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package org.json.junit.data;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.math.RoundingMode;
/**
* basic fraction class, no frills.
* @author John Aylward
*
*/
public class Fraction extends Number implements Comparable<Fraction> {
/**
* serial id.
*/
private static final long serialVersionUID = 1L;
/**
* value as a big decimal.
*/
private final BigDecimal bigDecimal;
/**
* value of the denominator.
*/
private final BigInteger denominator;
/**
* value of the numerator.
*/
private final BigInteger numerator;
/**
* @param numerator
* numerator
* @param denominator
* denominator
*/
public Fraction(final BigInteger numerator, final BigInteger denominator) {
super();
if (numerator == null || denominator == null) {
throw new IllegalArgumentException("All values must be non-null");
}
if (denominator.compareTo(BigInteger.ZERO)==0) {
throw new IllegalArgumentException("Divide by zero");
}
final BigInteger n;
final BigInteger d;
// normalize fraction
if (denominator.signum()<0) {
n = numerator.negate();
d = denominator.negate();
} else {
n = numerator;
d = denominator;
}
this.numerator = n;
this.denominator = d;
if (n.compareTo(BigInteger.ZERO)==0) {
this.bigDecimal = BigDecimal.ZERO;
} else if (n.compareTo(d)==0) {// i.e. 4/4, 10/10
this.bigDecimal = BigDecimal.ONE;
} else {
this.bigDecimal = new BigDecimal(this.numerator).divide(new BigDecimal(this.denominator),
RoundingMode.HALF_EVEN);
}
}
/**
* @param numerator
* numerator
* @param denominator
* denominator
*/
public Fraction(final long numerator, final long denominator) {
this(BigInteger.valueOf(numerator),BigInteger.valueOf(denominator));
}
/**
* @return the decimal
*/
public BigDecimal bigDecimalValue() {
return this.bigDecimal;
}
@Override
public int compareTo(final Fraction o) {
// .equals call this, so no .equals compare allowed
// if they are the same reference, just return equals
if (this == o) {
return 0;
}
// if my denominators are already equal, just compare the numerators
if (this.denominator.compareTo(o.denominator)==0) {
return this.numerator.compareTo(o.numerator);
}
// get numerators of common denominators
// a x ay xb
// --- --- = ---- ----
// b y by yb
final BigInteger thisN = this.numerator.multiply(o.denominator);
final BigInteger otherN = o.numerator.multiply(this.denominator);
return thisN.compareTo(otherN);
}
@Override
public double doubleValue() {
return this.bigDecimal.doubleValue();
}
/**
* @see java.lang.Object#equals(java.lang.Object)
*/
@Override
public boolean equals(final Object obj) {
if (this == obj) {
return true;
}
if (obj == null) {
return false;
}
if (this.getClass() != obj.getClass()) {
return false;
}
final Fraction other = (Fraction) obj;
return this.compareTo(other) == 0;
}
@Override
public float floatValue() {
return this.bigDecimal.floatValue();
}
/**
* @return the denominator
*/
public BigInteger getDenominator() {
return this.denominator;
}
/**
* @return the numerator
*/
public BigInteger getNumerator() {
return this.numerator;
}
/**
* @see java.lang.Object#hashCode()
*/
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + (this.bigDecimal == null ? 0 : this.bigDecimal.hashCode());
return result;
}
@Override
public int intValue() {
return this.bigDecimal.intValue();
}
@Override
public long longValue() {
return this.bigDecimal.longValue();
}
/**
* @see java.lang.Object#toString()
*/
@Override
public String toString() {
return this.numerator + "/" + this.denominator;
}
}