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<div class="subTitle"><span class="packageLabelInType">Package</span> <a href="../../../javax/servlet/jsp/package-summary.html">javax.servlet.jsp</a></div>
<h2 title="Class JspContext" class="title">Class JspContext</h2>
</div>
<div class="contentContainer">
<ul class="inheritance">
<li>java.lang.Object</li>
<li>
<ul class="inheritance">
<li>javax.servlet.jsp.JspContext</li>
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</li>
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<dd><code><a href="../../../javax/servlet/jsp/PageContext.html" title="class in javax.servlet.jsp">PageContext</a></code></dd>
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<hr>
<pre>public abstract class <span class="typeNameLabel">JspContext</span>
extends java.lang.Object</pre>
<div class="block"><p>
<code>JspContext</code> serves as the base class for the
PageContext class and abstracts all information that is not specific
to servlets. This allows for Simple Tag Extensions to be used
outside of the context of a request/response Servlet.
<p>
The JspContext provides a number of facilities to the
page/component author and page implementor, including:
<ul>
<li>a single API to manage the various scoped namespaces
<li>a mechanism to obtain the JspWriter for output
<li>a mechanism to expose page directive attributes to the
scripting environment
</ul>
<p><B>Methods Intended for Container Generated Code</B>
<p>
The following methods enable the <B>management of nested</B> JspWriter
streams to implement Tag Extensions: <code>pushBody()</code> and
<code>popBody()</code>
<p><B>Methods Intended for JSP authors</B>
<p>
Some methods provide <B>uniform access</B> to the diverse objects
representing scopes.
The implementation must use the underlying machinery
corresponding to that scope, so information can be passed back and
forth between the underlying environment (e.g. Servlets) and JSP pages.
The methods are:
<code>setAttribute()</code>, <code>getAttribute()</code>,
<code>findAttribute()</code>, <code>removeAttribute()</code>,
<code>getAttributesScope()</code> and
<code>getAttributeNamesInScope()</code>.
<p>
The following methods provide <B>convenient access</B> to implicit objects:
<code>getOut()</code>
<p>
The following methods provide <B>programmatic access</b> to the
Expression Language evaluator:
<code>getExpressionEvaluator()</code>, <code>getVariableResolver()</code></div>
<dl>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>2.0</dd>
</dl>
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<th class="colFirst" scope="col">Constructor</th>
<th class="colLast" scope="col">Description</th>
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<th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="../../../javax/servlet/jsp/JspContext.html#JspContext--">JspContext</a></span>()</code></th>
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<div class="block">Sole constructor.</div>
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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/servlet/jsp/JspContext.html#findAttribute-java.lang.String-">findAttribute</a></span>​(java.lang.String name)</code></th>
<td class="colLast">
<div class="block">Searches for the named attribute in page, request, session (if valid),
and application scope(s) in order and returns the value associated or
null.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>abstract java.lang.Object</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="../../../javax/servlet/jsp/JspContext.html#getAttribute-java.lang.String-">getAttribute</a></span>​(java.lang.String name)</code></th>
<td class="colLast">
<div class="block">Returns the object associated with the name in the page scope or null
if not found.</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>abstract java.lang.Object</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="../../../javax/servlet/jsp/JspContext.html#getAttribute-java.lang.String-int-">getAttribute</a></span>​(java.lang.String name,
int scope)</code></th>
<td class="colLast">
<div class="block">Return the object associated with the name in the specified
scope or null if not found.</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>abstract java.util.Enumeration<java.lang.String></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="../../../javax/servlet/jsp/JspContext.html#getAttributeNamesInScope-int-">getAttributeNamesInScope</a></span>​(int scope)</code></th>
<td class="colLast">
<div class="block">Enumerate all the attributes in a given scope.</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>abstract int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="../../../javax/servlet/jsp/JspContext.html#getAttributesScope-java.lang.String-">getAttributesScope</a></span>​(java.lang.String name)</code></th>
<td class="colLast">
<div class="block">Get the scope where a given attribute is defined.</div>
</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>abstract <a href="../../../javax/el/ELContext.html" title="class in javax.el">ELContext</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="../../../javax/servlet/jsp/JspContext.html#getELContext--">getELContext</a></span>()</code></th>
