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package Web::NewsAPI::Result; |
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use Moose; |
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use Web::NewsAPI::Article; |
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has 'page' => ( |
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is => 'rw', |
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isa => 'Int', |
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default => 1, |
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trigger => sub { $_[0]->reset }, |
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); |
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has 'page_size' => ( |
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is => 'rw', |
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isa => 'Int', |
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default => 20, |
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trigger => sub { $_[0]->reset }, |
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); |
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has 'total_results' => ( |
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is => 'rw', |
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isa => 'Int', |
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lazy_build => 1, |
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clearer => 'clear_total_results', |
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); |
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has 'articles_ref' => ( |
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is => 'rw', |
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isa => 'ArrayRef[Web::NewsAPI::Article]', |
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lazy_build => 1, |
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clearer => 'clear_articles_ref', |
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); |
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has 'query_results' => ( |
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is => 'rw', |
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isa => 'HashRef', |
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lazy_build => 1, |
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clearer => 'clear_query_results', |
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); |
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has 'newsapi' => ( |
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is => 'ro', |
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required => 1, |
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isa => 'Web::NewsAPI', |
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); |
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has 'api_endpoint' => ( |
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is => 'ro', |
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required => 1, |
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isa => 'Str', |
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); |
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has 'api_args' => ( |
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is => 'ro', |
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isa => 'HashRef', |
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required => 1, |
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); |
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sub BUILD { |
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1581
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my $self = shift; |
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if ( defined $self->api_args->{pageSize} ) { |
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$self->page_size( $self->api_args->{pageSize} ) |
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} |
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if ( defined $self->api_args->{page} ) { |
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$self->page( $self->api_args->{page} ) |
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} |
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return $self; |
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} |
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sub articles { |
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my $self = shift; |
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77
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return @{ $self->articles_ref }; |
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136
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} |
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80
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sub turn_page { |
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my $self = shift; |
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$self->page( $self->page + 1 ); |
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} |
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86
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sub turn_page_back { |
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my $self = shift; |
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if ( $self->page > 1 ) { |
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$self->page( $self->page - 1 ); |
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} |
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} |
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94
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sub _build_articles_ref { |
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5
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10
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my $self = shift; |
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97
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5
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my @articles; |
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99
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for my $article_data (@{ $self->query_results->{articles} }) { |
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134
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100
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push @articles, Web::NewsAPI::Article->new( |
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%$article_data, |
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source => Web::NewsAPI::Source->new( |
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id => $article_data->{source}->{id}, |
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name => $article_data->{source}->{name}, |
105
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8
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5158
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), |
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); |
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} |
108
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109
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4
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3981
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return \@articles; |
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}; |
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112
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sub _build_query_results { |
113
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my $self = shift; |
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115
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my %args = %{ $self->api_args }; |
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124
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116
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140
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$args{ pageSize } = $self->page_size; |
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172
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$args{ page } = $self->page; |
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119
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5
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132
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my ($articles, $total_results) = |
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$self->newsapi->_request( |
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$self->api_endpoint, |
122
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'articles', |
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%args, |
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) |
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; |
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127
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return { |
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4
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150
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articles => $articles, |
129
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total_results => $total_results, |
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}; |
131
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} |
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133
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sub _build_total_results { |
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3
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3
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8
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my $self = shift; |
135
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136
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3
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84
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return $self->query_results->{total_results}; |
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} |
138
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139
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sub _make_articles { |
140
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my ($self, @article_data) = @_; |
141
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my @articles; |
142
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for my $article_data (@article_data) { |
143
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push @articles, Web::NewsAPI::Article->new( |
144
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%$article_data, |
145
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source => Web::NewsAPI::Source->new( |
146
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id => $article_data->{source}->{id}, |
147
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name => $article_data->{source}->{name}, |
148
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0
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), |
149
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); |
150
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} |
151
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0
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0
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return @articles; |
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} |
153
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154
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sub reset { |
155
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10
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10
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0
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20
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my $self = shift; |
156
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157
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10
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324
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$self->clear_articles_ref; |
158
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10
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305
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$self->clear_query_results; |
159
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10
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295
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$self->clear_total_results; |
160
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} |
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162
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1; |
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164
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=head1 NAME |
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166
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Web::NewsAPI::Result - Object representing a News API query result. |
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168
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=head1 SYNOPSIS |
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170
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use v5.10; |
171
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use Web::NewsAPI; |
172
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173
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my $newsapi = Web::NewsAPI->new( |
174
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api_key => $my_secret_api_key, |
175
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); |
176
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177
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say "Here are some top American-news headlines about science..."; |
178
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my $result = $newsapi->top_headlines( |
179
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category => 'science', country => 'us', |
180
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); |
181
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182
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my $count = $result->total_results; |
183
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say "There are $count such headlines in the news right now."; |
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185
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say "Here are the top headlines..."; |
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print_articles(); |
187
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188
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say "And here's page two..."; |
189
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$result->turn_page; |
190
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print_articles(); |
191
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192
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sub print_articles { |
193
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for my $article ( $result->articles ) { |
194
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say $article->title; |
195
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say $article->description; |
196
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print "\n"; |
197
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} |
198
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} |
199
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200
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=head1 DESCRIPTION |
201
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202
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Objects of this class represent the result of a News API query, such as |
203
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C<top-headlines> or C<everything>. Generally, you won't create these |
204
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objects yourself; you'll get them as a result of calling L<methods on a |
205
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Web::NewsAPI object|Web::NewsAPI/"Object methods">. |
206
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207
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An Web::NewsAPI::Result object gives you methods to retrieve one "page" of |
208
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articles, change the current page or page-size, and get the count of all |
209
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articles in the current set. |
210
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211
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=head1 METHODS |
212
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213
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=head2 Object attributes |
214
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215
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=head3 page |
216
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217
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my $current_page = $result->page; |
218
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$result->page( 2 ); |
219
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220
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The current page of results that L<"artciles"> will return, expressed as |
221
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an integer. |
222
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223
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Default: 1. |
224
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225
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=head3 page_size |
226
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227
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my $page_size = $result->page_size; |
228
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$result->page_size( 10 ); |
229
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230
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How many articles to return per call to L<"articles">. |
231
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232
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Default: 20. |
233
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234
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=head2 Object methods |
235
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236
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=head3 articles |
237
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238
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|
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my @articles = $result->articles; |
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Returns all the L<Web::NewsAPI::Article> objects that constitute the |
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current page of results. |
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=head3 total_results |
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my $count = $result->total_results; |
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Returns the total number of results that News API has for the given |
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query parameters. |
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=head3 turn_page |
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$result->turn_page; |
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Increment the current page. |
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=head3 turn_page_back |
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$result->turn_page_back; |
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Decrement the current page, unless the current page number is already 1. |
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=head1 NOTES |
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Note that, due to the essential nature of News API, the size and |
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contents of a given article set can shift in between page-turns (or |
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page-size changes). |
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For example: Say that you create an article set through a call to |
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L<Web::NewsAPI/"top_articles">, and view the first page of results. If |
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you call L<"turn_page"> and list the articles again, there is a chance |
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that one or more articles towards the end of the first page's list now |
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lead the second page's list. This can occur when I<more news has |
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happened> in between the first page's query and the second, effectively |
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causing new entries at the top of the first page and pushing all the |
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older results down. |
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This sort of behavior occurs due to the nature of news, and software |
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using this module should be aware of it. |
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=head1 AUTHOR |
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Jason McIntosh (jmac@jmac.org) |
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