Adds tests for numbers

src/test/java/org/json/junit/Fraction.java

@@ -0,0 +1,180 @@
+package org.json.junit;
+
+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;
+    }
+}