info.bliki.wiki.template.expr.ast.FractionNode Maven / Gradle / Ivy

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package info.bliki.wiki.template.expr.ast;

/**
 * A node for a parsed fraction string
 *
 */
public class FractionNode extends NumberNode {
    protected final IntegerNode fNumerator;

    protected final IntegerNode fDenominator;

    public FractionNode(final IntegerNode numerator, final IntegerNode denominator) {
        super(null);
        fNumerator = numerator;
        fDenominator = denominator;
    }

    public IntegerNode getDenominator() {
        return fDenominator;
    }

    public IntegerNode getNumerator() {
        return fNumerator;
    }

    @Override
    public String toString() {
        final StringBuffer buff = new StringBuffer();
        if (sign) {
            buff.append("-");
        }
        if (fNumerator != null) {
            buff.append(fNumerator.toString());
        }
        buff.append("/");
        if (fDenominator != null) {
            buff.append(fDenominator.toString());
        }
        return buff.toString();
    }

    @Override
    public double doubleValue() {
        double numer = Double.parseDouble(fNumerator.toString());
        double denom = Double.parseDouble(fDenominator.toString());
        if (sign) {
            return -1.0 * numer / denom;
        }
        return numer / denom;
    }

    @Override
    public boolean equals(Object obj) {
        if (obj instanceof FractionNode) {
            return fNumerator.equals(((FractionNode) obj).fNumerator) && fDenominator.equals(((FractionNode) obj).fDenominator)
                    && sign == ((FractionNode) obj).sign;
        }
        return false;
    }

    @Override
    public int hashCode() {
        if (sign) {
            return fNumerator.hashCode() + fDenominator.hashCode() * 17;
        }
        return fNumerator.hashCode() + fDenominator.hashCode();
    }
}