package warehouse;

/\*
 \*
 \* This class implements a warehouse on a Hash Table like structure, 
 \* where each entry of the table stores a priority queue. 
 \* Due to your limited space, you are unable to simply rehash to get more space. 
 \* However, you can use your priority queue structure to delete less popular items 
 \* and keep the space constant.
 \* 
 \* @author Ishaan Ivaturi
 \*/ 
public class Warehouse {
 private Sector[] sectors;
 
 // Initializes every sector to an empty sector
 public Warehouse() {
 sectors = new Sector[10];

 for (int i = 0; i < 10; i++) {
 sectors[i] = new Sector();
 }
 }
 
 /\*\*
 \* Provided method, code the parts to add their behavior
 \* @param id The id of the item to add
 \* @param name The name of the item to add
 \* @param stock The stock of the item to add
 \* @param day The day of the item to add
 \* @param demand Initial demand of the item to add
 \*/
 public void addProduct(int id, String name, int stock, int day, int demand) {
 evictIfNeeded(id);
 addToEnd(id, name, stock, day, demand);
 fixHeap(id);
 }

 /\*\*
 \* Add a new product to the end of the correct sector
 \* Requires proper use of the .add() method in the Sector class
 \* @param id The id of the item to add
 \* @param name The name of the item to add
 \* @param stock The stock of the item to add
 \* @param day The day of the item to add
 \* @param demand Initial demand of the item to add
 \*/
 private void addToEnd(int id, String name, int stock, int day, int demand) {
 // IMPLEMENT THIS METHOD
 }

 /\*\*
 \* Fix the heap structure of the sector, assuming the item was already added
 \* Requires proper use of the .swim() and .getSize() methods in the Sector class
 \* @param id The id of the item which was added
 \*/
 private void fixHeap(int id) {
 // IMPLEMENT THIS METHOD
 }

 /\*\*
 \* Delete the least popular item in the correct sector, only if its size is 5 while maintaining heap
 \* Requires proper use of the .swap(), .deleteLast(), and .sink() methods in the Sector class
 \* @param id The id of the item which is about to be added
 \*/
 private void evictIfNeeded(int id) {
 // IMPLEMENT THIS METHOD
 }

 /\*\*
 \* Update the stock of some item by some amount
 \* Requires proper use of the .getSize() and .get() methods in the Sector class
 \* Requires proper use of the .updateStock() method in the Product class
 \* @param id The id of the item to restock
 \* @param amount The amount by which to update the stock
 \*/
 public void restockProduct(int id, int amount) {
 // IMPLEMENT THIS METHOD
 }
 
 /\*\*
 \* Delete some arbitrary product while maintaining the heap structure in O(logn)
 \* Requires proper use of the .getSize(), .get(), .swap(), .deleteLast(), .sink() and/or .swim() methods
 \* Requires proper use of the .getId() method from the Product class
 \* @param id The id of the product to delete
 \*/
 public void deleteProduct(int id) {
 // IMPLEMENT THIS METHOD
 }
 
 /\*\*
 \* Simulate a purchase order for some product
 \* Requires proper use of the getSize(), sink(), get() methods in the Sector class
 \* Requires proper use of the getId(), getStock(), setLastPurchaseDay(), updateStock(), updateDemand() methods
 \* @param id The id of the purchased product
 \* @param day The current day
 \* @param amount The amount purchased
 \*/
 public void purchaseProduct(int id, int day, int amount) {
 // IMPLEMENT THIS METHOD
 }
 
 /\*\*
 \* Construct a better scheme to add a product, where empty spaces are always filled
 \* @param id The id of the item to add
 \* @param name The name of the item to add
 \* @param stock The stock of the item to add
 \* @param day The day of the item to add
 \* @param demand Initial demand of the item to add
 \*/
 public void betterAddProduct(int id, String name, int stock, int day, int demand) {
 // IMPLEMENT THIS METHOD
 }

 /\*
 \* Returns the string representation of the warehouse
 \*/
 public String toString() {
 String warehouseString = "[\n";

 for (int i = 0; i < 10; i++) {
 warehouseString += "\t" + sectors[i].toString() + "\n";
 }
 
