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## org.eclipse.ui.editors.text
Class TextFileDocumentProvider

    java.lang.Object
      org.eclipse.ui.editors.text.TextFileDocumentProvider

All Implemented Interfaces:
  IDocumentProvider, IDocumentProviderExtension, IDocumentProviderExtension2, IDocumentProviderExtension3, IStorageDocumentProvider

public class TextFileDocumentProvider
extends Object
implements IDocumentProvider, IDocumentProviderExtension, IDocumentProviderExtension2, IDocumentProviderExtension3, IStorageDocumentProvider

Shared document provider specialized for `IFile` based domain elements. A text file document provider can have a parent document provider to which it may delegate calls i.e. instead of delegating work to a super class it delegates to a parent document provider. The parent chain acts as chain of command.

Text file document providers use text file buffers to access the file content. This allows to share it between various clients including headless ones. Text file document providers should be preferred over file document providers due to this advantage.

Use a forwarding document provider if you need to ensure that all documents provided to clients are appropriately set up.

Clients can directly instantiate and configure this class with a suitable parent document provider or provide their own subclass.

Since:
  3.0

Nested Class Summary
`protected static class` | `TextFileDocumentProvider.DocumentProviderOperation` Operation created by the document provider and to be executed by the providers runnable context.
`protected class` | `TextFileDocumentProvider.FileBufferListener`
`protected static class` | `TextFileDocumentProvider.FileInfo`
`protected static class` | `TextFileDocumentProvider.NullProvider`

Constructor Summary
`TextFileDocumentProvider()` Creates a new text file document provider with no parent.
`TextFileDocumentProvider(IDocumentProvider parentProvider)` Creates a new text file document provider which has the given parent provider.

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.
`protected void` | `commitFileBuffer(IProgressMonitor monitor, TextFileDocumentProvider.FileInfo info, boolean overwrite)` Commits the given file info's file buffer by changing the contents of the underlying file to the contents of this file buffer.
`void` | `connect(Object element)` Connects the given element to this document provider.
`protected IAnnotationModel` | `createAnnotationModel(IFile file)` Creates and returns the annotation model for the given file.
`protected TextFileDocumentProvider.FileInfo` | `createEmptyFileInfo()` Creates and returns a new and empty file info object.
`protected void` | `createFileFromDocument(IProgressMonitor monitor, IFile file, IDocument document)` Creates the given file with the given document content.
`protected TextFileDocumentProvider.FileInfo` | `createFileInfo(Object element)` Creates and returns the file info object for the given element.
`protected TextFileDocumentProvider.DocumentProviderOperation` | `createSaveOperation(Object element, IDocument document, boolean overwrite)`
`void` | `disconnect(Object element)` Disconnects the given element from this document provider.
`protected void` | `disposeFileInfo(Object element, TextFileDocumentProvider.FileInfo info)` Releases all resources described by given element's info object.
`protected void` | `executeOperation(TextFileDocumentProvider.DocumentProviderOperation operation, IProgressMonitor monitor)` Executes the given operation in the providers runnable context.
`protected void` | `fireElementStateChangeFailed(Object element)` Informs all registered element state listeners about the failed state change of the element.
`protected void` | `fireElementStateChanging(Object element)` Informs all registered element state listeners about the current state change of the element.
`IAnnotationModel` | `getAnnotationModel(Object element)` Returns the annotation model for the given element.
`protected Iterator` | `getConnectedElementsIterator()` Returns an iterator over the elements connected via this document provider.
`String` | `getDefaultEncoding()` Returns the default character encoding used by this provider.
`IDocument` | `getDocument(Object element)` Returns the document for the given element.
`protected Iterator` | `getElements(IFileBuffer file)` Returns an iterator for all the elements that are connected to this file buffer.
`String` | `getEncoding(Object element)` Returns the character encoding for the given element, or `null` if the element is not managed by this provider.
`protected TextFileDocumentProvider.FileInfo` | `getFileInfo(Object element)` Returns the file info object for the given element.
`protected Iterator` | `getFileInfosIterator()` Returns an iterator over this document provider's file info objects.
`long` | `getModificationStamp(Object element)` Returns the modification stamp of the given element.
`protected IRunnableContext` | `getOperationRunner(IProgressMonitor monitor)` Returns the runnable context for this document provider.
`protected IDocumentProvider` | `getParentProvider()` Returns the parent document provider.
`IProgressMonitor` | `getProgressMonitor()` Returns this providers progress monitor.
`IStatus` | `getStatus(Object element)` Returns the status 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.
`protected File` | `getSystemFile(TextFileDocumentProvider.FileInfo info)` Returns the system file denoted by the given info.
`protected void` | `handleCoreException(CoreException exception, String message)` Defines the standard procedure to handle `CoreExceptions`.
`boolean` | `isDeleted(Object element)` Returns whether the given element has been deleted.
`boolean` | `isModifiable(Object element)` Returns whether the document provider thinks that the given element can persistently be modified.
`boolean` | `isReadOnly(Object element)` Returns whether the document provider thinks that the given element is read-only.
`boolean` | `isStateValidated(Object element)` Returns whether the state of the given element has been validated.
`boolean` | `isSynchronized(Object element)` Returns whether the information provided for the given element is in sync with the element.
`protected boolean` | `isSystemFileReadOnly(TextFileDocumentProvider.FileInfo info)` Returns whether the system file denoted by the given info is read-only.
`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.
`void` | `setCanSaveDocument(Object element)` Marks the document managed for the given element as saveable.
`void` | `setEncoding(Object element, String encoding)` Sets the encoding for the given element.
`void` | `setParentDocumentProvider(IDocumentProvider parentProvider)` Sets the given parent provider as this document provider's parent document provider.
`void` | `setProgressMonitor(IProgressMonitor progressMonitor)` Sets this providers progress monitor.
`void` | `synchronize(Object element)` Synchronizes the document provided for the given element with the given element.
`void` | `updateStateCache(Object element)` Updates the state cache for the given element.
`void` | `validateState(Object element, Object computationContext)` Validates the state of the given element.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### TextFileDocumentProvider

