Class TextEdit
- java.lang.Object
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- org.eclipse.text.edits.TextEdit
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- Direct Known Subclasses:
CopyingRangeMarker,CopySourceEdit,CopyTargetEdit,DeleteEdit,InsertEdit,MoveSourceEdit,MoveTargetEdit,MultiTextEdit,RangeMarker,ReplaceEdit,UndoEdit
public abstract class TextEdit extends Object
A text edit describes an elementary text manipulation operation. Edits are executed by applying them to a document (e.g. an instance ofIDocument).Text edits form a tree. Clients can navigate the tree upwards, from child to parent, as well as downwards. Newly created edits are un-parented. New edits are added to the tree by calling one of the
addmethods on a parent edit.An edit tree is well formed in the following sense:
- a parent edit covers all its children
- children don't overlap
- an edit with length 0 can't have any children
Any manipulation of the tree that violates one of the above requirements results in a
MalformedTreeException.Insert edits are represented by an edit of length 0. If more than one insert edit exists at the same offset then the edits are executed in the order in which they have been added to a parent. The following code example:
IDocument document= new Document("org"); MultiTextEdit edit= new MultiTextEdit(); edit.addChild(new InsertEdit(0, "www.")); edit.addChild(new InsertEdit(0, "eclipse.")); edit.apply(document);therefore results in string: "www.eclipse.org".
Text edits can be executed in a mode where the edit's region is updated to reflect the edit's position in the changed document. Region updating is enabled by default or can be requested by passing
This class isn't intended to be subclassed outside of the edit framework. Clients are only allowed to subclassUPDATE_REGIONSto theapply(IDocument, int)method. In the above example the region of theInsertEdit(0, "eclipse.")edit after executing the root edit is[3, 8]. If the region of an edit got deleted during change execution the region is set to[-1, -1]and the methodisDeletedreturnstrue.MultiTextEdit.- Since:
- 3.0
- Restriction:
- This class is not intended to be subclassed by clients.
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Field Summary
Fields Modifier and Type Field Description static intCREATE_UNDOFlags indicating that applying an edit tree to a document is supposed to create a corresponding undo edit.static intNONEFlags indicating that neitherCREATE_UNDOnorUPDATE_REGIONSis set.static intUPDATE_REGIONSFlag indicating that the edit's region will be updated to reflect its position in the changed document.
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Method Summary
All Methods Static Methods Instance Methods Abstract Methods Concrete Methods Modifier and Type Method Description voidaccept(TextEditVisitor visitor)Accepts the given visitor on a visit of the current edit.protected abstract voidaccept0(TextEditVisitor visitor)Accepts the given visitor on a type-specific visit of the current edit.protected voidacceptChildren(TextEditVisitor visitor)Accepts the given visitor on the edits children.voidaddChild(TextEdit child)Adds the given editchildto this edit.voidaddChildren(TextEdit[] edits)Adds all edits ineditsto this edit.UndoEditapply(IDocument document)Applies the edit tree rooted by this edit to the given document.UndoEditapply(IDocument document, int style)Applies the edit tree rooted by this edit to the given document.protected booleancanZeroLengthCover()Returnstrueif an edit with length zero can cover another edit.protected voidchildDocumentUpdated()Hook method called when the document updating of a child edit has been completed.protected voidchildRegionUpdated()Hook method called when the region updating of a child edit has been completed.TextEditcopy()Creates a deep copy of the edit tree rooted at this edit.booleancovers(TextEdit other)Returnstrueif the edit covers the given editother.protected abstract TextEditdoCopy()Creates and returns a copy of this edit.booleanequals(Object obj)TheEditimplementation of thisObjectmethod uses object identity (==).TextEdit[]getChildren()Returns the edit's children.intgetChildrenSize()Returns the size of the managed children.static IRegiongetCoverage(TextEdit[] edits)Returns the text range spawned by the given array of text edits.intgetExclusiveEnd()Returns the exclusive end position of this edit.intgetInclusiveEnd()Returns the inclusive end position of this edit.intgetLength()Returns the length of the edit.intgetOffset()Returns the offset of the edit.TextEditgetParent()Returns the edit's parent.IRegiongetRegion()Returns the range that this edit is manipulating.TextEditgetRoot()Returns the root edit of the edit tree.booleanhasChildren()Returnstrueif this edit has children.inthashCode()TheEditimplementation of thisObjectmethod calls usesObject#hashCode()to compute its hash code.booleanisDeleted()Returns whether this edit has been deleted or not.voidmoveTree(int delta)Move all offsets in the tree by the given delta.protected voidpostProcessCopy(TextEditCopier copier)This method is called on every edit of the copied tree to do some post-processing like connected an edit to a different edit in the tree.TextEditremoveChild(int index)Removes the edit specified by the given index from the list of children.booleanremoveChild(TextEdit child)Removes the first occurrence of the given child from the list of children.TextEdit[]removeChildren()Removes all child edits from and returns them.StringtoString()
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Field Detail
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NONE
public static final int NONE
Flags indicating that neitherCREATE_UNDOnorUPDATE_REGIONSis set.- See Also:
- Constant Field Values
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CREATE_UNDO
public static final int CREATE_UNDO
Flags indicating that applying an edit tree to a document is supposed to create a corresponding undo edit. If not specifiednullis returned from methodapply.- See Also:
- Constant Field Values
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UPDATE_REGIONS
public static final int UPDATE_REGIONS
Flag indicating that the edit's region will be updated to reflect its position in the changed document. If not specified when applying an edit tree to a document the edit's region will be arbitrary. It is even not guaranteed that the tree is still well formed.- See Also:
- Constant Field Values
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Constructor Detail
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TextEdit
protected TextEdit(int offset, int length)Create a new text edit. Parent is initialized tonulland the edit doesn't have any children.- Parameters:
offset- the edit's offsetlength- the edit's length
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TextEdit
protected TextEdit(TextEdit source)
Copy constructor- Parameters:
source- the source to copy form
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Method Detail
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getRegion
public final IRegion getRegion()
Returns the range that this edit is manipulating. The returnedIRegioncontains the edit's offset and length at the point in time when this call is made. Any subsequent changes to the edit's offset and length aren't reflected in the returned region object.Creating a region for a deleted edit will result in an assertion failure.