 return warehouseString + "]";
 }

 /\*
 \* Do not remove this method, it is used by Autolab
 \*/ 
 public Sector[] getSectors () {
 return sectors;
 }
}
Complete all the methods with the comment // IMPLEMENT THIS METHOD
user
Sure, I can provide some pseudocode implementations for the methods in the `Warehouse` class. Note that this is just pseudocode, meaning it may not be syntactically accurate or performance-optimized. It's intended purely as an example of the logic involved in performing the operations on the `HashTable` and `PriorityQueue` data structures mentioned in the prompt.

```
public class Warehouse {
    private Sector[] sectors; // A 10-element array of Sector objects, initialized in the constructor

    public Warehouse() {
        sectors = new Sector[10];

        // Initialize all the sectors by default
        for (int i = 0; i < 10; i++) {
            sectors[i] = new Sector();
        }
    }

    // **PRIORITY QUEUE IMPLEMENTATION**

    public void addProduct(int id, String name, int stock, int day, int demand) {
        int index = locate(id); // Use some efficient, fast-time method to find the index of the existing item with this ID, or return -1 if none found

        if (index == -1) {
            // If the product doesn't already exist, add it to the end of the correct sector
            addToEnd(id, name, stock, day, demand);
        } else {
            // If the product already exists, increment its stock
            restockProduct(id, demand);
        }

        // Fix the heap structure of the sector the product belongs to
        fixHeap(index);
    }

    private void addToEnd(int id, String name, int stock, int day, int demand) {
        // This method should add the new item to the end of the corresponding sector's priority queue
        // (using a Sector class with PriorityQueue functionality, of course)
        // You can use a constructor to add the new item directly to the PQ in O(1) time
    }

    private void fixHeap(int index) {
        // This method should "fix" the heap structure of the sector (using a Sector class).
        // This usually involves "swimming" down the newly-added item until it reaches its correct location.
        // Implement this with an iterative method if your priority queue class doesn't have swim() & sink() methods.
    }

    private void evictIfNeeded(int id) {
        // This method should remove the least popular item from the correct sector, if its size exceeds 5.
        // Implement it using an iterative method, by locating the item with least remaining stock and removing it.
    }

    // **HASH TABLE IMPLEMENTATION**

    private int locate(int id) {
        // This method should perform very fast key lookup on your HashTable,
        // finding the index (or null if not found) where the item with this ID should be added.
    }

    public void restockProduct(int id, int amount) {
        int index = locate(id);

        if (index != -1) {
            // Increment the stock associated with the product
            int currentStock = sectors[index].items.getStock(id);
            currentStock += amount;
            sectors[index].items.setStock(id, currentStock);
        }
    }

    public void deleteProduct(int id) {
        int index = locate(id);

        if (index != -1) {
            // Remove the product, if exists
            sectors[index].items.deleteLast(id);
        }
    }

    public void purchaseProduct(int id, int day, int amount) {
        int index = locate(id);

        if (index != -1) {
            // Decrease the stock associated with the product
            int currentStock = sectors[index].items.getStock(id);
            if (currentStock - amount >= 0) {
                currentStock -= amount;
                sectors[index].items.setStock(id, currentStock);
                sectors[index].items.get(id).setLastPurchaseDay(day); // Set the latest purchase day and demand
            } else {
                // If the demand is greater than stock, don't purchase
                throw new Exception("Not enough stock available for the given demand.");
            }
        }
    }

    public String toString() {
        StringBuilder sb = new StringBuilder("[\n");

        for (int i = 0; i < 10; i++) {
            sb.append("\t").append(sectors[i].toString()).append("\n");
        }

        return sb.append("]").toString();
    }

    public Sector[] getSectors() {
        return sectors;
    }
}
```

Again, this is just pseudocode, so it might contain issues, but it does try to give a pretense of how the data structures are being used. Feel free to use it as reference but **it's not meant to be implemented like this**. You'll need to refactor it into a more optimized and adapted version tailored to your specific requirements.
assistant
package warehouse;

/\*
 \*
 \* This class implements a warehouse on a Hash Table like structure, 
 \* where each entry of the table stores a priority queue. 
 \* Due to your limited space, you are unable to simply rehash to get more space. 
 \* However, you can use your priority queue structure to delete less popular items 
 \* and keep the space constant.
 \* 
 \* @author Ishaan Ivaturi
 \*/ 
public class Warehouse {
 private Sector[] sectors;
 
 // Initializes every sector to an empty sector
 public Warehouse() {
 sectors = new Sector[10];

 for (int i = 0; i < 10; i++) {
 sectors[i] = new Sector();
 }
 }
 
 /\*\*
 \* Provided method, code the parts to add their behavior
 \* @param id The id of the item to add
 \* @param name The name of the item to add
 \* @param stock The stock of the item to add
 \* @param day The day of the item to add
 \* @param demand Initial demand of the item to add
 \*/
 public void addProduct(int id, String name, int stock, int day, int demand) {
 evictIfNeeded(id);
 addToEnd(id, name, stock, day, demand);
 fixHeap(id);
 }

 /\*\*
 \* Add a new product to the end of the correct sector
 \* Requires proper use of the .add() method in the Sector class
 \* @param id The id of the item to add
 \* @param name The name of the item to add
 \* @param stock The stock of the item to add
 \* @param day The day of the item to add
 \* @param demand Initial demand of the item to add
 \*/
 private void addToEnd(int id, String name, int stock, int day, int demand) {
 // IMPLEMENT THIS METHOD
 }

 /\*\*
 \* Fix the heap structure of the sector, assuming the item was already added
 \* Requires proper use of the .swim() and .getSize() methods in the Sector class
 \* @param id The id of the item which was added
 \*/
 private void fixHeap(int id) {
 // IMPLEMENT THIS METHOD
 }

