TermConstant.cc

/* 
 * File:   TermConstant.cc
 * 
 * Copyright 2012 Heinrich Schuchardt <xypron.glpk@gmx.de>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "TermConstant.h"
#include "Problem.h"
#include <sstream>

TermConstant::TermConstant(Problem* problem, const double value) :
Term::Term(problem) {
    value_ = value;
}

TermConstant::~TermConstant() {
}

TermConstant* TermConstant::create(Problem* problem, const double value) throw
(ProblemMismatchException) {
    TermConstant* term = new TermConstant(problem, value);
    term = static_cast<TermConstant*> (problem->addTerm(term));
    return term;
}

Term* TermConstant::differentiate(TermVariable* variable) throw
(ProblemMismatchException) {
    return TermConstant::create(this->getProblem(), 0);
}

double TermConstant::evaluate() {
    return value_;
}

double TermConstant::eval(
        const DoubleVector* variableValues,
        TermValueSet* termValues) {
    return value_;
}

bool TermConstant::less(const Term* term) const {
    if (this->Term::less(term)) {
        return true;
    } else if (term->Term::less(this)) {
        return false;
    } else {
        const TermConstant* term_constant;
        term_constant = static_cast<const TermConstant*> (term);
        return this->value_ < term_constant->value_;
    }
}

std::string TermConstant::toString() const {
    std::ostringstream os;
    os << value_;
    return os.str();
};