Package org.aspectj.org.eclipse.jdt.internal.core

Class Buffer

java.lang.Object

org.aspectj.org.eclipse.jdt.internal.core.Buffer

All Implemented Interfaces:

IBuffer

Direct Known Subclasses:

NullBuffer

public class Buffer
extends Object
implements IBuffer

See Also:

• IBuffer

Nested Class Summary

Nested classes/interfaces inherited from interface org.aspectj.org.eclipse.jdt.core.IBuffer

IBuffer.ITextEditCapability

Field Summary

Fields

Modifier and Type	Field	Description
protected org.eclipse.core.runtime.ListenerList<IBufferChangedListener>	changeListeners
protected char[]	contents
protected static final int	F_HAS_UNSAVED_CHANGES
protected static final int	F_IS_CLOSED
protected static final int	F_IS_READ_ONLY
protected final org.eclipse.core.resources.IFile	file
protected int	flags
protected int	gapEnd
protected int	gapStart
protected Object	lock
protected final IOpenable	owner

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	Buffer(org.eclipse.core.resources.IFile file, IOpenable owner, boolean readOnly)	Creates a new buffer on an underlying resource.

Method Summary

Modifier and Type	Method	Description
void	addBufferChangedListener(IBufferChangedListener listener)	Adds the given listener for changes to this buffer.
void	append(char[] text)	Append the text to the actual content, the gap is moved to the end of the text.
void	append(String text)	Append the text to the actual content, the gap is moved to the end of the text.
void	close()	Closes the buffer.
char	getChar(int position)	Returns the character at the given position in this buffer.
char[]	getCharacters()	Returns the contents of this buffer as a character array, or null if the buffer has not been initialized.
String	getContents()	Returns the contents of this buffer as a String.
int	getLength()	Returns number of characters stored in this buffer.
IOpenable	getOwner()	Returns the Java openable element owning of this buffer.
String	getText(int offset, int length)	Returns the given range of text in this buffer.
org.eclipse.core.resources.IResource	getUnderlyingResource()	Returns the underlying resource for which this buffer was opened, or null if this buffer was not opened on a resource.
boolean	hasUnsavedChanges()	Returns whether this buffer has been modified since it was opened or since it was last saved.
boolean	isClosed()	Returns whether this buffer has been closed.
boolean	isReadOnly()	Returns whether this buffer is read-only.
protected void	moveAndResizeGap(int position, int size)	Moves the gap to location and adjust its size to the anticipated change size.
protected void	notifyChanged(BufferChangedEvent event)	Notify the listeners that this buffer has changed.
void	removeBufferChangedListener(IBufferChangedListener listener)	Removes the given listener from this buffer.
void	replace(int position, int length, char[] text)	Replaces length characters starting from position with text.
void	replace(int position, int length, String text)	Replaces length characters starting from position with text.
void	save(org.eclipse.core.runtime.IProgressMonitor progress, boolean force)	Saves the contents of this buffer to its underlying resource.
void	setContents(char[] newContents)	Sets the contents of this buffer to the given character array.
void	setContents(String newContents)	Sets the contents of this buffer to the given String.
protected void	setReadOnly(boolean readOnly)	Sets this Buffer to be read only.
String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Details

file

protected final org.eclipse.core.resources.IFile file

flags

protected int flags

contents

protected char[] contents

changeListeners

protected org.eclipse.core.runtime.ListenerList<IBufferChangedListener> changeListeners

owner

protected final IOpenable owner

gapStart

protected int gapStart

gapEnd

protected int gapEnd

lock

protected Object lock

F_HAS_UNSAVED_CHANGES

protected static final int F_HAS_UNSAVED_CHANGES

See Also:

• Constant Field Values

F_IS_READ_ONLY

protected static final int F_IS_READ_ONLY

See Also:

• Constant Field Values

F_IS_CLOSED

protected static final int F_IS_CLOSED

See Also:

• Constant Field Values

Constructor Details

Buffer

protected Buffer(org.eclipse.core.resources.IFile file,
 IOpenable owner,
 boolean readOnly)

Creates a new buffer on an underlying resource.

