pushbackinputstream.html

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<A NAME="pos"><!-- --></A><H3>
pos</H3>
<PRE>
protected int <B>pos</B></PRE>
<DL>
<DD>The position within the pushback buffer from which the next byte will
 be read.  When the buffer is empty, <code>pos</code> is equal to
 <code>buf.length</code>; when the buffer is full, <code>pos</code> is
 equal to zero.<DD><DL>
<DT><B>Since: </B><DD>JDK1.1</DD>
</DL>
</DD>
</DL>

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<A NAME="PushbackInputStream(java.io.InputStream, int)"><!-- --></A><H3>
PushbackInputStream</H3>
<PRE>
public <B>PushbackInputStream</B>(<A HREF="../../java/io/InputStream.html">InputStream</A>&nbsp;in,
                           int&nbsp;size)</PRE>
<DL>
<DD>Creates a <code>PushbackInputStream</code>
 with a pushback buffer of the specified <code>size</code>,
 and saves its  argument, the input stream
 <code>in</code>, for later use. Initially,
 there is no pushed-back byte  (the field
 <code>pushBack</code> is initialized to
 <code>-1</code>).<DD><DL>
<DT><B>Parameters:</B><DD><CODE>in</CODE> - the input stream from which bytes will be read.<DD><CODE>size</CODE> - the size of the pushback buffer.<DT><B>Throws:</B><DD><CODE><A HREF="../../java/lang/IllegalArgumentException.html">IllegalArgumentException</A></CODE> - if size is <= 0<DT><B>Since: </B><DD>JDK1.1</DD>
</DL>
</DD>
</DL>
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<A NAME="PushbackInputStream(java.io.InputStream)"><!-- --></A><H3>
PushbackInputStream</H3>
<PRE>
public <B>PushbackInputStream</B>(<A HREF="../../java/io/InputStream.html">InputStream</A>&nbsp;in)</PRE>
<DL>
<DD>Creates a <code>PushbackInputStream</code>
 and saves its  argument, the input stream
 <code>in</code>, for later use. Initially,
 there is no pushed-back byte  (the field
 <code>pushBack</code> is initialized to
 <code>-1</code>).<DD><DL>
<DT><B>Parameters:</B><DD><CODE>in</CODE> - the input stream from which bytes will be read.</DL>
</DD>
</DL>

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<A NAME="read()"><!-- --></A><H3>
read</H3>
<PRE>
public int <B>read</B>()
         throws <A HREF="../../java/io/IOException.html">IOException</A></PRE>
<DL>
<DD>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. This method blocks until input data 
 is available, the end of the stream is detected, or an exception 
 is thrown. 

 <p> This method returns the most recently pushed-back byte, if there is
 one, and otherwise calls the <code>read</code> method of its underlying
 input stream and returns whatever value that method returns.<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../java/io/FilterInputStream.html#read()">read</A></CODE> in class <CODE><A HREF="../../java/io/FilterInputStream.html">FilterInputStream</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the next byte of data, or <code>-1</code> if the end of the
             stream has been reached.<DT><B>Throws:</B><DD><CODE><A HREF="../../java/io/IOException.html">IOException</A></CODE> - if an I/O error occurs.<DT><B>See Also: </B><DD><A HREF="../../java/io/InputStream.html#read()"><CODE>InputStream.read()</CODE></A></DL>
</DD>
</DL>
<HR>

<A NAME="read(byte[], int, int)"><!-- --></A><H3>
read</H3>
<PRE>
public int <B>read</B>(byte[]&nbsp;b,
                int&nbsp;off,
                int&nbsp;len)
         throws <A HREF="../../java/io/IOException.html">IOException</A></PRE>
<DL>
<DD>Reads up to <code>len</code> bytes of data from this input stream into
 an array of bytes.  This method first reads any pushed-back bytes; after
 that, if fewer than than <code>len</code> bytes have been read then it
 reads from the underlying input stream.  This method blocks until at
 least 1 byte of input is available.<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../java/io/FilterInputStream.html#read(byte[], int, int)">read</A></CODE> in class <CODE><A HREF="../../java/io/FilterInputStream.html">FilterInputStream</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>b</CODE> - the buffer into which the data is read.<DD><CODE>off</CODE> - the start offset of the data.<DD><CODE>len</CODE> - the maximum number of bytes read.<DT><B>Returns:</B><DD>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.<DT><B>Throws:</B><DD><CODE><A HREF="../../java/io/IOException.html">IOException</A></CODE> - if an I/O error occurs.<DT><B>See Also: </B><DD><A HREF="../../java/io/InputStream.html#read(byte[], int, int)"><CODE>InputStream.read(byte[], int, int)</CODE></A></DL>
</DD>
</DL>
<HR>

<A NAME="unread(int)"><!-- --></A><H3>
unread</H3>
<PRE>
public void <B>unread</B>(int&nbsp;b)
            throws <A HREF="../../java/io/IOException.html">IOException</A></PRE>
<DL>
<DD>Pushes back a byte by copying it to the front of the pushback buffer.
 After this method returns, the next byte to be read will have the value
 <code>(byte)b</code>.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>b</CODE> - the <code>int</code> value whose low-order 
 			byte is to be pushed back.<DT><B>Throws:</B><DD><CODE><A HREF="../../java/io/IOException.html">IOException</A></CODE> - If there is not enough room in the pushback
			      buffer for the byte.</DL>
</DD>
</DL>
<HR>

