411 lines
13 KiB
Java
411 lines
13 KiB
Java
package no.birkett.kiwi;
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import java.util.ArrayList;
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import java.util.List;
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/**
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* Created by alex on 31/01/15.
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*/
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public class Symbolics {
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private Symbolics() {
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}
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// Variable multiply, divide, and unary invert
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public static Term multiply(Variable variable, double coefficient) {
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return new Term(variable, coefficient);
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}
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public static Term divide(Variable variable, double denominator) {
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return multiply(variable, (1.0 / denominator));
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}
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public static Term negate(Variable variable) {
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return multiply(variable, -1.0);
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}
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// Term multiply, divide, and unary invert
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public static Term multiply(Term term, double coefficient) {
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return new Term(term.getVariable(), term.getCoefficient() * coefficient);
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}
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public static Term divide(Term term, double denominator) {
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return multiply(term, (1.0 / denominator));
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}
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public static Term negate(Term term) {
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return multiply(term, -1.0);
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}
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// Expression multiply, divide, and unary invert
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public static Expression multiply(Expression expression, double coefficient) {
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List<Term> terms = new ArrayList<Term>();
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for (Term term : expression.getTerms()) {
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terms.add(multiply(term, coefficient));
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}
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// TODO Do we need to make a copy of the term objects in the array?
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return new Expression(terms, expression.getConstant() * coefficient);
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}
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public static Expression divide(Expression expression, double denominator) {
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return multiply(expression, (1.0 / denominator));
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}
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public static Expression negate(Expression expression) {
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return multiply(expression, -1.0);
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}
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// Double multiply
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public static Expression multiply(double coefficient, Expression expression) {
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return multiply(expression, coefficient);
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}
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public static Term multiply(double coefficient, Term term) {
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return multiply(term, coefficient);
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}
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public static Term multiply(double coefficient, Variable variable) {
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return multiply(variable, coefficient);
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}
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// Expression add and subtract
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public static Expression add(Expression first, Expression second) {
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//TODO do we need to copy term objects?
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List<Term> terms = new ArrayList<Term>(first.getTerms().size() + second.getTerms().size());
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terms.addAll(first.getTerms());
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terms.addAll(second.getTerms());
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return new Expression(terms, first.getConstant() + second.getConstant());
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}
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public static Expression add(Expression first, Term second) {
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//TODO do we need to copy term objects?
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List<Term> terms = new ArrayList<Term>(first.getTerms().size() + 1);
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terms.addAll(first.getTerms());
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terms.add(second);
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return new Expression(terms, first.getConstant());
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}
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public static Expression add(Expression expression, Variable variable) {
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return add(expression, new Term(variable));
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}
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public static Expression add(Expression expression, double constant) {
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return new Expression(expression.getTerms(), expression.getConstant() + constant);
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}
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public static Expression subtract(Expression first, Expression second) {
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return add(first, negate(second));
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}
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public static Expression subtract(Expression expression, Term term) {
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return add(expression, negate(term));
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}
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public static Expression subtract(Expression expression, Variable variable) {
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return add(expression, negate(variable));
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}
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public static Expression subtract(Expression expression, double constant) {
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return add(expression, -constant);
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}
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// Term add and subtract
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public static Expression add(Term term, Expression expression) {
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return add(expression, term);
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}
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public static Expression add(Term first, Term second) {
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List<Term> terms = new ArrayList<Term>(2);
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terms.add(first);
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terms.add(second);
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return new Expression(terms);
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}
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public static Expression add(Term term, Variable variable) {
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return add(term, new Term(variable));
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}
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public static Expression add(Term term, double constant) {
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return new Expression(term, constant);
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}
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public static Expression subtract(Term term, Expression expression) {
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return add(negate(expression), term);
