/**
 * Similar to beginUpdate(), but this beings an *insignificant* edit--that is,
 * an edit that won't be considered a "step" in the undo/redo list, but will be
 * undone/redone when moving between significant steps.
 */
public synchronized void beginInsignificantUpdate() {
	if (insignificantLevel == 0) {
		insignificantEdit = new CompoundEdit() {
			/**
			 *                
			 */
			private static final long serialVersionUID = -7589808295352003936L;

			@Override
			public boolean isSignificant() {
				return false;
			}
		};

		insignificantLevel++;
	}
}
 

public void testTrivialChunk() throws Exception {
    content = "";
    StyledDocument d = support.openDocument();

    // same operations as testSingleChunk,
    // but don't test modified/canUndo/canRedo state

    CompoundEdit ce = beginChunk(d);
    d.insertString(d.getLength(), "a", null);
    d.insertString(d.getLength(), "b", null);
    endChunk(d, ce);

    assertEquals("data", "ab", d.getText(0, d.getLength()));

    ur().undo();
    assertEquals("after undo data", "", d.getText(0, d.getLength()));

    ur().redo();
    assertEquals("after redo data", "ab", d.getText(0, d.getLength()));
}
 

private CompoundEdit startCompoundEdit(UndoableEdit anEdit) {
	//  Track Caret and Document information of this compound edit

	lastOffset = textComponent.getCaretPosition();
	lastLength = textComponent.getDocument().getLength();

	//  The compound edit is used to store incremental edits
	compoundEdit = new MyCompoundEdit();
	compoundEdit.addEdit(anEdit);

	//  The compound edit is added to the UndoManager. All incremental
	//  edits stored in the compound edit will be undone/redone at once
	addEdit(compoundEdit);

	undoAction.updateUndoState();
	redoAction.updateRedoState();

	return compoundEdit;
}
 

private UndoableEditDelegate(UndoableEdit ed, BaseDocument doc, InstantRefactoringPerformer performer) {
    DataObject dob = (DataObject) doc.getProperty(BaseDocument.StreamDescriptionProperty);
    this.ces = dob.getLookup().lookup(CloneableEditorSupport.class);
    this.inner = new CompoundEdit();
    this.inner.addEdit(ed);
    this.delegate = ed;
    this.performer = performer;
}
 

public void testSingleChunk() throws Exception {
    content = "";
    StyledDocument d = support.openDocument();
    assertFalse("initially: not modified", support.isModified());
    assertFalse("initially: no undo", ur().canUndo());
    assertFalse("initially: no redo", ur().canRedo());

    CompoundEdit ce = beginChunk(d);
    assertFalse("start chunk: not modified", support.isModified());
    assertFalse("start chunk: no undo", ur().canUndo());
    assertFalse("start chunk: no redo", ur().canRedo());

    d.insertString(d.getLength(), "a", null);
    assertTrue("insert: modified", support.isModified());
    assertTrue("insert: can undo", ur().canUndo());
    assertFalse("insert: no redo", ur().canRedo());

    d.insertString(d.getLength(), "b", null);
    endChunk(d, ce);
    assertEquals("chunk: data", "ab", d.getText(0, d.getLength()));
    assertTrue("endChunk: modified", support.isModified());
    assertTrue("endChunk: can undo", ur().canUndo());
    assertFalse("endChunk: no redo", ur().canRedo());

    ur().undo();
    assertEquals("after undo: data", "", d.getText(0, d.getLength()));
    assertFalse("undo: not modified", support.isModified());
    assertFalse("undo: no undo", ur().canUndo());
    assertTrue("undo: can redo", ur().canRedo());

    ur().redo();
    assertEquals("after redo: data", "ab", d.getText(0, d.getLength()));
    assertTrue("redo: modified", support.isModified());
    assertTrue("redo: can undo", ur().canUndo());
    assertFalse("redo: no redo", ur().canRedo());
}
 

public void testNestedChunks() throws Exception {
    content = "";
    StyledDocument d = support.openDocument();
    CompoundEdit ce1 = beginChunk(d);
    d.insertString(d.getLength(), "a", null);
    d.insertString(d.getLength(), "b", null);

    CompoundEdit ce2 = beginChunk(d); // creates a separate undoable chunk

    d.insertString(d.getLength(), "c", null);
    d.insertString(d.getLength(), "d", null);

    endChunk(d, ce1);

    d.insertString(d.getLength(), "e", null);
    d.insertString(d.getLength(), "f", null);

    endChunk(d, ce2);

    assertEquals("data", "abcdef", d.getText(0, d.getLength()));

