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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Frameset//EN""http://www.w3.org/TR/REC-html40/frameset.dtd"><!--NewPage--><HTML><HEAD><!-- Generated by javadoc on Fri Dec 06 19:57:10 CET 2002 --><TITLE>jakarta-turbine-2 2.2 API: Class ObjectUtils</TITLE><LINK REL ="stylesheet" TYPE="text/css" HREF="../../../../stylesheet.css" TITLE="Style"></HEAD><BODY BGCOLOR="white"><!-- ========== START OF NAVBAR ========== --><A NAME="navbar_top"><!-- --></A><TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0"><TR><TD COLSPAN=2 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"><A NAME="navbar_top_firstrow"><!-- --></A><TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3"> <TR ALIGN="center" VALIGN="top"> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../overview-summary.html"><FONT CLASS="NavBarFont1"><B>Overview</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-summary.html"><FONT CLASS="NavBarFont1"><B>Package</B></FONT></A> </TD> <TD BGCOLOR="#FFFFFF" 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manipulation routines should go.<P><DL><DT><B>Version: </B><DD>$Id: ObjectUtils.java,v 1.2 2002/07/11 16:53:21 mpoeschl Exp $</DD><DT><B>Author: </B><DD><a href="mailto:nissim@nksystems.com">Nissim Karpenstein</a></DD></DL><HR><P><!-- ======== INNER CLASS SUMMARY ======== --><!-- =========== FIELD SUMMARY =========== --><!-- ======== CONSTRUCTOR SUMMARY ======== --><A NAME="constructor_summary"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><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/turbine/util/ObjectUtils.html#ObjectUtils()">ObjectUtils</A></B>()</CODE><BR> </TD></TR></TABLE> <!-- ========== METHOD SUMMARY =========== --><A NAME="method_summary"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><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>static void</CODE></FONT></TD><TD><CODE><B><A HREF="../../../../org/apache/turbine/util/ObjectUtils.html#addOnce(java.util.Vector, java.lang.Object)">addOnce</A></B>(java.util.Vector v, java.lang.Object o)</CODE><BR> Adds an object to a vector, making sure the object is in the vector only once.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static java.lang.Object</CODE></FONT></TD><TD><CODE><B><A HREF="../../../../org/apache/turbine/util/ObjectUtils.html#deserialize(byte[])">deserialize</A></B>(byte[] objectData)</CODE><BR> Deserializes a single object from an array of bytes.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static boolean</CODE></FONT></TD><TD><CODE><B><A HREF="../../../../org/apache/turbine/util/ObjectUtils.html#equals(java.lang.Object, java.lang.Object)">equals</A></B>(java.lang.Object o1, java.lang.Object o2)</CODE><BR> Compares two Objects, returns true if their values are the same.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static java.lang.Object</CODE></FONT></TD><TD><CODE><B><A HREF="../../../../org/apache/turbine/util/ObjectUtils.html#isNull(java.lang.Object, java.lang.Object)">isNull</A></B>(java.lang.Object o, java.lang.Object dflt)</CODE><BR> Returns a default value if the object passed is null.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static void</CODE></FONT></TD><TD><CODE><B><A HREF="../../../../org/apache/turbine/util/ObjectUtils.html#safeAddToHashtable(java.util.Hashtable, java.lang.Object, java.lang.Object)">safeAddToHashtable</A></B>(java.util.Hashtable hash, java.lang.Object key, java.lang.Object value)</CODE><BR> Nice method for adding data to a Hashtable in such a way as to not get NPE's.</TD></TR></TABLE> <A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><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" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=1><FONT SIZE="+2"><B>Constructor Detail</B></FONT></TD></TR></TABLE><A NAME="ObjectUtils()"><!-- --></A><H3>ObjectUtils</H3><PRE>public <B>ObjectUtils</B>()</PRE><DL></DL><!-- ============ METHOD DETAIL ========== --><A NAME="method_detail"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=1><FONT SIZE="+2"><B>Method Detail</B></FONT></TD></TR></TABLE><A NAME="isNull(java.lang.Object, java.lang.Object)"><!-- --></A><H3>isNull</H3><PRE>public static java.lang.Object <B>isNull</B>(java.lang.Object o, java.lang.Object dflt)</PRE><DL><DD>Returns a default value if the object passed is null.<DD><DL><DT><B>Parameters:</B><DD><CODE>o</CODE> - The object to test.