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7 | ResetableIterator (Hadoop 0.20.1 API) |
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89 | <H2> |
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90 | <FONT SIZE="-1"> |
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91 | org.apache.hadoop.mapred.join</FONT> |
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92 | <BR> |
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93 | Interface ResetableIterator<T extends <A HREF="../../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A>></H2> |
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94 | <DL> |
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95 | <DT><B>All Known Implementing Classes:</B> <DD><A HREF="../../../../../org/apache/hadoop/mapred/join/ArrayListBackedIterator.html" title="class in org.apache.hadoop.mapred.join">ArrayListBackedIterator</A>, <A HREF="../../../../../org/apache/hadoop/mapred/join/JoinRecordReader.JoinDelegationIterator.html" title="class in org.apache.hadoop.mapred.join">JoinRecordReader.JoinDelegationIterator</A>, <A HREF="../../../../../org/apache/hadoop/mapred/join/MultiFilterRecordReader.MultiFilterDelegationIterator.html" title="class in org.apache.hadoop.mapred.join">MultiFilterRecordReader.MultiFilterDelegationIterator</A>, <A HREF="../../../../../org/apache/hadoop/mapred/join/ResetableIterator.EMPTY.html" title="class in org.apache.hadoop.mapred.join">ResetableIterator.EMPTY</A>, <A HREF="../../../../../org/apache/hadoop/mapred/join/StreamBackedIterator.html" title="class in org.apache.hadoop.mapred.join">StreamBackedIterator</A></DD> |
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96 | </DL> |
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97 | <HR> |
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98 | <DL> |
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99 | <DT><PRE>public interface <B>ResetableIterator<T extends <A HREF="../../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A>></B></DL> |
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100 | </PRE> |
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101 | |
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102 | <P> |
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103 | This defines an interface to a stateful Iterator that can replay elements |
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104 | added to it directly. |
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105 | Note that this does not extend <A HREF="http://java.sun.com/javase/6/docs/api/java/util/Iterator.html?is-external=true" title="class or interface in java.util"><CODE>Iterator</CODE></A>. |
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121 | <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
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122 | <CODE>static class</CODE></FONT></TD> |
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123 | <TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/join/ResetableIterator.EMPTY.html" title="class in org.apache.hadoop.mapred.join">ResetableIterator.EMPTY</A><<A HREF="../../../../../org/apache/hadoop/mapred/join/ResetableIterator.EMPTY.html" title="type parameter in ResetableIterator.EMPTY">U</A> extends <A HREF="../../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A>></B></CODE> |
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124 | |
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125 | <BR> |
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127 | </TR> |
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128 | </TABLE> |
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137 | </TR> |
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138 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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139 | <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
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140 | <CODE> void</CODE></FONT></TD> |
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141 | <TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/join/ResetableIterator.html#add(T)">add</A></B>(<A HREF="../../../../../org/apache/hadoop/mapred/join/ResetableIterator.html" title="type parameter in ResetableIterator">T</A> item)</CODE> |
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142 | |
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143 | <BR> |
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144 | Add an element to the collection of elements to iterate over.</TD> |
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145 | </TR> |
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146 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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147 | <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
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148 | <CODE> void</CODE></FONT></TD> |
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149 | <TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/join/ResetableIterator.html#clear()">clear</A></B>()</CODE> |
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150 | |
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151 | <BR> |
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152 | Close datasources, but do not release internal resources.</TD> |
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153 | </TR> |
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154 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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155 | <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
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156 | <CODE> void</CODE></FONT></TD> |
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157 | <TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/join/ResetableIterator.html#close()">close</A></B>()</CODE> |
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158 | |
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159 | <BR> |
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160 | Close datasources and release resources.</TD> |
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161 | </TR> |
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162 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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163 | <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
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164 | <CODE> boolean</CODE></FONT></TD> |
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165 | <TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/join/ResetableIterator.html#hasNext()">hasNext</A></B>()</CODE> |
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166 | |
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167 | <BR> |
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168 | True if a call to next may return a value.</TD> |
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169 | </TR> |
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170 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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171 | <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
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172 | <CODE> boolean</CODE></FONT></TD> |
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173 | <TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/join/ResetableIterator.html#next(T)">next</A></B>(<A HREF="../../../../../org/apache/hadoop/mapred/join/ResetableIterator.html" title="type parameter in ResetableIterator">T</A> val)</CODE> |
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174 | |
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175 | <BR> |
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176 | Assign next value to actual.</TD> |
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177 | </TR> |
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178 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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179 | <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
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180 | <CODE> boolean</CODE></FONT></TD> |
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181 | <TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/join/ResetableIterator.html#replay(T)">replay</A></B>(<A HREF="../../../../../org/apache/hadoop/mapred/join/ResetableIterator.html" title="type parameter in ResetableIterator">T</A> val)</CODE> |
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182 | |
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183 | <BR> |
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184 | Assign last value returned to actual.</TD> |
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185 | </TR> |
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186 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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187 | <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
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188 | <CODE> void</CODE></FONT></TD> |
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189 | <TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/join/ResetableIterator.html#reset()">reset</A></B>()</CODE> |
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190 | |
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191 | <BR> |
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192 | Set iterator to return to the start of its range.</TD> |
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193 | </TR> |
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194 | </TABLE> |
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195 | |
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196 | <P> |
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197 | |
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198 | <!-- ============ METHOD DETAIL ========== --> |
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199 | |
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200 | <A NAME="method_detail"><!-- --></A> |