    // following fails if nesting not supported
    ur().undo();
    assertEquals("undo1", "abcd", d.getText(0, d.getLength()));

    ur().undo();
    assertEquals("undo2", "ab", d.getText(0, d.getLength()));

    ur().undo();
    assertEquals("undo3", "", d.getText(0, d.getLength()));
}
 

private UndoableEditDelegate(UndoableEdit ed, DataObject dob, RefactoringSession session) {
    undoManager = UndoManager.getDefault();
    ces = dob.getLookup().lookup(CloneableEditorSupport.class);
    //this.delegate = ed;
    this.inner = new CompoundEdit();
    inner.addEdit(ed);
    delegate = ed;
    this.session = session;
}
 

@Override public void replace(int offset, int length, String text, AttributeSet attrs) throws BadLocationException {
  if (length == 0) {
    // System.out.println("insert");
    super.replace(offset, length, text, attrs);
  } else {
    // System.out.println("replace");
    compoundEdit = new CompoundEdit();
    super.replace(offset, length, text, attrs);
    compoundEdit.end();
    super.fireUndoableEditUpdate(new UndoableEditEvent(this, compoundEdit));
    compoundEdit = null;
  }
}
 

@Override public void replace(DocumentFilter.FilterBypass fb, int offset, int length, String text, AttributeSet attrs) throws BadLocationException {
  if (length == 0) {
    fb.insertString(offset, text, attrs);
  } else {
    compoundEdit = new CompoundEdit();
    fb.replace(offset, length, text, attrs);
    compoundEdit.end();
    addEdit(compoundEdit);
    compoundEdit = null;
  }
}
 

private CompoundEdit startCompoundEdit(UndoableEdit anEdit) {
    //  Track Caret and Document information of this compound edit
    // AbstractDocument.DefaultDocumentEvent docEvt = (DefaultDocumentEvent) anEdit;

    //  The compound edit is used to store incremental edits
    compoundEdit = new MyCompoundEdit();
    compoundEdit.addEdit(anEdit);

    //  The compound edit is added to the UndoManager. All incremental
    //  edits stored in the compound edit will be undone/redone at once
    addEdit(compoundEdit);

    return compoundEdit;
}
 

public void testDeleteEachTenthCharFromDocument() throws Exception {
    StringBuffer sb = new StringBuffer();
    for (int i = 0; i < 20; i++) {
        for (int j = 0; j < 10; j++) {
            sb.append((char)('0' + j));
        }
    }
    
    content = sb.toString();
    
    StyledDocument doc = support.openDocument();
    assertEquals("200 chars there", 200, doc.getLength());
    
    CompoundEdit bigEdit = new CompoundEdit();
    support.getUndoRedo().undoableEditHappened(new UndoableEditEvent(doc, bigEdit));
    
    assertTrue("Big edit will consume other edits", bigEdit.isInProgress());
    
    for (int i = 199; i >= 0; i -= 10) {
        doc.remove(i, 1);
    }
    
    assertTrue("Big edit was still in consume mode", bigEdit.isInProgress());
    bigEdit.end();
    assertFalse("Big edit is over", bigEdit.isInProgress());
    assertTrue("Document is modified", modified);
    assertTrue("We can undo", support.getUndoRedo().canUndo());
    
    if (doc.getText(0, doc.getLength()).indexOf('9') != -1) {
        fail("There should be no 9 in the doc:\n" + doc.getText(0, doc.getLength()));
    }
    
    support.getUndoRedo().undo();
    
    assertEquals("Again 200", 200, doc.getLength());
    assertFalse("Not modified anymore", modified);

    
    assertTrue("We can redo", support.getUndoRedo().canRedo());
    support.getUndoRedo().redo();
    
    assertTrue("Document is modified", modified);
    assertTrue("We can undo", support.getUndoRedo().canUndo());
    
    if (doc.getText(0, doc.getLength()).indexOf('9') != -1) {
        fail("There should be no 9 in the doc:\n" + doc.getText(0, doc.getLength()));
    }
    
}
 

public void testDeleteEachTenthCharOnModifiedDocument() throws Exception {
    
    StyledDocument doc = support.openDocument();
    StringBuffer sb = new StringBuffer();
    for (int i = 0; i < 20; i++) {
        for (int j = 0; j < 10; j++) {
            sb.append((char)('0' + j));
        }
    }
    assertEquals("empty", 0, doc.getLength());
    doc.insertString(0, sb.toString(), null);
    assertEquals("200 chars there", 200, doc.getLength());
    