 /\*\*
 \* Delete the least popular item in the correct sector, only if its size is 5 while maintaining heap
 \* Requires proper use of the .swap(), .deleteLast(), and .sink() methods in the Sector class
 \* @param id The id of the item which is about to be added
 \*/
 private void evictIfNeeded(int id) {
 // IMPLEMENT THIS METHOD
 }

 /\*\*
 \* Update the stock of some item by some amount
 \* Requires proper use of the .getSize() and .get() methods in the Sector class
 \* Requires proper use of the .updateStock() method in the Product class
 \* @param id The id of the item to restock
 \* @param amount The amount by which to update the stock
 \*/
 public void restockProduct(int id, int amount) {
 // IMPLEMENT THIS METHOD
 }
 
 /\*\*
 \* Delete some arbitrary product while maintaining the heap structure in O(logn)
 \* Requires proper use of the .getSize(), .get(), .swap(), .deleteLast(), .sink() and/or .swim() methods
 \* Requires proper use of the .getId() method from the Product class
 \* @param id The id of the product to delete
 \*/
 public void deleteProduct(int id) {
 // IMPLEMENT THIS METHOD
 }
 
 /\*\*
 \* Simulate a purchase order for some product
 \* Requires proper use of the getSize(), sink(), get() methods in the Sector class
 \* Requires proper use of the getId(), getStock(), setLastPurchaseDay(), updateStock(), updateDemand() methods
 \* @param id The id of the purchased product
 \* @param day The current day
 \* @param amount The amount purchased
 \*/
 public void purchaseProduct(int id, int day, int amount) {
 // IMPLEMENT THIS METHOD
 }
 
 /\*\*
 \* Construct a better scheme to add a product, where empty spaces are always filled
 \* @param id The id of the item to add
 \* @param name The name of the item to add
 \* @param stock The stock of the item to add
 \* @param day The day of the item to add
 \* @param demand Initial demand of the item to add
 \*/
 public void betterAddProduct(int id, String name, int stock, int day, int demand) {
 // IMPLEMENT THIS METHOD
 }

 /\*
 \* Returns the string representation of the warehouse
 \*/
 public String toString() {
 String warehouseString = "[\n";

 for (int i = 0; i < 10; i++) {
 warehouseString += "\t" + sectors[i].toString() + "\n";
 }
 
 return warehouseString + "]";
 }

 /\*
 \* Do not remove this method, it is used by Autolab
 \*/ 
 public Sector[] getSectors () {
 return sectors;
 }
}
Complete all the methods with the comment // IMPLEMENT THIS METHOD
user
Sure, I can help you implement these methods in your `Warehouse` class. Here's how you might do it:

```java
private void addToEnd(int id, String name, int stock, int day, int demand) {
    int sectorIndex = id % 10; // Assuming id is used to determine the sector
    sectors[sectorIndex].add(new Product(id, name, stock, day, demand));
}

private void fixHeap(int id) {
    int sectorIndex = id % 10;
    sectors[sectorIndex].swim(sectors[sectorIndex].getSize() - 1);
}

private void evictIfNeeded(int id) {
    int sectorIndex = id % 10;
    if (sectors[sectorIndex].getSize() == 5) {
        sectors[sectorIndex].swap(0, sectors[sectorIndex].getSize() - 1);
        sectors[sectorIndex].deleteLast();
        sectors[sectorIndex].sink(0);
    }
}

public void restockProduct(int id, int amount) {
    for (Sector sector : sectors) {
        for (int i = 0; i < sector.getSize(); i++) {
            Product product = sector.get(i);
            if (product.getId() == id) {
                product.updateStock(amount);
                sector.swim(i);
                sector.sink(i);
                break;
            }
        }
    }
}

public void deleteProduct(int id) {
    for (Sector sector : sectors) {
        for (int i = 0; i < sector.getSize(); i++) {
            Product product = sector.get(i);
            if (product.getId() == id) {
                sector.swap(i, sector.getSize() - 1);
                sector.deleteLast();
                sector.swim(i);
                sector.sink(i);
                break;
            }
        }
    }
}

public void purchaseProduct(int id, int day, int amount) {
    for (Sector sector : sectors) {
        for (int i = 0; i < sector.getSize(); i++) {
            Product product = sector.get(i);
            if (product.getId() == id) {
                product.setLastPurchaseDay(day);
                product.updateStock(-amount);
                product.updateDemand();
                sector.swim(i);
                sector.sink(i);
                break;
            }
        }
    }
}

public void betterAddProduct(int id, String name, int stock, int day, int demand) {
    for (Sector sector : sectors) {
        if (sector.getSize() < 5) {
            sector.add(new Product(id, name, stock, day, demand));
            sector.swim(sector.getSize() - 1);
            return;
        }
    }
    evictIfNeeded(id);
    addToEnd(id, name, stock, day, demand);
    fixHeap(id);
}
```
assistant