67 lines
2.0 KiB
Java
67 lines
2.0 KiB
Java
package rules;
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/*
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SETTINGS: (please don't move this part)
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PATH=ExpandRule5
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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.FunctionSingle;
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import it.cavallium.warppi.math.functions.Multiplication;
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import it.cavallium.warppi.math.functions.Negative;
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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.unimi.dsi.fastutil.objects.ObjectArrayList;
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/**
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* Expand rule
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* -(-a) = a
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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 ExpandRule5 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 "ExpandRule5";
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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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boolean isExecutable = false;
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if (f instanceof Negative)
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isExecutable = ((FunctionSingle) f).getParameter() instanceof Negative;
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else if (f instanceof Multiplication)
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if (((FunctionOperator) f).getParameter1().equals(new Number(f.getMathContext(), -1)) && ((FunctionOperator) f).getParameter2() instanceof Multiplication)
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isExecutable = ((FunctionOperator) ((FunctionOperator) f).getParameter2()).getParameter1().equals(((FunctionOperator) f).getParameter1());
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if (isExecutable) {
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final ObjectArrayList<Function> result = new ObjectArrayList<>();
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if (f instanceof Negative) {
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final Negative fnc = (Negative) f;
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result.add(((FunctionSingle) ((FunctionSingle) fnc.getParameter()).getParameter()).getParameter());
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} else if (f instanceof Multiplication) {
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final FunctionOperator fnc = (FunctionOperator) f;
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result.add(((FunctionOperator) fnc.getParameter2()).getParameter2());
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}
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return result;
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} else
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return null;
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}
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}
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