I wrote a Triplet class, it seems general purpose enough to share, so here it is:
package harsch.sandbox;
import org.apache.commons.lang.builder.CompareToBuilder;
import org.apache.commons.lang.builder.HashCodeBuilder;
/**
*
* @author Tim Harsch
*
* @param <L>
* @param <M>
* @param <R>
*/
public class Triplet<L, M, R> implements Comparable<Object> {
private final L left;
private final M mid;
private final R right;
public R getRight() {
return right;
} // end getter
public M getMid() {
return mid;
} // end getter
public L getLeft() {
return left;
} // end getter
public Triplet(final L left, final M mid, final R right) {
this.left = left;
this.mid = mid;
this.right = right;
} // end constructor
public static <A, B, C> Triplet<A, B, C> create(A left, B mid, C right) {
return new Triplet<A, B, C>(left, mid, right);
} // end factory method
@Override
public final boolean equals(Object o) {
if (!(o instanceof Triplet<?, ?, ?>))
return false;
final Triplet<?, ?, ?> other = (Triplet<?, ?, ?>) o;
return equal(getLeft(), other.getLeft())
&& equal(getMid(), other.getMid())
&& equal(getRight(), other.getRight());
} // end method
public static final boolean equal(Object o1, Object o2) {
if (o1 == null) {
return o2 == null;
}
return o1.equals(o2);
} // end method
@Override
public int hashCode() {
return new HashCodeBuilder(17, 13).append(this.left).append(this.mid)
.append(this.right).toHashCode();
} // end method
@Override
public int compareTo(Object o) {
Triplet<?, ?, ?> other = (Triplet<?, ?, ?>) o;
return new CompareToBuilder().append(this.left, other.left).append(
this.mid, other.mid).append(this.right, other.right)
.toComparison();
} // end method
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
sb.append('<');
if (left == null) {
sb.append("null");
} else {
sb.append(left.toString());
} // end if
sb.append(',');
if (mid == null) {
sb.append("null");
} else {
sb.append(mid.toString());
} // end if
sb.append(',');
if (right == null) {
sb.append("null");
} else {
sb.append(right.toString());
} // end if
sb.append('>');
return sb.toString();
} // end method
} // end class