Method Details

addBufferChangedListener

public void addBufferChangedListener(IBufferChangedListener listener)

Description copied from interface: IBuffer

Adds the given listener for changes to this buffer. Has no effect if an identical listener is already registered or if the buffer is closed.

Specified by:

addBufferChangedListener in interface IBuffer

Parameters:

listener - the listener of buffer changes

See Also:

• IBuffer

append

public void append(char[] text)

Append the text to the actual content, the gap is moved to the end of the text.

Specified by:

append in interface IBuffer

Parameters:

text - the given character array to append to contents of the buffer

append

public void append(String text)

Append the text to the actual content, the gap is moved to the end of the text.

Specified by:

append in interface IBuffer

Parameters:

text - the String to append to the contents of the buffer

close

public void close()

Description copied from interface: IBuffer

Closes the buffer. Any unsaved changes are lost. Reports a buffer changed event with a 0 offset and a 0 length. When this event is fired, the buffer should already be closed.

Further operations on the buffer are not allowed, except for close. If an attempt is made to close an already closed buffer, the second attempt has no effect.

Specified by:

close in interface IBuffer

See Also:

• IBuffer

getChar

public char getChar(int position)

Description copied from interface: IBuffer

Returns the character at the given position in this buffer.

The returned value is undefined if the buffer is closed.

Specified by:

getChar in interface IBuffer

Parameters:

position - a zero-based source offset in this buffer

Returns:

the character at the given position in this buffer

See Also:

• IBuffer

getCharacters

public char[] getCharacters()

Description copied from interface: IBuffer

Returns the contents of this buffer as a character array, or null if the buffer has not been initialized.

Callers should make no assumption about whether the returned character array is or is not the genuine article or a copy. In other words, if the client wishes to change this array, they should make a copy. Likewise, if the client wishes to hang on to the array in its current state, they should make a copy.

The returned value is undefined if the buffer is closed.

Specified by:

getCharacters in interface IBuffer

Returns:

the characters contained in this buffer

See Also:

• IBuffer

getContents

public String getContents()

Description copied from interface: IBuffer

Returns the contents of this buffer as a String. Like all strings, the result is an immutable value object., It can also answer null if the buffer has not been initialized.

The returned value is undefined if the buffer is closed.

Specified by:

getContents in interface IBuffer

Returns:

the contents of this buffer as a String

See Also:

• IBuffer

getLength

public int getLength()

Description copied from interface: IBuffer

Returns number of characters stored in this buffer.

The returned value is undefined if the buffer is closed.

Specified by:

getLength in interface IBuffer

Returns:

the number of characters in this buffer

See Also:

• IBuffer

getOwner

public IOpenable getOwner()

Description copied from interface: IBuffer

Returns the Java openable element owning of this buffer.

Specified by:

getOwner in interface IBuffer

Returns:

the openable element owning this buffer

See Also:

• IBuffer

getText

public String getText(int offset,
 int length)

Description copied from interface: IBuffer

Returns the given range of text in this buffer.

The returned value is undefined if the buffer is closed.

Specified by:

getText in interface IBuffer

Parameters:

offset - the zero-based starting offset

length - the number of characters to retrieve

Returns:

the given range of text in this buffer

See Also:

• IBuffer

getUnderlyingResource

public org.eclipse.core.resources.IResource getUnderlyingResource()

Description copied from interface: IBuffer

Returns the underlying resource for which this buffer was opened, or null if this buffer was not opened on a resource.

Specified by:

getUnderlyingResource in interface IBuffer

Returns:

the underlying resource for this buffer, or null if none.

See Also:

• IBuffer

hasUnsavedChanges

public boolean hasUnsavedChanges()

Description copied from interface: IBuffer

Returns whether this buffer has been modified since it was opened or since it was last saved. If a buffer does not have an underlying resource, this method always returns true.

NOTE: when a buffer does not have unsaved changes, the model may decide to close it to claim some memory back. If the associated element needs to be reopened later on, its buffer factory will be requested to create a new buffer.

Specified by:

hasUnsavedChanges in interface IBuffer

Returns:

a boolean indicating presence of unsaved changes (in the absence of any underlying resource, it will always return true).

See Also:

• IBuffer

isClosed

public boolean isClosed()

Description copied from interface: IBuffer

Returns whether this buffer has been closed.

