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CollectionUtils (Apache Shiro 1.2.3 API)
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org.apache.shiro.util</FONT>
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Class CollectionUtils</H2>
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<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>
<IMG SRC="../../../../resources/inherit.gif" ALT="extended by "><B>org.apache.shiro.util.CollectionUtils</B>
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<DT><PRE>public class <A HREF="../../../../src-html/org/apache/shiro/util/CollectionUtils.html#line.30"><B>CollectionUtils</B></A><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></DL>
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<P>
Static helper class for use dealing with Collections.
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<DT><B>Since:</B></DT>
<DD>0.9</DD>
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<TD><CODE><B><A HREF="../../../../org/apache/shiro/util/CollectionUtils.html#CollectionUtils()">CollectionUtils</A></B>()</CODE>
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<CODE>static
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<TD NOWRAP><FONT SIZE="-1">
<CODE>&lt;E&gt; <A HREF="http://java.sun.com/javase/6/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</A>&lt;E&gt;</CODE></FONT></TD>
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</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/shiro/util/CollectionUtils.html#asList(E...)">asList</A></B>(E...&nbsp;elements)</CODE>
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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
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<CODE>static
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<TD NOWRAP><FONT SIZE="-1">
<CODE>&lt;E&gt; <A HREF="http://java.sun.com/javase/6/docs/api/java/util/Set.html?is-external=true" title="class or interface in java.util">Set</A>&lt;E&gt;</CODE></FONT></TD>
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</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/shiro/util/CollectionUtils.html#asSet(E...)">asSet</A></B>(E...&nbsp;elements)</CODE>
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<CODE>static&nbsp;boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/shiro/util/CollectionUtils.html#isEmpty(java.util.Collection)">isEmpty</A></B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</A>&nbsp;c)</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns <code>true</code> if the specified <code>Collection</code> is <code>null</code> or <A HREF="http://java.sun.com/javase/6/docs/api/java/util/Collection.html?is-external=true#isEmpty()" title="class or interface in java.util"><CODE>empty</CODE></A>,
<code>false</code> otherwise.</TD>
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<CODE>static&nbsp;boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/shiro/util/CollectionUtils.html#isEmpty(java.util.Map)">isEmpty</A></B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</A>&nbsp;m)</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns <code>true</code> if the specified <code>Map</code> is <code>null</code> or <A HREF="http://java.sun.com/javase/6/docs/api/java/util/Map.html?is-external=true#isEmpty()" title="class or interface in java.util"><CODE>empty</CODE></A>,
<code>false</code> otherwise.</TD>
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<CODE>static&nbsp;boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/shiro/util/CollectionUtils.html#isEmpty(org.apache.shiro.subject.PrincipalCollection)">isEmpty</A></B>(<A HREF="../../../../org/apache/shiro/subject/PrincipalCollection.html" title="interface in org.apache.shiro.subject">PrincipalCollection</A>&nbsp;principals)</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns <code>true</code> if the specified <code>PrincipalCollection</code> is <code>null</code> or
<A HREF="../../../../org/apache/shiro/subject/PrincipalCollection.html#isEmpty()"><CODE>empty</CODE></A>, <code>false</code> otherwise.</TD>
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<CODE>static&nbsp;int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/shiro/util/CollectionUtils.html#size(java.util.Collection)">size</A></B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</A>&nbsp;c)</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the size of the specified collection or <code>0</code> if the collection is <code>null</code>.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static&nbsp;int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/shiro/util/CollectionUtils.html#size(java.util.Map)">size</A></B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</A>&nbsp;m)</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the size of the specified map or <code>0</code> if the map is <code>null</code>.</TD>
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<A NAME="CollectionUtils()"><!-- --></A><H3>
CollectionUtils</H3>
<PRE>
public <A HREF="../../../../src-html/org/apache/shiro/util/CollectionUtils.html#line.30"><B>CollectionUtils</B></A>()</PRE>
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<A NAME="asSet(java.lang.Object[])"><!-- --></A><A NAME="asSet(E...)"><!-- --></A><H3>
