85 lines
2.8 KiB
Java
85 lines
2.8 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.RootRule
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*/
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import java.math.BigDecimal;
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import java.math.BigInteger;
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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.Root;
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import it.cavallium.warppi.math.functions.RootSquare;
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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.cavallium.warppi.util.Error;
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import it.cavallium.warppi.util.Errors;
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import it.unimi.dsi.fastutil.objects.ObjectArrayList;
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/**
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* Root
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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 RootRule 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 "Root";
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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) throws Error, InterruptedException {
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boolean isSquare = false;
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if ((isSquare = f instanceof RootSquare) || f instanceof Root) {
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final ObjectArrayList<Function> result = new ObjectArrayList<>();
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final MathContext mathContext = f.getMathContext();
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final Function variable1 = ((FunctionOperator) f).getParameter1();
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final Function variable2 = ((FunctionOperator) f).getParameter2();
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boolean isSolvable = false, canBePorted = false;
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if (variable1 instanceof Number && variable2 instanceof Number) {
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if (mathContext.exactMode) {
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result.add(((Number) variable1).pow(new Number(mathContext, BigDecimal.ONE).divide((Number) variable1)));
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return result;
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}
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isSolvable = isSolvable | !mathContext.exactMode;
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if (!isSolvable)
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try {
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final Function resultVar = ((Number) variable2).pow(new Number(mathContext, BigDecimal.ONE).divide((Number) variable1));
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final Function originalVariable = ((Number) resultVar).pow(new Number(mathContext, 2));
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if (originalVariable.equals(((FunctionOperator) f).getParameter2()))
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isSolvable = true;
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} catch (final Exception ex) {
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throw (Error) new Error(Errors.ERROR, ex.getMessage()).initCause(ex);
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}
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}
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if (!isSquare && !isSolvable && variable1 instanceof Number && variable1.equals(new Number(mathContext, 2)))
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canBePorted = true;
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if (isSolvable) {
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result.add(((Number) variable2).pow(new Number(mathContext, BigInteger.ONE).divide((Number) variable1)));
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return result;
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}
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if (canBePorted)
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result.add(new RootSquare(mathContext, variable2));
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}
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return null;
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}
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}
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