Have two classes and two corresponding lists:
class Click {
long campaignId;
Date date;
}
class Campaign {
long campaignId;
Date start;
Date end;
String type;
}
List<Click> clicks = ..;
List<Campaign> campaigns = ..;
And want to find all Clicks in clicks that:
Have a corresponding
Campaignincampaignslist, i.e.,Campaignwith the samecampaignIdANDThis
Campaignhastype= "prospective" ANDThis
Campaigns.start<click.date<Campaigns.end
So far I have the following implementation (which seems confusing and complex to me):
clicks.
stream().
filter(click -> campaigns.stream().anyMatch(
campaign -> campaign.getCampaignType().equals("prospecting") &&
campaign.getCampaignId().equals(click.getCampaignId()) &&
campaign.getStart().after(click.getDate()) &&
campaign.getEnd().before(click.getDate()))).
collect(toList());
I wonder if there is simpler solution for the problem.