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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><!--NewPage--><HTML><HEAD><!-- Generated by javadoc (build 1.5.0_14) on Mon Jan 28 05:46:53 PST 2008 --><TITLE>DataModel (Java EE 5)</TITLE><META NAME="keywords" CONTENT="javax.faces.model.DataModel class"><LINK REL ="stylesheet" TYPE="text/css" HREF="../../../stylesheet.css" TITLE="Style"><SCRIPT type="text/javascript">function windowTitle(){ parent.document.title="DataModel (Java EE 5)";}</SCRIPT><NOSCRIPT></NOSCRIPT></HEAD><BODY BGCOLOR="white" onload="windowTitle();"><!-- ========= START OF TOP NAVBAR ======= --><A NAME="navbar_top"><!-- --></A><A HREF="#skip-navbar_top" title="Skip navigation links"></A><TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0" SUMMARY=""><TR><TD COLSPAN=2 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"><A NAME="navbar_top_firstrow"><!-- --></A><TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3" SUMMARY=""> <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="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="../../../javax/faces/model/ArrayDataModel.html" title="class in javax.faces.model"><B>PREV CLASS</B></A> <A HREF="../../../javax/faces/model/DataModelEvent.html" title="class in javax.faces.model"><B>NEXT CLASS</B></A></FONT></TD><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../index.html?javax/faces/model/DataModel.html" target="_top"><B>FRAMES</B></A> <A HREF="DataModel.html" target="_top"><B>NO FRAMES</B></A> <SCRIPT type="text/javascript"> <!-- if(window==top) { document.writeln('<A HREF="../../../allclasses-noframe.html"><B>All Classes</B></A>'); } //--></SCRIPT><NOSCRIPT> <A HREF="../../../allclasses-noframe.html"><B>All Classes</B></A></NOSCRIPT></FONT></TD></TR><TR><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> SUMMARY: NESTED | 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><A NAME="skip-navbar_top"></A><!-- ========= END OF TOP NAVBAR ========= --><HR><!-- ======== START OF CLASS DATA ======== --><H2><FONT SIZE="-1">javax.faces.model</FONT><BR>Class DataModel</H2><PRE><A HREF="http://java.sun.com/j2se/1.5/docs/api/java/lang/Object.html" title="class or interface in java.lang">java.lang.Object</A> <IMG SRC="../../../resources/inherit.gif" ALT="extended by "><B>javax.faces.model.DataModel</B></PRE><DL><DT><B>Direct Known Subclasses:</B> <DD><A HREF="../../../javax/faces/model/ArrayDataModel.html" title="class in javax.faces.model">ArrayDataModel</A>, <A HREF="../../../javax/faces/model/ListDataModel.html" title="class in javax.faces.model">ListDataModel</A>, <A HREF="../../../javax/faces/model/ResultDataModel.html" title="class in javax.faces.model">ResultDataModel</A>, <A HREF="../../../javax/faces/model/ResultSetDataModel.html" title="class in javax.faces.model">ResultSetDataModel</A>, <A HREF="../../../javax/faces/model/ScalarDataModel.html" title="class in javax.faces.model">ScalarDataModel</A></DD></DL><HR><DL><DT><PRE>public abstract class <B>DataModel</B><DT>extends <A HREF="http://java.sun.com/j2se/1.5/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A></DL></PRE><P><p><strong>DataModel</strong> is an abstraction around arbitrary data binding technologies that can be used to adapt a variety of data sources for use by JavaServer Faces components that support per-row processing for their child components (such as <A HREF="../../../javax/faces/component/UIData.html" title="class in javax.faces.component"><CODE>UIData</CODE></A>.</p> <p>The data collection underlying a <A HREF="../../../javax/faces/model/DataModel.html" title="class in javax.faces.model"><CODE>DataModel</CODE></A> instance is modeled as a collection of row objects that can be accessed by a zero-relative cursor (row index). The APIs provide mechanisms to position to a specified zero-relative row index, and to retrieve an object that represents the data that corresponds to the current row index.</p> <p>A concrete <A HREF="../../../javax/faces/model/DataModel.html" title="class in javax.faces.model"><CODE>DataModel</CODE></A> instance is attached to a particular collection of underlying data by calling the <code>setWrappedData()</code> method. It can be detached from that underlying data collection by passing a <code>null</code> parameter to this method.</p> <p>Concrete <A HREF="../../../javax/faces/model/DataModel.html" title="class in javax.faces.model"><CODE>DataModel</CODE></A> implementations must provide a public zero-arguments constructor that calls <code>setWrappedData(null)</code>. A convenience constructor that takes a wrapped object of the appropriate type (and passes it on via a call to <code>setWrappedData()</code>, should also be provided.</p> <p>Event listeners may be registered to receive notifications of when a new row index is selected.</p><P><P><HR><P><!-- ======== CONSTRUCTOR SUMMARY ======== --><A NAME="constructor_summary"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"><B>Constructor Summary</B></FONT></TH></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="../../../javax/faces/model/DataModel.html#DataModel()">DataModel</A></B>()</CODE><BR> </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"><TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"><B>Method Summary</B></FONT></TH></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> void</CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/faces/model/DataModel.html#addDataModelListener(javax.faces.model.DataModelListener)">addDataModelListener</A></B>(<A HREF="../../../javax/faces/model/DataModelListener.html" title="interface in javax.faces.model">DataModelListener</A> listener)</CODE><BR> Add a new <A HREF="../../../javax/faces/model/DataModelListener.html" title="interface in javax.faces.model"><CODE>DataModelListener</CODE></A> to the set interested in notifications from this <A HREF="../../../javax/faces/model/DataModel.html" title="class in javax.faces.model"><CODE>DataModel</CODE></A>.