KezvhLib/lib/com.google.com.collect/javadoc/com/google/common/collect/Collections2.html

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  87 com.google.common.collect</FONT>
  88 <BR>
  89 Class Collections2</H2>
  90 <PRE>
  91 <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html" title="class or interface in java.lang">java.lang.Object</A>
  92   <IMG SRC="../../../../resources/inherit.gif" ALT="extended by "><B>com.google.common.collect.Collections2</B>
  93 </PRE>
  94 <HR>
  95 <DL>
  96 <DT><PRE>public final class <B>Collections2</B><DT>extends <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A></DL>
  97 </PRE>
  98
  99 <P>
 100 Provides static methods for working with <code>Collection</code> instances.
 101 <P>
 102
 103 <P>
 104 <DL>
 105 <DT><B>Author:</B></DT>
 106   <DD>Chris Povirk, Mike Bostock, Jared Levy</DD>
 107 </DL>
 108 <HR>
 109
 110 <P>
 111
 112 <!-- ========== METHOD SUMMARY =========== -->
 113
 114 <A NAME="method_summary"><!-- --></A>
 115 <TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
 116 <TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
 117 <TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
 118 <B>Method Summary</B></FONT></TH>
 119 </TR>
 120 <TR BGCOLOR="white" CLASS="TableRowColor">
 121 <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
 122 <CODE>static
 123 <TABLE BORDER="0" CELLPADDING="0" CELLSPACING="0" SUMMARY="">
 124 <TR ALIGN="right" VALIGN="">
 125 <TD NOWRAP><FONT SIZE="-1">
 126 <CODE>&lt;T&gt; <A HREF="http://java.sun.com/javase/6/docs/api/java/util/Collection.html" title="class or interface in java.util">Collection</A>&lt;T&gt;</CODE></FONT></TD>
 127 </TR>
 128 </TABLE>
 129 </CODE></FONT></TD>
 130 <TD><CODE><B><A HREF="../../../../com/google/common/collect/Collections2.html#filter(java.util.Collection, com.google.common.base.Predicate)">filter</A></B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/util/Collection.html" title="class or interface in java.util">Collection</A>&lt;T&gt;&nbsp;unfiltered,
 131        <A HREF="../../../../com/google/common/base/Predicate.html" title="interface in com.google.common.base">Predicate</A>&lt;? super T&gt;&nbsp;predicate)</CODE>
 132
 133 <BR>
 134 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the elements of <code>unfiltered</code> that satisfy a predicate.</TD>
 135 </TR>
 136 <TR BGCOLOR="white" CLASS="TableRowColor">
 137 <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
 138 <CODE>static
 139 <TABLE BORDER="0" CELLPADDING="0" CELLSPACING="0" SUMMARY="">
 140 <TR ALIGN="right" VALIGN="">
 141 <TD NOWRAP><FONT SIZE="-1">
 142 <CODE>&lt;T&gt; <A HREF="http://java.sun.com/javase/6/docs/api/java/util/Collection.html" title="class or interface in java.util">Collection</A>&lt;T&gt;</CODE></FONT></TD>
 143 </TR>
 144 </TABLE>
 145 </CODE></FONT></TD>
 146 <TD><CODE><B><A HREF="../../../../com/google/common/collect/Collections2.html#forIterable(java.lang.Iterable)">forIterable</A></B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Iterable.html" title="class or interface in java.lang">Iterable</A>&lt;T&gt;&nbsp;iterable)</CODE>
 147
 148 <BR>
 149 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns a limited <A HREF="http://java.sun.com/javase/6/docs/api/java/util/Collection.html" title="class or interface in java.util"><CODE>Collection</CODE></A> view of the given <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Iterable.html" title="class or interface in java.lang"><CODE>Iterable</CODE></A>, or
 150  the <code>Iterable</code> itself if it is already a <code>Collection</code> (in which
 151  case the rest of this documentation does not apply).</TD>
 152 </TR>
 153 </TABLE>
 154 &nbsp;<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
 155 <TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
 156 <TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
 157 <TH ALIGN="left"><B>Methods inherited from class java.lang.<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A></B></TH>
 158 </TR>
 159 <TR BGCOLOR="white" CLASS="TableRowColor">
