Package org.eclipse.handly.xtext.ui.editor

## Interface IHandlyXtextDocument

- All Superinterfaces:
    `org.eclipse.jface.text.IDocument`, `org.eclipse.jface.text.IDocumentExtension3`, `org.eclipse.xtext.util.concurrent.IReadAccess<org.eclipse.xtext.resource.XtextResource>`, `org.eclipse.xtext.util.concurrent.IReadAccess.Priority<org.eclipse.xtext.resource.XtextResource>`, `org.eclipse.xtext.util.concurrent.IWriteAccess<org.eclipse.xtext.resource.XtextResource>`, `org.eclipse.xtext.ui.editor.model.IXtextDocument`
  All Known Implementing Classes:
    `HandlyXtextDocument`

      public interface IHandlyXtextDocument
      extends org.eclipse.xtext.ui.editor.model.IXtextDocument

  Handly extension interface for `IXtextDocument`.
  Restriction:
    This interface is not intended to be extended by clients.
  Restriction:
    This interface is not intended to be implemented by clients.

- - ### Nested Class Summary

    Nested Classes
    Modifier and Type | Interface | Description
    --- | --- | ---
    `static interface` | `IHandlyXtextDocument.IUndoableUnitOfWork<R,​P>` | Represents an undoable unit of work.

    - ### Nested classes/interfaces inherited from interface org.eclipse.xtext.util.concurrent.IReadAccess

      `org.eclipse.xtext.util.concurrent.IReadAccess.Priority<State extends java.lang.Object>`

  - ### Field Summary

    - ### Fields inherited from interface org.eclipse.jface.text.IDocument

      `DEFAULT_CATEGORY, DEFAULT_CONTENT_TYPE`

    - ### Fields inherited from interface org.eclipse.jface.text.IDocumentExtension3

      `DEFAULT_PARTITIONING`

  - ### Method Summary

    All Methods Instance Methods Abstract Methods
    Modifier and Type | Method | Description
    --- | --- | ---
    `IDocumentChange` | `applyChange​(IDocumentChange change)` | Applies the given change to this document.
    `ISnapshot` | `getReconciledSnapshot()` | Returns the document snapshot that the document model was most recently `reconciled` with.
    `<T> T` | `modify​(org.eclipse.xtext.util.concurrent.IUnitOfWork<T,​org.eclipse.xtext.resource.XtextResource> work)` | Executes the given unit of work under the document's write lock.
    `boolean` | `needsReconciling()` | Returns whether the document model is out of sync with the document text and needs to be `reconciled`.
    `<T> T` | `readOnly​(org.eclipse.xtext.util.concurrent.IUnitOfWork<T,​org.eclipse.xtext.resource.XtextResource> work)` | Executes the given unit of work under the document's read lock.
    `void` | `reconcile​(boolean force, org.eclipse.core.runtime.IProgressMonitor monitor)` | Reconciles the document model so it is up to date again.

    - ### Methods inherited from interface org.eclipse.jface.text.IDocument

      `addDocumentListener, addDocumentPartitioningListener, addPosition, addPosition, addPositionCategory, addPositionUpdater, addPrenotifiedDocumentListener, computeIndexInCategory, computeNumberOfLines, computePartitioning, containsPosition, containsPositionCategory, get, get, getChar, getContentType, getDocumentPartitioner, getLegalContentTypes, getLegalLineDelimiters, getLength, getLineDelimiter, getLineInformation, getLineInformationOfOffset, getLineLength, getLineOffset, getLineOfOffset, getNumberOfLines, getNumberOfLines, getPartition, getPositionCategories, getPositions, getPositionUpdaters, insertPositionUpdater, removeDocumentListener, removeDocumentPartitioningListener, removePosition, removePosition, removePositionCategory, removePositionUpdater, removePrenotifiedDocumentListener, replace, search, set, setDocumentPartitioner`

    - ### Methods inherited from interface org.eclipse.jface.text.IDocumentExtension3

      `computePartitioning, getContentType, getDocumentPartitioner, getLegalContentTypes, getPartition, getPartitionings, setDocumentPartitioner`

    - ### Methods inherited from interface org.eclipse.xtext.util.concurrent.IReadAccess

      `tryReadOnly, tryReadOnly, tryReadOnly`

    - ### Methods inherited from interface org.eclipse.xtext.util.concurrent.IReadAccess.Priority

      `priorityReadOnly, tryPriorityReadOnly, tryPriorityReadOnly, tryPriorityReadOnly`

    - ### Methods inherited from interface org.eclipse.xtext.util.concurrent.IWriteAccess

      `tryModify, tryModify, tryModify`

    - ### Methods inherited from interface org.eclipse.xtext.ui.editor.model.IXtextDocument

      `addModelListener, addXtextDocumentContentObserver, getAdapter, getResourceURI, removeModelListener, removeXtextDocumentContentObserver`

- - ### Method Detail

    - #### needsReconciling

          boolean needsReconciling()

      Returns whether the document model is out of sync with the document text and needs to be `reconciled`.
      Returns:
        `true` if reconciling is needed, and `false` otherwise

    - #### reconcile

          void reconcile​(boolean force,
                         org.eclipse.core.runtime.IProgressMonitor monitor)

      Reconciles the document model so it is up to date again.