<A NAME="unread(byte[], int, int)"><!-- --></A><H3>
unread</H3>
<PRE>
public void <B>unread</B>(byte[]&nbsp;b,
                   int&nbsp;off,
                   int&nbsp;len)
            throws <A HREF="../../java/io/IOException.html">IOException</A></PRE>
<DL>
<DD>Pushes back a portion of an array of bytes by copying it to the front
 of the pushback buffer.  After this method returns, the next byte to be
 read will have the value <code>b[off]</code>, the byte after that will
 have the value <code>b[off+1]</code>, and so forth.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>b</CODE> - the byte array to push back.<DD><CODE>off</CODE> - the start offset of the data.<DD><CODE>len</CODE> - the number of bytes to push back.<DT><B>Throws:</B><DD><CODE><A HREF="../../java/io/IOException.html">IOException</A></CODE> - If there is not enough room in the pushback
			      buffer for the specified number of bytes.<DT><B>Since: </B><DD>JDK1.1</DD>
</DL>
</DD>
</DL>
<HR>

<A NAME="unread(byte[])"><!-- --></A><H3>
unread</H3>
<PRE>
public void <B>unread</B>(byte[]&nbsp;b)
            throws <A HREF="../../java/io/IOException.html">IOException</A></PRE>
<DL>
<DD>Pushes back an array of bytes by copying it to the front of the
 pushback buffer.  After this method returns, the next byte to be read
 will have the value <code>b[0]</code>, the byte after that will have the
 value <code>b[1]</code>, and so forth.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>b</CODE> - the byte array to push back<DT><B>Throws:</B><DD><CODE><A HREF="../../java/io/IOException.html">IOException</A></CODE> - If there is not enough room in the pushback
			      buffer for the specified number of bytes.<DT><B>Since: </B><DD>JDK1.1</DD>
</DL>
</DD>
</DL>
<HR>

<A NAME="available()"><!-- --></A><H3>
available</H3>
<PRE>
public int <B>available</B>()
              throws <A HREF="../../java/io/IOException.html">IOException</A></PRE>
<DL>
<DD>Returns the number of bytes that can be read from this input stream
 without blocking.  This method calls the <code>available</code> method
 of the underlying input stream; it returns that value plus the number of
 bytes that have been pushed back.<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../java/io/FilterInputStream.html#available()">available</A></CODE> in class <CODE><A HREF="../../java/io/FilterInputStream.html">FilterInputStream</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the number of bytes that can be read from the input stream
             without blocking.<DT><B>Throws:</B><DD><CODE><A HREF="../../java/io/IOException.html">IOException</A></CODE> - if an I/O error occurs.<DT><B>See Also: </B><DD><A HREF="../../java/io/FilterInputStream.html#in"><CODE>FilterInputStream.in</CODE></A>, 
<A HREF="../../java/io/InputStream.html#available()"><CODE>InputStream.available()</CODE></A></DL>
</DD>
</DL>
<HR>

<A NAME="skip(long)"><!-- --></A><H3>
skip</H3>
<PRE>
public long <B>skip</B>(long&nbsp;n)
          throws <A HREF="../../java/io/IOException.html">IOException</A></PRE>
<DL>
<DD>Skips over and discards <code>n</code> bytes of data from this 
 input stream. The <code>skip</code> method may, for a variety of 
 reasons, end up skipping over some smaller number of bytes, 
 possibly zero.  If <code>n</code> is negative, no bytes are skipped.
 
 <p> The <code>skip</code> method of <code>PushbackInputStream</code>
 first skips over the bytes in the pushback buffer, if any.  It then
 calls the <code>skip</code> method of the underlying input stream if
 more bytes need to be skipped.  The actual number of bytes skipped
 is returned.<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../java/io/FilterInputStream.html#skip(long)">skip</A></CODE> in class <CODE><A HREF="../../java/io/FilterInputStream.html">FilterInputStream</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>n</CODE> - the number of bytes to be skipped.<DT><B>Returns:</B><DD>the actual number of bytes skipped.<DT><B>Throws:</B><DD><CODE><A HREF="../../java/io/IOException.html">IOException</A></CODE> - if an I/O error occurs.<DT><B>Since: </B><DD>1.2</DD>
<DT><B>See Also: </B><DD><A HREF="../../java/io/FilterInputStream.html#in"><CODE>FilterInputStream.in</CODE></A>, 
<A HREF="../../java/io/InputStream.html#skip(long)"><CODE>InputStream.skip(long n)</CODE></A></DL>
</DD>
</DL>
<HR>

<A NAME="markSupported()"><!-- --></A><H3>
markSupported</H3>
<PRE>
public boolean <B>markSupported</B>()</PRE>
<DL>
<DD>Tests if this input stream supports the <code>mark</code> and
 <code>reset</code> methods, which it does not.<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../java/io/FilterInputStream.html#markSupported()">markSupported</A></CODE> in class <CODE><A HREF="../../java/io/FilterInputStream.html">FilterInputStream</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD><code>false</code>, since this class does not support the
           <code>mark</code> and <code>reset</code> methods.<DT><B>See Also: </B><DD><A HREF="../../java/io/InputStream.html#mark(int)"><CODE>InputStream.mark(int)</CODE></A>, 
<A HREF="../../java/io/InputStream.html#reset()"><CODE>InputStream.reset()</CODE></A></DL>
</DD>
</DL>
<HR>

<A NAME="close()"><!-- --></A><H3>
close</H3>
<PRE>
public void <B>close</B>()
           throws <A HREF="../../java/io/IOException.html">IOException</A></PRE>
<DL>
<DD>Closes this input stream and releases any system resources 
 associated with the stream.<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../java/io/FilterInputStream.html#close()">close</A></CODE> in class <CODE><A HREF="../../java/io/FilterInputStream.html">FilterInputStream</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Throws:</B><DD><CODE><A HREF="../../java/io/IOException.html">IOException</A></CODE> - if an I/O error occurs.</DL>
</DD>
</DL>
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