    public TextFileDocumentProvider()

  Creates a new text file document provider with no parent.

### TextFileDocumentProvider

    public TextFileDocumentProvider(IDocumentProvider parentProvider)

  Creates a new text file document provider which has the given parent provider.

Parameters:
  `parentProvider` - the parent document provider

Method Detail

### setParentDocumentProvider

    public final void setParentDocumentProvider(IDocumentProvider parentProvider)

  Sets the given parent provider as this document provider's parent document provider.

  Parameters:
    `parentProvider` - the parent document provider

### getParentProvider

    protected final IDocumentProvider getParentProvider()

  Returns the parent document provider.

  Returns:
    the parent document provider

### getOperationRunner

    protected IRunnableContext getOperationRunner(IProgressMonitor monitor)

  Returns the runnable context for this document provider.

  Parameters:
    `monitor` - the progress monitor
  Returns:
    the runnable context for this document provider

### executeOperation

    protected void executeOperation(TextFileDocumentProvider.DocumentProviderOperation operation,
                                    IProgressMonitor monitor)
                             throws CoreException

  Executes the given operation in the providers runnable context.

  Parameters:
    `operation` - the operation to be executes
    `monitor` - the progress monitor
  Throws:
    `CoreException` - the operation's core exception

### connect

    public void connect(Object element)
                 throws CoreException

  Description copied from interface: `IDocumentProvider`
  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`.

  Specified by:
    `connect` in interface `IDocumentProvider`
  Parameters:
    `element` - the element
  Throws:
    `CoreException` - if the textual representation or the annotation model of the element could not be created

### createEmptyFileInfo

    protected TextFileDocumentProvider.FileInfo createEmptyFileInfo()

  Creates and returns a new and empty file info object.

  Subclasses which extend `TextFileDocumentProvider.FileInfo` should override this method.

  Returns:
    a new and empty object of type `FileInfo`

### createFileInfo

    protected TextFileDocumentProvider.FileInfo createFileInfo(Object element)
                                                        throws CoreException

  Creates and returns the file info object for the given element.

  Subclasses which extend `TextFileDocumentProvider.FileInfo` will probably have to extend this method as well.

  Parameters:
    `element` - the element
  Returns:
    a file info object of type `FileInfo` or `null` if none can be created
  Throws:
    `CoreException` - if the file info object could not successfully be created

### createAnnotationModel

    protected IAnnotationModel createAnnotationModel(IFile file)

  Creates and returns the annotation model for the given file.

  Parameters:
    `file` - the file
  Returns:
    the file's annotation model or `null` if none

### disconnect

    public void disconnect(Object element)

  Description copied from interface: `IDocumentProvider`
  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`.