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}
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public static Expression subtract(Term first, Term second) {
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return add(first, negate(second));
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}
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public static Expression subtract(Term term, Variable variable) {
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return add(term, negate(variable));
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}
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public static Expression subtract(Term term, double constant) {
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return add(term, -constant);
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}
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// Variable add and subtract
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public static Expression add(Variable variable, Expression expression) {
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return add(expression, variable);
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}
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public static Expression add(Variable variable, Term term) {
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return add(term, variable);
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}
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public static Expression add(Variable first, Variable second) {
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return add(new Term(first), second);
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}
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public static Expression add(Variable variable, double constant) {
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return add(new Term(variable), constant);
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}
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public static Expression subtract(Variable variable, Expression expression) {
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return add(variable, negate(expression));
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}
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public static Expression subtract(Variable variable, Term term) {
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return add(variable, negate(term));
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}
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public static Expression subtract(Variable first, Variable second) {
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return add(first, negate(second));
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}
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public static Expression subtract(Variable variable, double constant) {
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return add(variable, -constant);
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}
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// Double add and subtract
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public static Expression add(double constant, Expression expression) {
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return add(expression, constant);
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}
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public static Expression add(double constant, Term term) {
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return add(term, constant);
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}
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public static Expression add(double constant, Variable variable) {
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return add(variable, constant);
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}
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public static Expression subtract(double constant, Expression expression) {
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return add(negate(expression), constant);
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}
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public static Expression subtract(double constant, Term term) {
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return add(negate(term), constant);
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}
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public static Expression subtract(double constant, Variable variable) {
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return add(negate(variable), constant);
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}
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// Expression relations
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public static Constraint equals(Expression first, Expression second) {
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return new Constraint(subtract(first, second), RelationalOperator.OP_EQ);
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}
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public static Constraint equals(Expression expression, Term term) {
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return equals(expression, new Expression(term));
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}
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public static Constraint equals(Expression expression, Variable variable) {
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return equals(expression, new Term(variable));
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}
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public static Constraint equals(Expression expression, double constant) {
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return equals(expression, new Expression(constant));
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}
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public static Constraint lessThanOrEqualTo(Expression first, Expression second) {
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return new Constraint(subtract(first, second), RelationalOperator.OP_LE);
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}
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public static Constraint lessThanOrEqualTo(Expression expression, Term term) {
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return lessThanOrEqualTo(expression, new Expression(term));
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}
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public static Constraint lessThanOrEqualTo(Expression expression, Variable variable) {
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return lessThanOrEqualTo(expression, new Term(variable));
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}
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public static Constraint lessThanOrEqualTo(Expression expression, double constant) {
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return lessThanOrEqualTo(expression, new Expression(constant));
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}
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public static Constraint greaterThanOrEqualTo(Expression first, Expression second) {
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return new Constraint(subtract(first, second), RelationalOperator.OP_GE);
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}
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public static Constraint greaterThanOrEqualTo(Expression expression, Term term) {
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return greaterThanOrEqualTo(expression, new Expression(term));
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}
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public static Constraint greaterThanOrEqualTo(Expression expression, Variable variable) {
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return greaterThanOrEqualTo(expression, new Term(variable));
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}
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public static Constraint greaterThanOrEqualTo(Expression expression, double constant) {
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return greaterThanOrEqualTo(expression, new Expression(constant));
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}
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// Term relations
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public static Constraint equals(Term term, Expression expression) {
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return equals(expression, term);
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}
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public static Constraint equals(Term first, Term second) {
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return equals(new Expression(first), second);
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}
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public static Constraint equals(Term term, Variable variable) {
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return equals(new Expression(term), variable);
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}
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public static Constraint equals(Term term, double constant) {
