Package org.eclipse.handly.buffer

Class Buffer

java.lang.Object
org.eclipse.handly.buffer.Buffer
All Implemented Interfaces:
AutoCloseable, IBuffer, ISnapshotProvider, IReferenceCountable
Direct Known Subclasses:
ChildBuffer
public class Buffer extends Object implements IBuffer
A simple IBuffer implementation. This implementation is not backed by an underlying resource, so saving the buffer only modifies its "dirty" state; it does not really save its contents.

An instance of this class is safe for use by multiple threads. Clients can use this class as it stands or subclass it as circumstances warrant.

  • Constructor Details

    • Buffer

      public Buffer()
      Creates a new buffer instance that is initially empty.

      It is the client responsibility to release the created buffer after it is no longer needed.

    • Buffer

      public Buffer(String contents)
      Creates a new buffer instance and initializes it with the given contents.

      It is the client responsibility to release the created buffer after it is no longer needed.

      Parameters:
      contents - initial contents

  • Method Details

    • getDocument

      public org.eclipse.jface.text.IDocument getDocument()
      Description copied from interface: IBuffer
      Returns the underlying document of this buffer. The relationship between a buffer and its document does not change over the lifetime of the buffer.
      Specified by:
      getDocument in interface IBuffer
      Returns:
      the buffer's underlying document (never null)

    • getSnapshot

      public ISnapshot getSnapshot()
      Description copied from interface: IBuffer
      Returns the current snapshot of this buffer. The returned snapshot may immediately become stale or expire.

      Note that it is possible to obtain a non-expiring snapshot from the buffer, although protractedly holding on non-expiring snapshots is not recommended as they may potentially consume large amount of space.

      Specified by:
      getSnapshot in interface IBuffer
      Specified by:
      getSnapshot in interface ISnapshotProvider
      Returns:
      the buffer's current snapshot (never null)

    • applyChange

      public IBufferChange applyChange(IBufferChange change, org.eclipse.core.runtime.IProgressMonitor monitor) throws org.eclipse.core.runtime.CoreException
      Description copied from interface: IBuffer
      Applies the given change to this buffer.

      Note that an update conflict may occur if the buffer's contents have changed since the inception of the snapshot on which the change is based. In that case, a StaleSnapshotException is thrown.

      Specified by:
      applyChange in interface IBuffer
      Parameters:
      change - a buffer change (not null)
      monitor - a progress monitor, or null if progress reporting is not desired. The caller must not rely on IProgressMonitor.done() having been called by the receiver
      Returns:
      undo change, if requested by the change. Otherwise, null
      Throws:
      org.eclipse.core.runtime.CoreException - if the change's edit tree is not in a valid state, or if one of the edits in the tree could not be executed, or if save is requested by the change but the buffer could not be saved

    • save

      public void save(IContext context, org.eclipse.core.runtime.IProgressMonitor monitor) throws org.eclipse.core.runtime.CoreException
      Description copied from interface: IBuffer
      Saves this buffer. It is up to the implementors of this method to decide what saving means. Typically, the contents of the underlying resource is changed to the contents of the buffer.
      Specified by:
      save in interface IBuffer
      Parameters:
      context - the operation context (not null)
      monitor - a progress monitor, or null if progress reporting is not desired. The caller must not rely on IProgressMonitor.done() having been called by the receiver
      Throws:
      org.eclipse.core.runtime.CoreException - if the buffer could not be saved

    • isDirty

      public boolean isDirty()
      Description copied from interface: IBuffer
      Returns whether this buffer has been modified since the last time it was opened or saved.
      Specified by:
      isDirty in interface IBuffer
      Returns:
      true if the buffer has unsaved changes, false otherwise

    • getSupportedListenerMethods

      public int getSupportedListenerMethods()
      Description copied from interface: IBuffer
      Returns a bit-mask describing the listener methods supported by this buffer. The buffer will never invoke a listener method it does not support.
      Specified by:
      getSupportedListenerMethods in interface IBuffer
      Returns:
      a bit-mask describing the supported listener methods
      See Also:

    • addListener

      public void addListener(IBufferListener listener)
      Description copied from interface: IBuffer
      Adds the given listener to this buffer. Has no effect if the same listener is already registered.
      Specified by:
      addListener in interface IBuffer
      Parameters:
      listener - not null

    • removeListener

      public void removeListener(IBufferListener listener)
      Description copied from interface: IBuffer
      Removes the given listener from this buffer. Has no effect if the same listener was not already registered.
      Specified by:
      removeListener in interface IBuffer
      Parameters:
      listener - not null

    • addRef

      public void addRef()
      Description copied from interface: IReferenceCountable
      Spawns a new independent ownership of this object. Each successful call to addRef() must ultimately be followed by exactly one call to IReferenceCountable.release().
      Specified by:
      addRef in interface IBuffer
      Specified by:
      addRef in interface IReferenceCountable
      Specified by:
      addRef in interface ISnapshotProvider

    • release

      public void release()
      Description copied from interface: IReferenceCountable
      Relinquishes an independent ownership of this object. Each independent ownership of the object must ultimately end with exactly one call to this method.
      Specified by:
      release in interface IBuffer
      Specified by:
      release in interface IReferenceCountable
      Specified by:
      release in interface ISnapshotProvider
      See Also:

    • createEmptyDocument

      protected org.eclipse.jface.text.IDocument createEmptyDocument()

    • doSave

      protected void doSave(IContext context, org.eclipse.core.runtime.IProgressMonitor monitor) throws org.eclipse.core.runtime.CoreException
      Throws:
      org.eclipse.core.runtime.CoreException

    • getListeners

      protected Iterable<IBufferListener> getListeners()
      Since:
      1.4