NAME
Error::Hierarchy - Support for hierarchical exception classes
VERSION
version 1.103530
SYNOPSIS
package Error::Hierarchy::ReadOnlyAttribute;
use warnings;
use strict;
use base 'Error::Hierarchy';
__PACKAGE__->mk_accessors(qw(attribute));
use constant default_message => '[%s] is a read only attribute';
use constant PROPERTIES => ( 'attribute' );
# Meanwhile...
package main;
use Error::Hierarchy::Mixin;
sub foo {
if (@_) {
Error::Hierarchy::ReadOnlyAttribute->
throw(attribute => 'foo');
}
}
DESCRIPTION
This class provides support for hierarchical exception classes. It
builds upon Error and is thus compatible with its "try"/"catch"
mechanism. However, it records a lot more information such as the
package, filename and line where the exception occurred, a complete
stack trace, the hostname and a UUID.
It provides a stringification that is extensible with any properties
your own exceptions might define.
METHODS
depth
Get or set the caller depth, that is the number of call stack frames
that are skipped when reporting the package, filename and line the error
was thrown from. When an exception object is constructed, it defaults to
0. This is useful if you want to throw an exception from the perspective
of your own caller. For example:
sub assert_foo {
unless ($teh_foo) {
throw SomeException(depth => 1);
}
}
Without the "depth" argument, the exception would show that it was
thrown within "assert_foo()". Maybe that's what you want, but with
"depth()" you can make it appear as if the exception was thrown from the
place where "assert_foo()" was called from.
The actual exception depth is influenced by "error_depth()" as well.
error_depth
Like "depth()", but here the value should be defined within the
exception class code itself. Therefore, you can't set the value, but
subclasses can override it. Some exceptions should always be thrown from
the caller's perspective (or even higher up); use "error_depth()" for
this case. "depth()" by contrast is intended for the user to be set; the
two are added together to get the actual depth. In this class the
"error_depth()" defaults to 1 so the exception is at least reported from
the place where it was actually thrown - a value of 0 would mean that
the exception is reported as having occurred Error::Hierarchy itself,
which is probably not what you want.
If you override this value in a subclass, it's probably a good idea to
add the subclass' desired depth to the superclass's depth to accumulate
it. For example:
package MyException;
use base 'Error::Hierarchy';
sub error_depth {
my $self = shift;
1 + $self->SUPER::error_depth();
}
comparable
Support for Data::Comparable.
init
Initializes a newly constructed exception object.
get_properties
Actual exception classes will subclass this class and define properties.
Exception classes themselves can be subclassed. So this method returns
the inherited list of all the exception class' properties.
properties_as_hash
Constructs a hash whose keys are the exception's properties - see
"get_properties()" - and whose values are the values of each property in
the exception object. The properties "package", "filename" and "line"
are omitted.
In list context, the hash is returned as is. In scalar context, a
reference to the hash is returned.
stringify
Defines how the exception should look if the object is stringified. This
class inherits from Error::Hierarchy::Base, which overloads "" to call
"stringify()".
This class stringifies an itself by taking the "message()" attribute and
passing it to "sprintf()", along with the exception's properties.
transmute($exception, %args)
Transmutes an existing exception. It leaves the stack trace, filename,
line etc. as it is and just blesses it into the class on which
"transmute()" was called, adding the given additional arguments. This is
used when catching a generic exception and turning it into a more
specific one.
INSTALLATION
See perlmodinstall for information and options on installing Perl
modules.
BUGS AND LIMITATIONS
No bugs have been reported.
Please report any bugs or feature requests through the web interface at
<http://rt.cpan.org/Public/Dist/Display.html?Name=Error-Hierarchy>.
AVAILABILITY
The latest version of this module is available from the Comprehensive
Perl Archive Network (CPAN). Visit <http://www.perl.com/CPAN/> to find a
CPAN site near you, or see
<http://search.cpan.org/dist/Error-Hierarchy/>.
The development version lives at
<http://github.com/hanekomu/Error-Hierarchy> and may be cloned from
<git://github.com/hanekomu/Error-Hierarchy>. Instead of sending patches,
please fork this project using the standard git and github
infrastructure.
AUTHOR
Marcel Gruenauer <marcel@cpan.org>
COPYRIGHT AND LICENSE
This software is copyright (c) 2004 by Marcel Gruenauer.
This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.