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7 | GenericWritable (Hadoop 0.20.1 API) |
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79 | SUMMARY: NESTED | FIELD | <A HREF="#constructor_summary">CONSTR</A> | <A HREF="#method_summary">METHOD</A></FONT></TD> |
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89 | <H2> |
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90 | <FONT SIZE="-1"> |
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91 | org.apache.hadoop.io</FONT> |
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92 | <BR> |
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93 | Class GenericWritable</H2> |
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94 | <PRE> |
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95 | <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</A> |
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96 | <IMG SRC="../../../../resources/inherit.gif" ALT="extended by "><B>org.apache.hadoop.io.GenericWritable</B> |
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97 | </PRE> |
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98 | <DL> |
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99 | <DT><B>All Implemented Interfaces:</B> <DD><A HREF="../../../../org/apache/hadoop/conf/Configurable.html" title="interface in org.apache.hadoop.conf">Configurable</A>, <A HREF="../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A></DD> |
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100 | </DL> |
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101 | <HR> |
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102 | <DL> |
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103 | <DT><PRE>public abstract class <B>GenericWritable</B><DT>extends <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A><DT>implements <A HREF="../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A>, <A HREF="../../../../org/apache/hadoop/conf/Configurable.html" title="interface in org.apache.hadoop.conf">Configurable</A></DL> |
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104 | </PRE> |
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105 | |
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106 | <P> |
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107 | A wrapper for Writable instances. |
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108 | <p> |
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109 | When two sequence files, which have same Key type but different Value |
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110 | types, are mapped out to reduce, multiple Value types is not allowed. |
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111 | In this case, this class can help you wrap instances with different types. |
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112 | </p> |
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113 | |
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114 | <p> |
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115 | Compared with <code>ObjectWritable</code>, this class is much more effective, |
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116 | because <code>ObjectWritable</code> will append the class declaration as a String |
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117 | into the output file in every Key-Value pair. |
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118 | </p> |
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119 | |
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120 | <p> |
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121 | Generic Writable implements <A HREF="../../../../org/apache/hadoop/conf/Configurable.html" title="interface in org.apache.hadoop.conf"><CODE>Configurable</CODE></A> interface, so that it will be |
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122 | configured by the framework. The configuration is passed to the wrapped objects |
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123 | implementing <A HREF="../../../../org/apache/hadoop/conf/Configurable.html" title="interface in org.apache.hadoop.conf"><CODE>Configurable</CODE></A> interface <i>before deserialization</i>. |
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124 | </p> |
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125 | |
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126 | how to use it: <br> |
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127 | 1. Write your own class, such as GenericObject, which extends GenericWritable.<br> |
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128 | 2. Implements the abstract method <code>getTypes()</code>, defines |
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129 | the classes which will be wrapped in GenericObject in application. |
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130 | Attention: this classes defined in <code>getTypes()</code> method, must |
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131 | implement <code>Writable</code> interface. |
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132 | <br><br> |
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133 | |
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134 | The code looks like this: |
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135 | <blockquote><pre> |
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136 | public class GenericObject extends GenericWritable { |
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137 | |
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138 | private static Class[] CLASSES = { |
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139 | ClassType1.class, |
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140 | ClassType2.class, |
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141 | ClassType3.class, |
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142 | }; |
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143 | |
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144 | protected Class[] getTypes() { |
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145 | return CLASSES; |
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146 | } |
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147 | |
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148 | } |
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149 | </pre></blockquote> |
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150 | <P> |
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151 | |
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152 | <P> |
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153 | <DL> |
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154 | <DT><B>Since:</B></DT> |
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155 | <DD>Nov 8, 2006</DD> |
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156 | </DL> |
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157 | <HR> |
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158 | |
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159 | <P> |
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160 | |
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161 | <!-- ======== CONSTRUCTOR SUMMARY ======== --> |
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162 | |
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163 | <A NAME="constructor_summary"><!-- --></A> |
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164 | <TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""> |
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165 | <TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"> |
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166 | <TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"> |
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167 | <B>Constructor Summary</B></FONT></TH> |
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168 | </TR> |
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169 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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170 | <TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/GenericWritable.html#GenericWritable()">GenericWritable</A></B>()</CODE> |
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171 | |
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172 | <BR> |
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173 | </TD> |