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return equals(new Expression(term), constant);
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}
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public static Constraint lessThanOrEqualTo(Term term, Expression expression) {
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return lessThanOrEqualTo(expression, term);
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}
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public static Constraint lessThanOrEqualTo(Term first, Term second) {
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return lessThanOrEqualTo(new Expression(first), second);
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}
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public static Constraint lessThanOrEqualTo(Term term, Variable variable) {
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return lessThanOrEqualTo(new Expression(term), variable);
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}
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public static Constraint lessThanOrEqualTo(Term term, double constant) {
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return lessThanOrEqualTo(new Expression(term), constant);
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}
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public static Constraint greaterThanOrEqualTo(Term term, Expression expression) {
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return greaterThanOrEqualTo(expression, term);
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}
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public static Constraint greaterThanOrEqualTo(Term first, Term second) {
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return greaterThanOrEqualTo(new Expression(first), second);
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}
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public static Constraint greaterThanOrEqualTo(Term term, Variable variable) {
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return greaterThanOrEqualTo(new Expression(term), variable);
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}
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public static Constraint greaterThanOrEqualTo(Term term, double constant) {
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return greaterThanOrEqualTo(new Expression(term), constant);
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}
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// Variable relations
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public static Constraint equals(Variable variable, Expression expression) {
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return equals(expression, variable);
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}
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public static Constraint equals(Variable variable, Term term) {
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return equals(term, variable);
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}
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public static Constraint equals(Variable first, Variable second) {
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return equals(new Term(first), second);
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}
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public static Constraint equals(Variable variable, double constant) {
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return equals(new Term(variable), constant);
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}
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public static Constraint lessThanOrEqualTo(Variable variable, Expression expression) {
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return lessThanOrEqualTo(expression, variable);
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}
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public static Constraint lessThanOrEqualTo(Variable variable, Term term) {
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return lessThanOrEqualTo(term, variable);
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}
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public static Constraint lessThanOrEqualTo(Variable first, Variable second) {
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return lessThanOrEqualTo(new Term(first), second);
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}
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public static Constraint lessThanOrEqualTo(Variable variable, double constant) {
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return lessThanOrEqualTo(new Term(variable), constant);
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}
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public static Constraint greaterThanOrEqualTo(Variable variable, Expression expression) {
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return greaterThanOrEqualTo(expression, variable);
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}
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public static Constraint greaterThanOrEqualTo(Variable variable, Term term) {
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return greaterThanOrEqualTo(term, variable);
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}
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public static Constraint greaterThanOrEqualTo(Variable first, Variable second) {
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return greaterThanOrEqualTo(new Term(first), second);
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}
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public static Constraint greaterThanOrEqualTo(Variable variable, double constant) {
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return greaterThanOrEqualTo(new Term(variable), constant);
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}
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// Double relations
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public static Constraint equals(double constant, Expression expression) {
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return equals(expression, constant);
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}
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public static Constraint equals(double constant, Term term) {
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return equals(term, constant);
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}
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public static Constraint equals(double constant, Variable variable) {
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return equals(variable, constant);
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}
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public static Constraint lessThanOrEqualTo(double constant, Expression expression) {
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return lessThanOrEqualTo(expression, constant);
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}
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public static Constraint lessThanOrEqualTo(double constant, Term term) {
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return lessThanOrEqualTo(term, constant);
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}
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public static Constraint lessThanOrEqualTo(double constant, Variable variable) {
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return lessThanOrEqualTo(variable, constant);
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}
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public static Constraint greaterThanOrEqualTo(double constant, Expression expression) {
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return greaterThanOrEqualTo(expression, constant);
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}
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public static Constraint greaterThanOrEqualTo(double constant, Term term) {
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return greaterThanOrEqualTo(term, constant);
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}
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public static Constraint greaterThanOrEqualTo(double constant, Variable variable) {
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return greaterThanOrEqualTo(variable, constant);
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}
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// Constraint strength modifier
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public static Constraint modifyStrength(Constraint constraint, double strength) {
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return new Constraint(constraint, strength);
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}
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public static Constraint modifyStrength(double strength, Constraint constraint) {
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return modifyStrength(strength, constraint);
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}
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}
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