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CumulativeProtocolDecoder (Apache MINA API Documentation)
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org.apache.mina.filter.codec</FONT>
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Class CumulativeProtocolDecoder</H2>
<PRE>
<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html" title="class or interface in java.lang">java.lang.Object</A>
<IMG SRC="../../../../../resources/inherit.gif" ALT="extended by "><A HREF="../../../../../org/apache/mina/filter/codec/ProtocolDecoderAdapter.html" title="class in org.apache.mina.filter.codec">org.apache.mina.filter.codec.ProtocolDecoderAdapter</A>
<IMG SRC="../../../../../resources/inherit.gif" ALT="extended by "><B>org.apache.mina.filter.codec.CumulativeProtocolDecoder</B>
</PRE>
<DL>
<DT><B>All Implemented Interfaces:</B> <DD><A HREF="../../../../../org/apache/mina/filter/codec/ProtocolDecoder.html" title="interface in org.apache.mina.filter.codec">ProtocolDecoder</A></DD>
</DL>
<DL>
<DT><B>Direct Known Subclasses:</B> <DD><A HREF="../../../../../org/apache/mina/filter/codec/serialization/ObjectSerializationDecoder.html" title="class in org.apache.mina.filter.codec.serialization">ObjectSerializationDecoder</A></DD>
</DL>
<HR>
<DL>
<DT><PRE>public abstract class <B>CumulativeProtocolDecoder</B><DT>extends <A HREF="../../../../../org/apache/mina/filter/codec/ProtocolDecoderAdapter.html" title="class in org.apache.mina.filter.codec">ProtocolDecoderAdapter</A></DL>
</PRE>
<P>
A <A HREF="../../../../../org/apache/mina/filter/codec/ProtocolDecoder.html" title="interface in org.apache.mina.filter.codec"><CODE>ProtocolDecoder</CODE></A> that cumulates the content of received
buffers to a <em>cumulative buffer</em> to help users implement decoders.
<p>
If the received <A HREF="../../../../../org/apache/mina/common/ByteBuffer.html" title="class in org.apache.mina.common"><CODE>ByteBuffer</CODE></A> is only a part of a message.
decoders should cumulate received buffers to make a message complete or
to postpone decoding until more buffers arrive.
<p>
Here is an example decoder that decodes CRLF terminated lines into
<code>Command</code> objects:
<pre>
public class CRLFTerminatedCommandLineDecoder
extends CumulativeProtocolDecoder {
private Command parseCommand(ByteBuffer in) {
// Convert the bytes in the specified buffer to a
// Command object.
...
}
protected boolean doDecode(IoSession session, ByteBuffer in,
ProtocolDecoderOutput out)
throws Exception {
// Remember the initial position.
int start = in.position();
// Now find the first CRLF in the buffer.
byte previous = 0;
while (in.hasRemaining()) {
byte current = in.get();
if (previous == '\r' && current == '\n') {
// Remember the current position and limit.
int position = in.position();
int limit = in.limit();
try {
in.position(start);
in.limit(position);
// The bytes between in.position() and in.limit()
// now contain a full CRLF terminated line.
out.write(parseCommand(in.slice()));
} finally {
// Set the position to point right after the
// detected line and set the limit to the old
// one.
in.position(position);
in.limit(limit);
}
// Decoded one line; CumulativeProtocolDecoder will
// call me again until I return false. So just
// return true until there are no more lines in the
// buffer.
return true;
}
previous = current;
}
// Could not find CRLF in the buffer. Reset the initial
// position to the one we recorded above.