<DD><CODE>dflt</CODE> - The default value to return.<DT><B>Returns:</B><DD>The object o if it is not null, dflt otherwise.</DL></DD></DL><HR><A NAME="addOnce(java.util.Vector, java.lang.Object)"><!-- --></A><H3>addOnce</H3><PRE>public static void <B>addOnce</B>(java.util.Vector v, java.lang.Object o)</PRE><DL><DD>Adds an object to a vector, making sure the object is in the vector only once.<DD><DL><DT><B>Parameters:</B><DD><CODE>v</CODE> - The vector.<DD><CODE>o</CODE> - The object.</DL></DD></DL><HR><A NAME="deserialize(byte[])"><!-- --></A><H3>deserialize</H3><PRE>public static java.lang.Object <B>deserialize</B>(byte[] objectData)</PRE><DL><DD>Deserializes a single object from an array of bytes.<DD><DL><DT><B>Parameters:</B><DD><CODE>objectData</CODE> - The serialized object.<DT><B>Returns:</B><DD>The deserialized object, or <code>null</code> on failure.</DL></DD></DL><HR><A NAME="equals(java.lang.Object, java.lang.Object)"><!-- --></A><H3>equals</H3><PRE>public static boolean <B>equals</B>(java.lang.Object o1, java.lang.Object o2)</PRE><DL><DD>Compares two Objects, returns true if their values are the same. It checks for null values prior to an o1.equals(o2) check<DD><DL><DT><B>Parameters:</B><DD><CODE>o1</CODE> - The first object.<DD><CODE>o2</CODE> - The second object.<DT><B>Returns:</B><DD>True if the values of both xstrings are the same.</DL></DD></DL><HR><A NAME="safeAddToHashtable(java.util.Hashtable, java.lang.Object, java.lang.Object)"><!-- --></A><H3>safeAddToHashtable</H3><PRE>public static final void <B>safeAddToHashtable</B>(java.util.Hashtable hash, java.lang.Object key, java.lang.Object value) throws java.lang.NullPointerException</PRE><DL><DD>Nice method for adding data to a Hashtable in such a way as to not get NPE's. The point being that if the value is null, Hashtable.put() will throw an exception. That blows in the case of this class cause you may want to essentially treat put("Not Null", null ) == put("Not Null", "") We will still throw a NPE if the key is null cause that should never happen.</DL><!-- ========= END OF CLASS DATA ========= --><HR><!-- ========== START OF NAVBAR ========== --><A NAME="navbar_bottom"><!-- --></A><TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0"><TR><TD COLSPAN=2 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"><A NAME="navbar_bottom_firstrow"><!-- --></A><TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3"> <TR ALIGN="center" VALIGN="top"> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../overview-summary.html"><FONT CLASS="NavBarFont1"><B>Overview</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-summary.html"><FONT CLASS="NavBarFont1"><B>Package</B></FONT></A> </TD> <TD BGCOLOR="#FFFFFF" CLASS="NavBarCell1Rev"> <FONT CLASS="NavBarFont1Rev"><B>Class</B></FONT> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="class-use/ObjectUtils.html"><FONT CLASS="NavBarFont1"><B>Use</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-tree.html"><FONT CLASS="NavBarFont1"><B>Tree</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../deprecated-list.html"><FONT CLASS="NavBarFont1"><B>Deprecated</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../index-all.html"><FONT CLASS="NavBarFont1"><B>Index</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../help-doc.html"><FONT CLASS="NavBarFont1"><B>Help</B></FONT></A> </TD> </TR></TABLE></TD><TD ALIGN="right" VALIGN="top" ROWSPAN=3><EM></EM></TD></TR><TR><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../../org/apache/turbine/util/Log.html"><B>PREV CLASS</B></A> <A HREF="../../../../org/apache/turbine/util/QuickSort.html"><B>NEXT CLASS</B></A></FONT></TD><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../../index.html" TARGET="_top"><B>FRAMES</B></A> <A HREF="ObjectUtils.html" TARGET="_top"><B>NO FRAMES</B></A></FONT></TD></TR><TR><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> SUMMARY: INNER | FIELD | <A HREF="#constructor_summary">CONSTR</A> | <A HREF="#method_summary">METHOD</A></FONT></TD><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">DETAIL: FIELD | <A HREF="#constructor_detail">CONSTR</A> | <A HREF="#method_detail">METHOD</A></FONT></TD></TR></TABLE><!-- =========== END OF NAVBAR =========== --><HR>Copyright © 2000-2002 Apache Software Foundation. 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