/**
* Sells a specified number of records Throws an exception if the record doesn't exist in the
* store or if trying to sell more records than exist in the inventory
*
* @param record - the record to sell
* @param quantity - the number of records to sell
*/
public void sellItem(AudioFormat record, int quantity)
throws NullPointerException, IllegalArgumentException {
// System.out.println("Selling: " + record.toString() + ", quantity: " + quantity);
InventoryItem item = null;
for (int i = 0; i < this.listOfItems.length; i++) {
item = this.listOfItems[i];
// If it finds the record, break out of the loop
if (record.equals(item.getRecord())) {
break;
}
}
// Handle the record not being in the inventory
if (item == null) {
throw new NullPointerException(
"Error: there is no record of this type in stock "
+ "(record does not exist within the array).");
}
// Handle selling more items than the store has
if (item.getQuantity() - quantity < 0) {
throw new IllegalArgumentException(
"Error: you cannot sell more records than you have "
+ "(# of records sold makes quantity smaller than 0).");
}
item.setQuantity(item.getQuantity() - quantity);
}
/**
* Writes the contents of listOfItems to the file at the specified path Precondition - the file
* must already exist
*
* @param path - the file to write to
*/
public void writeToFile(String path) {
PrintWriter writer = null;
try {
writer = new PrintWriter(path);
// Iterates through every item in the store
for (InventoryItem item : this.listOfItems) {
DecimalFormat decimalFormat = new DecimalFormat("#0.00");
// Uses StringBuilder instead of String concatenation to save memory in the loop
StringBuilder stringBuilder = new StringBuilder();
stringBuilder.append(item.getRecord().toString());
stringBuilder.append(",");
stringBuilder.append(item.getQuantity());
stringBuilder.append(",");
// Ensures that the price has only two decimal places
stringBuilder.append(decimalFormat.format(item.getPrice()));
stringBuilder.append("\n");
writer.write(stringBuilder.toString());
}
} catch (FileNotFoundException e) {
System.out.println("Error transcribing output.");
e.printStackTrace();
} finally {
writer.close();
}
}
/**
* Adds a specified number of records to the inventory and updates the price
*
* @param record - the record to add
* @param quantity - the number of records to add
* @param price - the price to sell the record at
*/
public void addItem(AudioFormat record, int quantity, double price) {
// System.out.println("Adding: " + record.toString() + ", quantity: " + quantity + ", price: " +
// price);
for (int i = 0; i < this.listOfItems.length; i++) {
InventoryItem item = this.listOfItems[i];
// If the record is found, set the price and add the quantity and end the method
if (record.equals(item.getRecord())) {
item.setPrice(price);
item.setQuantity(item.getQuantity() + quantity);
return;
}
}
// If it's an entirely new record, duplicates the old array and increases its size by 1
InventoryItem[] temp = new InventoryItem[this.listOfItems.length + 1];
for (int i = 0; i < this.listOfItems.length; i++) {
temp[i] = this.listOfItems[i];
}
this.listOfItems = temp;
// Adds the new record to the end of the array
this.listOfItems[this.listOfItems.length - 1] = new InventoryItem(record, quantity, price);
}