KezvhLib/lib/org.apache.commons.collections/apidocs/org/apache/commons/collections/BidiMap.html

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   8 BidiMap (Commons Collections 3.2.1 API)
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  87 <H2>
  88 <FONT SIZE="-1">
  89 org.apache.commons.collections</FONT>
  90 <BR>
  91 Interface BidiMap</H2>
  92 <DL>
  93 <DT><B>All Superinterfaces:</B> <DD><A HREF="../../../../org/apache/commons/collections/IterableMap.html" title="interface in org.apache.commons.collections">IterableMap</A>, java.util.Map</DD>
  94 </DL>
  95 <DL>
  96 <DT><B>All Known Subinterfaces:</B> <DD><A HREF="../../../../org/apache/commons/collections/OrderedBidiMap.html" title="interface in org.apache.commons.collections">OrderedBidiMap</A>, <A HREF="../../../../org/apache/commons/collections/SortedBidiMap.html" title="interface in org.apache.commons.collections">SortedBidiMap</A></DD>
  97 </DL>
  98 <DL>
  99 <DT><B>All Known Implementing Classes:</B> <DD><A HREF="../../../../org/apache/commons/collections/bidimap/AbstractBidiMapDecorator.html" title="class in org.apache.commons.collections.bidimap">AbstractBidiMapDecorator</A>, <A HREF="../../../../org/apache/commons/collections/bidimap/AbstractDualBidiMap.html" title="class in org.apache.commons.collections.bidimap">AbstractDualBidiMap</A>, <A HREF="../../../../org/apache/commons/collections/bidimap/AbstractOrderedBidiMapDecorator.html" title="class in org.apache.commons.collections.bidimap">AbstractOrderedBidiMapDecorator</A>, <A HREF="../../../../org/apache/commons/collections/bidimap/AbstractSortedBidiMapDecorator.html" title="class in org.apache.commons.collections.bidimap">AbstractSortedBidiMapDecorator</A>, <A HREF="../../../../org/apache/commons/collections/bidimap/DualHashBidiMap.html" title="class in org.apache.commons.collections.bidimap">DualHashBidiMap</A>, <A HREF="../../../../org/apache/commons/collections/bidimap/DualTreeBidiMap.html" title="class in org.apache.commons.collections.bidimap">DualTreeBidiMap</A>, <A HREF="../../../../org/apache/commons/collections/bidimap/TreeBidiMap.html" title="class in org.apache.commons.collections.bidimap">TreeBidiMap</A>, <A HREF="../../../../org/apache/commons/collections/bidimap/UnmodifiableBidiMap.html" title="class in org.apache.commons.collections.bidimap">UnmodifiableBidiMap</A>, <A HREF="../../../../org/apache/commons/collections/bidimap/UnmodifiableOrderedBidiMap.html" title="class in org.apache.commons.collections.bidimap">UnmodifiableOrderedBidiMap</A>, <A HREF="../../../../org/apache/commons/collections/bidimap/UnmodifiableSortedBidiMap.html" title="class in org.apache.commons.collections.bidimap">UnmodifiableSortedBidiMap</A></DD>
 100 </DL>
 101 <HR>
 102 <DL>
 103 <DT><PRE>public interface <B>BidiMap</B><DT>extends <A HREF="../../../../org/apache/commons/collections/IterableMap.html" title="interface in org.apache.commons.collections">IterableMap</A></DL>
 104 </PRE>
 105
 106 <P>
 107 Defines a map that allows bidirectional lookup between key and values.
 108  <p>
 109  This extended <code>Map</code> represents a mapping where a key may
 110  lookup a value and a value may lookup a key with equal ease.
 111  This interface extends <code>Map</code> and so may be used anywhere a map
 112  is required. The interface provides an inverse map view, enabling
 113  full access to both directions of the <code>BidiMap</code>.
 114  <p>
 115  Implementations should allow a value to be looked up from a key and
 116  a key to be looked up from a value with equal performance.
 117  <p>
 118  This map enforces the restriction that there is a 1:1 relation between
 119  keys and values, meaning that multiple keys cannot map to the same value.
