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package DataStructures.Heaps;
/**
* Class for heap elements.<br>
*
* <p>A heap element contains two attributes: a key which will be used to build the tree (int or
* double, either primitive type or object) and any kind of IMMUTABLE object the user sees fit to
* carry any information he/she likes. Be aware that the use of a mutable object might jeopardize
* the integrity of this information.
*
* @author Nicolas Renard
*/
public class HeapElement {
private final double key;
private final Object additionalInfo;
// Constructors
/**
* @param key : a number of primitive type 'double'
* @param info : any kind of IMMUTABLE object. May be null, since the purpose is only to carry
* additional information of use for the user
*/
public HeapElement(double key, Object info) {
this.key = key;
this.additionalInfo = info;
}
/**
* @param key : a number of primitive type 'int'
* @param info : any kind of IMMUTABLE object. May be null, since the purpose is only to carry
* additional information of use for the user
*/
public HeapElement(int key, Object info) {
this.key = key;
this.additionalInfo = info;
}
/**
* @param key : a number of object type 'Integer'
* @param info : any kind of IMMUTABLE object. May be null, since the purpose is only to carry
* additional information of use for the user
*/
public HeapElement(Integer key, Object info) {
this.key = key;
this.additionalInfo = info;
}
/**
* @param key : a number of object type 'Double'
* @param info : any kind of IMMUTABLE object. May be null, since the purpose is only to carry
* additional information of use for the user
*/
public HeapElement(Double key, Object info) {
this.key = key;
this.additionalInfo = info;
}
/** @param key : a number of primitive type 'double' */
public HeapElement(double key) {
this.key = key;
this.additionalInfo = null;
}
/** @param key : a number of primitive type 'int' */
public HeapElement(int key) {
this.key = key;
this.additionalInfo = null;
}
/** @param key : a number of object type 'Integer' */
public HeapElement(Integer key) {
this.key = key;
this.additionalInfo = null;
}
/** @param key : a number of object type 'Double' */
public HeapElement(Double key) {
this.key = key;
this.additionalInfo = null;
}
// Getters
/** @return the object containing the additional info provided by the user. */
public Object getInfo() {
return additionalInfo;
}
/** @return the key value of the element */
public double getKey() {
return key;
}
// Overridden object methods
public String toString() {
return "Key: " + key + " - " + additionalInfo.toString();
}
/**
* @param otherHeapElement
* @return true if the keys on both elements are identical and the additional info objects are
* identical.
*/
@Override
public boolean equals(Object o) {
if (o != null) {
if (!(o instanceof HeapElement)) return false;
HeapElement otherHeapElement = (HeapElement) o;
return (this.key == otherHeapElement.key)
&& (this.additionalInfo.equals(otherHeapElement.additionalInfo));
}
return false;
}
@Override
public int hashCode() {
int result = 0;
result = 31 * result + (int) key;
result = 31 * result + (additionalInfo != null ? additionalInfo.hashCode() : 0);
return result;
}
}