- Returns:
- the manipulated region
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getOffset
public int getOffset()
Returns the offset of the edit. An offset is a 0-based character index. Returns-1if the edit is marked as deleted.- Returns:
- the offset of the edit
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getLength
public int getLength()
Returns the length of the edit. Returns-1if the edit is marked as deleted.- Returns:
- the length of the edit
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getInclusiveEnd
public final int getInclusiveEnd()
Returns the inclusive end position of this edit. The inclusive end position denotes the last character of the region manipulated by this edit. The returned value is the result of the following calculation:getOffset() + getLength() - 1;
- Returns:
- the inclusive end position
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getExclusiveEnd
public final int getExclusiveEnd()
Returns the exclusive end position of this edit. The exclusive end position denotes the next character of the region manipulated by this edit. The returned value is the result of the following calculation:getOffset() + getLength();
- Returns:
- the exclusive end position
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isDeleted
public final boolean isDeleted()
Returns whether this edit has been deleted or not.- Returns:
trueif the edit has been deleted; otherwisefalseis returned.
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moveTree
public final void moveTree(int delta)
Move all offsets in the tree by the given delta. This node must be a root node. The resulting offsets must be greater or equal to zero.- Parameters:
delta- the delta- Since:
- 3.1
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covers
public boolean covers(TextEdit other)
Returnstrueif the edit covers the given editother. It is up to the concrete text edit to decide if a edit of length zero can cover another edit.- Parameters:
other- the other edit- Returns:
trueif the edit covers the other edit; otherwisefalseis returned.
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canZeroLengthCover
protected boolean canZeroLengthCover()
Returnstrueif an edit with length zero can cover another edit. Returnsfalseotherwise.- Returns:
- whether an edit of length zero can cover another edit
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getParent
public final TextEdit getParent()
Returns the edit's parent. The method returnsnullif this edit hasn't been add to another edit.- Returns:
- the edit's parent
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getRoot
public final TextEdit getRoot()
Returns the root edit of the edit tree.- Returns:
- the root edit of the edit tree
- Since:
- 3.1
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addChild
public final void addChild(TextEdit child) throws MalformedTreeException
Adds the given editchildto this edit.- Parameters:
child- the child edit to add- Throws:
MalformedTreeException- is thrown if the child edit can't be added to this edit. This is the case if the child overlaps with one of its siblings or if the child edit's region isn't fully covered by this edit.