 120  This is required so that "inverting" the map results in a map without
 121  duplicate keys. See the <A HREF="../../../../org/apache/commons/collections/BidiMap.html#put(java.lang.Object, java.lang.Object)"><CODE>put(java.lang.Object, java.lang.Object)</CODE></A> method description for more information.
 122 <P>
 123
 124 <P>
 125 <DL>
 126 <DT><B>Since:</B></DT>
 127   <DD>Commons Collections 3.0</DD>
 128 <DT><B>Version:</B></DT>
 129   <DD>$Revision: 646777 $ $Date: 2008-04-10 13:33:15 +0100 (Thu, 10 Apr 2008) $</DD>
 130 <DT><B>Author:</B></DT>
 131   <DD>Stephen Colebourne</DD>
 132 </DL>
 133 <HR>
 134
 135 <P>
 136 <!-- ======== NESTED CLASS SUMMARY ======== -->
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 142 <B>Nested Class Summary</B></FONT></TH>
 143 </TR>
 144 </TABLE>
 145 &nbsp;<A NAME="nested_classes_inherited_from_class_java.util.Map"><!-- --></A>
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 148 <TH ALIGN="left"><B>Nested classes/interfaces inherited from interface java.util.Map</B></TH>
 149 </TR>
 150 <TR BGCOLOR="white" CLASS="TableRowColor">
 151 <TD><CODE>java.util.Map.Entry</CODE></TD>
 152 </TR>
 153 </TABLE>
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 162 <B>Method Summary</B></FONT></TH>
 163 </TR>
 164 <TR BGCOLOR="white" CLASS="TableRowColor">
 165 <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
 166 <CODE>&nbsp;java.lang.Object</CODE></FONT></TD>
 167 <TD><CODE><B><A HREF="../../../../org/apache/commons/collections/BidiMap.html#getKey(java.lang.Object)">getKey</A></B>(java.lang.Object&nbsp;value)</CODE>
 168
 169 <BR>
 170 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Gets the key that is currently mapped to the specified value.</TD>
 171 </TR>
 172 <TR BGCOLOR="white" CLASS="TableRowColor">
 173 <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
 174 <CODE>&nbsp;<A HREF="../../../../org/apache/commons/collections/BidiMap.html" title="interface in org.apache.commons.collections">BidiMap</A></CODE></FONT></TD>
 175 <TD><CODE><B><A HREF="../../../../org/apache/commons/collections/BidiMap.html#inverseBidiMap()">inverseBidiMap</A></B>()</CODE>
 176
 177 <BR>
 178 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Gets a view of this map where the keys and values are reversed.</TD>
 179 </TR>
 180 <TR BGCOLOR="white" CLASS="TableRowColor">
 181 <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
 182 <CODE>&nbsp;<A HREF="../../../../org/apache/commons/collections/MapIterator.html" title="interface in org.apache.commons.collections">MapIterator</A></CODE></FONT></TD>
 183 <TD><CODE><B><A HREF="../../../../org/apache/commons/collections/BidiMap.html#mapIterator()">mapIterator</A></B>()</CODE>
 184
 185 <BR>
 186 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Obtains a <code>MapIterator</code> over the map.</TD>
 187 </TR>
 188 <TR BGCOLOR="white" CLASS="TableRowColor">
 189 <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
 190 <CODE>&nbsp;java.lang.Object</CODE></FONT></TD>
 191 <TD><CODE><B><A HREF="../../../../org/apache/commons/collections/BidiMap.html#put(java.lang.Object, java.lang.Object)">put</A></B>(java.lang.Object&nbsp;key,
 192     java.lang.Object&nbsp;value)</CODE>
 193
 194 <BR>
 195 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Puts the key-value pair into the map, replacing any previous pair.</TD>
 196 </TR>
 197 <TR BGCOLOR="white" CLASS="TableRowColor">
 198 <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
 199 <CODE>&nbsp;java.lang.Object</CODE></FONT></TD>
 200 <TD><CODE><B><A HREF="../../../../org/apache/commons/collections/BidiMap.html#removeValue(java.lang.Object)">removeValue</A></B>(java.lang.Object&nbsp;value)</CODE>
 201
 202 <BR>
 203 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Removes the key-value pair that is currently mapped to the specified
 204  value (optional operation).</TD>
 205 </TR>
 206 </TABLE>
