NAME

Catmandu::Importer - Namespace for packages that can import

SYNOPSIS

    package Catmandu::Importer::Hello;

    use Catmandu::Sane;
    use Moo;

    with 'Catmandu::Importer';

    sub generator {
        my ($self) = @_;
        state $fh = $self->fh;
        my $n = 0;
        return sub {
            $self->log->debug("generating record " . ++$n);
            my $name = $self->readline;
            return defined $name ? { "hello" => $name } : undef;
        };
    }

    package main;

    use Catmandu;

    my $importer = Catmandu->importer('Hello', file => '/tmp/names.txt');
    $importer->each(sub {
        my $items = shift;
        .
        .
        .
    });

    # Or on the command line
    $ catmandu convert Hello to YAML < /tmp/names.txt
    # Fetch remote content
    $ catmandu convert JSON --file http://example.com/data.json to YAML

DESCRIPTION

A Catmandu::Importer is a Perl package that can import data from an external source (a file, the network, ...). Most importers read from an input stream, such as STDIN, a given file, or an URL to fetch data from, so this base class provides helper method for consuming the input stream once.

Every Catmandu::Importer is a Catmandu::Fixable and thus inherits a 'fix' parameter that can be set in the constructor. When given then each item returned by the generator will be automatically Fixed using one or more Catmandu::Fixes. E.g.

    my $importer = Catmandu->importer('Hello',fix => ['upcase(hello)']);
    $importer->each( sub {
        my $item = shift ; # Every item will be upcased... 
    } );

Every Catmandu::Importer is a Catmandu::Iterable and inherits the methods (first, each, to_array...) etc.

CONFIGURATION

file

Read input from a local file given by its path. If the path looks like a url, the content will be fetched first and then passed to the importer. Alternatively a scalar reference can be passed to read from a string.

fh

Read input from an IO::Handle. If not specified, Catmandu::Util::io is used to create the input stream from the file argument or by using STDIN.

encoding

Binmode of the input stream fh. Set to :utf8 by default.

fix

An ARRAY of one or more fixes or file scripts to be applied to imported items.

data_path

The data at data_path is imported instead of the original data.

   # given this imported item:
   {abc => [{a=>1},{b=>2},{c=>3}]}
   # with data_path 'abc', this item gets imported instead:
   [{a=>1},{b=>2},{c=>3}]
   # with data_path 'abc.*', 3 items get imported:
   {a=>1}
   {b=>2}
   {c=>3}

variables

Variables given here will interpolate the file and http_body options. The syntax is the same as URI::Template.

    # named arguments
    my $importer = Catmandu->importer('Hello',
        file => 'http://example.com/{id}',
        variables => {id => 1234},
    );
    # positional arguments
    {variables => "1234,768"}
    # or
    {variables => [1234,768]}

HTTP CONFIGURATION

These options are only relevant if file is a url. See LWP::UserAgent for details about these options.

http_method

http_headers

http_agent

http_max_redirect

http_timeout

http_verify_hostname

METHODS

readline

Read a line from the input stream. Equivalent to $importer->fh->getline.

readall

Read the whole input stream as string.

first, each, rest , ...

See Catmandu::Iterable for all inherited methods.

SEE ALSO

Catmandu::Iterable , Catmandu::Fix , Catmandu::Importer::CSV, Catmandu::Importer::JSON , Catmandu::Importer::YAML