org.eclipse.jface.text.DefaultDocumentAdapter Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of org.eclipse.jface.text Show documentation
This is org.eclipse.jface.text jar used by Scout SDK
The newest version!
/*******************************************************************************
 * Copyright (c) 2000, 2007 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.jface.text;


import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.TextChangeListener;
import org.eclipse.swt.custom.TextChangedEvent;
import org.eclipse.swt.custom.TextChangingEvent;

import org.eclipse.core.runtime.Assert;


/**
 * Default implementation of {@link org.eclipse.jface.text.IDocumentAdapter}.
 * 
 * Note: This adapter does not work if the widget auto-wraps the text.
 * 
 */
class DefaultDocumentAdapter implements IDocumentAdapter, IDocumentListener, IDocumentAdapterExtension {

	/** The adapted document. */
	private IDocument fDocument;
	/** The document clone for the non-forwarding case. */
	private IDocument fDocumentClone;
	/** The original content */
	private String fOriginalContent;
	/** The original line delimiters */
	private String[] fOriginalLineDelimiters;
	/** The registered text change listeners */
	private List fTextChangeListeners= new ArrayList<>(1);
	/**
	 * The remembered document event
	 * @since 2.0
	 */
	private DocumentEvent fEvent;
	/** The line delimiter */
	private String fLineDelimiter= null;
	/**
	 * Indicates whether this adapter is forwarding document changes
	 * @since 2.0
	 */
	private boolean fIsForwarding= true;
	/**
	 * Length of document at receipt of documentAboutToBeChanged
	 * @since 2.1
	 */
	private int fRememberedLengthOfDocument;
	/**
	 * Length of first document line at receipt of documentAboutToBeChanged
	 * @since 2.1
	 */
	private int fRememberedLengthOfFirstLine;
	/**
	 * The data of the event at receipt of documentAboutToBeChanged
	 * @since 2.1
	 */
	private  DocumentEvent fOriginalEvent= new DocumentEvent();


	/**
	 * Creates a new document adapter which is initially not connected to
	 * any document.
	 */
	public DefaultDocumentAdapter() {
	}

	/**
	 * Sets the given document as the document to be adapted.
	 *
	 * @param document the document to be adapted or null if there is no document
	 */
	@Override
	public void setDocument(IDocument document) {

		if (fDocument != null)
			fDocument.removePrenotifiedDocumentListener(this);

		fDocument= document;
		fLineDelimiter= null;

		if (!fIsForwarding) {
			fDocumentClone= null;
			if (fDocument != null) {
				fOriginalContent= fDocument.get();
				fOriginalLineDelimiters= fDocument.getLegalLineDelimiters();
			} else {
				fOriginalContent= null;
				fOriginalLineDelimiters= null;
			}
		}

		if (fDocument != null)
			fDocument.addPrenotifiedDocumentListener(this);
	}

	@Override
	public void addTextChangeListener(TextChangeListener listener) {
		Assert.isNotNull(listener);
		if (!fTextChangeListeners.contains(listener))
			fTextChangeListeners.add(listener);
	}

	@Override
	public void removeTextChangeListener(TextChangeListener listener) {
		Assert.isNotNull(listener);
		fTextChangeListeners.remove(listener);
	}

	/**
	 * Tries to repair the line information.
	 *
	 * @param document the document
	 * @see IRepairableDocument#repairLineInformation()
	 * @since 3.0
	 */
	private void repairLineInformation(IDocument document) {
		if (document instanceof IRepairableDocument) {
			IRepairableDocument repairable= (IRepairableDocument) document;
			repairable.repairLineInformation();
		}
	}

	/**
	 * Returns the line for the given line number.
	 *
	 * @param document the document
	 * @param line the line number
	 * @return the content of the line of the given number in the given document
	 * @throws BadLocationException if the line number is invalid for the adapted document
	 * @since 3.0
	 */
	private String doGetLine(IDocument document, int line) throws BadLocationException {
		IRegion r= document.getLineInformation(line);
		return document.get(r.getOffset(), r.getLength());
	}

	private IDocument getDocumentForRead() {
		if (!fIsForwarding) {
			if (fDocumentClone == null) {
				String content= fOriginalContent == null ? "" : fOriginalContent; //$NON-NLS-1$
				String[] delims= fOriginalLineDelimiters == null ? DefaultLineTracker.DELIMITERS : fOriginalLineDelimiters;
				fDocumentClone= new DocumentClone(content, delims);
			}
			return fDocumentClone;
		}

		return fDocument;
	}

	@Override
	public String getLine(int line) {

		IDocument document= getDocumentForRead();
		try {
			return doGetLine(document, line);
		} catch (BadLocationException x) {
			repairLineInformation(document);
			try {
				return doGetLine(document, line);
			} catch (BadLocationException x2) {
			}
		}

		SWT.error(SWT.ERROR_INVALID_ARGUMENT);
		return null;
	}

	@Override
	public int getLineAtOffset(int offset) {
		IDocument document= getDocumentForRead();
		try {
			return document.getLineOfOffset(offset);
		} catch (BadLocationException x) {
			repairLineInformation(document);
			try {
				return document.getLineOfOffset(offset);
			} catch (BadLocationException x2) {
			}
		}

		SWT.error(SWT.ERROR_INVALID_ARGUMENT);
		return -1;
	}

	@Override
	public int getLineCount() {
		return getDocumentForRead().getNumberOfLines();
	}