 207 &nbsp;<A NAME="methods_inherited_from_class_java.util.Map"><!-- --></A>
 208 <TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
 209 <TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
 210 <TH ALIGN="left"><B>Methods inherited from interface java.util.Map</B></TH>
 211 </TR>
 212 <TR BGCOLOR="white" CLASS="TableRowColor">
 213 <TD><CODE>clear, containsKey, containsValue, entrySet, equals, get, hashCode, isEmpty, keySet, putAll, remove, size, values</CODE></TD>
 214 </TR>
 215 </TABLE>
 216 &nbsp;
 217 <P>
 218
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 225 <B>Method Detail</B></FONT></TH>
 226 </TR>
 227 </TABLE>
 228
 229 <A NAME="mapIterator()"><!-- --></A><H3>
 230 mapIterator</H3>
 231 <PRE>
 232 <A HREF="../../../../org/apache/commons/collections/MapIterator.html" title="interface in org.apache.commons.collections">MapIterator</A> <B>mapIterator</B>()</PRE>
 233 <DL>
 234 <DD>Obtains a <code>MapIterator</code> over the map.
 235  <p>
 236  A map iterator is an efficient way of iterating over maps.
 237  It does not require that the map is stored using Map Entry objects
 238  which can increase performance.
 239  <pre>
 240  BidiMap map = new DualHashBidiMap();
 241  MapIterator it = map.mapIterator();
 242  while (it.hasNext()) {
 243    Object key = it.next();
 244    Object value = it.getValue();
 245    it.setValue("newValue");
 246  }
 247  </pre>
 248 <P>
 249 <DD><DL>
 250 <DT><B>Specified by:</B><DD><CODE><A HREF="../../../../org/apache/commons/collections/IterableMap.html#mapIterator()">mapIterator</A></CODE> in interface <CODE><A HREF="../../../../org/apache/commons/collections/IterableMap.html" title="interface in org.apache.commons.collections">IterableMap</A></CODE></DL>
 251 </DD>
 252 <DD><DL>
 253
 254 <DT><B>Returns:</B><DD>a map iterator</DL>
 255 </DD>
 256 </DL>
 257 <HR>
 258
 259 <A NAME="put(java.lang.Object, java.lang.Object)"><!-- --></A><H3>
 260 put</H3>
 261 <PRE>
 262 java.lang.Object <B>put</B>(java.lang.Object&nbsp;key,
 263                      java.lang.Object&nbsp;value)</PRE>
 264 <DL>
 265 <DD>Puts the key-value pair into the map, replacing any previous pair.
 266  <p>
 267  When adding a key-value pair, the value may already exist in the map
 268  against a different key. That mapping is removed, to ensure that the
 269  value only occurs once in the inverse map.
 270  <pre>
 271   BidiMap map1 = new DualHashBidiMap();
 272   map.put("A","B");  // contains A mapped to B, as per Map
 273   map.put("A","C");  // contains A mapped to C, as per Map
 274
 275   BidiMap map2 = new DualHashBidiMap();
 276   map.put("A","B");  // contains A mapped to B, as per Map
 277   map.put("C","B");  // contains C mapped to B, key A is removed
 278  </pre>
 279 <P>
 280 <DD><DL>
 281 <DT><B>Specified by:</B><DD><CODE>put</CODE> in interface <CODE>java.util.Map</CODE></DL>
 282 </DD>
 283 <DD><DL>
 284 <DT><B>Parameters:</B><DD><CODE>key</CODE> - the key to store<DD><CODE>value</CODE> - the value to store
 285 <DT><B>Returns:</B><DD>the previous value mapped to this key
 286 <DT><B>Throws:</B>
 287 <DD><CODE>java.lang.UnsupportedOperationException</CODE> - if the <code>put</code> method is not supported
 288 <DD><CODE>java.lang.ClassCastException</CODE> - (optional) if the map limits the type of the
 289   value and the specified value is inappropriate
 290 <DD><CODE>java.lang.IllegalArgumentException</CODE> - (optional) if the map limits the values
 291   in some way and the value was invalid
 292 <DD><CODE>java.lang.NullPointerException</CODE> - (optional) if the map limits the values to
 293   non-null and null was specified</DL>
 294 </DD>
 295 </DL>
 296 <HR>
 297
 298 <A NAME="getKey(java.lang.Object)"><!-- --></A><H3>
 299 getKey</H3>
 300 <PRE>
 301 java.lang.Object <B>getKey</B>(java.lang.Object&nbsp;value)</PRE>
 302 <DL>
 303 <DD>Gets the key that is currently mapped to the specified value.
