69 lines
2.1 KiB
Java
69 lines
2.1 KiB
Java
package rules;
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/*
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SETTINGS: (please don't move this part)
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PATH=FractionsRule7
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*/
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import java.math.BigDecimal;
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import it.cavallium.warppi.math.Function;
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import it.cavallium.warppi.math.MathContext;
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import it.cavallium.warppi.math.functions.Division;
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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.functions.Power;
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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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* Number rule
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* a ^ -b = 1/(a^b)
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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 FractionsRule7 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 "FractionsRule7";
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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.EXPANSION;
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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 Power) {
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final MathContext root = f.getMathContext();
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final Power pow = (Power) f;
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if (pow.getParameter2() instanceof Number) {
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final Number numb = (Number) pow.getParameter2();
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if (numb.getTerm().compareTo(BigDecimal.ZERO) < 0) {
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final ObjectArrayList<Function> result = new ObjectArrayList<>();
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final Function a = new Division(root, new Number(root, 1), new Power(root, ((Power) f).getParameter1(), ((Number) ((Power) f).getParameter2()).multiply(new Number(root, -1))));
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result.add(a);
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return result;
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}
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} else if (pow.getParameter2() instanceof Multiplication && ((Multiplication) pow.getParameter2()).getParameter1().equals(new Number(root, -1))) {
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final ObjectArrayList<Function> result = new ObjectArrayList<>();
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final Function a = new Division(root, new Number(root, 1), new Power(root, ((Power) f).getParameter1(), ((Multiplication) ((Power) f).getParameter2()).getParameter2()));
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result.add(a);
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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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