Question

In order to achieve faster access to data, many I/O operations involve specific data structure class called "Buffer". Our goal in this question is to design a UML class diagram for a character buffer (an array of chars ) based on the following description. This particular buffer:

1. has the name charBuffer
2. has a definite size
3. has an indicator whether it is empty or not
4. has an indicator whether it is full or not
5. has write to buffer operation
6. has read from buffer operation
7. has delete buffer operation
8. has check for emptiness operation
9. has check for fullness operation

Answer 1

UML class diagram for Buffer:

Buffer

- charBuffer : char* - size : int - empty : bool - full : bool

+ writeToBuffer(buffer : char*) : void + readFromBuffer() : char* + deleteBuffer() : void + isEmpty() : bool + isFull() : bool

Buffer class has the following data members:

• charBuffer : char* -  which is an array of characters to store the contents to the buffer
• size : int - which contains the maximum size of the buffer (integer)
• empty : bool - which is indicator if buffer is empty or not (boolean)
• full : bool - which is an indicator if buffer is full or not (boolean)

Buffer class has the following functions:

• writeToBuffer(buffer : char*) : void - write the contents of buffer to charBuffer
• readFromBuffer() - char* - return the contents of charBuffer
• deleteBuffer() : void - delete the contents of charBuffer
• isEmpty() : bool - returns if Buffer is empty or not (returns empty data member)
• isFull() : bool - returns if Buffer is full or not (returns full data member)