 304  <p>
 305  If the value is not contained in the map, <code>null</code> is returned.
 306  <p>
 307  Implementations should seek to make this method perform equally as well
 308  as <code>get(Object)</code>.
 309 <P>
 310 <DD><DL>
 311 </DL>
 312 </DD>
 313 <DD><DL>
 314 <DT><B>Parameters:</B><DD><CODE>value</CODE> - the value to find the key for
 315 <DT><B>Returns:</B><DD>the mapped key, or <code>null</code> if not found
 316 <DT><B>Throws:</B>
 317 <DD><CODE>java.lang.ClassCastException</CODE> - (optional) if the map limits the type of the
 318   value and the specified value is inappropriate
 319 <DD><CODE>java.lang.NullPointerException</CODE> - (optional) if the map limits the values to
 320   non-null and null was specified</DL>
 321 </DD>
 322 </DL>
 323 <HR>
 324
 325 <A NAME="removeValue(java.lang.Object)"><!-- --></A><H3>
 326 removeValue</H3>
 327 <PRE>
 328 java.lang.Object <B>removeValue</B>(java.lang.Object&nbsp;value)</PRE>
 329 <DL>
 330 <DD>Removes the key-value pair that is currently mapped to the specified
 331  value (optional operation).
 332  <p>
 333  If the value is not contained in the map, <code>null</code> is returned.
 334  <p>
 335  Implementations should seek to make this method perform equally as well
 336  as <code>remove(Object)</code>.
 337 <P>
 338 <DD><DL>
 339 </DL>
 340 </DD>
 341 <DD><DL>
 342 <DT><B>Parameters:</B><DD><CODE>value</CODE> - the value to find the key-value pair for
 343 <DT><B>Returns:</B><DD>the key that was removed, <code>null</code> if nothing removed
 344 <DT><B>Throws:</B>
 345 <DD><CODE>java.lang.ClassCastException</CODE> - (optional) if the map limits the type of the
 346   value and the specified value is inappropriate
 347 <DD><CODE>java.lang.NullPointerException</CODE> - (optional) if the map limits the values to
 348   non-null and null was specified
 349 <DD><CODE>java.lang.UnsupportedOperationException</CODE> - if this method is not supported
 350   by the implementation</DL>
 351 </DD>
 352 </DL>
 353 <HR>
 354
 355 <A NAME="inverseBidiMap()"><!-- --></A><H3>
 356 inverseBidiMap</H3>
 357 <PRE>
 358 <A HREF="../../../../org/apache/commons/collections/BidiMap.html" title="interface in org.apache.commons.collections">BidiMap</A> <B>inverseBidiMap</B>()</PRE>
 359 <DL>
 360 <DD>Gets a view of this map where the keys and values are reversed.
 361  <p>
 362  Changes to one map will be visible in the other and vice versa.
 363  This enables both directions of the map to be accessed as a <code>Map</code>.
 364  <p>
 365  Implementations should seek to avoid creating a new object every time this
 366  method is called. See <code>AbstractMap.values()</code> etc. Calling this
 367  method on the inverse map should return the original.
 368 <P>
 369 <DD><DL>
 370 </DL>
 371 </DD>
 372 <DD><DL>
 373
 374 <DT><B>Returns:</B><DD>an inverted bidirectional map</DL>
 375 </DD>
 376 </DL>
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