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<div class="subTitle">javax.servlet.jsp.tagext</div>
<h2 title="Class TagLibraryValidator" class="title">Class TagLibraryValidator</h2>
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<li>java.lang.Object</li>
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<li>javax.servlet.jsp.tagext.TagLibraryValidator</li>
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<pre>public abstract class <span class="typeNameLabel">TagLibraryValidator</span>
extends java.lang.Object</pre>
<div class="block">Translation-time validator class for a JSP page.
A validator operates on the XML view associated with the JSP page.
<p>
The TLD file associates a TagLibraryValidator class and some init
arguments with a tag library.
<p>
The JSP container is responsible for locating an appropriate
instance of the appropriate subclass by
<ul>
<li> new a fresh instance, or reuse an available one
<li> invoke the setInitParams(Map) method on the instance
</ul>
once initialized, the validate(String, String, PageData) method will
be invoked, where the first two arguments are the prefix
and uri for this tag library in the XML View. The prefix is intended
to make it easier to produce an error message. However, it is not
always accurate. In the case where a single URI is mapped to more
than one prefix in the XML view, the prefix of the first URI is provided.
Therefore, to provide high quality error messages in cases where the
tag elements themselves are checked, the prefix parameter should be
ignored and the actual prefix of the element should be used instead.
TagLibraryValidators should always use the uri to identify elements
as beloning to the tag library, not the prefix.
<p>
A TagLibraryValidator instance
may create auxiliary objects internally to perform
the validation (e.g. an XSchema validator) and may reuse it for all
the pages in a given translation run.
<p>
The JSP container is not guaranteed to serialize invocations of
validate() method, and TagLibraryValidators should perform any
synchronization they may require.
<p>
As of JSP 2.0, a JSP container must provide a jsp:id attribute to
provide higher quality validation errors.
The container will track the JSP pages
as passed to the container, and will assign to each element
a unique "id", which is passed as the value of the jsp:id
attribute. Each XML element in the XML view available will
be extended with this attribute. The TagLibraryValidator
can then use the attribute in one or more ValidationMessage
objects. The container then, in turn, can use these
values to provide more precise information on the location
of an error.
<p>
The actual prefix of the <code>id</code> attribute may or may not be
<code>jsp</code> but it will always map to the namespace
<code>http://java.sun.com/JSP/Page</code>. A TagLibraryValidator
implementation must rely on the uri, not the prefix, of the <code>id</code>
attribute.</div>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../javax/servlet/jsp/tagext/TagLibraryValidator.html#TagLibraryValidator--">TagLibraryValidator</a></span>()</code>
<div class="block">Sole constructor.</div>
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<td class="colFirst"><code>java.util.Map<java.lang.String,java.lang.Object></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../javax/servlet/jsp/tagext/TagLibraryValidator.html#getInitParameters--">getInitParameters</a></span>()</code>
<div class="block">Get the init parameters data as an immutable Map.</div>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../javax/servlet/jsp/tagext/TagLibraryValidator.html#release--">release</a></span>()</code>
<div class="block">Release any data kept by this instance for validation purposes.</div>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../javax/servlet/jsp/tagext/TagLibraryValidator.html#setInitParameters-java.util.Map-">setInitParameters</a></span>(java.util.Map<java.lang.String,java.lang.Object> map)</code>
<div class="block">Set the init data in the TLD for this validator.</div>
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<td class="colFirst"><code><a href="../../../../javax/servlet/jsp/tagext/ValidationMessage.html" title="class in javax.servlet.jsp.tagext">ValidationMessage</a>[]</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../javax/servlet/jsp/tagext/TagLibraryValidator.html#validate-java.lang.String-java.lang.String-javax.servlet.jsp.tagext.PageData-">validate</a></span>(java.lang.String prefix,
java.lang.String uri,
<a href="../../../../javax/servlet/jsp/tagext/PageData.html" title="class in javax.servlet.jsp.tagext">PageData</a> page)</code>
<div class="block">Validate a JSP page.</div>
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<h4>TagLibraryValidator</h4>
<pre>public TagLibraryValidator()</pre>
<div class="block">Sole constructor. (For invocation by subclass constructors,
typically implicit.)</div>
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<pre>public void setInitParameters(java.util.Map<java.lang.String,java.lang.Object> map)</pre>
<div class="block">Set the init data in the TLD for this validator.
Parameter names are keys, and parameter values are the values.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>map</code> - A Map describing the init parameters</dd>
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<pre>public java.util.Map<java.lang.String,java.lang.Object> getInitParameters()</pre>
<div class="block">Get the init parameters data as an immutable Map.
Parameter names are keys, and parameter values are the values.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The init parameters as an immutable map.</dd>
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<h4>validate</h4>
<pre>public <a href="../../../../javax/servlet/jsp/tagext/ValidationMessage.html" title="class in javax.servlet.jsp.tagext">ValidationMessage</a>[] validate(java.lang.String prefix,
java.lang.String uri,
<a href="../../../../javax/servlet/jsp/tagext/PageData.html" title="class in javax.servlet.jsp.tagext">PageData</a> page)</pre>
<div class="block">Validate a JSP page.
This will get invoked once per unique tag library URI in the
XML view. This method will return null if the page is valid; otherwise
the method should return an array of ValidationMessage objects.
An array of length zero is also interpreted as no errors.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>prefix</code> - the first prefix with which the tag library is
associated, in the XML view. Note that some tags may use
a different prefix if the namespace is redefined.</dd>
<dd><code>uri</code> - the tag library's unique identifier</dd>
<dd><code>page</code> - the JspData page object</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>A null object, or zero length array if no errors, an array
of ValidationMessages otherwise.</dd>
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<pre>public void release()</pre>
<div class="block">Release any data kept by this instance for validation purposes.</div>
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