    CompoundEdit bigEdit = new CompoundEdit();
    support.getUndoRedo().undoableEditHappened(new UndoableEditEvent(doc, bigEdit));
    
    assertTrue("Big edit will consume other edits", bigEdit.isInProgress());
    
    for (int i = 199; i >= 0; i -= 10) {
        doc.remove(i, 1);
    }
    
    assertTrue("Big edit was still in consume mode", bigEdit.isInProgress());
    bigEdit.end();
    assertFalse("Big edit is over", bigEdit.isInProgress());
    assertTrue("Document is modified", modified);
    assertTrue("We can undo", support.getUndoRedo().canUndo());
    
    if (doc.getText(0, doc.getLength()).indexOf('9') != -1) {
        fail("There should be no 9 in the doc:\n" + doc.getText(0, doc.getLength()));
    }
    
    support.getUndoRedo().undo();
    
    assertEquals("Again 200", 200, doc.getLength());
    assertTrue("Still modified", modified);

    
    assertTrue("We can redo", support.getUndoRedo().canRedo());
    support.getUndoRedo().redo();
    
    assertTrue("Document is modified", modified);
    assertTrue("We can undo", support.getUndoRedo().canUndo());
    
    if (doc.getText(0, doc.getLength()).indexOf('9') != -1) {
        fail("There should be no 9 in the doc:\n" + doc.getText(0, doc.getLength()));
    }
    
}
 

public void testUndoRedoUndoEdits() throws Exception {

        final StyledDocument d = support.openDocument();

        UndoRedo.Manager ur = support.getUndoRedo();
        UndoRedoManager urMgr = null;

        if (ur instanceof UndoRedoManager) {
            urMgr = (UndoRedoManager) ur;
        }

        d.insertString(d.getLength(), "a", null);
        final CompoundEdit bigEdit = new CompoundEdit();
        d.insertString(d.getLength(), "b", null);
        bigEdit.end();
        support.saveDocument();

        // setting the property to populate urMgr.onSaveTasksEdit field
        d.putProperty("beforeSaveRunnable", new Runnable() {

            public void run() {
                Runnable beforeSaveStart = (Runnable) d.getProperty("beforeSaveStart");
                if (beforeSaveStart != null) {
                    beforeSaveStart.run();
                    support.getUndoRedo().undoableEditHappened(new UndoableEditEvent(d, bigEdit));
                }
            }
        });

        urMgr.undo();
        support.saveDocument();
        d.putProperty("beforeSaveRunnable", null);
        assertEquals("after undo data", "a", d.getText(0, d.getLength()));

        urMgr.redo();
        support.saveDocument();
        assertEquals("after redo data", "ab", d.getText(0, d.getLength()));

        urMgr.undo();
        assertEquals("after redo data", "a", d.getText(0, d.getLength()));
    }
 

CompoundEdit beginChunk(Document d) {
    sendUndoableEdit(d, CloneableEditorSupport.BEGIN_COMMIT_GROUP);
    return null;
}
 

void endChunk(Document d, CompoundEdit ce) {
    sendUndoableEdit(d, CloneableEditorSupport.END_COMMIT_GROUP);
}
 

/** this also tests mixing regular and chunks */
public void testExtraEndChunk() throws Exception {
    content = "";
    StyledDocument d = support.openDocument();

    CompoundEdit ce = beginChunk(d);

    d.insertString(d.getLength(), "a", null);
    d.insertString(d.getLength(), "b", null);

    endChunk(d, ce);
    assertEquals("chunk: data", "ab", d.getText(0, d.getLength()));

    Level level = disableWarning();
    try {
        endChunk(d, ce);
        endChunk(d, ce);

        assertEquals("extraEnd: data", "ab", d.getText(0, d.getLength()));
        assertTrue("extraEnd: modified", support.isModified());
        assertTrue("extraEnd: can undo", ur().canUndo());
        assertFalse("extraEnd: no redo", ur().canRedo());

        d.insertString(d.getLength(), "c", null);
        d.insertString(d.getLength(), "d", null);
        endChunk(d, ce);
        assertEquals("extraEnd2: data", "abcd", d.getText(0, d.getLength()));
        ur().undo();
        endChunk(d, ce);
        if (!documentSupportsUndoMergingOfWords()) {
            assertEquals("undo1: data", "abc", d.getText(0, d.getLength()));
            ur().undo();
        }
        assertEquals("undo2: data", "ab", d.getText(0, d.getLength()));
        ur().undo();
        endChunk(d, ce);
        assertEquals("undo3: data", "", d.getText(0, d.getLength()));
        ur().redo();
        assertEquals("redo1: data", "ab", d.getText(0, d.getLength()));
        ur().redo();
        endChunk(d, ce);
        if (!documentSupportsUndoMergingOfWords()) {
            assertEquals("redo2: data", "abc", d.getText(0, d.getLength()));
            ur().redo();
        }
        assertEquals("redo3: data", "abcd", d.getText(0, d.getLength()));
    } finally {
        enableWarning(level);
    }
}
 