Specified by:

isClosed in interface IBuffer

Returns:

a boolean indicating whether this buffer is closed.

See Also:

• IBuffer

isReadOnly

public boolean isReadOnly()

Description copied from interface: IBuffer

Returns whether this buffer is read-only.

Specified by:

isReadOnly in interface IBuffer

Returns:

a boolean indicating whether this buffer is read-only

See Also:

• IBuffer

moveAndResizeGap

protected void moveAndResizeGap(int position,
 int size)

Moves the gap to location and adjust its size to the anticipated change size. The size represents the expected range of the gap that will be filled after the gap has been moved. Thus the gap is resized to actual size + the specified size and moved to the given position.

notifyChanged

protected void notifyChanged(BufferChangedEvent event)

Notify the listeners that this buffer has changed. To avoid deadlock, this should not be called in a synchronized block.

removeBufferChangedListener

public void removeBufferChangedListener(IBufferChangedListener listener)

Description copied from interface: IBuffer

Removes the given listener from this buffer. Has no effect if an identical listener is not registered or if the buffer is closed.

Specified by:

removeBufferChangedListener in interface IBuffer

Parameters:

listener - the listener

See Also:

• IBuffer

replace

public void replace(int position,
 int length,
 char[] text)

Replaces length characters starting from position with text. After that operation, the gap is placed at the end of the inserted text.

Specified by:

replace in interface IBuffer

Parameters:

position - the zero-based starting position of the affected text range in this buffer

length - the length of the affected text range in this buffer

text - the replacing text as a character array

replace

public void replace(int position,
 int length,
 String text)

Replaces length characters starting from position with text. After that operation, the gap is placed at the end of the inserted text.

Specified by:

replace in interface IBuffer

Parameters:

position - the zero-based starting position of the affected text range in this buffer

length - the length of the affected text range in this buffer

text - the replacing text as a String

save

public void save(org.eclipse.core.runtime.IProgressMonitor progress,
 boolean force)
          throws JavaModelException

Description copied from interface: IBuffer

Saves the contents of this buffer to its underlying resource. If successful, this buffer will have no unsaved changes. The buffer is left open. Saving a buffer with no unsaved changes has no effect - the underlying resource is not changed. If the buffer does not have an underlying resource or is read-only, this has no effect.

The force parameter controls how this method deals with cases where the workbench is not completely in sync with the local file system. If false is specified, this method will only attempt to overwrite a corresponding file in the local file system provided it is in sync with the workbench. This option ensures there is no unintended data loss; it is the recommended setting. However, if true is specified, an attempt will be made to write a corresponding file in the local file system, overwriting any existing one if need be. In either case, if this method succeeds, the resource will be marked as being local (even if it wasn't before).

Has no effect if this buffer is read-only or if the buffer is closed.

Specified by:

save in interface IBuffer

Parameters:

progress - the progress monitor to notify

force - a boolean flag indicating how to deal with resource inconsistencies.

Throws:

JavaModelException - if an error occurs writing the buffer to the underlying resource

See Also:

• IBuffer

setContents

public void setContents(char[] newContents)

Description copied from interface: IBuffer

Sets the contents of this buffer to the given character array. This buffer will now have unsaved changes. Any client can set the contents of the buffer, not just the owner of the buffer. Reports a buffer changed event.

Equivalent to replace(0,getLength(),contents).

Has no effect if this buffer is read-only or if the buffer is closed.

Specified by:

setContents in interface IBuffer

Parameters:

newContents - the new contents of this buffer as a character array

See Also:

• IBuffer

setContents

public void setContents(String newContents)

Description copied from interface: IBuffer

Sets the contents of this buffer to the given String. This buffer will now have unsaved changes. Any client can set the contents of the buffer, not just the owner of the buffer. Reports a buffer changed event.

Equivalent to replace(0,getLength(),contents).

Has no effect if this buffer is read-only or if the buffer is closed.

Specified by:

setContents in interface IBuffer

Parameters:

newContents - the new contents of this buffer as a String

See Also:

• IBuffer

setReadOnly

protected void setReadOnly(boolean readOnly)

Sets this Buffer to be read only.

toString

public String toString()

Overrides:

toString in class Object