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../../javax/faces/model/DataModelListener.html" title="interface in javax.faces.model">DataModelListener</A>[]</CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/faces/model/DataModel.html#getDataModelListeners()">getDataModelListeners</A></B>()</CODE><BR> Return the set of <A HREF="../../../javax/faces/model/DataModelListener.html" title="interface in javax.faces.model"><CODE>DataModelListener</CODE></A>s interested in notifications from this <A HREF="../../../javax/faces/model/DataModel.html" title="class in javax.faces.model"><CODE>DataModel</CODE></A>.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>abstract int</CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/faces/model/DataModel.html#getRowCount()">getRowCount</A></B>()</CODE><BR> Return the number of rows of data objects represented by this <A HREF="../../../javax/faces/model/DataModel.html" title="class in javax.faces.model"><CODE>DataModel</CODE></A>.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>abstract <A HREF="http://java.sun.com/j2se/1.5/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/faces/model/DataModel.html#getRowData()">getRowData</A></B>()</CODE><BR> Return an object representing the data for the currenty selected row index.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>abstract int</CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/faces/model/DataModel.html#getRowIndex()">getRowIndex</A></B>()</CODE><BR> Return the zero-relative index of the currently selected row.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>abstract <A HREF="http://java.sun.com/j2se/1.5/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/faces/model/DataModel.html#getWrappedData()">getWrappedData</A></B>()</CODE><BR> Return the object representing the data wrapped by this <A HREF="../../../javax/faces/model/DataModel.html" title="class in javax.faces.model"><CODE>DataModel</CODE></A>, if any.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>abstract boolean</CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/faces/model/DataModel.html#isRowAvailable()">isRowAvailable</A></B>()</CODE><BR> Return a flag indicating whether there is <code>rowData</code> available at the current <code>rowIndex</code>.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> void</CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/faces/model/DataModel.html#removeDataModelListener(javax.faces.model.DataModelListener)">removeDataModelListener</A></B>(<A HREF="../../../javax/faces/model/DataModelListener.html" title="interface in javax.faces.model">DataModelListener</A> listener)</CODE><BR> Remove an existing <A HREF="../../../javax/faces/model/DataModelListener.html" title="interface in javax.faces.model"><CODE>DataModelListener</CODE></A> from the set interested in notifications from this <A HREF="../../../javax/faces/model/DataModel.html" title="class in javax.faces.model"><CODE>DataModel</CODE></A>.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>abstract void</CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/faces/model/DataModel.html#setRowIndex(int)">setRowIndex</A></B>(int rowIndex)</CODE><BR> Set the zero-relative index of the currently selected row, or -1 to indicate that we are not positioned on a row.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>abstract void</CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/faces/model/DataModel.html#setWrappedData(java.lang.Object)">setWrappedData</A></B>(<A HREF="http://java.sun.com/j2se/1.5/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A> data)</CODE><BR> Set the object representing the data collection wrapped by this <A HREF="../../../javax/faces/model/DataModel.html" title="class in javax.faces.model"><CODE>DataModel</CODE></A>.</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"><TH ALIGN="left"><B>Methods inherited from class java.lang.<A HREF="http://java.sun.com/j2se/1.5/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A></B></TH></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><A HREF="http://java.sun.com/j2se/1.5/docs/api/java/lang/Object.html#clone()" title="class or interface in java.lang">clone</A>, <A HREF="http://java.sun.com/j2se/1.5/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/j2se/1.5/docs/api/java/lang/Object.html#finalize()" title="class or interface in java.lang">finalize</A>, <A HREF="http://java.sun.com/j2se/1.5/docs/api/java/lang/Object.html#getClass()" title="class or interface in java.lang">getClass</A>, <A HREF="http://java.sun.com/j2se/1.5/docs/api/java/lang/Object.html#hashCode()" title="class or interface in java.lang">hashCode</A>, <A HREF="http://java.sun.com/j2se/1.5/docs/api/java/lang/Object.html#notify()" title="class or interface in java.lang">notify</A>, <A HREF="http://java.sun.com/j2se/1.5/docs/api/java/lang/Object.html#notifyAll()" title="class or interface in java.lang">notifyAll</A>, <A HREF="http://java.sun.com/j2se/1.5/docs/api/java/lang/Object.html#toString()" title="class or interface in java.lang">toString</A>, <A HREF="http://java.sun.com/j2se/1.5/docs/api/java/lang/Object.html#wait()" title="class or interface in java.lang">wait</A>, <A HREF="http://java.sun.com/j2se/1.5/docs/api/java/lang/Object.html#wait(long)" title="class or interface in java.lang">wait</A>, <A HREF="http://java.sun.com/j2se/1.5/docs/api/java/lang/Object.html#wait(long, int)" title="class or interface in java.lang">wait</A></CODE></TD></TR></TABLE> <P><!-- ========= CONSTRUCTOR DETAIL ======== --><A NAME="constructor_detail"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2"><B>Constructor Detail</B></FONT></TH></TR></TABLE>⌨️ 快捷键说明
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