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| ListTool (Velocity Tools 1.2 Documentation)
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| <H2>
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| <FONT SIZE="-1">
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| org.apache.velocity.tools.generic</FONT>
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| <BR>
|
| Class ListTool</H2>
|
| <PRE>
|
| java.lang.Object
|
| <IMG SRC="../../../../../resources/inherit.gif" ALT="extended by"><B>org.apache.velocity.tools.generic.ListTool</B>
|
| </PRE>
|
| <HR>
|
| <DL>
|
| <DT>public class <B>ListTool</B><DT>extends java.lang.Object</DL>
|
|
|
| <P>
|
| Tool for working with Lists and arrays in Velocity templates. |
| It provides a method to get and set specified elements. |
| Also provides methods to perform the following actions to Lists and arrays: |
| <ul> |
| <li>Check if it is empty.</li> |
| <li>Check if it contains a certain element.</li> |
| </ul> |
| |
| <p><pre> |
| Example uses: |
| $primes -> new int[] {2, 3, 5, 7} |
| $list.size($primes) -> 4 |
| $list.get($primes, 2) -> 5 |
| $list.set($primes, 2, 1) -> (primes[2] becomes 1) |
| $list.get($primes, 2) -> 1 |
| $list.isEmpty($primes) -> false |
| $list.contains($primes, 7) -> true |
| |
| Example toolbox.xml config (if you want to use this with VelocityView): |
| <tool> |
| <key>list</key> |
| <scope>application</scope> |
| <class>org.apache.velocity.tools.generic.ListTool</class> |
| </tool> |
| </pre></p> |
| |
| <p>This tool is entirely threadsafe, and has no instance members. |
| It may be used in any scope (request, session, or application). |
| </p>
|
| <P>
|
|
|
| <P>
|
| <DL>
|
| <DT><B>Since:</B></DT> |
| <DD>VelocityTools 1.2</DD> |
| <DT><B>Version:</B></DT> |
| <DD>$Id: $</DD> |
| <DT><B>Author:</B></DT> |
| <DD><a href="mailto:shinobu@ieee.org">Shinobu Kawai</a></DD> |
| </DL>
|
| <HR>
|
|
|
| <P>
|
| <!-- ======== NESTED CLASS SUMMARY ======== -->
|
|
|
|
|
| <!-- =========== FIELD SUMMARY =========== -->
|
|
|
|
|
| <!-- ======== CONSTRUCTOR SUMMARY ======== -->
|
|
|
| <A NAME="constructor_summary"><!-- --></A> |
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|
| <TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
|
| <TD COLSPAN=2><FONT SIZE="+2">
|
| <B>Constructor Summary</B></FONT></TD>
|
| </TR>
|
| <TR BGCOLOR="white" CLASS="TableRowColor">
|
| <TD><CODE><B><A HREF="../../../../../org/apache/velocity/tools/generic/ListTool.html#ListTool()">ListTool</A></B>()</CODE>
|
|
|
| <BR>
|
| Default constructor.</TD>
|
| </TR>
|
| </TABLE>
|
|
|
| <!-- ========== METHOD SUMMARY =========== -->
|
|
|
| <A NAME="method_summary"><!-- --></A> |
| <TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
|
| <TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
|
| <TD COLSPAN=2><FONT SIZE="+2">
|
| <B>Method Summary</B></FONT></TD>
|
| </TR>
|
| <TR BGCOLOR="white" CLASS="TableRowColor">
|
| <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
|
| <CODE>private java.lang.Boolean</CODE></FONT></TD>
|
| <TD><CODE><B><A HREF="../../../../../org/apache/velocity/tools/generic/ListTool.html#arrayContains(java.lang.Object, java.lang.Object)">arrayContains</A></B>(java.lang.Object array, |
| java.lang.Object element)</CODE>
|
|
|
| <BR>
|
| Checks if an array contains a certain element.</TD>
|
| </TR>
|
| <TR BGCOLOR="white" CLASS="TableRowColor">
|
| <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
|
| <CODE> java.lang.Boolean</CODE></FONT></TD>
|
| <TD><CODE><B><A HREF="../../../../../org/apache/velocity/tools/generic/ListTool.html#contains(java.lang.Object, java.lang.Object)">contains</A></B>(java.lang.Object list, |
| java.lang.Object element)</CODE>
|
|
|
| <BR>
|
| Checks if a List/array contains a certain element.</TD>
|
| </TR>
|
| <TR BGCOLOR="white" CLASS="TableRowColor">
|
| <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
|
| <CODE>private boolean</CODE></FONT></TD>
|
| <TD><CODE><B><A HREF="../../../../../org/apache/velocity/tools/generic/ListTool.html#equals(java.lang.Object, java.lang.Object)">equals</A></B>(java.lang.Object what, |
| java.lang.Object with)</CODE>
|
|
|
| <BR>
|
| Check if two objects are equal.</TD>
|
