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| <h2 title="Interface JspApplicationContext" class="title">Interface JspApplicationContext</h2> |
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| <pre>public interface <span class="typeNameLabel">JspApplicationContext</span></pre> |
| <div class="block">Stores application-scoped information relevant to JSP containers. |
| |
| <p> |
| The JSP container must create a single instance of <code>JspApplicationContext</code> for each |
| <code>ServletContext</code> instance. |
| </p> |
| |
| <p> |
| An instance of <code>JspApplicationContext</code> is obtained by invoking the static |
| <a href="../../../jakarta/servlet/jsp/JspFactory.html#getJspApplicationContext-jakarta.servlet.ServletContext-"><code>JspFactory.getJspApplicationContext(jakarta.servlet.ServletContext)</code></a> method, passing the <code>ServletContext</code> of the corresponding web |
| application. |
| </p> |
| |
| <p> |
| The <code>JspApplicationContext</code> provides the following services to JSP applications: |
| </p> |
| <ul> |
| <li>Allows registration of <code>ELResolver</code>s, which are used to resolve variables in EL expressions contained |
| in JSP pages and tag files.</li> |
| <li>Provides an instance of <code>ExpressionFactory</code> for those applications or frameworks that need to perform |
| programmatic evaluation of EL expressions instead of allowing the JSP container to do it for them.</li> |
| <li>Allows the attachment of <code>ELContextListener</code> instances for notification whenever a new |
| <code>ELContext</code> is created. This is necessary when an application wishes to make custom context objects |
| available to their pluggable <code>ELResolver</code>s.</li> |
| </ul></div> |
| <dl> |
| <dt><span class="simpleTagLabel">Since:</span></dt> |
| <dd>JSP 2.1</dd> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../jakarta/servlet/ServletContext.html" title="interface in jakarta.servlet"><code>ServletContext</code></a>, |
| <a href="../../../jakarta/servlet/jsp/JspFactory.html" title="class in jakarta.servlet.jsp"><code>JspFactory</code></a>, |
| <code>jakarta.el.ELResolver</code>, |
| <code>jakarta.el.ExpressionFactory</code>, |
| <code>jakarta.el.ELContextListener</code></dd> |
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| <h3>Method Summary</h3> |
| <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation"> |
| <caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd"> </span></span><span id="t3" class="tableTab"><span><a href="javascript:show(4);">Abstract Methods</a></span><span class="tabEnd"> </span></span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Method and Description</th> |
| </tr> |
| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../jakarta/servlet/jsp/JspApplicationContext.html#addELContextListener-ELContextListener-">addELContextListener</a></span>(ELContextListener listener)</code> |
| <div class="block">Registers a <code>ELContextListener</code>s so that context objects can be added whenever a new |
| <code>ELContext</code> is created.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../jakarta/servlet/jsp/JspApplicationContext.html#addELResolver-ELResolver-">addELResolver</a></span>(ELResolver resolver)</code> |
| <div class="block">Adds an <code>ELResolver</code> to affect the way EL variables and properties are resolved for EL expressions |
| appearing in JSP pages and tag files.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>ExpressionFactory</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../jakarta/servlet/jsp/JspApplicationContext.html#getExpressionFactory--">getExpressionFactory</a></span>()</code> |
| <div class="block">Returns a factory used to create <code>ValueExpression</code>s and <code>MethodExpression</code>s so that EL |
| expressions can be parsed and evaluated.</div> |
| </td> |
| </tr> |
| </table> |
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| <a name="addELResolver-ELResolver-"> |
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| <h4>addELResolver</h4> |
| <pre>void addELResolver(ELResolver resolver)</pre> |
| <div class="block">Adds an <code>ELResolver</code> to affect the way EL variables and properties are resolved for EL expressions |
| appearing in JSP pages and tag files. |
| |
| <p> |
| For example, in the EL expression ${employee.lastName}, an <code>ELResolver</code> determines what object |
| "employee" references and how to find its "lastName" property. |
| </p> |
| |
| <p> |
| When evaluating an expression, the JSP container will consult a set of standard resolvers as well as any |
| resolvers registered via this method. The set of resolvers are consulted in the following order: |
| </p> |
| <ul> |
| <li><a href="../../../jakarta/servlet/jsp/el/ImplicitObjectELResolver.html" title="class in jakarta.servlet.jsp.el"><code>ImplicitObjectELResolver</code></a></li> |
| <li><code>ELResolver</code>s registered via this method, in the order in which they are registered.</li> |
| <li><code>jakarta.el.MapELResolver</code></li> |
| <li><code>jakarta.el.ListELResolver</code></li> |
| <li><code>jakarta.el.ArrayELResolver</code></li> |
| <li><code>jakarta.el.BeanELResolver</code></li> |
| <li><a href="../../../jakarta/servlet/jsp/el/ScopedAttributeELResolver.html" title="class in jakarta.servlet.jsp.el"><code>ScopedAttributeELResolver</code></a></li> |
| </ul> |
| |
| <p> |
| It is illegal to register an <code>ELResolver</code> after the application has received any request from the |
| client. If an attempt is made to register an <code>ELResolver</code> after that time, an |
| <code>IllegalStateException</code> is thrown. |
| </p> |
| <p> |
| This restriction is in place to allow the JSP container to optimize for the common case where no additional |
| <code>ELResolver</code>s are in the chain, aside from the standard ones. It is permissible to add |
| <code>ELResolver</code>s before or after initialization to a <code>CompositeELResolver</code> that is already in |
| the chain. |
| </p> |
| |
| <p> |
| It is not possible to remove an <code>ELResolver</code> registered with this method, once it has been registered. |
| </p></div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>resolver</code> - The new <code>ELResolver</code></dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code>java.lang.IllegalStateException</code> - if an attempt is made to call this method after all |
| <code>ServletContextListener</code>s have had their <code>contextInitialized</code> |
| methods invoked.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getExpressionFactory--"> |
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| <h4>getExpressionFactory</h4> |
| <pre>ExpressionFactory getExpressionFactory()</pre> |
| <div class="block">Returns a factory used to create <code>ValueExpression</code>s and <code>MethodExpression</code>s so that EL |
| expressions can be parsed and evaluated.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>A concrete implementation of the an <code>ExpressionFactory</code>.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="addELContextListener-ELContextListener-"> |
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| <h4>addELContextListener</h4> |
| <pre>void addELContextListener(ELContextListener listener)</pre> |
| <div class="block">Registers a <code>ELContextListener</code>s so that context objects can be added whenever a new |
| <code>ELContext</code> is created. |
| |
| <p> |
| At a minimum, the <code>ELContext</code> objects created will contain a reference to the <code>JspContext</code> |
| for this request, which is added by the JSP container. This is sufficient for all the default |
| <code>ELResolver</code>s listed in <a href="../../../jakarta/servlet/jsp/JspApplicationContext.html#addELResolver-ELResolver-"><code>addELResolver(ELResolver)</code></a>. Note that <code>JspContext.class</code> is used as the |
| key to ELContext.putContext() for the <code>JspContext</code> object reference. |
| </p> |
| |
| <p> |
| This method is generally used by frameworks and applications that register their own <code>ELResolver</code> that |
| needs context other than <code>JspContext</code>. The listener will typically add the necessary context to the |
| <code>ELContext</code> provided in the event object. Registering a listener that adds context allows the |
| <code>ELResolver</code>s in the stack to access the context they need when they do a resolution. |
| </p></div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>listener</code> - The listener to be notified when a new <code>ELContext</code> is created.</dd> |
| </dl> |
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