 160 <TD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html#clone()" title="class or interface in java.lang">clone</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html#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#finalize()" title="class or interface in java.lang">finalize</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html#getClass()" title="class or interface in java.lang">getClass</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html#hashCode()" title="class or interface in java.lang">hashCode</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html#notify()" title="class or interface in java.lang">notify</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html#notifyAll()" title="class or interface in java.lang">notifyAll</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html#toString()" title="class or interface in java.lang">toString</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html#wait()" title="class or interface in java.lang">wait</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html#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#wait(long, int)" title="class or interface in java.lang">wait</A></CODE></TD>
 161 </TR>
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 172 <B>Method Detail</B></FONT></TH>
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 174 </TABLE>
 175
 176 <A NAME="forIterable(java.lang.Iterable)"><!-- --></A><H3>
 177 forIterable</H3>
 178 <PRE>
 179 public static &lt;T&gt; <A HREF="http://java.sun.com/javase/6/docs/api/java/util/Collection.html" title="class or interface in java.util">Collection</A>&lt;T&gt; <B>forIterable</B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Iterable.html" title="class or interface in java.lang">Iterable</A>&lt;T&gt;&nbsp;iterable)</PRE>
 180 <DL>
 181 <DD>Returns a limited <A HREF="http://java.sun.com/javase/6/docs/api/java/util/Collection.html" title="class or interface in java.util"><CODE>Collection</CODE></A> view of the given <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Iterable.html" title="class or interface in java.lang"><CODE>Iterable</CODE></A>, or
 182  the <code>Iterable</code> itself if it is already a <code>Collection</code> (in which
 183  case the rest of this documentation does not apply). The returned
 184  collection is not appropriate for general use for a number of reasons.
 185  Instead, it exists to provide frequently desired methods for dealing with
 186  <code>Iterable</code> objects -- such as
 187  <A HREF="http://java.sun.com/javase/6/docs/api/java/util/Collection.html#removeAll(java.util.Collection)" title="class or interface in java.util"><CODE>Collection.removeAll(Collection)</CODE></A> -- through the familiar
 188  <code>Collection</code> interface. To treat the contents of an <code>Iterable</code>
 189  as a full-fledged, performant <code>Collection</code>, it is recommended that
 190  clients call a method like <A HREF="../../../../com/google/common/collect/ImmutableSet.html#copyOf(java.lang.Iterable)"><CODE>ImmutableSet.copyOf(Iterable)</CODE></A> or
 191  <A HREF="../../../../com/google/common/collect/Iterables.html#addAll(java.util.Collection, java.lang.Iterable)"><CODE>Iterables.addAll(Collection, Iterable)</CODE></A> to dump the contents of the
 192  <code>Iterable</code> into a standard <code>Collection</code>. For cases in which a
 193  view of the <code>Iterable</code> is required, <code>forIterable()</code> is
 194  available.
 195
 196  <p>A number of limitations result from building on the <code>Iterable</code>
 197  interface. Notably, <code>size()</code>, <code>contains()</code>, and many other
 198  methods of the returned collection are O(n). The returned collection does
 199  not support the insertion of items. Removal of elements is supported if the
 200  underlying <code>Iterable</code> supports it, and all non-mutative operations
 201  are supported. Additionally, each method call on the returned collection
 202  calls <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Iterable.html#iterator()" title="class or interface in java.lang"><CODE>Iterable.iterator()</CODE></A> on the source <code>Iterable</code>. Thus, if
 203  you wish to call more than one method on the collection or to otherwise
 204  access the contents of the <code>Iterable</code> after calling a method, the
 205  <code>Iterable</code> must support the creation of multiple iterators.
