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‎src/javacalculus/evaluator/CalcFACTORIAL.java

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/**
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*
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*/
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package javacalculus.evaluator;
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import javacalculus.core.CALC;
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import javacalculus.evaluator.extend.Calc1ParamFunctionEvaluator;
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import javacalculus.evaluator.extend.CalcOperatorEvaluator;
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import javacalculus.struct.CalcDouble;
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import javacalculus.struct.CalcFraction;
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import javacalculus.struct.CalcFunction;
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import javacalculus.struct.CalcInteger;
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import javacalculus.struct.CalcObject;
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import javacalculus.struct.CalcSymbol;
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/**
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* Factorial evaluator (x! = x*(x-1)*(x-2)*...*1). Supports negative numbers.
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* @author Duyun Chen <A HREF="mailto:[email protected]">[[email protected]]</A>,
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* Seth Shannin <A HREF="mailto:[email protected]">[[email protected]]</A>
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*
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*
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*/
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public class CalcFACTORIAL extends Calc1ParamFunctionEvaluator implements CalcOperatorEvaluator {
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@Override
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protected CalcObject evaluateObject(CalcObject input) {
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return null;
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}
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@Override
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protected CalcObject evaluateDouble(CalcDouble input) {
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//use the generalized function GAMMA to evaluate doubles and fractions
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return CALC.GAMMA.createFunction(input.add(CALC.D_ONE));
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}
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@Override
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protected CalcObject evaluateFraction(CalcFraction input) {
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return CALC.GAMMA.createFunction(input.add(new CalcFraction(CALC.ONE, CALC.ONE)));
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}
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@Override
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protected CalcObject evaluateFunction(CalcFunction input) {
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return CALC.FACTORIAL.createFunction(input);
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}
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@Override
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protected CalcObject evaluateInteger(CalcInteger input) {
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return factorial(input);
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}
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@Override
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protected CalcObject evaluateSymbol(CalcSymbol input) {
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//cannot evaluate symbols, so just return the original function
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return CALC.FACTORIAL.createFunction(input);
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}
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public CalcInteger factorial(CalcInteger input) {
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CalcInteger result = CALC.ONE;
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if (input.isNegative()) {
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result = CALC.NEG_ONE;
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for (CalcInteger ii = CALC.NEG_TWO; ii.compareTo(input) >= 0; ii = ii.add(CALC.NEG_ONE)) {
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result = result.multiply(ii);
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}
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}
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else {
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for (CalcInteger ii = CALC.TWO; ii.compareTo(input) <= 0; ii = ii.add(CALC.ONE)) {
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result = result.multiply(ii);
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}
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}
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return result;
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}
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@Override
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public int getPrecedence() {
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return 700;
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}
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@Override
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public String toOperatorString(CalcFunction function) {
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StringBuffer buffer = new StringBuffer();
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char operatorChar = '!';
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CalcObject temp = function.get(0);
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if (temp.getPrecedence() < getPrecedence()) {
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buffer.append('(');
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}
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buffer.append(temp.toString());
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if (temp.getPrecedence() < getPrecedence()) {
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buffer.append(')');
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}
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buffer.append(operatorChar);
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return buffer.toString();
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}
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}
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/**
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*
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*/
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package javacalculus.evaluator;
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import javacalculus.core.CALC;
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import javacalculus.evaluator.extend.Calc1ParamFunctionEvaluator;
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import javacalculus.evaluator.extend.CalcOperatorEvaluator;
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import javacalculus.struct.CalcDouble;
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import javacalculus.struct.CalcFraction;
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import javacalculus.struct.CalcFunction;
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import javacalculus.struct.CalcInteger;
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import javacalculus.struct.CalcObject;
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import javacalculus.struct.CalcSymbol;
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/**
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* Factorial evaluator (x! = x*(x-1)*(x-2)*...*1). Supports negative numbers.
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* @author Duyun Chen <A HREF="mailto:[email protected]">[[email protected]]</A>,
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* Seth Shannin <A HREF="mailto:[email protected]">[[email protected]]</A>
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*
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*
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*/
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public class CalcFACTORIAL extends Calc1ParamFunctionEvaluator implements CalcOperatorEvaluator {
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@Override
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protected CalcObject evaluateObject(CalcObject input) {
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return null;
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}
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@Override
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protected CalcObject evaluateDouble(CalcDouble input) {
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//use the generalized function GAMMA to evaluate doubles and fractions
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return CALC.GAMMA.createFunction(input.add(CALC.D_ONE));
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}
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@Override
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protected CalcObject evaluateFraction(CalcFraction input) {
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return CALC.GAMMA.createFunction(input.add(new CalcFraction(CALC.ONE, CALC.ONE)));
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}
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@Override
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protected CalcObject evaluateFunction(CalcFunction input) {
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return CALC.FACTORIAL.createFunction(input);
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}
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@Override
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protected CalcObject evaluateInteger(CalcInteger input) {
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return factorial(input);
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}
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@Override
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protected CalcObject evaluateSymbol(CalcSymbol input) {
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//cannot evaluate symbols, so just return the original function
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if (input.equals(CALC.ERROR)) {
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return CALC.ERROR;
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}
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return CALC.FACTORIAL.createFunction(input);
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}
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public CalcInteger factorial(CalcInteger input) {
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CalcInteger result = CALC.ONE;
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if (input.isNegative()) {
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result = CALC.NEG_ONE;
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for (CalcInteger ii = CALC.NEG_TWO; ii.compareTo(input) >= 0; ii = ii.add(CALC.NEG_ONE)) {
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result = result.multiply(ii);
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}
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}
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else {
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for (CalcInteger ii = CALC.TWO; ii.compareTo(input) <= 0; ii = ii.add(CALC.ONE)) {
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result = result.multiply(ii);
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}
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}
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return result;
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}
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@Override
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public int getPrecedence() {
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return 700;
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}
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@Override
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public String toOperatorString(CalcFunction function) {
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StringBuffer buffer = new StringBuffer();
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char operatorChar = '!';
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CalcObject temp = function.get(0);
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if (temp.getPrecedence() < getPrecedence()) {
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buffer.append('(');
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}
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buffer.append(temp.toString());
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if (temp.getPrecedence() < getPrecedence()) {
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buffer.append(')');
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}
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buffer.append(operatorChar);
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return buffer.toString();
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}
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}

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