// A class that holds ints for comparison purposes.
// (c) 1996 duane a. bailey
package structure;

public class ComparableInt implements Comparable
{
    protected Integer data; // where the integer is stored.

    public ComparableInt(int x)
    // post: construct an integer object that may be compared.
    {
        data = new Integer(x);
    }

    public boolean lessThan(Comparable other)
    // pre: other is a non-null ComparableInt
    // post: returns true iff the value of other is less than this
    {
        Assert.pre(other instanceof ComparableInt,
                   "lessThan expects a ComparableInt");
        ComparableInt that = (ComparableInt)other;
        return value() < that.value();
    }

    public boolean equals(Object other)
    // pre: other is a ComparableInt
    // post: returns true iff other is logically equal
    {
        Assert.pre(other instanceof ComparableInt,
                   "equals expects a ComparableInt");
        ComparableInt that = (ComparableInt)other;
        return value() == that.value();
        // alternatively:
        // return data.equals(otherInt.data);
    }

    public int hashCode()
    // post: return hashcode associated with underlying Integer.
    {
        return data.hashCode();
    }

    public String toString()
    // post: return string representation of the contained integer.
    {
        return data.toString();
    }

    public int value()
    // post: returns the value associated with this object
    {
        return data.intValue();
    }
}