public void testUndoRedoWhileActiveChunk() throws Exception {
    content = "";
    StyledDocument d = support.openDocument();
    CompoundEdit ce = beginChunk(d);
    d.insertString(d.getLength(), "a", null);
    d.insertString(d.getLength(), "b", null);

    assertEquals("before undo: data", "ab", d.getText(0, d.getLength()));

    ur().undo();

    // These asserts assume that an undo in the middle of a chunk
    // is an undo on the whole chunk so far.

    assertEquals("after undo: data", "", d.getText(0, d.getLength()));
    assertFalse("after undo: not modified", support.isModified());
    assertFalse("after undo: no undo", ur().canUndo());
    assertTrue("after undo: can redo", ur().canRedo());

    // note still in the chunk.

    ur().redo();
    assertEquals("after redo: data", "ab", d.getText(0, d.getLength()));
    assertTrue("after redo: modified", support.isModified());
    assertTrue("after redo: can undo", ur().canUndo());
    assertFalse("after redo: no redo", ur().canRedo());

    ur().undo(); 
    assertEquals("after undo: data", "", d.getText(0, d.getLength()));

    // note still in the chunk.

    d.insertString(d.getLength(), "c", null);
    d.insertString(d.getLength(), "d", null);
    endChunk(d, ce);

    assertEquals("after endChunk: data", "cd", d.getText(0, d.getLength()));
    assertTrue("after endChunk: modified", support.isModified());
    assertTrue("after endChunk: can undo", ur().canUndo());
    assertFalse("after endChunk: no redo", ur().canRedo());

    
    ur().undo();
    assertEquals("undo after endChunk: data", "", d.getText(0, d.getLength()));
    assertFalse("undo after endChunk: not modified", support.isModified());
    assertFalse("undo after endChunk: no undo", ur().canUndo());
    assertTrue("undo after endChunk: can redo", ur().canRedo());
}
 

public void testSaveDocumentWhileActiveChunkCommon(boolean doFailCase) throws Exception {
    content = "";
    StyledDocument d = support.openDocument();
    CompoundEdit ce = beginChunk(d);
    d.insertString(d.getLength(), "a", null);
    d.insertString(d.getLength(), "b", null);

    support.saveDocument (); // creates a separate undoable chunk
    assertFalse("save: not modified", support.isModified());
    assertTrue("save: can undo", ur().canUndo());
    assertFalse("save: no redo", ur().canRedo());

    d.insertString(d.getLength(), "c", null);
    d.insertString(d.getLength(), "d", null);
    endChunk(d, ce);

    assertEquals("insert, after save: data", "abcd", d.getText(0, d.getLength()));
    assertTrue("insert, after save: modified", support.isModified());
    assertTrue("insert, after save: can undo", ur().canUndo());
    assertFalse("insert, after save: no redo", ur().canRedo());

    ur().undo();
    assertEquals("undo, at save: data", "ab", d.getText(0, d.getLength()));
    assertFalse("undo, at save: not modified", support.isModified());
    assertTrue("undo, at save: can undo", ur().canUndo());
    assertTrue("undo, at save: can redo", ur().canRedo());

    ur().undo();
    assertEquals("undo, before save: data", "", d.getText(0, d.getLength()));

    if(doFailCase) {
        // ****************************************************************
        // CES BUG???
        assertTrue("undo, before save: modified", support.isModified());
        // ****************************************************************
    }

    assertFalse("undo, before save: can undo", ur().canUndo());
    assertTrue("undo, before save: can redo", ur().canRedo());

    ur().redo();
    assertEquals("redo, at save: data", "ab", d.getText(0, d.getLength()));
    assertFalse("redo, at save: not modified", support.isModified());
    assertTrue("redo, at save: can undo", ur().canUndo());
    assertTrue("redo, at save: can redo", ur().canRedo());
}
 

protected CompoundEdit createModelUndoableEdit() {
    return new ModelUndoableEdit();
}
 

@Override
protected CompoundEdit createCompoundEdit() {
    return createModelUndoableEdit();
}
 

private CommandProcessor(){
    this.editor = new GUIEditor();
    list = new LinkedList<Command>();
    this.compoundEdit = new CompoundEdit();
}