1. Unix File Interface
int open(const char* path, int flags, mode_t permissions); ssize_t read(int fd, void* buffer, size_t count); ssize_t write(int fd, const void* buffer, size_t count); off_t lseek(int fd, off_t offset, int referencePosition); int close(int fd);

2. CS 190 Lecture Notes: Modular Design
Shallow Methods
private void addNullValueForAttribute(String attribute) { data.put(attribute, "null"); } /* Updates the persistent data structures to reflect * the given friendship */ private void persist(FriendshipOp f) { recordStore.append(friendFile, f);
CS 190 Lecture Notes: Modular Design

3. CS 190 Lecture Notes: Modular Design
Java I/O
FileInputStream fileStream =
new FileInputStream(fileName);
BufferedInputStream bufferedStream =
new BufferedInputStream(fileStream);
ObjectInputStream objectStream =
new ObjectInputStream(bufferedStream);
CS 190 Lecture Notes: Modular Design

4. Interface for Text Class
Special-purpose:
void backspace(Cursor cursor);
void delete(Cursor cursor);
void deleteSelection(Selection selection);
General-purpose:
void insert(Position position, String newText);
void delete(Position start, Position end);
Position changePosition(Position position, int numChars);
CS 190 Lecture Notes: Modular Design

5. CS 190 Lecture Notes: Modular Design
Pass-Through Methods
public class TextDocument ... { private TextArea textArea; private WeakReference<TextDocumentListener> listener; ... public Character getLastTypedCharacter() { return textArea.getLastTypedCharacter(); } public int getCursorOffset() { return textArea.getCursorOffset(); public void insertString(String textToInsert, int offset) { textArea.insertText(textToInsert, offset); public void willInsertString(String stringToInsert, int offset) { if (listener != null && listener.get() != null) { listener.get().willInsertString(this, stringToInsert, offset);
CS 190 Lecture Notes: Modular Design

6. CS 190 Lecture Notes: Modular Design
UNIX ioctl
int result = ioctl(int fd, int request,
void* inBuffer, int inputSize,
void* outBuffer, int outputSize);
CS 190 Lecture Notes: Modular Design