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## org.eclipse.ui.texteditor
Interface IDocumentProvider

All Known Implementing Classes:
  AbstractDocumentProvider, ForwardingDocumentProvider, TextFileDocumentProvider, TextFileDocumentProvider.NullProvider

public interface IDocumentProvider

A document provider maps between domain elements and documents. A document provider has the following responsibilities:

- create an annotation model of a domain model element
- create and manage a textual representation, i.e., a document, of a domain model element
- create and save the content of domain model elements based on given documents
- update the documents this document provider manages for domain model elements to changes directly applied to those domain model elements
- notify all element state listeners about changes directly applied to domain model elements this document provider manages a document for, i.e. the document provider must know which changes of a domain model element are to be interpreted as element moves, deletes, etc.

Text editors use document providers to bridge the gap between their input elements and the documents they work on. A single document provider may be shared between multiple editors; the methods take the editors' input elements as a parameter.

This interface may be implemented by clients; or subclass the standard abstract base class `AbstractDocumentProvider`.

In order to provided backward compatibility for clients of `IDocumentProvider`, extension interfaces are used to provide a means of evolution. The following extension interfaces exist:

- `IDocumentProviderExtension` since version 2.0 introducing state validation, extended read-only handling and synchronization.
- `IDocumentProviderExtension2` since version 2.1 introducing adding support for a global progress monitor.
- `IDocumentProviderExtension3` since version 3.0 adding a predicate for querying synchronization state.

See Also:
  `IDocument`, `AbstractDocumentProvider`, `IDocumentProviderExtension`, `IDocumentProviderExtension2`, `IDocumentProviderExtension3`

Method Summary
`void` | `aboutToChange(Object element)` Informs this document provider about upcoming changes of the given element.
`void` | `addElementStateListener(IElementStateListener listener)` Adds the given element state listener to this document provider.
`boolean` | `canSaveDocument(Object element)` Returns whether the document provided for the given element differs from its original state which would required that it be saved.
`void` | `changed(Object element)` Informs this document provider that the given element has been changed.
`void` | `connect(Object element)` Connects the given element to this document provider.
`void` | `disconnect(Object element)` Disconnects the given element from this document provider.
`IAnnotationModel` | `getAnnotationModel(Object element)` Returns the annotation model for the given element.
`IDocument` | `getDocument(Object element)` Returns the document for the given element.
`long` | `getModificationStamp(Object element)` Returns the modification stamp of the given element.
`long` | `getSynchronizationStamp(Object element)` Returns the time stamp of the last synchronization of the given element and it's provided document.
`boolean` | `isDeleted(Object element)` Returns whether the given element has been deleted.
`boolean` | `mustSaveDocument(Object element)` Returns whether the document provided for the given element must be saved.
`void` | `removeElementStateListener(IElementStateListener listener)` Removes the given element state listener from this document provider.
`void` | `resetDocument(Object element)` Resets the given element's document to its last saved state.
`void` | `saveDocument(IProgressMonitor monitor, Object element, IDocument document, boolean overwrite)` Saves the given document provided for the given element.

Method Detail

### connect

    public void connect(Object element)
                 throws CoreException

  Connects the given element to this document provider. This tells the provider that caller of this method is interested to work with the document provided for the given domain model element. By counting the invocations of this method and `disconnect(Object)` this provider can assume to know the correct number of clients working with the document provided for that domain model element.

  The given element must not be `null`.

  Parameters:
    `element` - the element
  Throws:
    `CoreException` - if the textual representation or the annotation model of the element could not be created

### disconnect

    public void disconnect(Object element)

  Disconnects the given element from this document provider. This tells the provider that the caller of this method is no longer interested in working with the document provided for the given domain model element. By counting the invocations of `connect(Object)` and of this method this provider can assume to know the correct number of clients working with the document provided for that domain model element.

  The given element must not be `null`.

  Parameters:
    `element` - the element

### getDocument

    public IDocument getDocument(Object element)

  Returns the document for the given element. Usually the document contains a textual presentation of the content of the element, or is the element itself.

  Parameters:
    `element` - the element, or `null`
  Returns:
    the document, or `null` if none

### resetDocument

    public void resetDocument(Object element)
                       throws CoreException

  Resets the given element's document to its last saved state. Element state listeners are notified both before (`elementContentAboutToBeReplaced`) and after (`elementContentReplaced`) the content is changed.

  Parameters:
    `element` - the element, or `null`
  Throws:
    `CoreException` - if document could not be reset for the given element

### saveDocument

    public void saveDocument(IProgressMonitor monitor,
                             Object element,
                             IDocument document,
                             boolean overwrite)
                      throws CoreException

  Saves the given document provided for the given element.

  Parameters:
    `monitor` - a progress monitor to report progress and request cancellation
    `element` - the element, or `null`
    `document` - the document
    `overwrite` - indicates whether overwrite should be performed while saving the given element if necessary
  Throws:
    `CoreException` - if document could not be stored to the given element

### getModificationStamp

    public long getModificationStamp(Object element)

  Returns the modification stamp of the given element.

  Parameters:
    `element` - the element
  Returns:
    the modification stamp of the given element

### getSynchronizationStamp

    public long getSynchronizationStamp(Object element)

  Returns the time stamp of the last synchronization of the given element and it's provided document.

  Parameters:
    `element` - the element
  Returns:
    the synchronization stamp of the given element

### isDeleted

    public boolean isDeleted(Object element)

  Returns whether the given element has been deleted.

  Parameters:
    `element` - the element
  Returns:
    `true` if the element has been deleted

### mustSaveDocument

    public boolean mustSaveDocument(Object element)

  Returns whether the document provided for the given element must be saved.

  Parameters:
    `element` - the element, or `null`
  Returns:
    `true` if the document must be saved, and `false` otherwise (including the element is `null`)

### canSaveDocument

    public boolean canSaveDocument(Object element)

  Returns whether the document provided for the given element differs from its original state which would required that it be saved.

  Parameters:
    `element` - the element, or `null`
  Returns:
    `true` if the document can be saved, and `false` otherwise (including the element is `null`)

### getAnnotationModel

    public IAnnotationModel getAnnotationModel(Object element)

  Returns the annotation model for the given element.

  Parameters:
    `element` - the element, or `null`
  Returns:
    the annotation model, or `null` if none

### aboutToChange

    public void aboutToChange(Object element)

  Informs this document provider about upcoming changes of the given element. The changes might cause change notifications specific for the type of the given element. If this provider manages a document for the given element, the document provider must not change the document because of the notifications received after `aboutToChange` has been and before `changed` is called. In this case, it is assumed that the document is already up to date, e.g., a save operation is a typical case.

  The concrete nature of the change notification depends on the concrete type of the given element. If the element is, e.g., an `IResource` the notification is a resource delta.

  Parameters:
    `element` - the element, or `null`

### changed

    public void changed(Object element)

  Informs this document provider that the given element has been changed. All notifications have been sent out. If this provider manages a document for the given element, the document provider must from now on change the document on the receipt of change notifications. The concrete nature of the change notification depends on the concrete type of the given element. If the element is, e.g., an `IResource` the notification is a resource delta.

  Parameters:
    `element` - the element, or `null`

### addElementStateListener

    public void addElementStateListener(IElementStateListener listener)

  Adds the given element state listener to this document provider. Has no effect if an identical listener is already registered.

  Parameters:
    `listener` - the listener

### removeElementStateListener

    public void removeElementStateListener(IElementStateListener listener)

  Removes the given element state listener from this document provider. Has no affect if an identical listener is not registered.

  Parameters:
    `listener` - the listener

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