62 lines
2.0 KiB
Java
62 lines
2.0 KiB
Java
package it.cavallium.warppi.math.rules.functions;
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/*
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SETTINGS: (please don't move this part)
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PATH=functions.MultiplicationRule
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*/
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import it.cavallium.warppi.math.Function;
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import it.cavallium.warppi.math.functions.Multiplication;
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import it.cavallium.warppi.math.functions.Number;
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import it.cavallium.warppi.math.rules.Rule;
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import it.cavallium.warppi.math.rules.RuleType;
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import it.unimi.dsi.fastutil.objects.ObjectArrayList;
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/**
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* Multiplication
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* a*b = c
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*
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* @author Andrea Cavalli
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*
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*/
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public class MultiplicationRule implements Rule {
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// Rule name
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@Override
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public String getRuleName() {
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return "Multiplication";
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}
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// Rule type
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@Override
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public RuleType getRuleType() {
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return RuleType.CALCULATION;
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}
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/* Rule function
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Returns:
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- null if it's not executable on the function "f"
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- An ObjectArrayList<Function> if it did something
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*/
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@Override
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public ObjectArrayList<Function> execute(final Function f) {
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if (f instanceof Multiplication) {
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final ObjectArrayList<Function> result = new ObjectArrayList<>();
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final Function variable1 = ((Multiplication) f).getParameter1();
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final Function variable2 = ((Multiplication) f).getParameter2();
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if (variable1 instanceof Number && variable2 instanceof Number) {
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//multiply a by b (a*b = c)
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result.add(((Number) variable1).multiply((Number) variable2));
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return result;
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} else if (!(variable1 instanceof Number) && variable2 instanceof Number) {
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//fix order: x*n -> n*x
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result.add(new Multiplication(f.getMathContext(), variable2, variable1));
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return result;
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} else if (!(variable1 instanceof Multiplication) && variable2 instanceof Multiplication) {
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//fix order: x*(y*z) -> (x*y)*z
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result.add(new Multiplication(f.getMathContext(), new Multiplication(f.getMathContext(), variable1, ((Multiplication) variable2).getParameter1()), ((Multiplication) variable2).getParameter2()));
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return result;
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}
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}
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return null;
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}
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}
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