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#!/usr/bin/perl |
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package Class::Workflow::Transition::Validate::Simple; |
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use Moose::Role; |
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with qw/ |
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Class::Workflow::Transition |
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Class::Workflow::Transition::Validate |
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/; |
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has error_state => ( |
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does => "Class::Workflow::State", |
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is => "rw", |
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); |
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has no_die => ( |
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isa => "Bool", |
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is => "rw", |
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default => 0, |
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); |
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has validators => ( |
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isa => "ArrayRef", |
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is => "rw", |
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auto_deref => 1, |
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default => sub { [] }, |
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); |
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has ignore_validator_rv => ( |
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isa => "Bool", |
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is => "rw", |
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default => 0, |
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); |
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sub add_validators { |
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my ( $self, @validators ) = @_; |
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push @{ $self->validators }, @validators; |
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} |
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sub clear_validators { |
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my $self = shift; |
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$self->validators([]); |
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} |
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sub validate { |
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my ( $self, $instance, @args ) = @_; |
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my $ignore_rv = $self->ignore_validator_rv; |
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my @errors; |
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foreach my $validator ( $self->validators ) { |
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local $@; |
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my $ok = eval { $self->$validator( $instance, @args ) }; |
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if ( $@ ) { |
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push @errors, $@; |
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} elsif ( !$ignore_rv and !$ok ) { |
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push @errors, "general error"; |
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} |
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} |
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s/ at .* line \d+\.\n//s for @errors; |
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die join(", ", @errors) . "\n" if @errors; |
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# FIXME add @errors to an exception object that stringifies |
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return 1; |
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} |
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sub validation_error { |
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my ( $self, $error, $instance, @args ) = @_; |
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chomp $error unless ref $error; |
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if ( my $state = $self->error_state ) { |
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return $self->derive_and_accept_instance( |
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$instance => { |
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state => $state, |
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error => $error |
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}, |
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@args |
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); |
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} else { |
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if ( $self->no_die ) { |
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return $self->derive_and_accept_instance( |
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$instance => { |
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state => $instance->state, |
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error => $error, |
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}, |
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@args |
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); |
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} else { |
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die $error; |
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} |
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} |
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} |
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__PACKAGE__; |
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__END__ |
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=pod |
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=head1 NAME |
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Class::Workflow::Transition::Validate::Simple - Easier validation code. |
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=head1 SYNOPSIS |
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109
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package MyTransition; |
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use Moose; |
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112
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with qw/Class::Workflow::Transition::Validate::Simple/; |
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114
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# ... |
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$t->clear_validators; |
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$t->add_validators( sub { ... } ); |
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=head1 DESCRIPTION |
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=head1 FIELDS |
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123
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=over 4 |
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125
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=item ignore_validator_rv |
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This is useful if your validators only throw exceptions. |
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129
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Defaults to false |
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=item error_state |
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133
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This contains a state that will be moved to if a validation error occurs. |
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135
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In conjunction with L<Class::Workflow::State::AutoApply> this can work like a |
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catch block. |
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The instance will have the C<error> attribute set. |
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=item no_die |
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If this is set, C<validation_error> will not die even if C<error_state> is |
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not set. |
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The instance will have the C<error> attribute set, and will be reaccepted into |
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it's current state, with the error. |
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=back |
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=head1 METHODS |
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=over 4 |
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154
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=item validators |
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This is an optional list of sub refs which will be called to validate input |
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before applying C<body>. |
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They should raise an exception or return a false value if the input is bad. |
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They may put validation result information inside the |
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L<Class::Workflow::Context> or equivalent, if one is used. |
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164
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A more comprehensive solution is to override the C<validate> method yourself |
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and provide rich exception objects with validation error descriptors inside |
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them. |
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168
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The validators are invoked as methods on the transition. |
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170
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IF C<ignore_validator_rv> is true then only exceptions are considered input |
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validations. |
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173
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=item add_validators @code_refs |
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175
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=item clear_validators |
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177
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Modify the list of validators. |
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179
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=back |
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181
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=head1 ROLES |
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183
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This role consumes the following roles: |
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185
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=over 4 |
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187
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=item * |
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189
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L<Class::Workflow::Transition::Validate> |
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191
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=back |
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193
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=cut |
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