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174 | </TR> |
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175 | </TABLE> |
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176 | |
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177 | <!-- ========== METHOD SUMMARY =========== --> |
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178 | |
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179 | <A NAME="method_summary"><!-- --></A> |
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180 | <TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""> |
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181 | <TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"> |
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182 | <TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"> |
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183 | <B>Method Summary</B></FONT></TH> |
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184 | </TR> |
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185 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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186 | <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
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187 | <CODE> <A HREF="../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A></CODE></FONT></TD> |
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188 | <TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/GenericWritable.html#get()">get</A></B>()</CODE> |
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189 | |
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190 | <BR> |
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191 | Return the wrapped instance.</TD> |
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192 | </TR> |
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193 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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194 | <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
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195 | <CODE> <A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A></CODE></FONT></TD> |
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196 | <TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/GenericWritable.html#getConf()">getConf</A></B>()</CODE> |
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197 | |
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198 | <BR> |
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199 | Return the configuration used by this object.</TD> |
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200 | </TR> |
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201 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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202 | <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
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203 | <CODE>protected abstract <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</A><? extends <A HREF="../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A>>[]</CODE></FONT></TD> |
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204 | <TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/GenericWritable.html#getTypes()">getTypes</A></B>()</CODE> |
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205 | |
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206 | <BR> |
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207 | Return all classes that may be wrapped.</TD> |
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208 | </TR> |
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209 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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210 | <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
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211 | <CODE> void</CODE></FONT></TD> |
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212 | <TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/GenericWritable.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> in)</CODE> |
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213 | |
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214 | <BR> |
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215 | Deserialize the fields of this object from <code>in</code>.</TD> |
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216 | </TR> |
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217 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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218 | <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
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219 | <CODE> void</CODE></FONT></TD> |
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220 | <TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/GenericWritable.html#set(org.apache.hadoop.io.Writable)">set</A></B>(<A HREF="../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A> obj)</CODE> |
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221 | |
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222 | <BR> |
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223 | Set the instance that is wrapped.</TD> |
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224 | </TR> |
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225 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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226 | <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
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227 | <CODE> void</CODE></FONT></TD> |
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228 | <TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/GenericWritable.html#setConf(org.apache.hadoop.conf.Configuration)">setConf</A></B>(<A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A> conf)</CODE> |
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229 | |
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230 | <BR> |
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231 | Set the configuration to be used by this object.</TD> |
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232 | </TR> |
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233 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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234 | <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
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235 | <CODE> <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A></CODE></FONT></TD> |
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236 | <TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/GenericWritable.html#toString()">toString</A></B>()</CODE> |
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237 | |
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238 | <BR> |
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239 | </TD> |
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240 | </TR> |
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241 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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242 | <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
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243 | <CODE> void</CODE></FONT></TD> |
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244 | <TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/GenericWritable.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> out)</CODE> |
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245 | |
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246 | <BR> |
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247 | Serialize the fields of this object to <code>out</code>.</TD> |
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248 | </TR> |
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249 | </TABLE> |
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250 | <A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A> |
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251 | <TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""> |
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252 | <TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"> |
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253 | <TH ALIGN="left"><B>Methods inherited from class java.lang.<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A></B></TH> |