  Specified by:
    `disconnect` in interface `IDocumentProvider`
  Parameters:
    `element` - the element

### disposeFileInfo

    protected void disposeFileInfo(Object element,
                                   TextFileDocumentProvider.FileInfo info)

  Releases all resources described by given element's info object.

  Subclasses which extend `TextFileDocumentProvider.FileInfo` will probably have to extend this method as well.

  Parameters:
    `element` - the element
    `info` - the element's file info object

### getElements

    protected Iterator getElements(IFileBuffer file)

  Returns an iterator for all the elements that are connected to this file buffer.

  Parameters:
    `file` - the file buffer
  Returns:
    an iterator for all elements connected with the given file buffer

### getDocument

    public IDocument getDocument(Object element)

  Description copied from interface: `IDocumentProvider`
  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.

  Specified by:
    `getDocument` in interface `IDocumentProvider`
  Parameters:
    `element` - the element, or `null`
  Returns:
    the document, or `null` if none

### resetDocument

    public void resetDocument(Object element)
                       throws CoreException

  Description copied from interface: `IDocumentProvider`
  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.

  Specified by:
    `resetDocument` in interface `IDocumentProvider`
  Parameters:
    `element` - the element, or `null`
  Throws:
    `CoreException` - if document could not be reset for the given element

### saveDocument

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

  Description copied from interface: `IDocumentProvider`
  Saves the given document provided for the given element.

  Specified by:
    `saveDocument` in interface `IDocumentProvider`
  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

### createSaveOperation

    protected TextFileDocumentProvider.DocumentProviderOperation createSaveOperation(Object element,
                                                                                     IDocument document,
                                                                                     boolean overwrite)
                                                                              throws CoreException

  Throws:
    `CoreException`

### commitFileBuffer

    protected void commitFileBuffer(IProgressMonitor monitor,
                                    TextFileDocumentProvider.FileInfo info,
                                    boolean overwrite)
                             throws CoreException

  Commits the given file info's file buffer by changing the contents of the underlying file to the contents of this file buffer. After that call, `isDirty` returns `false` and `isSynchronized` returns `true`.

  Parameters:
    `monitor` - the progress monitor
    `info` - the element's file info object
    `overwrite` - indicates whether the underlying file should be overwritten if it is not synchronized with the file system
  Throws:
    `CoreException` - if writing or accessing the underlying file fails

### createFileFromDocument

    protected void createFileFromDocument(IProgressMonitor monitor,
                                          IFile file,
                                          IDocument document)
                                   throws CoreException

  Creates the given file with the given document content.

  Parameters:
    `monitor` - the progress monitor
    `file` - the file to be created
    `document` - the document to be written to the file
  Throws:
    `CoreException` - if the creation of the file fails

### getModificationStamp

    public long getModificationStamp(Object element)

  Description copied from interface: `IDocumentProvider`
  Returns the modification stamp of the given element.

  Specified by:
    `getModificationStamp` in interface `IDocumentProvider`
  Parameters:
    `element` - the element
  Returns:
    the modification stamp of the given element

### getSynchronizationStamp

    public long getSynchronizationStamp(Object element)

  Description copied from interface: `IDocumentProvider`
  Returns the time stamp of the last synchronization of the given element and it's provided document.

  Specified by:
    `getSynchronizationStamp` in interface `IDocumentProvider`
  Parameters:
    `element` - the element
  Returns:
    the synchronization stamp of the given element

### isDeleted

    public boolean isDeleted(Object element)

  Description copied from interface: `IDocumentProvider`
  Returns whether the given element has been deleted.

  Specified by:
    `isDeleted` in interface `IDocumentProvider`
  Parameters:
    `element` - the element
  Returns:
    `true` if the element has been deleted

### mustSaveDocument

    public boolean mustSaveDocument(Object element)

  Description copied from interface: `IDocumentProvider`
  Returns whether the document provided for the given element must be saved.

  Specified by:
    `mustSaveDocument` in interface `IDocumentProvider`
  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)

  Description copied from interface: `IDocumentProvider`
  Returns whether the document provided for the given element differs from its original state which would required that it be saved.

  Specified by:
    `canSaveDocument` in interface `IDocumentProvider`
  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)

  Description copied from interface: `IDocumentProvider`
  Returns the annotation model for the given element.

  Specified by:
    `getAnnotationModel` in interface `IDocumentProvider`
  Parameters:
    `element` - the element, or `null`
  Returns:
    the annotation model, or `null` if none

### aboutToChange

    public void aboutToChange(Object element)

  Description copied from interface: `IDocumentProvider`
  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.

