InfoSys::FreeDB::Response::Read - FreeDB read response

 require InfoSys::FreeDB;
 require InfoSys::FreeDB::Entry;

 # Read entry from the default CD device
 my $entry = InfoSys::FreeDB::Entry->new_from_cdparanoia();

 # Create a HTTP connection
 my $fact = InfoSys::FreeDB->new();
 my $conn = $fact->create_connection( {
     client_name => 'testing-InfoSys::FreeDB',
     client_version => $InfoSys::FreeDB::VERSION,
 } );

 # Query FreeDB
 my $res_q = $conn->query( $entry );
 scalar( $res_q->get_match() ) ||
     die 'no matches found for the disck in the default CD-Rom drive';

 # Read the first match
 my $res_r = $conn->read( ( $res_q->get_match() )[0] );

 # Write the entry to STDERR
 use IO::Handle;
 my $fh = IO::Handle->new_from_fd( fileno(STDERR), 'w' );
 $res_r->get_entry()->write_fh( $fh );

package InfoSys::FreeDB::Response::Read;

use 5.006;
use base qw( InfoSys::FreeDB::Response );
use strict;
use warnings;
use AutoLoader qw(AUTOLOAD);
use Error qw(:try);
use InfoSys::FreeDB::Response qw(:line_parse);

# Used by _value_is_allowed
our %ALLOW_ISA = (
    'entry' => [ 'InfoSys::FreeDB::Entry' ],
);

# Used by _value_is_allowed
our %ALLOW_REF = (
);

# Used by _value_is_allowed
our %ALLOW_RX = (
);

# Used by _value_is_allowed
our %ALLOW_VALUE = (
);

# Package version
our ($VERSION) = '$Revision: 0.92 $' =~ /\$Revision:\s+([^\s]+)/;

1;

__END__

sub new_from_content_ref {
    my $class = shift;
    my $content_ref = shift;

    # Convert $opt->{content_ref} to @content_ref
    my @content_ref = split(/[\n\r]+/, ${$content_ref} );

    # Parse first line
    my $line = shift(@content_ref);
    my ($code, $tail) = $line =~ /$CODE_RX/;
    defined ($code) ||
        throw Error::Simple ('ERROR: InfoSys::FreeDB::Response::Read::new_from_content_ref, first line of specified \'content_ref\' does not contain a code.');
    my %opt;
    if ($code == 210) {
        pop( @content_ref);
        require InfoSys::FreeDB::Entry;
        %opt = (
            code => $code,
            result => 'OK',
            entry => InfoSys::FreeDB::Entry->new_from_array_ref( \@content_ref),
        );
    }
    elsif ($code == 211) {
        pop(@content_ref);
        my @match = ();
        require InfoSys::FreeDB::Match;
        foreach my $line (@content_ref) {
            my @line = split(/\s+/, $line, 3);
            push(@match, InfoSys::FreeDB::Match->new( {
                categ => $line[0],
                discid => $line[1],
                dtitle => $line[2],
            } ) );
        }
        %opt = (
            code => $code,
            result => 'Found inexact matches',
            match => \@match,
        );
    }
    elsif ($code == 401) {
        %opt = (
            code => $code,
            error => 1,
            result => 'Specified CDDB entry not found',
        );
    }
    elsif ($code == 402) {
        %opt = (
            code => $code,
            error => 1,
            result => 'Server error',
        );
    }
    elsif ($code == 403) {
        %opt = (
            code => $code,
            error => 1,
            result => 'Database entry is corrupt',
        );
    }
    elsif ($code == 409) {
        %opt = (
            code => $code,
            error => 1,
            result => 'No handshake',
        );
    }
    else {
        throw Error::Simple ("ERROR: InfoSys::FreeDB::Response::Read::new_from_content_ref, unknown code '$code' returned. Allowed codes are 210, 211, 401, 402, 403 and 409.");
    }

    # Create a new object and return it
    return( $class->new( \%opt ) );
}

sub _initialize {
    my $self = shift;
    my $opt = defined($_[0]) ? shift : {};

    # Check $opt
    ref($opt) eq 'HASH' || throw Error::Simple("ERROR: InfoSys::FreeDB::Response::Read::_initialize, first argument must be 'HASH' reference.");

    # entry, SINGLE
    exists( $opt->{entry} ) && $self->set_entry( $opt->{entry} );

    # Call the superclass' _initialize
    $self->SUPER::_initialize($opt);

    # Return $self
    return($self);
}

sub _value_is_allowed {
    my $name = shift;

    # Value is allowed if no ALLOW clauses exist for the named attribute
    if ( ! exists( $ALLOW_ISA{$name} ) && ! exists( $ALLOW_REF{$name} ) && ! exists( $ALLOW_RX{$name} ) && ! exists( $ALLOW_VALUE{$name} ) ) {
        return(1);
    }

    # At this point, all values in @_ must to be allowed
    CHECK_VALUES:
    foreach my $val (@_) {
        # Check ALLOW_ISA
        if ( ref($val) && exists( $ALLOW_ISA{$name} ) ) {
            foreach my $class ( @{ $ALLOW_ISA{$name} } ) {
                &UNIVERSAL::isa( $val, $class ) && next CHECK_VALUES;
            }
        }

        # Check ALLOW_REF
        if ( ref($val) && exists( $ALLOW_REF{$name} ) ) {
            exists( $ALLOW_REF{$name}{ ref($val) } ) && next CHECK_VALUES;
        }

        # Check ALLOW_RX
        if ( defined($val) && ! ref($val) && exists( $ALLOW_RX{$name} ) ) {
            foreach my $rx ( @{ $ALLOW_RX{$name} } ) {
                $val =~ /$rx/ && next CHECK_VALUES;
            }
        }

        # Check ALLOW_VALUE
        if ( ! ref($val) && exists( $ALLOW_VALUE{$name} ) ) {
            exists( $ALLOW_VALUE{$name}{$val} ) && next CHECK_VALUES;
        }

        # We caught a not allowed value
        return(0);
    }

    # OK, all values are allowed
    return(1);
}

sub get_entry {
    my $self = shift;

    return( $self->{InfoSys_FreeDB_Response_Read}{entry} );
}

sub set_entry {
    my $self = shift;
    my $val = shift;

    # Check if isa/ref/rx/value is allowed
    &_value_is_allowed( 'entry', $val ) || throw Error::Simple("ERROR: InfoSys::FreeDB::Response::Read::set_entry, the specified value '$val' is not allowed.");

    # Assignment
    $self->{InfoSys_FreeDB_Response_Read}{entry} = $val;
}