<td class="colLast"> </td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code>abstract <a href="../../../javax/servlet/jsp/el/ExpressionEvaluator.html" title="class in javax.servlet.jsp.el">ExpressionEvaluator</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="../../../javax/servlet/jsp/JspContext.html#getExpressionEvaluator--">getExpressionEvaluator</a></span>()</code></th>
<td class="colLast">
<div class="block"><span class="deprecatedLabel">Deprecated.</span>
<div class="deprecationComment">As of JSP 2.1, replaced by
JspApplicationContext.getExpressionFactory()</div>
</div>
</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code>abstract <a href="../../../javax/servlet/jsp/JspWriter.html" title="class in javax.servlet.jsp">JspWriter</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="../../../javax/servlet/jsp/JspContext.html#getOut--">getOut</a></span>()</code></th>
<td class="colLast">
<div class="block">The current value of the out object (a JspWriter).</div>
</td>
</tr>
<tr id="i8" class="altColor">
<td class="colFirst"><code>abstract <a href="../../../javax/servlet/jsp/el/VariableResolver.html" title="interface in javax.servlet.jsp.el">VariableResolver</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="../../../javax/servlet/jsp/JspContext.html#getVariableResolver--">getVariableResolver</a></span>()</code></th>
<td class="colLast">
<div class="block"><span class="deprecatedLabel">Deprecated.</span>
<div class="deprecationComment">As of JSP 2.1,
replaced by javax.el.ELContext.getELResolver()
which can be obtained by
jspContext.getELContext().getELResolver()</div>
</div>
</td>
</tr>
<tr id="i9" class="rowColor">
<td class="colFirst"><code><a href="../../../javax/servlet/jsp/JspWriter.html" title="class in javax.servlet.jsp">JspWriter</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="../../../javax/servlet/jsp/JspContext.html#popBody--">popBody</a></span>()</code></th>
<td class="colLast">
<div class="block">Return the previous JspWriter "out" saved by the matching
pushBody(), and update the value of the "out" attribute in
the page scope attribute namespace of the JspContext.</div>
</td>
</tr>
<tr id="i10" class="altColor">
<td class="colFirst"><code><a href="../../../javax/servlet/jsp/JspWriter.html" title="class in javax.servlet.jsp">JspWriter</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="../../../javax/servlet/jsp/JspContext.html#pushBody-java.io.Writer-">pushBody</a></span>​(java.io.Writer writer)</code></th>
<td class="colLast">
<div class="block">Return a new JspWriter object that sends output to the
provided Writer.</div>
</td>
</tr>
<tr id="i11" class="rowColor">
<td class="colFirst"><code>abstract void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="../../../javax/servlet/jsp/JspContext.html#removeAttribute-java.lang.String-">removeAttribute</a></span>​(java.lang.String name)</code></th>
<td class="colLast">
<div class="block">Remove the object reference associated with the given name
from all scopes.</div>
</td>
</tr>
<tr id="i12" class="altColor">
<td class="colFirst"><code>abstract void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="../../../javax/servlet/jsp/JspContext.html#removeAttribute-java.lang.String-int-">removeAttribute</a></span>​(java.lang.String name,
int scope)</code></th>
<td class="colLast">
<div class="block">Remove the object reference associated with the specified name
in the given scope.</div>
</td>
</tr>
<tr id="i13" class="rowColor">
<td class="colFirst"><code>abstract void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="../../../javax/servlet/jsp/JspContext.html#setAttribute-java.lang.String-java.lang.Object-">setAttribute</a></span>​(java.lang.String name,
java.lang.Object value)</code></th>
<td class="colLast">
<div class="block">Register the name and value specified with page scope semantics.</div>
</td>
</tr>
<tr id="i14" class="altColor">
<td class="colFirst"><code>abstract void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="../../../javax/servlet/jsp/JspContext.html#setAttribute-java.lang.String-java.lang.Object-int-">setAttribute</a></span>​(java.lang.String name,
java.lang.Object value,
int scope)</code></th>
<td class="colLast">
<div class="block">Register the name and value specified with appropriate
scope semantics.</div>
</td>
</tr>
</table>
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<h3>Methods inherited from class java.lang.Object</h3>
<code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li>
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<h4>JspContext</h4>
<pre>public JspContext()</pre>
<div class="block">Sole constructor. (For invocation by subclass constructors,
typically implicit.)</div>
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<h4>setAttribute</h4>
<pre>public abstract void setAttribute​(java.lang.String name,
java.lang.Object value)</pre>
<div class="block">Register the name and value specified with page scope semantics.