asSet</H3>
<PRE>
public static &lt;E&gt; <A HREF="http://java.sun.com/javase/6/docs/api/java/util/Set.html?is-external=true" title="class or interface in java.util">Set</A>&lt;E&gt; <A HREF="../../../../src-html/org/apache/shiro/util/CollectionUtils.html#line.34"><B>asSet</B></A>(E...&nbsp;elements)</PRE>
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<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="isEmpty(java.util.Collection)"><!-- --></A><H3>
isEmpty</H3>
<PRE>
public static boolean <A HREF="../../../../src-html/org/apache/shiro/util/CollectionUtils.html#line.52"><B>isEmpty</B></A>(<A HREF="http://java.sun.com/javase/6/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</A>&nbsp;c)</PRE>
<DL>
<DD>Returns <code>true</code> if the specified <code>Collection</code> is <code>null</code> or <A HREF="http://java.sun.com/javase/6/docs/api/java/util/Collection.html?is-external=true#isEmpty()" title="class or interface in java.util"><CODE>empty</CODE></A>,
<code>false</code> otherwise.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>c</CODE> - the collection to check
<DT><B>Returns:</B><DD><code>true</code> if the specified <code>Collection</code> is <code>null</code> or <A HREF="http://java.sun.com/javase/6/docs/api/java/util/Collection.html?is-external=true#isEmpty()" title="class or interface in java.util"><CODE>empty</CODE></A>,
<code>false</code> otherwise.<DT><B>Since:</B></DT>
<DD>1.0</DD>
</DL>
</DD>
</DL>
<HR>
<A NAME="isEmpty(java.util.Map)"><!-- --></A><H3>
isEmpty</H3>
<PRE>
public static boolean <A HREF="../../../../src-html/org/apache/shiro/util/CollectionUtils.html#line.65"><B>isEmpty</B></A>(<A HREF="http://java.sun.com/javase/6/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</A>&nbsp;m)</PRE>
<DL>
<DD>Returns <code>true</code> if the specified <code>Map</code> is <code>null</code> or <A HREF="http://java.sun.com/javase/6/docs/api/java/util/Map.html?is-external=true#isEmpty()" title="class or interface in java.util"><CODE>empty</CODE></A>,
<code>false</code> otherwise.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>m</CODE> - the <code>Map</code> to check
<DT><B>Returns:</B><DD><code>true</code> if the specified <code>Map</code> is <code>null</code> or <A HREF="http://java.sun.com/javase/6/docs/api/java/util/Map.html?is-external=true#isEmpty()" title="class or interface in java.util"><CODE>empty</CODE></A>,
<code>false</code> otherwise.<DT><B>Since:</B></DT>
<DD>1.0</DD>
</DL>
</DD>
</DL>
<HR>
<A NAME="size(java.util.Collection)"><!-- --></A><H3>
size</H3>
<PRE>
public static int <A HREF="../../../../src-html/org/apache/shiro/util/CollectionUtils.html#line.76"><B>size</B></A>(<A HREF="http://java.sun.com/javase/6/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</A>&nbsp;c)</PRE>
<DL>
<DD>Returns the size of the specified collection or <code>0</code> if the collection is <code>null</code>.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>c</CODE> - the collection to check
<DT><B>Returns:</B><DD>the size of the specified collection or <code>0</code> if the collection is <code>null</code>.<DT><B>Since:</B></DT>
<DD>1.2</DD>
</DL>
</DD>
</DL>
<HR>
<A NAME="size(java.util.Map)"><!-- --></A><H3>
size</H3>
<PRE>
public static int <A HREF="../../../../src-html/org/apache/shiro/util/CollectionUtils.html#line.87"><B>size</B></A>(<A HREF="http://java.sun.com/javase/6/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</A>&nbsp;m)</PRE>
<DL>
<DD>Returns the size of the specified map or <code>0</code> if the map is <code>null</code>.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>m</CODE> - the map to check
<DT><B>Returns:</B><DD>the size of the specified map or <code>0</code> if the map is <code>null</code>.<DT><B>Since:</B></DT>
<DD>1.2</DD>
</DL>
</DD>
</DL>
<HR>
<A NAME="isEmpty(org.apache.shiro.subject.PrincipalCollection)"><!-- --></A><H3>
isEmpty</H3>
<PRE>
public static boolean <A HREF="../../../../src-html/org/apache/shiro/util/CollectionUtils.html#line.101"><B>isEmpty</B></A>(<A HREF="../../../../org/apache/shiro/subject/PrincipalCollection.html" title="interface in org.apache.shiro.subject">PrincipalCollection</A>&nbsp;principals)</PRE>
<DL>
<DD>Returns <code>true</code> if the specified <code>PrincipalCollection</code> is <code>null</code> or
<A HREF="../../../../org/apache/shiro/subject/PrincipalCollection.html#isEmpty()"><CODE>empty</CODE></A>, <code>false</code> otherwise.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>principals</CODE> - the principals to check.
<DT><B>Returns:</B><DD><code>true</code> if the specified <code>PrincipalCollection</code> is <code>null</code> or
<A HREF="../../../../org/apache/shiro/subject/PrincipalCollection.html#isEmpty()"><CODE>empty</CODE></A>, <code>false</code> otherwise.<DT><B>Since:</B></DT>
<DD>1.0</DD>
</DL>
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<A NAME="asList(java.lang.Object[])"><!-- --></A><A NAME="asList(E...)"><!-- --></A><H3>
asList</H3>
<PRE>
public static &lt;E&gt; <A HREF="http://java.sun.com/javase/6/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</A>&lt;E&gt; <A HREF="../../../../src-html/org/apache/shiro/util/CollectionUtils.html#line.105"><B>asList</B></A>(E...&nbsp;elements)</PRE>
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