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254 | </TR> |
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255 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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256 | <TD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#clone()" title="class or interface in java.lang">clone</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#equals(java.lang.Object)" title="class or interface in java.lang">equals</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#finalize()" title="class or interface in java.lang">finalize</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#getClass()" title="class or interface in java.lang">getClass</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#hashCode()" title="class or interface in java.lang">hashCode</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#notify()" title="class or interface in java.lang">notify</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#notifyAll()" title="class or interface in java.lang">notifyAll</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait()" title="class or interface in java.lang">wait</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait(long)" title="class or interface in java.lang">wait</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait(long, int)" title="class or interface in java.lang">wait</A></CODE></TD> |
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257 | </TR> |
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258 | </TABLE> |
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259 | |
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260 | <P> |
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261 | |
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262 | <!-- ========= CONSTRUCTOR DETAIL ======== --> |
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263 | |
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264 | <A NAME="constructor_detail"><!-- --></A> |
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265 | <TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""> |
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266 | <TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"> |
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267 | <TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2"> |
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268 | <B>Constructor Detail</B></FONT></TH> |
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269 | </TR> |
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270 | </TABLE> |
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271 | |
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272 | <A NAME="GenericWritable()"><!-- --></A><H3> |
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273 | GenericWritable</H3> |
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274 | <PRE> |
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275 | public <B>GenericWritable</B>()</PRE> |
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276 | <DL> |
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277 | </DL> |
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278 | |
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279 | <!-- ============ METHOD DETAIL ========== --> |
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280 | |
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281 | <A NAME="method_detail"><!-- --></A> |
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282 | <TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""> |
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283 | <TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"> |
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284 | <TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2"> |
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285 | <B>Method Detail</B></FONT></TH> |
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286 | </TR> |
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287 | </TABLE> |
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288 | |
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289 | <A NAME="set(org.apache.hadoop.io.Writable)"><!-- --></A><H3> |
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290 | set</H3> |
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291 | <PRE> |
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292 | public void <B>set</B>(<A HREF="../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A> obj)</PRE> |
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293 | <DL> |
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294 | <DD>Set the instance that is wrapped. |
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295 | <P> |
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296 | <DD><DL> |
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297 | </DL> |
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298 | </DD> |
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299 | <DD><DL> |
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300 | <DT><B>Parameters:</B><DD><CODE>obj</CODE> - </DL> |
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301 | </DD> |
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302 | </DL> |
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303 | <HR> |
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304 | |
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305 | <A NAME="get()"><!-- --></A><H3> |
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306 | get</H3> |
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307 | <PRE> |
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308 | public <A HREF="../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A> <B>get</B>()</PRE> |
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309 | <DL> |
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310 | <DD>Return the wrapped instance. |
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311 | <P> |
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312 | <DD><DL> |
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313 | </DL> |
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314 | </DD> |
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315 | <DD><DL> |
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316 | </DL> |
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317 | </DD> |
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318 | </DL> |
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319 | <HR> |
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320 | |
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321 | <A NAME="toString()"><!-- --></A><H3> |
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322 | toString</H3> |
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323 | <PRE> |
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324 | public <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A> <B>toString</B>()</PRE> |
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325 | <DL> |
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326 | <DD><DL> |
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327 | <DT><B>Overrides:</B><DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#toString()" title="class or interface in java.lang">toString</A></CODE> in class <CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A></CODE></DL> |
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328 | </DD> |
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329 | <DD><DL> |
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330 | </DL> |
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331 | </DD> |
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332 | </DL> |
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333 | <HR> |
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334 | |
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335 | <A NAME="readFields(java.io.DataInput)"><!-- --></A><H3> |
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336 | readFields</H3> |
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337 | <PRE> |
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338 | public void <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> in) |
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339 | 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> |
