compositeelresolver.html
来自「j2ee帮助文档软件设计/软件工程 文件格式」· HTML 代码 · 共 701 行 · 第 1/3 页
HTML
701 行
<!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 05:47:05 PST 2008 --><TITLE>CompositeELResolver (Java EE 5)</TITLE><META NAME="keywords" CONTENT="javax.el.CompositeELResolver class"><LINK REL ="stylesheet" TYPE="text/css" HREF="../../stylesheet.css" TITLE="Style"><SCRIPT type="text/javascript">function windowTitle(){ parent.document.title="CompositeELResolver (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/el/BeanELResolver.BeanProperty.html" title="class in javax.el"><B>PREV CLASS</B></A> <A HREF="../../javax/el/ELContext.html" title="class in javax.el"><B>NEXT CLASS</B></A></FONT></TD><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../index.html?javax/el/CompositeELResolver.html" target="_top"><B>FRAMES</B></A> <A HREF="CompositeELResolver.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 | <A HREF="#fields_inherited_from_class_javax.el.ELResolver">FIELD</A> | <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.el</FONT><BR>Class CompositeELResolver</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 "><A HREF="../../javax/el/ELResolver.html" title="class in javax.el">javax.el.ELResolver</A> <IMG SRC="../../resources/inherit.gif" ALT="extended by "><B>javax.el.CompositeELResolver</B></PRE><HR><DL><DT><PRE>public class <B>CompositeELResolver</B><DT>extends <A HREF="../../javax/el/ELResolver.html" title="class in javax.el">ELResolver</A></DL></PRE><P>Maintains an ordered composite list of child <code>ELResolver</code>s. <p>Though only a single <code>ELResolver</code> is associated with an <code>ELContext</code>, there are usually multiple resolvers considered for any given variable or property resolution. <code>ELResolver</code>s are combined together using a <code>CompositeELResolver</code>, to define rich semantics for evaluating an expression.</p> <p>For the <A HREF="../../javax/el/CompositeELResolver.html#getValue(javax.el.ELContext, java.lang.Object, java.lang.Object)"><CODE>getValue(javax.el.ELContext, java.lang.Object, java.lang.Object)</CODE></A>, <A HREF="../../javax/el/CompositeELResolver.html#getType(javax.el.ELContext, java.lang.Object, java.lang.Object)"><CODE>getType(javax.el.ELContext, java.lang.Object, java.lang.Object)</CODE></A>, <A HREF="../../javax/el/CompositeELResolver.html#setValue(javax.el.ELContext, java.lang.Object, java.lang.Object, java.lang.Object)"><CODE>setValue(javax.el.ELContext, java.lang.Object, java.lang.Object, java.lang.Object)</CODE></A> and <A HREF="../../javax/el/CompositeELResolver.html#isReadOnly(javax.el.ELContext, java.lang.Object, java.lang.Object)"><CODE>isReadOnly(javax.el.ELContext, java.lang.Object, java.lang.Object)</CODE></A> methods, an <code>ELResolver</code> is not responsible for resolving all possible (base, property) pairs. In fact, most resolvers will only handle a <code>base</code> of a single type. To indicate that a resolver has successfully resolved a particular (base, property) pair, it must set the <code>propertyResolved</code> property of the <code>ELContext</code> to <code>true</code>. If it could not handle the given pair, it must leave this property alone. The caller must ignore the return value of the method if <code>propertyResolved</code> is <code>false</code>.</p> <p>The <code>CompositeELResolver</code> initializes the <code>ELContext.propertyResolved</code> flag to <code>false</code>, and uses it as a stop condition for iterating through its component resolvers.</p> <p>The <code>ELContext.propertyResolved</code> flag is not used for the design-time methods <A HREF="../../javax/el/CompositeELResolver.html#getFeatureDescriptors(javax.el.ELContext, java.lang.Object)"><CODE>getFeatureDescriptors(javax.el.ELContext, java.lang.Object)</CODE></A> and <A HREF="../../javax/el/CompositeELResolver.html#getCommonPropertyType(javax.el.ELContext, java.lang.Object)"><CODE>getCommonPropertyType(javax.el.ELContext, java.lang.Object)</CODE></A>. Instead, results are collected and combined from all child <code>ELResolver</code>s for these methods.</p><P><P><DL><DT><B>Since:</B></DT> <DD>JSP 2.1</DD><DT><B>See Also:</B><DD><A HREF="../../javax/el/ELContext.html" title="class in javax.el"><CODE>ELContext</CODE></A>, <A HREF="../../javax/el/ELResolver.html" title="class in javax.el"><CODE>ELResolver</CODE></A></DL><HR><P><!