 206
 207  <p><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html#equals(java.lang.Object)" title="class or interface in java.lang"><CODE>Object.equals(Object)</CODE></A> and <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html#hashCode()" title="class or interface in java.lang"><CODE>Object.hashCode()</CODE></A> are inherited from
 208  <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html" title="class or interface in java.lang"><CODE>Object</CODE></A>, as the returned <code>Collection</code> is not an implementation
 209  of any additional interface, such as <A HREF="http://java.sun.com/javase/6/docs/api/java/util/List.html" title="class or interface in java.util"><CODE>List</CODE></A> or
 210  <A HREF="http://java.sun.com/javase/6/docs/api/java/util/Set.html" title="class or interface in java.util"><CODE>Set</CODE></A>.
 211
 212  <p>The behavior of the returned collection's iterator in the face of
 213  concurrent structural modification of the returned collection or of the
 214  underlying <code>Iterable</code> is undefined, and no guarantee is made that the
 215  objects are fail-fast.
 216
 217  <p><b>Usage Example</b>
 218
 219  <pre>
 220  // Remove all instances of "foo" from an Iterable:
 221  Collections2.forIterable(iterable).removeAll(ImmutableSet.of("foo"));
 222  </pre>
 223 <P>
 224 <DD><DL>
 225 </DL>
 226 </DD>
 227 </DL>
 228 <HR>
 229
 230 <A NAME="filter(java.util.Collection, com.google.common.base.Predicate)"><!-- --></A><H3>
 231 filter</H3>
 232 <PRE>
 233 public static &lt;T&gt; <A HREF="http://java.sun.com/javase/6/docs/api/java/util/Collection.html" title="class or interface in java.util">Collection</A>&lt;T&gt; <B>filter</B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/util/Collection.html" title="class or interface in java.util">Collection</A>&lt;T&gt;&nbsp;unfiltered,
 234                                        <A HREF="../../../../com/google/common/base/Predicate.html" title="interface in com.google.common.base">Predicate</A>&lt;? super T&gt;&nbsp;predicate)</PRE>
 235 <DL>
 236 <DD>Returns the elements of <code>unfiltered</code> that satisfy a predicate. The
 237  returned collection is a live view of <code>unfiltered</code>; changes to one
 238  affect the other.
 239
 240  <p>The resulting collection's iterator does not support <code>remove()</code>,
 241  but all other collection methods are supported. The collection's
 242  <code>add()</code> and <code>addAll()</code> methods throw an
 243  <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/IllegalArgumentException.html" title="class or interface in java.lang"><CODE>IllegalArgumentException</CODE></A> if an element that doesn't satisfy the
 244  predicate is provided. When methods such as <code>removeAll()</code> and
 245  <code>clear()</code> are called on the filtered collection, only elements that
 246  satisfy the filter will be removed from the underlying collection.
 247
 248  <p>The returned collection isn't threadsafe or serializable, even if
 249  <code>unfiltered</code> is.
 250
 251  <p>Many of the filtered collection's methods, such as <code>size()</code>,
 252  iterate across every element in the underlying collection and determine
 253  which elements satisfy the filter. When a live view is <i>not</i> needed,
 254  it may be faster to copy the filtered collection and use the copy.
 255
 256  <p>The <code>clear()</code>, <code>removeAll()</code>, and <code>retainAll()</code>
 257  methods all call <A HREF="http://java.sun.com/javase/6/docs/api/java/util/Iterator.html#remove()" title="class or interface in java.util"><CODE>Iterator.remove()</CODE></A> on the underlying collection's
 258  iterator. Consequently, methods like the following throw an
 259  <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/UnsupportedOperationException.html" title="class or interface in java.lang"><CODE>UnsupportedOperationException</CODE></A>.
 260  <pre>  Collections2.filter(Collections2.filter(collection, predicate1),
 261      predicate2)).clear();</pre>
 262  Instead, call
 263  <A HREF="../../../../com/google/common/base/Predicates.html#and(com.google.common.base.Predicate, com.google.common.base.Predicate)"><CODE>Predicates.and(Predicate, Predicate)</CODE></A> to
 264  combine the predicates and pass the combined predicate to this method.
 265 <P>
 266 <DD><DL>
 267 </DL>
 268 </DD>
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