#include <Clause.h>
Collaboration diagram for libdap::Clause:
Public Member Functions | |
bool | boolean_clause () |
Return true if the clause returns a boolean value. | |
Clause () | |
Clause (btp_func func, rvalue_list *rv) | |
Clause (bool_func func, rvalue_list *rv) | |
Clause (const int oper, rvalue *a1, rvalue_list *rv) | |
bool | OK () |
Checks the "representation invariant" of a clause. | |
bool | value (DDS &dds, BaseType **value) |
Evaluate a clause that returns a value via a BaseType pointer. This method should be called only for those clauses that return values. | |
bool | value (DDS &dds) |
Evaluate a clause which returns a boolean value This method must only be evaluated for clauses with relational expressions or boolean functions. | |
bool | value_clause () |
Return true if the clause returns a value in a BaseType pointer. | |
virtual | ~Clause () |
Each clause object can contain a representation of one of three possible forms:
a > b
.
find(A,L)
might return TRUE if A is a member of L (if the find()
function is defined).
sig0()
might be included in the constraint expression parser to calculate density from pressure, temperature, and salinity. In this case, sig0(p,t,s)
would be a clause that evaluates to a data value.
This might be a bit confusing; in the first, and by far more common, form of constraint expressions (CEs) only the first two types of clauses may appear. In the second form of the CE only the last type of clause may occur. The Clause class, however, can store them all.
The Clause object holds the constraint expression after it has been parsed. The parser renders the relational operator into an integer, and the functions into pointers.
Definition at line 90 of file Clause.h.
libdap::Clause::Clause | ( | const int | oper, | |
rvalue * | a1, | |||
rvalue_list * | rv | |||
) |
libdap::Clause::Clause | ( | bool_func | func, | |
rvalue_list * | rv | |||
) |
libdap::Clause::Clause | ( | btp_func | func, | |
rvalue_list * | rv | |||
) |
bool libdap::Clause::boolean_clause | ( | ) |
bool libdap::Clause::OK | ( | ) |
Definition at line 107 of file Clause.cc.
Referenced by boolean_clause(), Clause(), value(), and value_clause().
dataset | This is passed to the function. | |
dds | Use variables from this DDS when evaluating the expression | |
value | A value-result parameter |
InternalErr | if called for a clause that returns a boolean value. Not that this method itself does return a boolean value. |
Definition at line 204 of file Clause.cc.
References libdap::build_btp_args(), OK(), and value().
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bool libdap::Clause::value | ( | DDS & | dds | ) |
dataset | This is passed to the rvalue::bvalue() method. | |
dds | Use variables from this DDS when evaluating the expression |
InternalErr | if called for a clause that returns a BaseType pointer. |
Definition at line 156 of file Clause.cc.
References libdap::build_btp_args(), libdap::rvalue::bvalue(), OK(), and libdap::BaseType::ops().
Referenced by libdap::ConstraintEvaluator::eval_function(), and value().
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bool libdap::Clause::value_clause | ( | ) |
Definition at line 139 of file Clause.cc.
References OK().
Referenced by libdap::ConstraintEvaluator::functional_expression().
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