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package java.io;
This class allows an application to create an input stream in which the bytes read are supplied by the contents of a string. Applications can also read bytes from a byte array by using a ByteArrayInputStream.
Only the low eight bits of each character in the string are used by
this class.
Author: Arthur van Hoff See Also: Since: 1.0 Deprecated: This class does not properly convert characters into bytes. As of JDK 1.1, the preferred way to create a stream from a string is via the StringReader class.
/**
* This class allows an application to create an input stream in
* which the bytes read are supplied by the contents of a string.
* Applications can also read bytes from a byte array by using a
* {@code ByteArrayInputStream}.
* <p>
* Only the low eight bits of each character in the string are used by
* this class.
*
* @author Arthur van Hoff
* @see java.io.ByteArrayInputStream
* @see java.io.StringReader
* @since 1.0
* @deprecated This class does not properly convert characters into bytes. As
* of JDK 1.1, the preferred way to create a stream from a
* string is via the {@code StringReader} class.
*/
@Deprecated
public class StringBufferInputStream extends InputStream {
The string from which bytes are read.
/**
* The string from which bytes are read.
*/
protected String buffer;
The index of the next character to read from the input stream buffer.
See Also: - buffer.buffer
/**
* The index of the next character to read from the input stream buffer.
*
* @see java.io.StringBufferInputStream#buffer
*/
protected int pos;
The number of valid characters in the input stream buffer.
See Also: - buffer.buffer
/**
* The number of valid characters in the input stream buffer.
*
* @see java.io.StringBufferInputStream#buffer
*/
protected int count;
Creates a string input stream to read data from the specified string.
Params: - s – the underlying input buffer.
/**
* Creates a string input stream to read data from the specified string.
*
* @param s the underlying input buffer.
*/
public StringBufferInputStream(String s) {
this.buffer = s;
count = s.length();
}
Reads the next byte of data from this input stream. The value byte is returned as an int in the range 0 to 255. If no byte is available because the end of the stream has been reached, the value -1 is returned. The read method of StringBufferInputStream cannot block. It returns the low eight bits of the next character in this input stream's buffer.
Returns: the next byte of data, or -1 if the end of the stream is reached.
/**
* Reads the next byte of data from this input stream. The value
* byte is returned as an {@code int} in the range
* {@code 0} to {@code 255}. If no byte is available
* because the end of the stream has been reached, the value
* {@code -1} is returned.
* <p>
* The {@code read} method of
* {@code StringBufferInputStream} cannot block. It returns the
* low eight bits of the next character in this input stream's buffer.
*
* @return the next byte of data, or {@code -1} if the end of the
* stream is reached.
*/
public synchronized int read() {
return (pos < count) ? (buffer.charAt(pos++) & 0xFF) : -1;
}
Reads up to len bytes of data from this input stream into an array of bytes. The read method of StringBufferInputStream cannot block. It copies the low eight bits from the characters in this input stream's buffer into the byte array argument.
Params: - b – the buffer into which the data is read.
- off – the start offset of the data.
- len – the maximum number of bytes read.
Returns: the total number of bytes read into the buffer, or -1 if there is no more data because the end of the stream has been reached.
/**
* Reads up to {@code len} bytes of data from this input stream
* into an array of bytes.
* <p>
* The {@code read} method of
* {@code StringBufferInputStream} cannot block. It copies the
* low eight bits from the characters in this input stream's buffer into
* the byte array argument.
*
* @param b the buffer into which the data is read.
* @param off the start offset of the data.
* @param len the maximum number of bytes read.
* @return the total number of bytes read into the buffer, or
* {@code -1} if there is no more data because the end of
* the stream has been reached.
*/
@SuppressWarnings("deprecation")
public synchronized int read(byte b[], int off, int len) {
if (b == null) {
throw new NullPointerException();
} else if ((off < 0) || (off > b.length) || (len < 0) ||
((off + len) > b.length) || ((off + len) < 0)) {
throw new IndexOutOfBoundsException();
}
if (pos >= count) {
return -1;
}
int avail = count - pos;
if (len > avail) {
len = avail;
}
if (len <= 0) {
return 0;
}
buffer.getBytes(pos, pos + len, b, off);
pos += len;
return len;
}
Skips n bytes of input from this input stream. Fewer bytes might be skipped if the end of the input stream is reached. Params: - n – the number of bytes to be skipped.
Returns: the actual number of bytes skipped.
/**
* Skips {@code n} bytes of input from this input stream. Fewer
* bytes might be skipped if the end of the input stream is reached.
*
* @param n the number of bytes to be skipped.
* @return the actual number of bytes skipped.
*/
public synchronized long skip(long n) {
if (n < 0) {
return 0;
}
if (n > count - pos) {
n = count - pos;
}
pos += n;
return n;
}
Returns the number of bytes that can be read from the input
stream without blocking.
Returns: the value of count - pos, which is the
number of bytes remaining to be read from the input buffer.
/**
* Returns the number of bytes that can be read from the input
* stream without blocking.
*
* @return the value of <code>count - pos</code>, which is the
* number of bytes remaining to be read from the input buffer.
*/
public synchronized int available() {
return count - pos;
}
Resets the input stream to begin reading from the first character
of this input stream's underlying buffer.
/**
* Resets the input stream to begin reading from the first character
* of this input stream's underlying buffer.
*/
public synchronized void reset() {
pos = 0;
}
}