| </TR>
|
| <TR BGCOLOR="white" CLASS="TableRowColor">
|
| <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
|
| <CODE> java.lang.Object</CODE></FONT></TD>
|
| <TD><CODE><B><A HREF="../../../../../org/apache/velocity/tools/generic/ListTool.html#get(java.lang.Object, int)">get</A></B>(java.lang.Object list, |
| int index)</CODE>
|
|
|
| <BR>
|
| Gets the specified element of a List/array.</TD>
|
| </TR>
|
| <TR BGCOLOR="white" CLASS="TableRowColor">
|
| <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
|
| <CODE>private java.lang.Object</CODE></FONT></TD>
|
| <TD><CODE><B><A HREF="../../../../../org/apache/velocity/tools/generic/ListTool.html#getFromArray(java.lang.Object, int)">getFromArray</A></B>(java.lang.Object array, |
| int index)</CODE>
|
|
|
| <BR>
|
| Gets the specified element of an array.</TD>
|
| </TR>
|
| <TR BGCOLOR="white" CLASS="TableRowColor">
|
| <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
|
| <CODE> boolean</CODE></FONT></TD>
|
| <TD><CODE><B><A HREF="../../../../../org/apache/velocity/tools/generic/ListTool.html#isArray(java.lang.Object)">isArray</A></B>(java.lang.Object object)</CODE>
|
|
|
| <BR>
|
| Checks if an object is an array.</TD>
|
| </TR>
|
| <TR BGCOLOR="white" CLASS="TableRowColor">
|
| <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
|
| <CODE> java.lang.Boolean</CODE></FONT></TD>
|
| <TD><CODE><B><A HREF="../../../../../org/apache/velocity/tools/generic/ListTool.html#isEmpty(java.lang.Object)">isEmpty</A></B>(java.lang.Object list)</CODE>
|
|
|
| <BR>
|
| Checks if a List/array is empty.</TD>
|
| </TR>
|
| <TR BGCOLOR="white" CLASS="TableRowColor">
|
| <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
|
| <CODE> boolean</CODE></FONT></TD>
|
| <TD><CODE><B><A HREF="../../../../../org/apache/velocity/tools/generic/ListTool.html#isList(java.lang.Object)">isList</A></B>(java.lang.Object object)</CODE>
|
|
|
| <BR>
|
| Checks if an object is a List.</TD>
|
| </TR>
|
| <TR BGCOLOR="white" CLASS="TableRowColor">
|
| <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
|
| <CODE> java.lang.Object</CODE></FONT></TD>
|
| <TD><CODE><B><A HREF="../../../../../org/apache/velocity/tools/generic/ListTool.html#set(java.lang.Object, int, java.lang.Object)">set</A></B>(java.lang.Object list, |
| int index, |
| java.lang.Object value)</CODE>
|
|
|
| <BR>
|
| Sets the specified element of a List/array.</TD>
|
| </TR>
|
| <TR BGCOLOR="white" CLASS="TableRowColor">
|
| <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
|
| <CODE>private java.lang.Object</CODE></FONT></TD>
|
| <TD><CODE><B><A HREF="../../../../../org/apache/velocity/tools/generic/ListTool.html#setToArray(java.lang.Object, int, java.lang.Object)">setToArray</A></B>(java.lang.Object array, |
| int index, |
| java.lang.Object value)</CODE>
|
|
|
| <BR>
|
| Sets the specified element of an array.</TD>
|
| </TR>
|
| <TR BGCOLOR="white" CLASS="TableRowColor">
|
| <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
|
| <CODE> java.lang.Integer</CODE></FONT></TD>
|
| <TD><CODE><B><A HREF="../../../../../org/apache/velocity/tools/generic/ListTool.html#size(java.lang.Object)">size</A></B>(java.lang.Object list)</CODE>
|
|
|
| <BR>
|
| Gets the size of a List/array.</TD>
|
| </TR>
|
| </TABLE>
|
| <A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A> |
| <TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
|
| <TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
|
| <TD><B>Methods inherited from class java.lang.Object</B></TD>
|
| </TR>
|
| <TR BGCOLOR="white" CLASS="TableRowColor">
|
| <TD><CODE>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</CODE></TD>
|
| </TR>
|
| </TABLE>
|
|
|
| <P>
|
|
|
| <!-- ============ FIELD DETAIL =========== -->
|
|
|
|
|
| <!-- ========= CONSTRUCTOR DETAIL ======== -->
|
|
|
| <A NAME="constructor_detail"><!-- --></A> |
| <TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
|
| <TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
|
| <TD COLSPAN=1><FONT SIZE="+2">
|
| <B>Constructor Detail</B></FONT></TD>
|
| </TR>
|
| </TABLE>
|
|
|
| <A NAME="ListTool()"><!-- --></A><H3>
|
| ListTool</H3>
|
| <PRE>
|
| public <B>ListTool</B>()</PRE>
|
| <DL>
|
| <DD>Default constructor.
