75 lines
2.1 KiB
Java
75 lines
2.1 KiB
Java
/*
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SETTINGS: (please don't move this part)
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PATH=functions.NegativeRule
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*/
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import org.warp.picalculator.math.Function;
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import org.warp.picalculator.math.FunctionOperator;
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import org.warp.picalculator.math.FunctionDynamic;
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import org.warp.picalculator.math.FunctionSingle;
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import org.warp.picalculator.math.MathContext;
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import it.unimi.dsi.fastutil.objects.ObjectArrayList;
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import org.warp.picalculator.ScriptUtils;
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import org.warp.picalculator.math.rules.Rule;
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import org.warp.picalculator.math.rules.RuleType;
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import org.warp.picalculator.math.rules.RulesManager;
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import org.warp.picalculator.math.functions.Number;
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import org.warp.picalculator.math.functions.Negative;
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import org.warp.picalculator.Error;
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import org.warp.picalculator.Errors;
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import java.lang.NullPointerException;
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import java.lang.NumberFormatException;
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import java.lang.ArithmeticException;
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/**
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* Negative
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* -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 NegativeRule 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 "Negative";
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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(Function f) throws Error {
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if (f instanceof Negative) {
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ObjectArrayList<Function> result = new ObjectArrayList<>();
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Function variable = ((Negative)f).getParameter();
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MathContext mathContext = f.getMathContext();
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if (variable instanceof Number) {
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//-a = a*-1 = b
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try {
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result.add(((Number)variable).multiply(new Number(mathContext, -1)));
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} catch (Exception ex) {
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if (ex instanceof NullPointerException) {
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throw new Error(Errors.ERROR);
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} else if (ex instanceof NumberFormatException) {
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throw new Error(Errors.SYNTAX_ERROR);
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} else if (ex instanceof ArithmeticException) {
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throw new Error(Errors.NUMBER_TOO_SMALL);
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}
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}
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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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