  Specified by:
    `aboutToChange` in interface `IDocumentProvider`
  Parameters:
    `element` - the element, or `null`

### changed

    public void changed(Object element)

  Description copied from interface: `IDocumentProvider`
  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.

  Specified by:
    `changed` in interface `IDocumentProvider`
  Parameters:
    `element` - the element, or `null`

### addElementStateListener

    public void addElementStateListener(IElementStateListener listener)

  Description copied from interface: `IDocumentProvider`
  Adds the given element state listener to this document provider. Has no effect if an identical listener is already registered.

  Specified by:
    `addElementStateListener` in interface `IDocumentProvider`
  Parameters:
    `listener` - the listener

### removeElementStateListener

    public void removeElementStateListener(IElementStateListener listener)

  Description copied from interface: `IDocumentProvider`
  Removes the given element state listener from this document provider. Has no affect if an identical listener is not registered.

  Specified by:
    `removeElementStateListener` in interface `IDocumentProvider`
  Parameters:
    `listener` - the listener

### isReadOnly

    public boolean isReadOnly(Object element)

  Description copied from interface: `IDocumentProviderExtension`
  Returns whether the document provider thinks that the given element is read-only. If this method returns `true`, `saveDocument` could fail. This method does not say anything about the document constructed from the given element. If the given element is not connected to this document provider, the return value is undefined. Document providers are allowed to use a cache to answer this question, i.e. there can be a difference between the "real" state of the element and the return value.

  Specified by:
    `isReadOnly` in interface `IDocumentProviderExtension`
  Parameters:
    `element` - the element
  Returns:
    `true` if the given element is read-only, `false` otherwise

### isModifiable

    public boolean isModifiable(Object element)

  Description copied from interface: `IDocumentProviderExtension`
  Returns whether the document provider thinks that the given element can persistently be modified. This is orthogonal to `isReadOnly` as read-only elements may be modifiable and writable elements may not be modifiable. If the given element is not connected to this document provider, the result is undefined. Document providers are allowed to use a cache to answer this question, i.e. there can be a difference between the "real" state of the element and the return value.

  Specified by:
    `isModifiable` in interface `IDocumentProviderExtension`
  Parameters:
    `element` - the element
  Returns:
    `true` if the given element is modifiable, `false` otherwise

### validateState

    public void validateState(Object element,
                              Object computationContext)
                       throws CoreException

  Description copied from interface: `IDocumentProviderExtension`
  Validates the state of the given element. This method may change the "real" state of the element. If using, it also updates the internal caches, so that this method may also change the results returned by `isReadOnly` and `isModifiable`. If the given element is not connected to this document provider, the effect is undefined.

  Specified by:
    `validateState` in interface `IDocumentProviderExtension`
  Parameters:
    `element` - the element
    `computationContext` - the context in which the computation is performed, e.g., a SWT shell
  Throws:
    `CoreException` - if validating fails

### isStateValidated

    public boolean isStateValidated(Object element)

  Description copied from interface: `IDocumentProviderExtension`
  Returns whether the state of the given element has been validated.

  Specified by:
    `isStateValidated` in interface `IDocumentProviderExtension`
  Parameters:
    `element` - the element
  Returns:
    `true` if the state has been validated

### updateStateCache

    public void updateStateCache(Object element)
                          throws CoreException

  Description copied from interface: `IDocumentProviderExtension`
  Updates the state cache for the given element. This method may change the result returned by `isReadOnly` and `isModifiable`. If the given element is not connected to this document provider, the effect is undefined.

  Specified by:
    `updateStateCache` in interface `IDocumentProviderExtension`
  Parameters:
    `element` - the element
  Throws:
    `CoreException` - if validating fails

### setCanSaveDocument

    public void setCanSaveDocument(Object element)

  Description copied from interface: `IDocumentProviderExtension`
  Marks the document managed for the given element as saveable. I.e. `canBeSaved(element)` will return `true` afterwards.

  Specified by:
    `setCanSaveDocument` in interface `IDocumentProviderExtension`
  Parameters:
    `element` - the element

### getStatus

    public IStatus getStatus(Object element)

  Description copied from interface: `IDocumentProviderExtension`
  Returns the status of the given element.