      Note that a document model with cross-document references may become out of date even when it is in sync with the document text. The `force` parameter controls whether the document model has to be reconciled even if it is already in sync with the document text.

      Parameters:
        `force` - controls whether the document model has to be reconciled even if it is already in sync with the the document text
        `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.OperationCanceledException` - if this method is canceled
        `NoXtextResourceException` - if `force` is `true` and the document has no Xtext resource (i.e., either the resource has yet to be set or it has already been disposed)

    - #### getReconciledSnapshot

          ISnapshot getReconciledSnapshot()

      Returns the document snapshot that the document model was most recently `reconciled` with. Returns `null` if this document has no Xtext resource (i.e., either the resource has yet to be set or it has already been disposed).
      Returns:
        the most recently reconciled snapshot, or `null`

    - #### readOnly

          <T> T readOnly​(org.eclipse.xtext.util.concurrent.IUnitOfWork<T,​org.eclipse.xtext.resource.XtextResource> work)

      Executes the given unit of work under the document's read lock. The unit of work must not modify the Xtext resource or expose any references to it. Read-only units of work may nest into each other.

      While inside the dynamic context of the unit of work, the Xtext resource is guaranteed to be based on the most recently `reconciled snapshot`. Usually, there is no need for clients to invoke `reconcile` before calling this method to ensure a fresh snapshot; reconciling happens automatically before the top-level unit of work is run.

      Specified by:
        `readOnly` in interface `org.eclipse.xtext.util.concurrent.IReadAccess<org.eclipse.xtext.resource.XtextResource>`
      Parameters:
        `work` - a read-only unit of work (not `null`)
      Returns:
        the unit of work's result (may be `null`). Must not contain any references to the Xtext resource or its contents (semantic objects or parse tree nodes)

    - #### modify

          <T> T modify​(org.eclipse.xtext.util.concurrent.IUnitOfWork<T,​org.eclipse.xtext.resource.XtextResource> work)

      Executes the given unit of work under the document's write lock. The unit of work may modify the Xtext resource but must not expose any references to it.

      The document text is automatically updated so it is reconciled with the resource modifications performed by the unit of work. Units of work may be nested; changes are only applied to the document after successful completion of the top-level modification, i.e., when all work is done. If the top-level unit of work is `undoable`, it will be `informed` of an undo change that can be `applied` to the document to revert any modifications made by the whole transaction.

      Before the top-level unit of work is run, the Xtext resource is guaranteed to be based on the most recently `reconciled snapshot`. That snapshot is regarded as the base snapshot for the whole transaction, i.e., if it turns out to be stale when changes are to be applied to the document, this method will throw a `StaleSnapshotException`. Usually, there is no need for clients to invoke `reconcile` before calling this method to ensure a fresh snapshot; reconciling happens automatically before the top-level unit of work is run.

      Specified by:
        `modify` in interface `org.eclipse.xtext.util.concurrent.IWriteAccess<org.eclipse.xtext.resource.XtextResource>`
      Parameters:
        `work` - a modifying unit of work (not `null`)
      Returns:
        the unit of work's result (may be `null`). Must not contain any references to the Xtext resource or its contents (semantic objects or parse tree nodes)
      Throws:
        `StaleSnapshotException` - if the document text has changed since the inception of the transaction's base snapshot

    - #### applyChange

          IDocumentChange applyChange​(IDocumentChange change)
                               throws org.eclipse.jface.text.BadLocationException

      Applies the given change to this document.

      Note that an update conflict may occur if the document text has changed since the inception of the snapshot on which the given change is based. In that case, a `StaleSnapshotException` is thrown.

      Parameters:
        `change` - a document change (not `null`)
      Returns:
        undo change, if requested by the given change. Otherwise, `null`
      Throws:
        `StaleSnapshotException` - if the document text has changed since the inception of the snapshot on which the given change is based
        `org.eclipse.text.edits.MalformedTreeException` - if the change's edit tree is not in a valid state
        `org.eclipse.jface.text.BadLocationException` - if one of the edits in the change's edit tree could not be executed