:
			if ( DEBUG ) System.err.println("position()" );
			pos = (int)bis.position();
			assertEquals( (int)fc.position(), pos );
			break;

		case 4:
			pos = random.nextInt( length );
			bis.position( pos );
			if ( DEBUG ) System.err.println("position(" + pos + ")" );
			(test = new FileInputStream( temp )).skip( pos );
			fc = test.getChannel();
			break;

		case 5:
			pos = random.nextInt( (int)(length - bis.position() + 1) );
			a1 = (int)bis.skip( pos );
			a2 = (int)test.skip( pos );
			if ( DEBUG ) System.err.println("skip(" + pos + ")" );
			assertEquals( a1, a2 );
			break;
		}
	}

}
 

import it.unimi.dsi.fastutil.io.FastBufferedInputStream; //导入方法依赖的package包/类
/** Creates a file-lines collection for the specified filename with the specified encoding, buffer size and terminator set.
 *
 * @param filename a filename.
 * @param encoding an encoding.
 * @param bufferSize the buffer size for {@link FastBufferedInputStream}.
 * @param terminators a set of line terminators.
 */
public FileLinesList(final CharSequence filename, final String encoding, final int bufferSize, final EnumSet<FastBufferedInputStream.LineTerminator> terminators) throws IOException {
	this.bufferSize = bufferSize;
	this.terminators = terminators;
	this.filename = filename.toString();

	inputStream = new FastBufferedInputStream(new FileInputStream(this.filename), bufferSize);
	decoder = (charset = Charset.forName(encoding)).newDecoder();
	byte[] array = new byte[16];
	int count = 0, start, len;

	for(;;) {
		start = 0;
		while((len = inputStream.readLine(array, start, array.length - start, terminators)) == array.length - start) {
			start += len;
			array = ByteArrays.grow(array, array.length + 1);
		};

		if (len != -1) count++;
		else break;
	}

	size = count;
	byteBuffer = ByteBuffer.wrap(array);
	charBuffer = CharBuffer.wrap(new char[array.length]);

	inputStream.position(0);
	borders = new EliasFanoMonotoneLongBigList(count, inputStream.length(), new LongIterator() {
		long pos = 0;
		byte[] buffer = byteBuffer.array();

		@Override
		public boolean hasNext() {
			return pos < size;
		}

		@Override
		public long nextLong() {
			if (! hasNext()) throw new NoSuchElementException();
			pos++;
			try {
				final long result = inputStream.position();
				inputStream.readLine(buffer, terminators);
				return result;
			}
			catch (final IOException e) {
				throw new RuntimeException(e);
			}
		}
	});
}
 

import it.unimi.dsi.fastutil.io.FastBufferedInputStream; //导入方法依赖的package包/类
/** Creates a file-lines collection for the specified filename with the specified encoding, buffer size and terminator set.
 *
 * @param filename a filename.
 * @param encoding an encoding.
 * @param bufferSize the buffer size for {@link FastBufferedInputStream}.
 * @param terminators a set of line terminators.
 */
public FileLinesBigList(final CharSequence filename, final String encoding, final int bufferSize, final EnumSet<FastBufferedInputStream.LineTerminator> terminators) throws IOException {
	this.bufferSize = bufferSize;
	this.terminators = terminators;
	this.filename = filename.toString();

	inputStream = new FastBufferedInputStream(new FileInputStream(this.filename), bufferSize);
	decoder = (charset = Charset.forName(encoding)).newDecoder();
	byte[] array = new byte[16];
	long count = 0;
	int start, len;

	for(;;) {
		start = 0;
		while((len = inputStream.readLine(array, start, array.length - start, terminators)) == array.length - start) {
			start += len;
			array = ByteArrays.grow(array, array.length + 1);
		};

		if (len != -1) count++;
		else break;
	}

	size = count;
	byteBuffer = ByteBuffer.wrap(array);
	charBuffer = CharBuffer.wrap(new char[array.length]);

	inputStream.position(0);
	borders = new EliasFanoMonotoneLongBigList(count, inputStream.length(), new LongIterator() {
		long pos = 0;
		byte[] buffer = byteBuffer.array();

		@Override
		public boolean hasNext() {
			return pos < size;
		}

		@Override
		public long nextLong() {
			if (! hasNext()) throw new NoSuchElementException();
			pos++;
			try {
				final long result = inputStream.position();
				inputStream.readLine(buffer, terminators);
				return result;
			}
			catch (final IOException e) {
				throw new RuntimeException(e);
			}
		}
	});
}