in.position(start);
return false;
}
}
</pre>
<P>
<P>
<DL>
<DT><B>Version:</B></DT>
<DD>$Rev: 451854 $, $Date: 2006-10-02 11:30:11 +0900 (ì›”, 02 10ì›” 2006) $</DD>
<DT><B>Author:</B></DT>
<DD>The Apache Directory Project (mina-dev@directory.apache.org)</DD>
</DL>
<HR>
<P>
<!-- ======== CONSTRUCTOR SUMMARY ======== -->
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<CODE>protected </CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/mina/filter/codec/CumulativeProtocolDecoder.html#CumulativeProtocolDecoder()">CumulativeProtocolDecoder</A></B>()</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Creates a new instance.</TD>
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<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/mina/filter/codec/CumulativeProtocolDecoder.html#decode(org.apache.mina.common.IoSession, org.apache.mina.common.ByteBuffer, org.apache.mina.filter.codec.ProtocolDecoderOutput)">decode</A></B>(<A HREF="../../../../../org/apache/mina/common/IoSession.html" title="interface in org.apache.mina.common">IoSession</A>&nbsp;session,
<A HREF="../../../../../org/apache/mina/common/ByteBuffer.html" title="class in org.apache.mina.common">ByteBuffer</A>&nbsp;in,
<A HREF="../../../../../org/apache/mina/filter/codec/ProtocolDecoderOutput.html" title="interface in org.apache.mina.filter.codec">ProtocolDecoderOutput</A>&nbsp;out)</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Cumulates content of <tt>in</tt> into internal buffer and forwards
decoding request to <A HREF="../../../../../org/apache/mina/filter/codec/CumulativeProtocolDecoder.html#doDecode(org.apache.mina.common.IoSession, org.apache.mina.common.ByteBuffer, org.apache.mina.filter.codec.ProtocolDecoderOutput)"><CODE>doDecode(IoSession, ByteBuffer, ProtocolDecoderOutput)</CODE></A>.</TD>
</TR>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/mina/filter/codec/CumulativeProtocolDecoder.html#dispose(org.apache.mina.common.IoSession)">dispose</A></B>(<A HREF="../../../../../org/apache/mina/common/IoSession.html" title="interface in org.apache.mina.common">IoSession</A>&nbsp;session)</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Releases the cumulative buffer used by the specified <tt>session</tt>.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>protected abstract &nbsp;boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/mina/filter/codec/CumulativeProtocolDecoder.html#doDecode(org.apache.mina.common.IoSession, org.apache.mina.common.ByteBuffer, org.apache.mina.filter.codec.ProtocolDecoderOutput)">doDecode</A></B>(<A HREF="../../../../../org/apache/mina/common/IoSession.html" title="interface in org.apache.mina.common">IoSession</A>&nbsp;session,
<A HREF="../../../../../org/apache/mina/common/ByteBuffer.html" title="class in org.apache.mina.common">ByteBuffer</A>&nbsp;in,
<A HREF="../../../../../org/apache/mina/filter/codec/ProtocolDecoderOutput.html" title="interface in org.apache.mina.filter.codec">ProtocolDecoderOutput</A>&nbsp;out)</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Implement this method to consume the specified cumulative buffer and
decode its content into message(s).</TD>
</TR>
</TABLE>
&nbsp;<A NAME="methods_inherited_from_class_org.apache.mina.filter.codec.ProtocolDecoderAdapter"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
<TH ALIGN="left"><B>Methods inherited from class org.apache.mina.filter.codec.<A HREF="../../../../../org/apache/mina/filter/codec/ProtocolDecoderAdapter.html" title="class in org.apache.mina.filter.codec">ProtocolDecoderAdapter</A></B></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="../../../../../org/apache/mina/filter/codec/ProtocolDecoderAdapter.html#finishDecode(org.apache.mina.common.IoSession, org.apache.mina.filter.codec.ProtocolDecoderOutput)">finishDecode</A></CODE></TD>
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<TH ALIGN="left"><B>Methods inherited from class java.lang.<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A></B></TH>
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<!-- ========= CONSTRUCTOR DETAIL ======== -->
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<A NAME="CumulativeProtocolDecoder()"><!-- --></A><H3>
CumulativeProtocolDecoder</H3>
<PRE>
protected <B>CumulativeProtocolDecoder</B>()</PRE>
<DL>
<DD>Creates a new instance.
