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91org.apache.hadoop.io</FONT>
92<BR>
93Interface Writable</H2>
94<DL>
95<DT><B>All Known Subinterfaces:</B> <DD><A HREF="../../../../org/apache/hadoop/mapred/InputSplit.html" title="interface in org.apache.hadoop.mapred">InputSplit</A>, <A HREF="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A>&lt;T&gt;</DD>
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98<DT><B>All Known Implementing Classes:</B> <DD><A HREF="../../../../org/apache/hadoop/io/AbstractMapWritable.html" title="class in org.apache.hadoop.io">AbstractMapWritable</A>, <A HREF="../../../../org/apache/hadoop/io/ArrayWritable.html" title="class in org.apache.hadoop.io">ArrayWritable</A>, <A HREF="../../../../org/apache/hadoop/fs/BlockLocation.html" title="class in org.apache.hadoop.fs">BlockLocation</A>, <A HREF="../../../../org/apache/hadoop/util/bloom/BloomFilter.html" title="class in org.apache.hadoop.util.bloom">BloomFilter</A>, <A HREF="../../../../org/apache/hadoop/io/BooleanWritable.html" title="class in org.apache.hadoop.io">BooleanWritable</A>, <A HREF="../../../../org/apache/hadoop/io/BytesWritable.html" title="class in org.apache.hadoop.io">BytesWritable</A>, <A HREF="../../../../org/apache/hadoop/io/ByteWritable.html" title="class in org.apache.hadoop.io">ByteWritable</A>, <A HREF="../../../../org/apache/hadoop/mapred/ClusterStatus.html" title="class in 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org.apache.hadoop.security">UnixUserGroupInformation</A>, <A HREF="../../../../org/apache/hadoop/security/UserGroupInformation.html" title="class in org.apache.hadoop.security">UserGroupInformation</A>, <A HREF="../../../../org/apache/hadoop/io/UTF8.html" title="class in org.apache.hadoop.io">UTF8</A>, <A HREF="../../../../org/apache/hadoop/io/VersionedWritable.html" title="class in org.apache.hadoop.io">VersionedWritable</A>, <A HREF="../../../../org/apache/hadoop/io/VIntWritable.html" title="class in org.apache.hadoop.io">VIntWritable</A>, <A HREF="../../../../org/apache/hadoop/io/VLongWritable.html" title="class in org.apache.hadoop.io">VLongWritable</A></DD>
99</DL>
100<HR>
101<DL>
102<DT><PRE>public interface <B>Writable</B></DL>
103</PRE>
104
105<P>
106A serializable object which implements a simple, efficient, serialization
107 protocol, based on <A HREF="http://java.sun.com/javase/6/docs/api/java/io/DataInput.html?is-external=true" title="class or interface in java.io"><CODE>DataInput</CODE></A> and <A HREF="http://java.sun.com/javase/6/docs/api/java/io/DataOutput.html?is-external=true" title="class or interface in java.io"><CODE>DataOutput</CODE></A>.
108
109 <p>Any <code>key</code> or <code>value</code> type in the Hadoop Map-Reduce
110 framework implements this interface.</p>
111 
112 <p>Implementations typically implement a static <code>read(DataInput)</code>
113 method which constructs a new instance, calls <A HREF="../../../../org/apache/hadoop/io/Writable.html#readFields(java.io.DataInput)"><CODE>readFields(DataInput)</CODE></A> 
114 and returns the instance.</p>
115 
116 <p>Example:</p>
117 <p><blockquote><pre>
118     public class MyWritable implements Writable {
119       // Some data     
120       private int counter;
121       private long timestamp;
122       
123       public void write(DataOutput out) throws IOException {
124         out.writeInt(counter);
125         out.writeLong(timestamp);
126       }
127       
128       public void readFields(DataInput in) throws IOException {
129         counter = in.readInt();
130         timestamp = in.readLong();
131       }
132       
133       public static MyWritable read(DataInput in) throws IOException {
134         MyWritable w = new MyWritable();
135         w.readFields(in);
136         return w;
137       }
138     }
139 </pre></blockquote></p>
140<P>
141
142<P>
143<HR>
144
145<P>
146
147<!-- ========== METHOD SUMMARY =========== -->
148
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152<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
153<B>Method Summary</B></FONT></TH>
154</TR>
155<TR BGCOLOR="white" CLASS="TableRowColor">
156<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
157<CODE>&nbsp;void</CODE></FONT></TD>
158<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/Writable.html#readFields(java.io.DataInput)">readFields</A></B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/io/DataInput.html?is-external=true" title="class or interface in java.io">DataInput</A>&nbsp;in)</CODE>
159
160<BR>
161&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Deserialize the fields of this object from <code>in</code>.</TD>
162</TR>
163<TR BGCOLOR="white" CLASS="TableRowColor">
164<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
165<CODE>&nbsp;void</CODE></FONT></TD>
166<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/Writable.html#write(java.io.DataOutput)">write</A></B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/io/DataOutput.html?is-external=true" title="class or interface in java.io">DataOutput</A>&nbsp;out)</CODE>
167
168<BR>
169&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Serialize the fields of this object to <code>out</code>.</TD>
170</TR>
171</TABLE>
172&nbsp;
173<P>
174
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176
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181<B>Method Detail</B></FONT></TH>
182</TR>
183</TABLE>
184
185<A NAME="write(java.io.DataOutput)"><!-- --></A><H3>
186write</H3>
187<PRE>
188void <B>write</B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/io/DataOutput.html?is-external=true" title="class or interface in java.io">DataOutput</A>&nbsp;out)
189           throws <A HREF="http://java.sun.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></PRE>
190<DL>
191<DD>Serialize the fields of this object to <code>out</code>.
192<P>
193<DD><DL>
194<DT><B>Parameters:</B><DD><CODE>out</CODE> - <code>DataOuput</code> to serialize this object into.
195<DT><B>Throws:</B>
196<DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></CODE></DL>
197</DD>
198</DL>
199<HR>
200
201<A NAME="readFields(java.io.DataInput)"><!-- --></A><H3>
202readFields</H3>
203<PRE>
204void <B>readFields</B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/io/DataInput.html?is-external=true" title="class or interface in java.io">DataInput</A>&nbsp;in)
205                throws <A HREF="http://java.sun.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></PRE>
206<DL>
207<DD>Deserialize the fields of this object from <code>in</code>. 
208 
209 <p>For efficiency, implementations should attempt to re-use storage in the
210 existing object where possible.</p>
211<P>
212<DD><DL>
213<DT><B>Parameters:</B><DD><CODE>in</CODE> - <code>DataInput</code> to deseriablize this object from.
214<DT><B>Throws:</B>
215<DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></CODE></DL>
216</DD>
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