  Specified by:
    `getStatus` in interface `IDocumentProviderExtension`
  Parameters:
    `element` - the element
  Returns:
    the status of the given element

### synchronize

    public void synchronize(Object element)
                     throws CoreException

  Description copied from interface: `IDocumentProviderExtension`
  Synchronizes the document provided for the given element with the given element. After that call `getSynchronizationTimeStamp` and `getModificationTimeStamp` return the same value.

  Specified by:
    `synchronize` in interface `IDocumentProviderExtension`
  Parameters:
    `element` - the element
  Throws:
    `CoreException` - if the synchronization could not be performed

### setProgressMonitor

    public void setProgressMonitor(IProgressMonitor progressMonitor)

  Description copied from interface: `IDocumentProviderExtension2`
  Sets this providers progress monitor.

  Specified by:
    `setProgressMonitor` in interface `IDocumentProviderExtension2`
  Parameters:
    `progressMonitor` -

### getProgressMonitor

    public IProgressMonitor getProgressMonitor()

  Description copied from interface: `IDocumentProviderExtension2`
  Returns this providers progress monitor.

  Specified by:
    `getProgressMonitor` in interface `IDocumentProviderExtension2`
  Returns:
    IProgressMonitor

### isSynchronized

    public boolean isSynchronized(Object element)

  Description copied from interface: `IDocumentProviderExtension3`
  Returns whether the information provided for the given element is in sync with the element.

  Specified by:
    `isSynchronized` in interface `IDocumentProviderExtension3`
  Parameters:
    `element` - the element
  Returns:
    `true` if the information is in sync with the element, `false` otherwise

### getDefaultEncoding

    public String getDefaultEncoding()

  Description copied from interface: `IStorageDocumentProvider`
  Returns the default character encoding used by this provider.

  Specified by:
    `getDefaultEncoding` in interface `IStorageDocumentProvider`
  Returns:
    the default character encoding used by this provider

### getEncoding

    public String getEncoding(Object element)

  Description copied from interface: `IStorageDocumentProvider`
  Returns the character encoding for the given element, or `null` if the element is not managed by this provider.

  Specified by:
    `getEncoding` in interface `IStorageDocumentProvider`
  Parameters:
    `element` - the element
  Returns:
    the encoding for the given element

### setEncoding

    public void setEncoding(Object element,
                            String encoding)

  Description copied from interface: `IStorageDocumentProvider`
  Sets the encoding for the given element. If `encoding` is `null` the workbench's character encoding should be used.

  Specified by:
    `setEncoding` in interface `IStorageDocumentProvider`
  Parameters:
    `element` - the element
    `encoding` - the encoding to be used

### handleCoreException

    protected void handleCoreException(CoreException exception,
                                       String message)

  Defines the standard procedure to handle `CoreExceptions`. Exceptions are written to the plug-in log.

  Parameters:
    `exception` - the exception to be logged
    `message` - the message to be logged

### getSystemFile

    protected File getSystemFile(TextFileDocumentProvider.FileInfo info)

  Returns the system file denoted by the given info.

  Parameters:
    `info` - the element's file info object
  Returns:
    the system for the given file info

### isSystemFileReadOnly

    protected boolean isSystemFileReadOnly(TextFileDocumentProvider.FileInfo info)

  Returns whether the system file denoted by the given info is read-only.

  Parameters:
    `info` - the element's file info object
  Returns:
    `true` iff read-only

### getFileInfo

    protected TextFileDocumentProvider.FileInfo getFileInfo(Object element)

  Returns the file info object for the given element.

  Parameters:
    `element` - the element
  Returns:
    the file info object, or `null` if none

### getConnectedElementsIterator

    protected Iterator getConnectedElementsIterator()

  Returns an iterator over the elements connected via this document provider.

  Returns:
    an iterator over the list of elements (element type: `Object`

### getFileInfosIterator

    protected Iterator getFileInfosIterator()

  Returns an iterator over this document provider's file info objects.

  Returns:
    the iterator over list of file info objects (element type: `TextFileDocumentProvider.FileInfo`

### fireElementStateChanging

    protected void fireElementStateChanging(Object element)

  Informs all registered element state listeners about the current state change of the element.

  Parameters:
    `element` - the element
  See Also:
    `IElementStateListenerExtension.elementStateChanging(Object)`

### fireElementStateChangeFailed

    protected void fireElementStateChangeFailed(Object element)

  Informs all registered element state listeners about the failed state change of the element.

  Parameters:
    `element` - the element
  See Also:
    `IElementStateListenerExtension.elementStateChangeFailed(Object)`

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