<P>
</DL>
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<A NAME="decode(org.apache.mina.common.IoSession, org.apache.mina.common.ByteBuffer, org.apache.mina.filter.codec.ProtocolDecoderOutput)"><!-- --></A><H3>
decode</H3>
<PRE>
public void <B>decode</B>(<A HREF="../../../../../org/apache/mina/common/IoSession.html" title="interface in org.apache.mina.common">IoSession</A>&nbsp;session,
<A HREF="../../../../../org/apache/mina/common/ByteBuffer.html" title="class in org.apache.mina.common">ByteBuffer</A>&nbsp;in,
<A HREF="../../../../../org/apache/mina/filter/codec/ProtocolDecoderOutput.html" title="interface in org.apache.mina.filter.codec">ProtocolDecoderOutput</A>&nbsp;out)
throws <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Exception.html" title="class or interface in java.lang">Exception</A></PRE>
<DL>
<DD>Cumulates content of <tt>in</tt> into internal buffer and forwards
decoding request to <A HREF="../../../../../org/apache/mina/filter/codec/CumulativeProtocolDecoder.html#doDecode(org.apache.mina.common.IoSession, org.apache.mina.common.ByteBuffer, org.apache.mina.filter.codec.ProtocolDecoderOutput)"><CODE>doDecode(IoSession, ByteBuffer, ProtocolDecoderOutput)</CODE></A>.
<tt>doDecode()</tt> is invoked repeatedly until it returns <tt>false</tt>
and the cumulative buffer is compacted after decoding ends.
<P>
<DD><DL>
<DT><B>Throws:</B>
<DD><CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/IllegalStateException.html" title="class or interface in java.lang">IllegalStateException</A></CODE> - if your <tt>doDecode()</tt> returned
<tt>true</tt> not consuming the cumulative buffer.
<DD><CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Exception.html" title="class or interface in java.lang">Exception</A></CODE> - if the read data violated protocol specification</DL>
</DD>
</DL>
<HR>
<A NAME="doDecode(org.apache.mina.common.IoSession, org.apache.mina.common.ByteBuffer, org.apache.mina.filter.codec.ProtocolDecoderOutput)"><!-- --></A><H3>
doDecode</H3>
<PRE>
protected abstract boolean <B>doDecode</B>(<A HREF="../../../../../org/apache/mina/common/IoSession.html" title="interface in org.apache.mina.common">IoSession</A>&nbsp;session,
<A HREF="../../../../../org/apache/mina/common/ByteBuffer.html" title="class in org.apache.mina.common">ByteBuffer</A>&nbsp;in,
<A HREF="../../../../../org/apache/mina/filter/codec/ProtocolDecoderOutput.html" title="interface in org.apache.mina.filter.codec">ProtocolDecoderOutput</A>&nbsp;out)
throws <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Exception.html" title="class or interface in java.lang">Exception</A></PRE>
<DL>
<DD>Implement this method to consume the specified cumulative buffer and
decode its content into message(s).
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>in</CODE> - the cumulative buffer
<DT><B>Returns:</B><DD><tt>true</tt> if and only if there's more to decode in the buffer
and you want to have <tt>doDecode</tt> method invoked again.
Return <tt>false</tt> if remaining data is not enough to decode,
then this method will be invoked again when more data is cumulated.
<DT><B>Throws:</B>
<DD><CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Exception.html" title="class or interface in java.lang">Exception</A></CODE> - if cannot decode <tt>in</tt>.</DL>
</DD>
</DL>
<HR>
<A NAME="dispose(org.apache.mina.common.IoSession)"><!-- --></A><H3>
dispose</H3>
<PRE>
public void <B>dispose</B>(<A HREF="../../../../../org/apache/mina/common/IoSession.html" title="interface in org.apache.mina.common">IoSession</A>&nbsp;session)
throws <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Exception.html" title="class or interface in java.lang">Exception</A></PRE>
<DL>
<DD>Releases the cumulative buffer used by the specified <tt>session</tt>.
Please don't forget to call <tt>super.dispose( session )</tt> when
you override this method.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../org/apache/mina/filter/codec/ProtocolDecoder.html#dispose(org.apache.mina.common.IoSession)">dispose</A></CODE> in interface <CODE><A HREF="../../../../../org/apache/mina/filter/codec/ProtocolDecoder.html" title="interface in org.apache.mina.filter.codec">ProtocolDecoder</A></CODE><DT><B>Overrides:</B><DD><CODE><A HREF="../../../../../org/apache/mina/filter/codec/ProtocolDecoderAdapter.html#dispose(org.apache.mina.common.IoSession)">dispose</A></CODE> in class <CODE><A HREF="../../../../../org/apache/mina/filter/codec/ProtocolDecoderAdapter.html" title="class in org.apache.mina.filter.codec">ProtocolDecoderAdapter</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Throws:</B>
<DD><CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Exception.html" title="class or interface in java.lang">Exception</A></CODE> - if failed to dispose all resources</DL>
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