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addChildren
public final void addChildren(TextEdit[] edits) throws MalformedTreeException
Adds all edits ineditsto this edit.- Parameters:
edits- the text edits to add- Throws:
MalformedTreeException- is thrown if one of the given edits can't be added to this edit.- See Also:
addChild(TextEdit)
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removeChild
public final TextEdit removeChild(int index)
Removes the edit specified by the given index from the list of children. Returns the child edit that was removed from the list of children. The parent of the returned edit is set tonull.- Parameters:
index- the index of the edit to remove- Returns:
- the removed edit
- Throws:
IndexOutOfBoundsException- if the index is out of range
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removeChild
public final boolean removeChild(TextEdit child)
Removes the first occurrence of the given child from the list of children.- Parameters:
child- the child to be removed- Returns:
trueif the edit contained the given child; otherwisefalseis returned
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removeChildren
public final TextEdit[] removeChildren()
Removes all child edits from and returns them. The parent of the removed edits is set tonull.- Returns:
- an array of the removed edits
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hasChildren
public final boolean hasChildren()
Returnstrueif this edit has children. Otherwisefalseis returned.- Returns:
trueif this edit has children; otherwisefalseis returned
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getChildren
public final TextEdit[] getChildren()
Returns the edit's children. If the edit doesn't have any children an empty array is returned.- Returns:
- the edit's children
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getChildrenSize
public final int getChildrenSize()
Returns the size of the managed children.- Returns:
- the size of the children
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getCoverage
public static IRegion getCoverage(TextEdit[] edits)
Returns the text range spawned by the given array of text edits. The method requires that the given array contains at least one edit. If all edits passed are deleted the method returnsnull.- Parameters:
edits- an array of edits- Returns:
- the text range spawned by the given array of edits or
nullif all edits are marked as deleted
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equals
public final boolean equals(Object obj)
TheEditimplementation of thisObjectmethod uses object identity (==).- Overrides:
equalsin classObject- Parameters:
obj- the other object- Returns:
trueiffthis == obj; otherwisefalseis returned- See Also:
Object.equals(java.lang.Object)
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hashCode
public final int hashCode()
TheEditimplementation of thisObjectmethod calls usesObject#hashCode()to compute its hash code.- Overrides:
hashCodein classObject- Returns:
- the object's hash code value
- See Also:
Object.hashCode()
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copy
public final TextEdit copy()
Creates a deep copy of the edit tree rooted at this edit.- Returns:
- a deep copy of the edit tree
- See Also:
doCopy()
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doCopy
protected abstract TextEdit doCopy()
Creates and returns a copy of this edit. The copy method should be implemented in a way so that the copy can executed without causing any harm to the original edit. Implementors of this method are responsible for creating deep or shallow copies of referenced object to fulfill this requirement.Implementers of this method should use the copy constructor
This method should not be called from outside the framework. Please useEdit#Edit(Edit source) to initialize the edit part of the copy. Implementors aren't responsible to actually copy the children or to set the right parent.copyto create a copy of a edit tree.- Returns:
- a copy of this edit.
- See Also:
copy(),postProcessCopy(TextEditCopier),TextEditCopier
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postProcessCopy
protected void postProcessCopy(TextEditCopier copier)
This method is called on every edit of the copied tree to do some post-processing like connected an edit to a different edit in the tree.This default implementation does nothing
- Parameters:
copier- the copier that manages a map between original and copied edit.- See Also:
TextEditCopier
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accept
public final void accept(TextEditVisitor visitor)
Accepts the given visitor on a visit of the current edit.- Parameters:
visitor- the visitor object- Throws:
IllegalArgumentException- if the visitor is null
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accept0
protected abstract void accept0(TextEditVisitor visitor)
Accepts the given visitor on a type-specific visit of the current edit. This method must be implemented in all concrete text edits.General template for implementation on each concrete TextEdit class:
Note that the caller (boolean visitChildren= visitor.visit(this); if (visitChildren) { acceptChildren(visitor); }accept) takes care of invokingvisitor.preVisit(this)andvisitor.postVisit(this).- Parameters:
visitor- the visitor object
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acceptChildren
protected final void acceptChildren(TextEditVisitor visitor)
Accepts the given visitor on the edits children.This method must be used by the concrete implementations of
acceptto traverse list-values properties; it encapsulates the proper handling of on-the-fly changes to the list.- Parameters:
visitor- the visitor object
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apply
public final UndoEdit apply(IDocument document, int style) throws MalformedTreeException, BadLocationException
Applies the edit tree rooted by this edit to the given document. To check if the edit tree can be applied to the document either catchMalformedTreeExceptionor useTextEditProcessorto execute an edit tree.- Parameters:
document- the document to be manipulatedstyle- flags controlling the execution of the edit tree. Valid flags are:CREATE_UNDOandUPDATE_REGIONS.- Returns:
- a undo edit, if
CREATE_UNDOis specified. Otherwisenullis returned. - Throws:
MalformedTreeException- is thrown if the tree isn't in a valid state. This exception is thrown before any edit is executed. So the document is still in its original state.BadLocationException- is thrown if one of the edits in the tree can't be executed. The state of the document is undefined if this exception is thrown.- See Also:
TextEditProcessor.performEdits()
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apply
public final UndoEdit apply(IDocument document) throws MalformedTreeException, BadLocationException
Applies the edit tree rooted by this edit to the given document. This method is a convenience method forapply(document, CREATE_UNDO | UPDATE_REGIONS)- Parameters:
document- the document to which to apply this edit- Returns:
- a undo edit, if
CREATE_UNDOis specified. Otherwisenullis returned. - Throws:
MalformedTreeException- is thrown if the tree isn't in a valid state. This exception is thrown before any edit is executed. So the document is still in its original state.BadLocationException- is thrown if one of the edits in the tree can't be executed. The state of the document is undefined if this exception is thrown.- See Also:
apply(IDocument, int)
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childDocumentUpdated
protected void childDocumentUpdated()
Hook method called when the document updating of a child edit has been completed. When a client callsapply(IDocument)orapply(IDocument, int)this method is calledgetChildrenSize()times.May be overridden by subclasses of
MultiTextEdit.- Since:
- 3.1
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childRegionUpdated
protected void childRegionUpdated()
Hook method called when the region updating of a child edit has been completed. When a client callsapply(IDocument)this method is calledgetChildrenSize()times. When callingapply(IDocument, int)this method is calledgetChildrenSize()times, when the style parameter contains theUPDATE_REGIONSflag.May be overridden by subclasses of
MultiTextEdit.- Since:
- 3.1
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