If the value passed in is <code>null</code>, this has the same
effect as calling
<code>removeAttribute( name, PageContext.PAGE_SCOPE )</code>.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>name</code> - the name of the attribute to set</dd>
<dd><code>value</code> - the value to associate with the name, or null if the
attribute is to be removed from the page scope.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>java.lang.NullPointerException</code> - if the name is null</dd>
</dl>
</li>
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<h4>setAttribute</h4>
<pre>public abstract void setAttribute​(java.lang.String name,
java.lang.Object value,
int scope)</pre>
<div class="block">Register the name and value specified with appropriate
scope semantics. If the value passed in is <code>null</code>,
this has the same effect as calling
<code>removeAttribute( name, scope )</code>.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>name</code> - the name of the attribute to set</dd>
<dd><code>value</code> - the object to associate with the name, or null if
the attribute is to be removed from the specified scope.</dd>
<dd><code>scope</code> - the scope with which to associate the name/object</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>java.lang.NullPointerException</code> - if the name is null</dd>
<dd><code>java.lang.IllegalArgumentException</code> - if the scope is invalid</dd>
<dd><code>java.lang.IllegalStateException</code> - if the scope is
PageContext.SESSION_SCOPE but the page that was requested
does not participate in a session or the session has been
invalidated.</dd>
</dl>
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<h4>getAttribute</h4>
<pre>public abstract java.lang.Object getAttribute​(java.lang.String name)</pre>
<div class="block">Returns the object associated with the name in the page scope or null
if not found.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>name</code> - the name of the attribute to get</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the object associated with the name in the page scope
or null if not found.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>java.lang.NullPointerException</code> - if the name is null</dd>
</dl>
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<h4>getAttribute</h4>
<pre>public abstract java.lang.Object getAttribute​(java.lang.String name,
int scope)</pre>
<div class="block">Return the object associated with the name in the specified
scope or null if not found.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>name</code> - the name of the attribute to set</dd>
<dd><code>scope</code> - the scope with which to associate the name/object</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the object associated with the name in the specified
scope or null if not found.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>java.lang.NullPointerException</code> - if the name is null</dd>
<dd><code>java.lang.IllegalArgumentException</code> - if the scope is invalid</dd>
<dd><code>java.lang.IllegalStateException</code> - if the scope is
PageContext.SESSION_SCOPE but the page that was requested
does not participate in a session or the session has been
invalidated.</dd>
</dl>
</li>
</ul>
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<h4>findAttribute</h4>
<pre>public abstract java.lang.Object findAttribute​(java.lang.String name)</pre>
<div class="block">Searches for the named attribute in page, request, session (if valid),
and application scope(s) in order and returns the value associated or
null.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>name</code> - the name of the attribute to search for</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the value associated or null</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>java.lang.NullPointerException</code> - if the name is null</dd>
</dl>
</li>
</ul>
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<h4>removeAttribute</h4>
<pre>public abstract void removeAttribute​(java.lang.String name)</pre>
<div class="block">Remove the object reference associated with the given name
from all scopes. Does nothing if there is no such object.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>name</code> - The name of the object to remove.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>java.lang.NullPointerException</code> - if the name is null</dd>
</dl>
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<h4>removeAttribute</h4>
<pre>public abstract void removeAttribute​(java.lang.String name,
int scope)</pre>
<div class="block">Remove the object reference associated with the specified name
in the given scope. Does nothing if there is no such object.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>name</code> - The name of the object to remove.</dd>
<dd><code>scope</code> - The scope where to look.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>java.lang.IllegalArgumentException</code> - if the scope is invalid</dd>
<dd><code>java.lang.IllegalStateException</code> - if the scope is
PageContext.SESSION_SCOPE but the page that was requested
does not participate in a session or the session has been
invalidated.</dd>
<dd><code>java.lang.NullPointerException</code> - if the name is null</dd>
</dl>
</li>
