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<h1 class="headline">Template::Exception</h1>
<h2 class="subhead">Exception handling class module</h1>
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<li class=""><a href="#SYNOPSIS">SYNOPSIS</a></li>
<li class=""><a href="#DESCRIPTION">DESCRIPTION</a></li>
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<li class="sub"><a href="#method_type">type()</a></li>
<li class="sub"><a href="#method_info">info()</a></li>
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<h1 id="SYNOPSIS" onclick="switch_section(this)" title="Click title to show/hide section content.">SYNOPSIS</h1>
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<pre>use Template::Exception;
my $exception = Template::Exception->new($type, $info);
$type = $exception->type;
$info = $exception->info;
($type, $info) = $exception->type_info;
print $exception->as_string();
$handler = $exception->select_handler(\@candidates);</pre>
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<p>
The <code>Template::Exception</code> module defines an object class for
representing exceptions within the template processing life cycle.
Exceptions can be raised by modules within the Template Toolkit, or can
be generated and returned by user code bound to template variables.
</p>
<p>
Exceptions can be raised in a template using the <code>THROW</code>
directive,
</p>
<pre><span class="tt">[% THROW user.login 'no user id: please login' %]</span></pre>
<p>
or by calling the <a href="../../modules/Template/Context.html#method_throw">throw()</a> method on the current <a href="../../modules/Template/Context.html">Template::Context</a> object,
</p>
<pre>$context->throw('user.passwd', 'Incorrect Password');
$context->throw('Incorrect Password'); # type 'undef'</pre>
<p>
or from Perl code by calling <code>die()</code> with a
<code>Template::Exception</code> object,
</p>
<pre>die (Template::Exception->new('user.denied', 'Invalid User ID'));</pre>
<p>
or by simply calling <code>die()</code> with an error string. This is
automagically caught and converted to an exception of
'<code>undef</code>' type (that's the literal string '<code>undef</code>'
rather than Perl's undefined value) which can then be handled in the
usual way.
</p>
<pre>die "I'm sorry Dave, I can't do that";</pre>
<p>
Each exception is defined by its type and a information component (e.g.
error message). The type can be any identifying string and may contain
dotted components (e.g. '<code>foo</code>', '<code>foo.bar</code>',
'<code>foo.bar.baz</code>'). Exception types are considered to be
hierarchical such that '<code>foo.bar</code>' would be a specific type of
the more general '<code>foo</code>' type.
</p>
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<h1 id="METHODS" onclick="switch_section(this)" title="Click title to show/hide section content.">METHODS</h1>
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<h2 id="method_type" class="method" onclick="switch_subsection(this)" title="Click title to show/hide sub-section content.">type()</h2>
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<p>
Returns the exception type.
</p>
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<h2 id="method_info" class="method" onclick="switch_subsection(this)" title="Click title to show/hide sub-section content.">info()</h2>
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<p>
Returns the exception information.
</p>
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<h1 id="AUTHOR" onclick="switch_section(this)" title="Click title to show/hide section content.">AUTHOR</h1>
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<p>
Andy Wardley <abw@wardley.org> <a
href="http://wardley.org/">http://wardley.org/</a>
</p>
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<p>
Copyright (C) 1996-2007 Andy Wardley. All Rights Reserved.
</p>
<p>
This module is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
</p>
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</div>
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<p>
<a href="../../modules/Template.html">Template</a>, <a href="../../modules/Template/Context.html">Template::Context</a>
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