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340 | <DL> |
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341 | <DD><B>Description copied from interface: <CODE><A HREF="../../../../org/apache/hadoop/io/Writable.html#readFields(java.io.DataInput)">Writable</A></CODE></B></DD> |
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342 | <DD>Deserialize the fields of this object from <code>in</code>. |
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343 | |
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344 | <p>For efficiency, implementations should attempt to re-use storage in the |
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345 | existing object where possible.</p> |
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346 | <P> |
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347 | <DD><DL> |
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348 | <DT><B>Specified by:</B><DD><CODE><A HREF="../../../../org/apache/hadoop/io/Writable.html#readFields(java.io.DataInput)">readFields</A></CODE> in interface <CODE><A HREF="../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A></CODE></DL> |
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349 | </DD> |
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350 | <DD><DL> |
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351 | <DT><B>Parameters:</B><DD><CODE>in</CODE> - <code>DataInput</code> to deseriablize this object from. |
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352 | <DT><B>Throws:</B> |
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353 | <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> |
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354 | </DD> |
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355 | </DL> |
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356 | <HR> |
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357 | |
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358 | <A NAME="write(java.io.DataOutput)"><!-- --></A><H3> |
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359 | write</H3> |
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360 | <PRE> |
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361 | public void <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> out) |
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362 | 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> |
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363 | <DL> |
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364 | <DD><B>Description copied from interface: <CODE><A HREF="../../../../org/apache/hadoop/io/Writable.html#write(java.io.DataOutput)">Writable</A></CODE></B></DD> |
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365 | <DD>Serialize the fields of this object to <code>out</code>. |
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366 | <P> |
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367 | <DD><DL> |
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368 | <DT><B>Specified by:</B><DD><CODE><A HREF="../../../../org/apache/hadoop/io/Writable.html#write(java.io.DataOutput)">write</A></CODE> in interface <CODE><A HREF="../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A></CODE></DL> |
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369 | </DD> |
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370 | <DD><DL> |
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371 | <DT><B>Parameters:</B><DD><CODE>out</CODE> - <code>DataOuput</code> to serialize this object into. |
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372 | <DT><B>Throws:</B> |
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373 | <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> |
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374 | </DD> |
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375 | </DL> |
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376 | <HR> |
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377 | |
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378 | <A NAME="getTypes()"><!-- --></A><H3> |
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379 | getTypes</H3> |
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380 | <PRE> |
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381 | protected abstract <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</A><? extends <A HREF="../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A>>[] <B>getTypes</B>()</PRE> |
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382 | <DL> |
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383 | <DD>Return all classes that may be wrapped. Subclasses should implement this |
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384 | to return a constant array of classes. |
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385 | <P> |
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386 | <DD><DL> |
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390 | </DL> |
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392 | </DL> |
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393 | <HR> |
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394 | |
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395 | <A NAME="getConf()"><!-- --></A><H3> |
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396 | getConf</H3> |
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397 | <PRE> |
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398 | public <A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A> <B>getConf</B>()</PRE> |
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399 | <DL> |
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400 | <DD><B>Description copied from interface: <CODE><A HREF="../../../../org/apache/hadoop/conf/Configurable.html#getConf()">Configurable</A></CODE></B></DD> |
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401 | <DD>Return the configuration used by this object. |
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402 | <P> |
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403 | <DD><DL> |
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404 | <DT><B>Specified by:</B><DD><CODE><A HREF="../../../../org/apache/hadoop/conf/Configurable.html#getConf()">getConf</A></CODE> in interface <CODE><A HREF="../../../../org/apache/hadoop/conf/Configurable.html" title="interface in org.apache.hadoop.conf">Configurable</A></CODE></DL> |
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405 | </DD> |
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406 | <DD><DL> |
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407 | </DL> |
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408 | </DD> |
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409 | </DL> |
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410 | <HR> |
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411 | |
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412 | <A NAME="setConf(org.apache.hadoop.conf.Configuration)"><!-- --></A><H3> |
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413 | setConf</H3> |
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414 | <PRE> |
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415 | public void <B>setConf</B>(<A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A> conf)</PRE> |
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416 | <DL> |
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417 | <DD><B>Description copied from interface: <CODE><A HREF="../../../../org/apache/hadoop/conf/Configurable.html#setConf(org.apache.hadoop.conf.Configuration)">Configurable</A></CODE></B></DD> |
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418 | <DD>Set the configuration to be used by this object. |
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419 | <P> |
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420 | <DD><DL> |
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421 | <DT><B>Specified by:</B><DD><CODE><A HREF="../../../../org/apache/hadoop/conf/Configurable.html#setConf(org.apache.hadoop.conf.Configuration)">setConf</A></CODE> in interface <CODE><A HREF="../../../../org/apache/hadoop/conf/Configurable.html" title="interface in org.apache.hadoop.conf">Configurable</A></CODE></DL> |
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422 | </DD> |
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