/*
* Copyright (c) 1995, 2004, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
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</code>.
* <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</code> 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</code> in the range
* <code>0</code> to <code>255</code>. If no byte is available
* because the end of the stream has been reached, the value
* <code>-1</code> is returned.
* <p>
* The <code>read</code> method of
* <code>StringBufferInputStream</code> 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</code> 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</code> bytes of data from this input stream
* into an array of bytes.
* <p>
* The <code>read</code> method of
* <code>StringBufferInputStream</code> 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</code> 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</code> 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;
}
}