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.\" ========================================================================
.\"
.IX Title "UR::Object::Iterator 3pm"
.TH UR::Object::Iterator 3pm "2016-10-31" "perl v5.24.1" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.SH "NAME"
UR::Object::Iterator \- API for iterating through objects matching a rule
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 5
\&  my $rule = UR::BoolExpr\->resolve(\*(AqSome::Class\*(Aq, foo => 1);
\&  my $iter = UR::Object::Iterator\->create_for_filter_rule($rule);
\&  while (my $obj = $iter\->next()) {
\&      print "Got an object: ",$obj\->id,"\en";
\&  }
\&
\&  # Equivalent
\&  my $iter2 = Some::Class\->create_iterator(foo => 1);
\&  while (my $obj = $iter2\->next()) {
\&      print "Got an object: ",$obj\->id,"\en";
\&  }
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fIget()\fR, implemented in UR::Object, is the usual way for retrieving sets of
objects matching particular properties.  When the result set of data is
large, it is often more efficient to use an iterator to access the data 
instead of getting it all in one list.
.PP
UR::Object implements \fIcreate_iterator()\fR, which is just a wrapper around
\&\fIcreate_for_filter_rule()\fR.
.PP
UR::Object::Iterator instances are normal Perl object references, not
UR-based objects.  They do not live in the Context's object cache, and
obey the normal Perl rules about scoping.
.SH "CONSTRUCTOR"
.IX Header "CONSTRUCTOR"
.IP "create_for_filter_rule" 4
.IX Item "create_for_filter_rule"
.Vb 1
\&  $iter = UR::Object::Iterator\->create_for_filter_rule($boolexpr);
.Ve
.Sp
Creates an iterator object based on the given BoolExpr (rule).  Under the
hood, it calls \fIget_objects_for_class_and_rule()\fR on the current Context
with the \f(CW$return_closure\fR flag set to true.
.SS "Methods inherited from UR::Iterator"
.IX Subsection "Methods inherited from UR::Iterator"
.IP "next" 4
.IX Item "next"
.PD 0
.IP "map" 4
.IX Item "map"
.IP "peek" 4
.IX Item "peek"
.IP "remaining" 4
.IX Item "remaining"
.PD
.SH "SEE ALSO"
.IX Header "SEE ALSO"
UR::Iterator, UR::Object, UR::Context