TermVariable.cc

/* 
 * File:   TermVariable.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 "TermVariable.h"
#include "TermConstant.h"
#include "Problem.h"
#include <limits>

TermVariable::TermVariable(Problem* problem, const std::string &name) :
Term::Term(problem) {
    name_ = std::string(name);
    lowerBound_ = std::numeric_limits<double>::min();
    upperBound_ = std::numeric_limits<double>::max();
}

TermVariable::~TermVariable() {
}

bool TermVariable::less(const Term* term) const {
    bool ret;
    if (this->Term::less(term)) {
        return true;
    } else if (term->Term::less(this)) {
        return false;
    } else {
        const TermVariable* term_variable;
        term_variable = static_cast<const TermVariable *> (term);
        ret = this->name_.compare(term_variable->name_) < 0;
    }
    return ret;
}

TermVariable* TermVariable::create(Problem* problem, const std::string &name) {
    TermVariable* variable = new TermVariable(problem, name);
    variable = static_cast<TermVariable *> (problem->addVariable(variable));
    return variable;
}

Term* TermVariable::differentiate(TermVariable* variable) throw
(ProblemMismatchException) {
    if (this->getProblem() != variable->getProblem()) {
        ProblemMismatchException problem_mismatch_exception;
        throw problem_mismatch_exception;
    }
    if (this->name_ == variable->name_) {
        return TermConstant::create(this->getProblem(), 1.);
    } else {
        return TermConstant::create(this->getProblem(), 0.);
    }
}

double TermVariable::eval(
        const DoubleVector* variableValues,
        TermValueSet* termValues) {
    return (*variableValues)[this->variableIndex_];
}

const int TermVariable::getVariableIndex() {
    return variableIndex_;
}

void TermVariable::setVariableIndex(const int variableIndex) {
    variableIndex_ = variableIndex;
}

const double TermVariable::getLowerBound() {
    return lowerBound_;
}

void TermVariable::setLowerBound(const double lowerBound) {
    lowerBound_ = lowerBound;
}

const std::string TermVariable::getName() {
    return name_;
}

const double TermVariable::getUpperBound() {
    return upperBound_;
}

void TermVariable::setUpperBound(const double upperBound) {
    upperBound_ = upperBound;
}

std::string TermVariable::toString() const {
    return name_;
};