File	Doc	Category	Size	Date	Package
MarkableInputStream.java	API Doc	phoneME MR2 API (J2ME)	6056	Wed May 02 18:00:28 BST 2007	com.sun.kvem.midp.pim

MarkableInputStream

• java.lang.Object
  • java.io.InputStream

Fields Summary
private final InputStream	in Input stream.
private ByteArrayOutputStream	baos Internal buffered stream.
private byte[]	buffer Current buffer.
private int	bufferIndex Current index in buffer.

Constructors Summary
public MarkableInputStream(InputStream in) Constructs a markable input stream. param in input data this.in = in;

Methods Summary
public void	close() Closes the input stream. throws IOException if any error occurs in.close(); baos.close(); baos = null; buffer = null;
public void	mark(int lookahead) This implementation of mark() supports infinite lookahead. param lookahead The value of this parameter is ignored. baos = new ByteArrayOutputStream();
public boolean	markSupported() Checks if mark is supported. return true if mark is supported return true;
public int	read(byte[] b) Reads next block of bytes from the stream. param b buffer to hold data return number of bytes read throws IOException if an error occurs return read(b, 0, b.length);
public int	read() Reads a byte from the stream. return next byte from stream throws IOException if an error occurs if (buffer != null) { return readFromBuffer(); } else { return readFromStream(); }
public int	read(byte[] b, int offset, int length) Reads next block of bytes from the stream. param b buffer to hold data param offset in buffer for data read param length size of data to read return number of bytes read throws IOException if an error occurs if (buffer != null) { return readFromBuffer(b, offset, length); } else { return readFromStream(b, offset, length); }
private int	readFromBuffer(byte[] b, int offset, int length) Reads next block of bytes from the internal buffer. param b buffer to hold data param offset in buffer for data read param length size of data to read return number of bytes read int bytesRead = -1; if (length <= buffer.length - bufferIndex) { System.arraycopy(buffer, bufferIndex, b, offset, length); bufferIndex += length; bytesRead = length; } else { int count = buffer.length - bufferIndex; System.arraycopy(buffer, bufferIndex, b, offset, count); buffer = null; bytesRead = count; } if (baos != null) { baos.write(b, offset, bytesRead); } return bytesRead;
private int	readFromBuffer() Reads a byte from the internal buffer. return next byte from the buffer. int i = buffer[bufferIndex++]; if (baos != null) { baos.write(i); } if (bufferIndex == buffer.length) { buffer = null; } return i;
private int	readFromStream(byte[] b, int offset, int length) Reads next block of bytes from the stream. param b buffer to hold data param offset in buffer for data read param length size of data to read return number of bytes read throws IOException if an error occurs int i = in.read(b, offset, length); if (i != -1 && baos != null) { baos.write(b, offset, i); } return i;
private int	readFromStream() Reads next value from the input stream. return next value from stream throws IOException if an error occurs int i = in.read(); if (i != -1 && baos != null) { baos.write(i); } return i;
public void	reset() Reset the line markers. throws IOException if an error occurs accessing the input stream if (baos == null) { throw new IOException("Cannot reset an unmarked stream"); } if (baos.size() == 0) { // no data was read since the call to mark() baos = null; } else { buffer = baos.toByteArray(); baos = null; bufferIndex = 0; }