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<h4>getAttributesScope</h4>
<pre>public abstract int getAttributesScope​(java.lang.String name)</pre>
<div class="block">Get the scope where a given attribute is defined.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>name</code> - the name of the attribute to return the scope for</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the scope of the object associated with the name specified or 0</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>java.lang.NullPointerException</code> - if the name is null</dd>
</dl>
</li>
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<h4>getAttributeNamesInScope</h4>
<pre>public abstract java.util.Enumeration<java.lang.String> getAttributeNamesInScope​(int scope)</pre>
<div class="block">Enumerate all the attributes in a given scope.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>scope</code> - the scope to enumerate all the attributes for</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>an enumeration of names (java.lang.String) of all the
attributes the specified scope</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>java.lang.IllegalArgumentException</code> - if the scope is invalid</dd>
<dd><code>java.lang.IllegalStateException</code> - if the scope is
PageContext.SESSION_SCOPE but the page that was requested
does not participate in a session or the session has been
invalidated.</dd>
</dl>
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<h4>getOut</h4>
<pre>public abstract <a href="../../../javax/servlet/jsp/JspWriter.html" title="class in javax.servlet.jsp">JspWriter</a> getOut()</pre>
<div class="block">The current value of the out object (a JspWriter).</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the current JspWriter stream being used for client response</dd>
</dl>
</li>
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<h4>getExpressionEvaluator</h4>
<pre>public abstract <a href="../../../javax/servlet/jsp/el/ExpressionEvaluator.html" title="class in javax.servlet.jsp.el">ExpressionEvaluator</a> getExpressionEvaluator()</pre>
<div class="deprecationBlock"><span class="deprecatedLabel">Deprecated.</span>
<div class="deprecationComment">As of JSP 2.1, replaced by
JspApplicationContext.getExpressionFactory()</div>
</div>
<div class="block">Provides programmatic access to the ExpressionEvaluator.
The JSP Container must return a valid instance of an
ExpressionEvaluator that can parse EL expressions.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>A valid instance of an ExpressionEvaluator.</dd>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>2.0</dd>
</dl>
</li>
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<h4>getELContext</h4>
<pre>public abstract <a href="../../../javax/el/ELContext.html" title="class in javax.el">ELContext</a> getELContext()</pre>
</li>
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<h4>getVariableResolver</h4>
<pre>public abstract <a href="../../../javax/servlet/jsp/el/VariableResolver.html" title="interface in javax.servlet.jsp.el">VariableResolver</a> getVariableResolver()</pre>
<div class="deprecationBlock"><span class="deprecatedLabel">Deprecated.</span>
<div class="deprecationComment">As of JSP 2.1,
replaced by javax.el.ELContext.getELResolver()
which can be obtained by
jspContext.getELContext().getELResolver()</div>
</div>
<div class="block">Returns an instance of a VariableResolver that provides access to the
implicit objects specified in the JSP specification using this JspContext
as the context object.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>A valid instance of a VariableResolver.</dd>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>2.0</dd>
</dl>
</li>
</ul>
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<h4>pushBody</h4>
<pre>public <a href="../../../javax/servlet/jsp/JspWriter.html" title="class in javax.servlet.jsp">JspWriter</a> pushBody​(java.io.Writer writer)</pre>
<div class="block">Return a new JspWriter object that sends output to the
provided Writer. Saves the current "out" JspWriter,
and updates the value of the "out" attribute in the
page scope attribute namespace of the JspContext.
<p>The returned JspWriter must implement all methods and
behave as though it were unbuffered. More specifically:
</p>
<ul>
<li>clear() must throw an IOException</li>
<li>clearBuffer() does nothing</li>
<li>getBufferSize() always returns 0</li>
<li>getRemaining() always returns 0</li>
</ul></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>writer</code> - The Writer for the returned JspWriter to send
output to.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>a new JspWriter that writes to the given Writer.</dd>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>2.0</dd>
</dl>
</li>
</ul>
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<h4>popBody</h4>
<pre>public <a href="../../../javax/servlet/jsp/JspWriter.html" title="class in javax.servlet.jsp">JspWriter</a> popBody()</pre>
<div class="block">Return the previous JspWriter "out" saved by the matching
pushBody(), and update the value of the "out" attribute in
the page scope attribute namespace of the JspContext.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the saved JspWriter.</dd>
</dl>
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