Hello, I am in need of some assistance with this program.
I am needing to fill in the spaces marked as //TODO and am unsure how I go about it. Any help would be appreciated.
Also could someone please let me know if I've done the INSERTING RECORDS part correctly?
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public class EntityModel implements EntityModelInterface{
/**
* The model can only store up to MAX_RECORDS
*/
public static final int MAX_RECORDS = 10000;
/**
* The array storing the records
*/
protected Entity[] allRecords;
/**
* The number of records being stored
*/
protected int totalRecords;
/**
* The current record index. The main purpose of the class is to
* maintain this.
*/
protected int current;
/**
* A count of the number of records that have been marked for deletion
*/
protected int delRecCount;
// CONSTRUCTORS
/**
* Creates a EntityModel capable of storing <var>MAX_RECORDS</var> using
* an array
* <p>
* The current position is set to -1 (undefined).
* </p>
* <ul>
* <li>Creates the array</li>
* <li>Initialises the totalRecords to zero</li>
* <li>Initialises the delRecCount to zero</li>
* <li>Sets current to be -1</li>
* </ul>
*
*/
public EntityModel() {
allRecords = new Entity[MAX_RECORDS];
totalRecords = 0;
delRecCount = 0;
current = -1;
}
// STANDARD METHODS
public String toString() {
String result;
result = super.toString() + "["
+ " current=" + getCurrentRecordPosition()
+ ",delRecCount=" + getDelRecCount()
+ ",totalRecords=" + getTotalRecords()
+ ",entities= ";
for (int i = 0; i < getTotalRecords(); i++) {
result = result + this.allRecords[i] + ",";
}
result = result + "]";
return result;
}
public boolean equals(Object o) {
if (!(o instanceof EntityModel)) {
return false;
}
EntityModel sm = (EntityModel) o;
boolean same = false;
int i = 0;
while (i < this.getTotalRecords() && this.allRecords[i].equals(sm.allRecords[i])) {
i++;
}
same = (i == this.getTotalRecords());
return same;
}
// INSERTING RECORDS
public Entity add(Entity entity) {
current = current +1;
totalRecords = totalRecords+1;
allRecords[current] = entity;
entity.setId("current");
return entity;
}
// DELETE THE CURRENT RECORD
public Entity deleteCurrentRecord() {
//Current is usually moved to be the "next" record except if deleting the
// last record - see below.
// If it is a marked for deletion record then decrease the marked for
// deletion record count
//TODO //Get rid of the record from the array
//TODO //Adjust the total and current
// Case when deleting the last record. Set current to be the new last record.
//TODO // Return current but check if there are any records left. If not return null
//TODO return null; //remove or modify this line as needed
}