addItem

public boolean addItem(IItem item, IPosition position, Color color) throws ContainerException {
        boolean added = false;
        if (item != null && position != null) {
            if (this.closed) {
                throw new ContainerImplException("The container definition is invalid!");
            } else {
                if (this.find(item) == -1) {
                    if (this.itemsPackedCounter == this.itemsPacked.length) {
                        ItemPacked[] itemsPacked_temp = new ItemPacked[this.itemsPacked.length * 2];

                        for(int i = 0; i < this.itemsPacked.length; ++i) {
                            itemsPacked_temp[i] = this.itemsPacked[i];
                        }

                        this.itemsPacked = itemsPacked_temp;
                    }

                    this.occupiedVolume += item.getVolume();
                    this.itemsPacked[this.itemsPackedCounter++] = new ItemPacked(item, position, color);
                    added = true;
                }

                return added;
            }
        } else {
            throw new ContainerImplException("The container definition is invalid!");
        }
    }