-- =========== FIELD SUMMARY =========== --><A NAME="field_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>Field Summary</B></FONT></TH></TR></TABLE> <A NAME="fields_inherited_from_class_javax.el.ELResolver"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TH ALIGN="left"><B>Fields inherited from class javax.el.<A HREF="../../javax/el/ELResolver.html" title="class in javax.el">ELResolver</A></B></TH></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><A HREF="../../javax/el/ELResolver.html#RESOLVABLE_AT_DESIGN_TIME">RESOLVABLE_AT_DESIGN_TIME</A>, <A HREF="../../javax/el/ELResolver.html#TYPE">TYPE</A></CODE></TD></TR></TABLE> <!-- ======== 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/el/CompositeELResolver.html#CompositeELResolver()">CompositeELResolver</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/el/CompositeELResolver.html#add(javax.el.ELResolver)">add</A></B>(<A HREF="../../javax/el/ELResolver.html" title="class in javax.el">ELResolver</A> elResolver)</CODE><BR> Adds the given resolver to the list of component resolvers.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="http://java.sun.com/j2se/1.5/docs/api/java/lang/Class.html" title="class or interface in java.lang">Class</A><?></CODE></FONT></TD><TD><CODE><B><A HREF="../../javax/el/CompositeELResolver.html#getCommonPropertyType(javax.el.ELContext, java.lang.Object)">getCommonPropertyType</A></B>(<A HREF="../../javax/el/ELContext.html" title="class in javax.el">ELContext</A> context, <A HREF="http://java.sun.com/j2se/1.5/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A> base)</CODE><BR> Returns the most general type that this resolver accepts for the <code>property</code> argument, given a <code>base</code> object.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="http://java.sun.com/j2se/1.5/docs/api/java/util/Iterator.html" title="class or interface in java.util">Iterator</A><<A HREF="http://java.sun.com/j2se/1.5/docs/api/java/beans/FeatureDescriptor.html" title="class or interface in java.beans">FeatureDescriptor</A>></CODE></FONT></TD><TD><CODE><B><A HREF="../../javax/el/CompositeELResolver.html#getFeatureDescriptors(javax.el.ELContext, java.lang.Object)">getFeatureDescriptors</A></B>(<A HREF="../../javax/el/ELContext.html" title="class in javax.el">ELContext</A> context, <A HREF="http://java.sun.com/j2se/1.5/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A> base)</CODE><BR> Returns information about the set of variables or properties that can be resolved for the given <code>base</code> object.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="http://java.sun.com/j2se/1.5/docs/api/java/lang/Class.html" title="class or interface in java.lang">Class</A><?></CODE></FONT></TD><TD><CODE><B><A HREF="../../javax/el/CompositeELResolver.html#getType(javax.el.ELContext, java.lang.Object, java.lang.Object)">getType</A></B>(<A HREF="../../javax/el/ELContext.html" title="class in javax.el">ELContext</A> context, <A HREF="http://java.sun.com/j2se/1.5/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A> base, <A HREF="http://java.sun.com/j2se/1.5/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A> property)</CODE><BR> For a given <code>base</code> and <code>property</code>, attempts to identify the most general type that is acceptable for an object to be passed as the <code>value</code> parameter in a future call to the <A HREF="../../javax/el/CompositeELResolver.html#setValue(javax.el.ELContext, java.lang.Object, java.lang.Object, java.lang.Object)"><CODE>setValue(javax.el.ELContext, java.lang.Object, java.lang.Object, java.lang.Object)</CODE></A> method.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <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/el/CompositeELResolver.html#getValue(javax.el.ELContext, java.lang.Object, java.lang.Object)">getValue</A></B>(<A HREF="../../javax/el/ELContext.html" title="class in javax.el">ELContext</A> context, <A HREF="http://java.sun.com/j2se/1.5/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A> base, <A HREF="http://java.sun.com/j2se/1.5/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A> property)</CODE><BR> Attempts to resolve the given <code>property</code> object on the given <code>base</code> object by querying all component resolvers.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor">⌨️ 快捷键说明
复制代码Ctrl + C
搜索代码Ctrl + F
全屏模式F11
增大字号Ctrl + =
减小字号Ctrl + -
显示快捷键?