57 lines
1.6 KiB
Java
57 lines
1.6 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.SubtractionRule
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*/
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import it.cavallium.warppi.math.Function;
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import it.cavallium.warppi.math.FunctionOperator;
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import it.cavallium.warppi.math.MathContext;
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import it.cavallium.warppi.math.functions.Number;
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import it.cavallium.warppi.math.functions.Subtraction;
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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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* Subtraction
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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 SubtractionRule 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 "Subtraction";
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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 Subtraction) {
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final ObjectArrayList<Function> result = new ObjectArrayList<>();
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final Function variable1 = ((FunctionOperator) f).getParameter1();
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final Function variable2 = ((FunctionOperator) f).getParameter2();
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final MathContext mathContext = f.getMathContext();
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if (variable1 instanceof Number && variable2 instanceof Number) {
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//a-b = a+(b*-1) = c
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result.add(((Number) variable1).add(((Number) variable2).multiply(new Number(mathContext, -1))));
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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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