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/*******************************************************************************
* Copyright (c) 2000, 2005 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.ui.editors.text;
import java.io.IOException;
import java.io.InputStream;
import org.eclipse.jface.text.Assert;
import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.DocumentEvent;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.IDocumentListener;
/**
* An <code>InputStream</code> that reads from an <code>IDocument</code>.
* The input stream ensures that its content is the same as the document
* content when the stream was created.
* <p>
* Note that {@link #close()} must be called to release any acquired
* resources.
* </p>
*
* @since 3.1
*/
class DocumentInputStream extends InputStream {
/**
* Document based character sequence.
*/
private static class DocumentCharSequence implements CharSequence {
/** Document */
private IDocument fDocument;
/**
* Initialize with the sequence of characters in the given
* document.
*
* @param document the document
*/
public DocumentCharSequence(IDocument document) {
fDocument= document;
}
/*
* @see java.lang.CharSequence#length()
*/
public int length() {
return fDocument.getLength();
}
/*
* @see java.lang.CharSequence#charAt(int)
*/
public char charAt(int index) {
try {
return fDocument.getChar(index);
} catch (BadLocationException x) {
throw new IndexOutOfBoundsException(x.getLocalizedMessage());
}
}
/*
* @see java.lang.CharSequence#subSequence(int, int)
*/
public CharSequence subSequence(int start, int end) {
try {
return fDocument.get(start, end - start);
} catch (BadLocationException x) {
throw new IndexOutOfBoundsException(x.getLocalizedMessage());
}
}
}
/**
* Internal document listener.
*/
private class InternalDocumentListener implements IDocumentListener {
/*
* @see org.eclipse.jface.text.IDocumentListener#documentAboutToBeChanged(org.eclipse.jface.text.DocumentEvent)
*/
public void documentAboutToBeChanged(DocumentEvent event) {
handleDocumentAboutToBeChanged();
}
/*
* @see org.eclipse.jface.text.IDocumentListener#documentChanged(org.eclipse.jface.text.DocumentEvent)
*/
public void documentChanged(DocumentEvent event) {
}
}
/** The character sequence. */
private volatile CharSequence fCharSequence;
/** Document length. */
private int fLength;
/** The current offset. */
private int fOffset= 0;
/** The document. */
private IDocument fDocument;
/** The document listener. */
private IDocumentListener fDocumentListener= new InternalDocumentListener();
/**
* Creates a new document input stream and initializes
* the stream to read from the given document.
*
* @param document the document
*/
public DocumentInputStream(IDocument document) {
Assert.isNotNull(document);
fDocument= document;
fCharSequence= new DocumentCharSequence(fDocument);
fDocument.addDocumentListener(fDocumentListener);
fLength= fCharSequence.length();
}
/*
* @see java.io.InputStream#read()
*/
public int read() throws IOException {
try {
return fOffset < fLength ? fCharSequence.charAt(fOffset++) : -1;
} catch (NullPointerException x) {
throw new IOException(TextEditorMessages.getString("DocumentInputStream.error.streamClosed")); //$NON-NLS-1$
} catch (IndexOutOfBoundsException x) {
throw new IOException(TextEditorMessages.getFormattedString("DocumentInputStream.error.read", x.getLocalizedMessage())); //$NON-NLS-1$
}
}
/*
* @see java.io.InputStream#close()
*/
public void close() throws IOException {
synchronized (this) {
fCharSequence= null;
}
releaseDocument();
}
/**
* Copies the document prior to modification and removes the document listener.
*/
private void handleDocumentAboutToBeChanged() {
IDocument document= fDocument;
if (fCharSequence == null || document == null)
return;
String content= document.get();
synchronized (this) {
if (fCharSequence == null)
return;
fCharSequence= content;
}
releaseDocument();
}
/**
* Removes the document listener.
*/
private synchronized void releaseDocument() {
if (fDocument != null)
fDocument.removeDocumentListener(fDocumentListener);
fDocument= null;
fDocumentListener= null;
}
}
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