org.crsh.term.console
Class TermIOBuffer

java.lang.Object
  org.crsh.term.console.TermIOBuffer

All Implemented Interfaces:

Appendable, Iterator<CharSequence>

final class TermIOBuffer

extends Object

implements Appendable, Iterator<CharSequence>

buffer

private char[] buffer

.

size

private int size

.

curAt

private int curAt

Cursor Position, always equal to size unless the underlying *.IO class supports editing.

lines

private LinkedList<CharSequence> lines

.

previousCR

private boolean previousCR

Do we have a issued a CR previously?

echoing

private boolean echoing

Whether or not we do echoing.

io

private final TermIO io

.

TermIOBuffer

TermIOBuffer(TermIO io)

clear

void clear()

Clears the buffer without doing any echoing.

getSize

int getSize()

Returns the total number of chars in the buffer, independently of the cursor position.

Returns:

the number of chars

getCursor

int getCursor()

Returns the current cursor position.

Returns:

the cursor position

charAt

char charAt(int index)
      throws IndexOutOfBoundsException

Returns a character at a specified index in the buffer.

Parameters:

index - the index

Returns:

the char

Throws:

IndexOutOfBoundsException - if the index is negative or larget than the size

getBufferToCursor

CharSequence getBufferToCursor()

isEchoing

boolean isEchoing()

setEchoing

void setEchoing(boolean echoing)

hasNext

public boolean hasNext()

Specified by:

hasNext in interface Iterator<CharSequence>

next

public CharSequence next()

Specified by:

next in interface Iterator<CharSequence>

remove

public void remove()

Specified by:

remove in interface Iterator<CharSequence>

append

public TermIOBuffer append(char c)
                    throws IOException

Specified by:

append in interface Appendable

Throws:

IOException

append

public TermIOBuffer append(CharSequence s)
                    throws IOException

Specified by:

append in interface Appendable

Throws:

IOException

append

public TermIOBuffer append(CharSequence csq,
                           int start,
                           int end)
                    throws IOException

Specified by:

append in interface Appendable

Throws:

IOException

replace

CharSequence replace(CharSequence s)
               throws IOException

Replace all the characters before the cursor by the provided char sequence.

Parameters:

s - the new char sequence

Returns:

the l

Throws:

IOException - any IOException

moveRight

boolean moveRight()
            throws IOException

Throws:

IOException

moveLeft

boolean moveLeft()
           throws IOException

Throws:

IOException

moveRight

int moveRight(int count)
        throws IOException,
               IllegalArgumentException

Throws:

IOException

IllegalArgumentException

moveLeft

int moveLeft(int count)
       throws IOException,
              IllegalArgumentException

Throws:

IOException

IllegalArgumentException

del

int del()
  throws IOException

Delete the char under the cursor or return -1 if no char was deleted.

Returns:

the deleted char

Throws:

IOException - any IOException

appendData

private boolean appendData(CharSequence s,
                           int start,
                           int end)
                    throws IOException

Throws:

IOException

appendData

private boolean appendData(char c)
                    throws IOException

Append a char at the current cursor position and increment the cursor position.

Parameters:

c - the char to append

Returns:

true if flush is required

Throws:

IOException - any IOException

appendDel

private int appendDel()
               throws IOException

Delete the char before the cursor.

Returns:

the removed char value or -1 if no char was removed

Throws:

IOException - any IOException

echo

private boolean echo(char c)
              throws IOException

Throws:

IOException

echo

private void echo(String s)
           throws IOException

Throws:

IOException

echoDel

private boolean echoDel()
                 throws IOException

Throws:

IOException

echoCRLF

private boolean echoCRLF()
                  throws IOException

Throws:

IOException

pop

private int pop()

Popup one char from buffer at the current cursor position.

Returns:

the popped char or -1 if none was removed

push

private boolean push(char c)

Push one char in the buffer at the current cursor position. This operation ensures that the buffer is large enough and it may increase the buffer capacity when required. The cursor position is incremented when a char is appended at the last position, otherwise the cursor position remains unchanged.

Parameters:

c - the char to push

Returns:

true if the cursor position was incremented