|
| <P>
|
| </DL>
|
|
|
| <!-- ============ METHOD DETAIL ========== -->
|
|
|
| <A NAME="method_detail"><!-- --></A> |
| <TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
|
| <TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
|
| <TD COLSPAN=1><FONT SIZE="+2">
|
| <B>Method Detail</B></FONT></TD>
|
| </TR>
|
| </TABLE>
|
|
|
| <A NAME="get(java.lang.Object, int)"><!-- --></A><H3>
|
| get</H3>
|
| <PRE>
|
| public java.lang.Object <B>get</B>(java.lang.Object list, |
| int index)</PRE>
|
| <DL>
|
| <DD>Gets the specified element of a List/array. |
| It will return null under the following conditions: |
| <ul> |
| <li><code>list</code> is null.</li> |
| <li><code>list</code> is not a List/array.</li> |
| <li><code>list</code> doesn't have an <code>index</code>th value.</li> |
| </ul>
|
| <P>
|
| <DD><DL>
|
| <DT><B>Parameters:</B><DD><CODE>list</CODE> - the List/array object.<DD><CODE>index</CODE> - the index of the List/array to get. |
| <DT><B>Returns:</B><DD>the specified element of the List/array.</DL>
|
| </DD>
|
| </DL>
|
| <HR>
|
|
|
| <A NAME="getFromArray(java.lang.Object, int)"><!-- --></A><H3>
|
| getFromArray</H3>
|
| <PRE>
|
| private java.lang.Object <B>getFromArray</B>(java.lang.Object array, |
| int index)</PRE>
|
| <DL>
|
| <DD>Gets the specified element of an array.
|
| <P>
|
| <DD><DL>
|
| <DT><B>Parameters:</B><DD><CODE>array</CODE> - the array object.<DD><CODE>index</CODE> - the index of the array to get. |
| <DT><B>Returns:</B><DD>the specified element of the array.</DL>
|
| </DD>
|
| </DL>
|
| <HR>
|
|
|
| <A NAME="set(java.lang.Object, int, java.lang.Object)"><!-- --></A><H3>
|
| set</H3>
|
| <PRE>
|
| public java.lang.Object <B>set</B>(java.lang.Object list, |
| int index, |
| java.lang.Object value)</PRE>
|
| <DL>
|
| <DD>Sets the specified element of a List/array. |
| It will return null under the following conditions: |
| <ul> |
| <li><code>list</code> is null.</li> |
| <li><code>list</code> is not a List/array.</li> |
| <li><code>list</code> doesn't have an <code>index</code>th value.</li> |
| </ul>
|
| <P>
|
| <DD><DL>
|
| <DT><B>Parameters:</B><DD><CODE>list</CODE> - the List/array object.<DD><CODE>index</CODE> - the index of the List/array to set.<DD><CODE>value</CODE> - the element to set. |
| <DT><B>Returns:</B><DD>blank if set, null if not set.</DL>
|
| </DD>
|
| </DL>
|
| <HR>
|
|
|
| <A NAME="setToArray(java.lang.Object, int, java.lang.Object)"><!-- --></A><H3>
|
| setToArray</H3>
|
| <PRE>
|
| private java.lang.Object <B>setToArray</B>(java.lang.Object array, |
| int index, |
| java.lang.Object value)</PRE>
|
| <DL>
|
| <DD>Sets the specified element of an array.
