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<h2 title="Class ValueExpression" class="title">Class ValueExpression</h2>
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<li>java.lang.Object</li>
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<li><a href="../../javax/el/Expression.html" title="class in javax.el">javax.el.Expression</a></li>
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<pre>public abstract class <span class="typeNameLabel">ValueExpression</span>
extends <a href="../../javax/el/Expression.html" title="class in javax.el">Expression</a></pre>
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<th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="../../javax/el/ValueExpression.html#ValueExpression--">ValueExpression</a></span>()</code></th>
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<td class="colFirst"><code>abstract java.lang.Class<?></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="../../javax/el/ValueExpression.html#getExpectedType--">getExpectedType</a></span>()</code></th>
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<td class="colFirst"><code>abstract java.lang.Class<?></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="../../javax/el/ValueExpression.html#getType-javax.el.ELContext-">getType</a></span>​(<a href="../../javax/el/ELContext.html" title="class in javax.el">ELContext</a> context)</code></th>
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<td class="colFirst"><code>abstract java.lang.Object</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="../../javax/el/ValueExpression.html#getValue-javax.el.ELContext-">getValue</a></span>​(<a href="../../javax/el/ELContext.html" title="class in javax.el">ELContext</a> context)</code></th>
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<td class="colFirst"><code><a href="../../javax/el/ValueReference.html" title="class in javax.el">ValueReference</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="../../javax/el/ValueExpression.html#getValueReference-javax.el.ELContext-">getValueReference</a></span>​(<a href="../../javax/el/ELContext.html" title="class in javax.el">ELContext</a> context)</code></th>
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<td class="colFirst"><code>abstract boolean</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="../../javax/el/ValueExpression.html#isReadOnly-javax.el.ELContext-">isReadOnly</a></span>​(<a href="../../javax/el/ELContext.html" title="class in javax.el">ELContext</a> context)</code></th>
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<td class="colFirst"><code>abstract void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="../../javax/el/ValueExpression.html#setValue-javax.el.ELContext-java.lang.Object-">setValue</a></span>​(<a href="../../javax/el/ELContext.html" title="class in javax.el">ELContext</a> context,
java.lang.Object value)</code></th>
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<h3>Methods inherited from class javax.el.<a href="../../javax/el/Expression.html" title="class in javax.el">Expression</a></h3>
<code><a href="../../javax/el/Expression.html#equals-java.lang.Object-">equals</a>, <a href="../../javax/el/Expression.html#getExpressionString--">getExpressionString</a>, <a href="../../javax/el/Expression.html#hashCode--">hashCode</a>, <a href="../../javax/el/Expression.html#isLiteralText--">isLiteralText</a></code></li>
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<h4>ValueExpression</h4>
<pre>public ValueExpression()</pre>
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<h4>getValue</h4>
<pre>public abstract java.lang.Object getValue​(<a href="../../javax/el/ELContext.html" title="class in javax.el">ELContext</a> context)</pre>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>context</code> - The EL context for this evaluation</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The result of evaluating this value expression</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>java.lang.NullPointerException</code> - If the supplied context is <code>null</code></dd>
<dd><code><a href="../../javax/el/PropertyNotFoundException.html" title="class in javax.el">PropertyNotFoundException</a></code> - If a property/variable resolution failed because no match
was found or a match was found but was not readable</dd>
<dd><code><a href="../../javax/el/ELException.html" title="class in javax.el">ELException</a></code> - Wraps any exception throw whilst resolving a property or
variable</dd>
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<h4>setValue</h4>
<pre>public abstract void setValue​(<a href="../../javax/el/ELContext.html" title="class in javax.el">ELContext</a> context,
java.lang.Object value)</pre>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>context</code> - The EL context for this evaluation</dd>
<dd><code>value</code> - The value to set the property to which this value
expression refers</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>java.lang.NullPointerException</code> - If the supplied context is <code>null</code></dd>
<dd><code><a href="../../javax/el/PropertyNotFoundException.html" title="class in javax.el">PropertyNotFoundException</a></code> - If a property/variable resolution failed because no match
was found</dd>
<dd><code><a href="../../javax/el/PropertyNotWritableException.html" title="class in javax.el">PropertyNotWritableException</a></code> - If a property/variable resolution failed because a match was
found but was not writable</dd>
<dd><code><a href="../../javax/el/ELException.html" title="class in javax.el">ELException</a></code> - Wraps any exception throw whilst resolving a property or
variable</dd>
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<h4>isReadOnly</h4>
<pre>public abstract boolean isReadOnly​(<a href="../../javax/el/ELContext.html" title="class in javax.el">ELContext</a> context)</pre>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>context</code> - The EL context for this evaluation</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd><code>true</code> if this expression is read only otherwise
<code>false</code></dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>java.lang.NullPointerException</code> - If the supplied context is <code>null</code></dd>
<dd><code><a href="../../javax/el/PropertyNotFoundException.html" title="class in javax.el">PropertyNotFoundException</a></code> - If a property/variable resolution failed because no match
was found or a match was found but was not readable</dd>
<dd><code><a href="../../javax/el/ELException.html" title="class in javax.el">ELException</a></code> - Wraps any exception throw whilst resolving a property or
variable</dd>
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<h4>getType</h4>
<pre>public abstract java.lang.Class<?> getType​(<a href="../../javax/el/ELContext.html" title="class in javax.el">ELContext</a> context)</pre>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>context</code> - The EL context for this evaluation</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The type of the result of this value expression</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>java.lang.NullPointerException</code> - If the supplied context is <code>null</code></dd>
<dd><code><a href="../../javax/el/PropertyNotFoundException.html" title="class in javax.el">PropertyNotFoundException</a></code> - If a property/variable resolution failed because no match
was found or a match was found but was not readable</dd>
<dd><code><a href="../../javax/el/ELException.html" title="class in javax.el">ELException</a></code> - Wraps any exception throw whilst resolving a property or
variable</dd>
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<h4>getExpectedType</h4>
<pre>public abstract java.lang.Class<?> getExpectedType()</pre>
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<h4>getValueReference</h4>
<pre>public <a href="../../javax/el/ValueReference.html" title="class in javax.el">ValueReference</a> getValueReference​(<a href="../../javax/el/ELContext.html" title="class in javax.el">ELContext</a> context)</pre>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>context</code> - The EL context for this evaluation</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>This default implementation always returns <code>null</code></dd>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>EL 2.2</dd>
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