	@Override
	public int getOffsetAtLine(int line) {
		IDocument document= getDocumentForRead();
		try {
			return document.getLineOffset(line);
		} catch (BadLocationException x) {
			repairLineInformation(document);
			try {
				return document.getLineOffset(line);
			} catch (BadLocationException x2) {
			}
		}

		SWT.error(SWT.ERROR_INVALID_ARGUMENT);
		return -1;
	}

	@Override
	public String getTextRange(int offset, int length) {
		try {
			return getDocumentForRead().get(offset, length);
		} catch (BadLocationException x) {
			SWT.error(SWT.ERROR_INVALID_ARGUMENT);
			return null;
		}
	}

	@Override
	public void replaceTextRange(int pos, int length, String text) {
		try {
			fDocument.replace(pos, length, text);
		} catch (BadLocationException x) {
			SWT.error(SWT.ERROR_INVALID_ARGUMENT);
		}
	}

	@Override
	public void setText(String text) {
		fDocument.set(text);
	}

	@Override
	public int getCharCount() {
		return getDocumentForRead().getLength();
	}

	@Override
	public String getLineDelimiter() {
		if (fLineDelimiter == null)
			fLineDelimiter= TextUtilities.getDefaultLineDelimiter(fDocument);
		return fLineDelimiter;
	}

	@Override
	public void documentChanged(DocumentEvent event) {
		// check whether the given event is the one which was remembered
		if (fEvent == null || event != fEvent)
			return;

		if (isPatchedEvent(event) || (event.getOffset() == 0 && event.getLength() == fRememberedLengthOfDocument)) {
			fLineDelimiter= null;
			fireTextSet();
		} else {
			if (event.getOffset() < fRememberedLengthOfFirstLine)
				fLineDelimiter= null;
			fireTextChanged();
		}
	}

	@Override
	public void documentAboutToBeChanged(DocumentEvent event) {

		fRememberedLengthOfDocument= fDocument.getLength();
		try {
			fRememberedLengthOfFirstLine= fDocument.getLineLength(0);
		} catch (BadLocationException e) {
			fRememberedLengthOfFirstLine= -1;
		}

		fEvent= event;
		rememberEventData(fEvent);
		fireTextChanging();
	}

	/**
	 * Checks whether this event has been changed between documentAboutToBeChanged and
	 * documentChanged.
	 *
	 * @param event the event to be checked
	 * @return true if the event has been changed, false otherwise
	 */
	private boolean isPatchedEvent(DocumentEvent event) {
		return fOriginalEvent.fOffset != event.fOffset || fOriginalEvent.fLength != event.fLength || fOriginalEvent.fText != event.fText;
	}

	/**
	 * Makes a copy of the given event and remembers it.
	 *
	 * @param event the event to be copied
	 */
	private void rememberEventData(DocumentEvent event) {
		fOriginalEvent.fOffset= event.fOffset;
		fOriginalEvent.fLength= event.fLength;
		fOriginalEvent.fText= event.fText;
	}

	/**
	 * Sends a text changed event to all registered listeners.
	 */
	private void fireTextChanged() {

		if (!fIsForwarding)
			return;

		TextChangedEvent event= new TextChangedEvent(this);

		if (fTextChangeListeners != null && fTextChangeListeners.size() > 0) {
			Iterator e= new ArrayList<>(fTextChangeListeners).iterator();
			while (e.hasNext())
				e.next().textChanged(event);
		}
	}

	/**
	 * Sends a text set event to all registered listeners.
	 */
	private void fireTextSet() {

		if (!fIsForwarding)
			return;

		TextChangedEvent event = new TextChangedEvent(this);

		if (fTextChangeListeners != null && fTextChangeListeners.size() > 0) {
			Iterator e= new ArrayList<>(fTextChangeListeners).iterator();
			while (e.hasNext())
				e.next().textSet(event);
		}
	}

	/**
	 * Sends the text changing event to all registered listeners.
	 */
	private void fireTextChanging() {

		if (!fIsForwarding)
			return;

		try {
		    IDocument document= fEvent.getDocument();
		    if (document == null)
		    	return;

			TextChangingEvent event= new TextChangingEvent(this);
			event.start= fEvent.fOffset;
			event.replaceCharCount= fEvent.fLength;
			event.replaceLineCount= document.getNumberOfLines(fEvent.fOffset, fEvent.fLength) - 1;
			event.newText= fEvent.fText;
			event.newCharCount= (fEvent.fText == null ? 0 : fEvent.fText.length());
			event.newLineCount= (fEvent.fText == null ? 0 : document.computeNumberOfLines(fEvent.fText));

			if (fTextChangeListeners != null && fTextChangeListeners.size() > 0) {
				Iterator e= new ArrayList<>(fTextChangeListeners).iterator();
				while (e.hasNext())
					 e.next().textChanging(event);
			}

		} catch (BadLocationException e) {
		}
	}

	@Override
	public void resumeForwardingDocumentChanges() {
		fIsForwarding= true;
		fDocumentClone= null;
		fOriginalContent= null;
		fOriginalLineDelimiters= null;
		fireTextSet();
	}

	@Override
	public void stopForwardingDocumentChanges() {
		fDocumentClone= null;
		fOriginalContent= fDocument.get();
		fOriginalLineDelimiters= fDocument.getLegalLineDelimiters();
		fIsForwarding= false;
	}
}