85 lines
2.7 KiB
Java
85 lines
2.7 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.DivisionRule
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*/
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import java.math.BigInteger;
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import java.util.LinkedList;
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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.Division;
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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.cavallium.warppi.util.Error;
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import it.cavallium.warppi.util.ScriptUtils;
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import it.unimi.dsi.fastutil.objects.ObjectArrayList;
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/**
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* Division
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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 DivisionRule 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 "Division";
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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 {
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if (f instanceof Division) {
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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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if (mathContext.exactMode) {
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if (((Number) variable1).isInteger() && ((Number) variable2).isInteger()) {
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LinkedList<BigInteger> factors1, factors2, mcm;
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try {
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factors1 = ((Number) variable1).getFactors();
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factors2 = ((Number) variable2).getFactors();
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mcm = ScriptUtils.mcm(factors1, factors2);
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} catch (final Exception ex) {
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return null;
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}
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if (mcm.size() > 0) { //true if there is at least one common factor
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//divide by the common factor (ab/cb = a/c)
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BigInteger nmb1 = ((Number) variable1).getTerm().toBigIntegerExact();
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BigInteger nmb2 = ((Number) variable2).getTerm().toBigIntegerExact();
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for (final BigInteger integerNumber : mcm) {
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nmb1 = nmb1.divide(integerNumber);
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nmb2 = nmb2.divide(integerNumber);
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}
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result.add(new Division(mathContext, new Number(mathContext, nmb1), new Number(mathContext, nmb2)));
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return result;
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}
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}
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} else {
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//divide a by b (a/b = c)
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result.add(((Number) variable1).divide((Number) variable2));
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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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