Clause.cc
// -*- mode: c++; c-basic-offset:4 -*-
// This file is part of libdap, A C++ implementation of the OPeNDAP Data
// Access Protocol.
// Copyright (c) 2002,2003 OPeNDAP, Inc.
// Author: James Gallagher <jgallagher@opendap.org>
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
//
// You can contact OPeNDAP, Inc. at PO Box 112, Saunderstown, RI. 02874-0112.
// (c) COPYRIGHT URI/MIT 1996,1998,1999
// Please first read the full copyright statement in the file COPYRIGHT_URI.
//
// Authors:
// jhrg,jimg James Gallagher <jgallagher@gso.uri.edu>
// Implementation for the CE Clause class.
#include "config.h"
#include <algorithm>
#include <cassert>
#include "Byte.h"
#include "Clause.h"
#include "DDS.h"
#include "Int16.h"
#include "Int32.h"
#include "UInt16.h"
#include "UInt32.h"
#include "expr.h"
using std::cerr;
using std::endl;
namespace libdap {
Clause::Clause(const int oper, rvalue *a1, rvalue_list *rv)
: _op(oper), _b_func(0), _bt_func(0), _argc(0), _arg1(a1), _args(rv) {
assert(OK());
}
#if 1
Clause::Clause(bool_func func, rvalue_list *rv) : _op(0), _b_func(func), _bt_func(0), _argc(0), _arg1(0), _args(rv) {
assert(OK());
if (_args) // account for null arg list
_argc = _args->size();
else
_argc = 0;
}
#endif
Clause::Clause(btp_func func, rvalue_list *rv) : _op(0), _b_func(0), _bt_func(func), _argc(0), _arg1(0), _args(rv) {
assert(OK());
if (_args)
_argc = _args->size();
else
_argc = 0;
}
Clause::Clause() : _op(0), _b_func(0), _bt_func(0), _argc(0), _arg1(0), _args(0) {}
static inline void delete_rvalue(rvalue *rv) {
delete rv;
rv = 0;
}
Clause::~Clause() {
if (_arg1) {
delete _arg1;
_arg1 = 0;
}
if (_args) {
// _args is a pointer to a vector<rvalue*> and we must must delete
// each rvalue pointer here explicitly. 02/03/04 jhrg
for_each(_args->begin(), _args->end(), delete_rvalue);
delete _args;
_args = 0;
}
}
bool Clause::OK() {
// Each clause object can contain one of: a relational clause, a boolean
// function clause or a BaseType pointer function clause. It must have a
// valid argument list.
//
// But, a valid arg list might contain zero arguments! 10/16/98 jhrg
bool relational = (_op && !_b_func && !_bt_func);
#if 1
bool boolean = (!_op && _b_func && !_bt_func);
#endif
bool basetype = (!_op && !_b_func && _bt_func);
if (relational)
return _arg1 && _args;
else if (boolean || basetype)
return true; // Until we check arguments...10/16/98 jhrg
else
return false;
}
bool Clause::boolean_clause() {
assert(OK());
return _op || _b_func;
}
bool Clause::value_clause() {
assert(OK());
return (_bt_func != 0);
}
bool Clause::value(DDS &dds) {
assert(OK());
assert(_op || _b_func);
if (_op) { // Is it a relational clause?
// rvalue::bvalue(...) returns the rvalue encapsulated in a
// BaseType *.
BaseType *btp = _arg1->bvalue(dds);
// The list of rvalues is an implicit logical OR, so assume
// FALSE and return TRUE for the first TRUE subclause.
bool result = false;
for (rvalue_list_iter i = _args->begin(); i != _args->end() && !result; i++) {
result = result || btp->ops((*i)->bvalue(dds), _op);
}
return result;
} else if (_b_func) { // ...A bool function?
BaseType **argv = build_btp_args(_args, dds);
bool result = false;
(*_b_func)(_argc, argv, dds, &result);
delete[] argv; // Cache me!
argv = 0;
return result;
} else {
throw InternalErr(__FILE__, __LINE__, "A selection expression must contain only boolean clauses.");
}
}
bool Clause::value(DDS &dds, BaseType **value) {
assert(OK());
assert(_bt_func);
if (_bt_func) {
// build_btp_args() is a function defined in RValue.cc. It no longer
// reads the values as it builds the arguments, that is now left up
// to the functions themselves. 9/25/06 jhrg
BaseType **argv = build_btp_args(_args, dds);
(*_bt_func)(_argc, argv, dds, value);
delete[] argv; // Cache me!
argv = 0;
if (*value) {
// FIXME This comment is likely wrong... 10/19/12
// This call to set_send_p was removed because new logic used
// in ResponseBuilder will handle it. See send_data(), ...
// When the second part of the CE is parsed, if it is null,
// then all the variables in the DDS that holds the function
// result variables will be sent. If there's a projection in
// that second CE, it will denote what is to be sent. Setting
// set_send_p(true) here had the affect of overriding that
// second CE. Note, however, that the code in send_data() clears
// all of the send_p properties for variables in the DDS, so
// removing the call here is just removing something that will
// actually have no affect. jhrg 10/19/12
(*value)->set_send_p(true);
(*value)->set_read_p(true);
return true;
} else {
return false;
}
} else {
throw InternalErr(__FILE__, __LINE__,
"Clause::value() was called in a context expecting a BaseType pointer return, but the Clause "
"was boolean-valued instead.");
}
}
} // namespace libdap
libdap::BaseType
The basic data type for the DODS DAP types.
Definition BaseType.h:118
libdap::BaseType::ops
virtual bool ops(BaseType *b, int op)
Evaluate relational operators.
Definition BaseType.cc:1101
libdap::BaseType::set_send_p
virtual void set_send_p(bool state)
Definition BaseType.cc:488
libdap::DDS
Definition DDS.h:176
libdap::InternalErr
A class for software fault reporting.
Definition InternalErr.h:61
libdap
top level DAP object to house generic methods
Definition AlarmHandler.h:35
libdap::build_btp_args
BaseType ** build_btp_args(const rvalue_list *args, DDS &dds)
Definition RValue.cc:82