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203 | <TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2"> |
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204 | <B>Method Detail</B></FONT></TH> |
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205 | </TR> |
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206 | </TABLE> |
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207 | |
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208 | <A NAME="hasNext()"><!-- --></A><H3> |
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209 | hasNext</H3> |
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210 | <PRE> |
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211 | boolean <B>hasNext</B>()</PRE> |
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212 | <DL> |
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213 | <DD>True if a call to next may return a value. This is permitted false |
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214 | positives, but not false negatives. |
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215 | <P> |
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216 | <DD><DL> |
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217 | </DL> |
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218 | </DD> |
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219 | </DL> |
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220 | <HR> |
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221 | |
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222 | <A NAME="next(org.apache.hadoop.io.Writable)"><!-- --></A><A NAME="next(T)"><!-- --></A><H3> |
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223 | next</H3> |
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224 | <PRE> |
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225 | boolean <B>next</B>(<A HREF="../../../../../org/apache/hadoop/mapred/join/ResetableIterator.html" title="type parameter in ResetableIterator">T</A> val) |
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226 | 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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227 | <DL> |
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228 | <DD>Assign next value to actual. |
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229 | It is required that elements added to a ResetableIterator be returned in |
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230 | the same order after a call to <A HREF="../../../../../org/apache/hadoop/mapred/join/ResetableIterator.html#reset()"><CODE>reset()</CODE></A> (FIFO). |
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231 | |
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232 | Note that a call to this may fail for nested joins (i.e. more elements |
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233 | available, but none satisfying the constraints of the join) |
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234 | <P> |
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235 | <DD><DL> |
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236 | |
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237 | <DT><B>Throws:</B> |
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238 | <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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239 | </DD> |
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240 | </DL> |
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241 | <HR> |
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242 | |
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243 | <A NAME="replay(org.apache.hadoop.io.Writable)"><!-- --></A><A NAME="replay(T)"><!-- --></A><H3> |
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244 | replay</H3> |
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245 | <PRE> |
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246 | boolean <B>replay</B>(<A HREF="../../../../../org/apache/hadoop/mapred/join/ResetableIterator.html" title="type parameter in ResetableIterator">T</A> val) |
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247 | 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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248 | <DL> |
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249 | <DD>Assign last value returned to actual. |
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250 | <P> |
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251 | <DD><DL> |
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252 | |
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253 | <DT><B>Throws:</B> |
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254 | <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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255 | </DD> |
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256 | </DL> |
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257 | <HR> |
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258 | |
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259 | <A NAME="reset()"><!-- --></A><H3> |
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260 | reset</H3> |
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261 | <PRE> |
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262 | void <B>reset</B>()</PRE> |
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263 | <DL> |
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264 | <DD>Set iterator to return to the start of its range. Must be called after |
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265 | calling <A HREF="../../../../../org/apache/hadoop/mapred/join/ResetableIterator.html#add(T)"><CODE>add(T)</CODE></A> to avoid a ConcurrentModificationException. |
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266 | <P> |
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267 | <DD><DL> |
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268 | </DL> |
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269 | </DD> |
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270 | </DL> |
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271 | <HR> |
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272 | |
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273 | <A NAME="add(org.apache.hadoop.io.Writable)"><!-- --></A><A NAME="add(T)"><!-- --></A><H3> |
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274 | add</H3> |
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275 | <PRE> |
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276 | void <B>add</B>(<A HREF="../../../../../org/apache/hadoop/mapred/join/ResetableIterator.html" title="type parameter in ResetableIterator">T</A> item) |
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277 | 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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278 | <DL> |
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279 | <DD>Add an element to the collection of elements to iterate over. |
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280 | <P> |
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281 | <DD><DL> |
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282 | |
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283 | <DT><B>Throws:</B> |
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284 | <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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285 | </DD> |
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286 | </DL> |
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287 | <HR> |
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288 | |
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289 | <A NAME="close()"><!-- --></A><H3> |
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290 | close</H3> |
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291 | <PRE> |
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292 | void <B>close</B>() |
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293 | 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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294 | <DL> |
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295 | <DD>Close datasources and release resources. Calling methods on the iterator |
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296 | after calling close has undefined behavior. |
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297 | <P> |
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298 | <DD><DL> |
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299 | |
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300 | <DT><B>Throws:</B> |
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301 | <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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302 | </DD> |
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303 | </DL> |
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304 | <HR> |
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305 | |
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306 | <A NAME="clear()"><!-- --></A><H3> |
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307 | clear</H3> |
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308 | <PRE> |
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309 | void <B>clear</B>()</PRE> |
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310 | <DL> |
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311 | <DD>Close datasources, but do not release internal resources. Calling this |
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312 | method should permit the object to be reused with a different datasource. |
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313 | <P> |
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314 | <DD><DL> |
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315 | </DL> |
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316 | </DD> |
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317 | </DL> |
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318 | <!-- ========= END OF CLASS DATA ========= --> |
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