|
| <P>
|
| <DD><DL>
|
| <DT><B>Parameters:</B><DD><CODE>array</CODE> - the array object.<DD><CODE>index</CODE> - the index of the array to set.<DD><CODE>value</CODE> - the element to set. |
| <DT><B>Returns:</B><DD>blank if set, null if not set.</DL>
|
| </DD>
|
| </DL>
|
| <HR>
|
|
|
| <A NAME="size(java.lang.Object)"><!-- --></A><H3>
|
| size</H3>
|
| <PRE>
|
| public java.lang.Integer <B>size</B>(java.lang.Object list)</PRE>
|
| <DL>
|
| <DD>Gets the size of a List/array. |
| It will return null under the following conditions: |
| <ul> |
| <li><code>list</code> is null.</li> |
| <li><code>list</code> is not a List/array.</li> |
| </ul>
|
| <P>
|
| <DD><DL>
|
| <DT><B>Parameters:</B><DD><CODE>list</CODE> - the List object. |
| <DT><B>Returns:</B><DD>the size of the List.</DL>
|
| </DD>
|
| </DL>
|
| <HR>
|
|
|
| <A NAME="isArray(java.lang.Object)"><!-- --></A><H3>
|
| isArray</H3>
|
| <PRE>
|
| public boolean <B>isArray</B>(java.lang.Object object)</PRE>
|
| <DL>
|
| <DD>Checks if an object is an array.
|
| <P>
|
| <DD><DL>
|
| <DT><B>Parameters:</B><DD><CODE>object</CODE> - the object to check. |
| <DT><B>Returns:</B><DD><code>true</code> if the object is an array.</DL>
|
| </DD>
|
| </DL>
|
| <HR>
|
|
|
| <A NAME="isList(java.lang.Object)"><!-- --></A><H3>
|
| isList</H3>
|
| <PRE>
|
| public boolean <B>isList</B>(java.lang.Object object)</PRE>
|
| <DL>
|
| <DD>Checks if an object is a List.
|
| <P>
|
| <DD><DL>
|
| <DT><B>Parameters:</B><DD><CODE>object</CODE> - the object to check. |
| <DT><B>Returns:</B><DD><code>true</code> if the object is a List.</DL>
|
| </DD>
|
| </DL>
|
| <HR>
|
|
|
| <A NAME="isEmpty(java.lang.Object)"><!-- --></A><H3>
|
| isEmpty</H3>
|
| <PRE>
|
| public java.lang.Boolean <B>isEmpty</B>(java.lang.Object list)</PRE>
|
| <DL>
|
| <DD>Checks if a List/array is empty.
|
| <P>
|
| <DD><DL>
|
| <DT><B>Parameters:</B><DD><CODE>list</CODE> - the List/array to check. |
| <DT><B>Returns:</B><DD><code>true</code> if the List/array is empty.</DL>
|
| </DD>
|
| </DL>
|
| <HR>
|
|
|
| <A NAME="contains(java.lang.Object, java.lang.Object)"><!-- --></A><H3>
|
| contains</H3>
|
| <PRE>
|
| public java.lang.Boolean <B>contains</B>(java.lang.Object list, |
| java.lang.Object element)</PRE>
|
| <DL>
|
| <DD>Checks if a List/array contains a certain element.
|
| <P>
|
| <DD><DL>
|
| <DT><B>Parameters:</B><DD><CODE>list</CODE> - the List/array to check.<DD><CODE>element</CODE> - the element to check. |
| <DT><B>Returns:</B><DD><code>true</code> if the List/array contains the element.</DL>
|
| </DD>
|
| </DL>
|
| <HR>
|
|
|
| <A NAME="arrayContains(java.lang.Object, java.lang.Object)"><!-- --></A><H3>
|
| arrayContains</H3>
|
| <PRE>
|
| private java.lang.Boolean <B>arrayContains</B>(java.lang.Object array, |
| java.lang.Object element)</PRE>
|
| <DL>
|
| <DD>Checks if an array contains a certain element.
|
| <P>
|
| <DD><DL>
|
| <DT><B>Parameters:</B><DD><CODE>array</CODE> - the array to check.<DD><CODE>element</CODE> - the element to check. |
| <DT><B>Returns:</B><DD><code>true</code> if the array contains the element.</DL>
|
| </DD>
|
| </DL>
|
| <HR>
|
|
|
| <A NAME="equals(java.lang.Object, java.lang.Object)"><!-- --></A><H3>
|
| equals</H3>
|
| <PRE>
|
| private boolean <B>equals</B>(java.lang.Object what, |
| java.lang.Object with)</PRE>
|
| <DL>
|
| <DD>Check if two objects are equal.
|
| <P>
|
| <DD><DL>
|
| <DT><B>Parameters:</B><DD><CODE>what</CODE> - an object<DD><CODE>with</CODE> - another object. |
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