Copyright (c) 2000, 2008 IBM Corporation and others.
This program and the accompanying materials
are made available under the terms of the Eclipse Public License 2.0
which accompanies this distribution, and is available at
https://www.eclipse.org/legal/epl-2.0/
SPDX-License-Identifier: EPL-2.0
Contributors:
    IBM Corporation - initial API and implementation
/*******************************************************************************
 * Copyright (c) 2000, 2008 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.core.filebuffers.manipulation;

import org.eclipse.core.internal.filebuffers.FileBuffersPlugin;

import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.core.runtime.SubMonitor;

import org.eclipse.core.filebuffers.IFileBufferStatusCodes;
import org.eclipse.core.filebuffers.ITextFileBuffer;

import org.eclipse.text.edits.ReplaceEdit;

import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.DocumentRewriteSessionType;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.IRegion;

A text file buffer operation that changes the line delimiters to a specified
line delimiter.
Since:
3.1/**
 * A text file buffer operation that changes the line delimiters to a specified
 * line delimiter.
 *
 * @since 3.1
 */
public class ConvertLineDelimitersOperation extends TextFileBufferOperation {

	private String fLineDelimiter;

	
Creates a new line delimiter conversion operation for the given target
delimiter.
Params:
lineDelimiter – the target line delimiter/**
	 * Creates a new line delimiter conversion operation for the given target
	 * delimiter.
	 *
	 * @param lineDelimiter the target line delimiter
	 */
	public ConvertLineDelimitersOperation(String lineDelimiter) {
		super(FileBuffersMessages.ConvertLineDelimitersOperation_name);
		fLineDelimiter= lineDelimiter;
	}

	@Override
	protected MultiTextEditWithProgress computeTextEdit(ITextFileBuffer fileBuffer, IProgressMonitor progressMonitor) throws CoreException {
		IDocument document= fileBuffer.getDocument();
		int lineCount= document.getNumberOfLines();

		SubMonitor subMonitor= SubMonitor.convert(progressMonitor, FileBuffersMessages.ConvertLineDelimitersOperation_task_generatingChanges, lineCount);
		try {

			MultiTextEditWithProgress multiEdit= new MultiTextEditWithProgress(FileBuffersMessages.ConvertLineDelimitersOperation_task_applyingChanges);

			for (int i= 0; i < lineCount; i++) {
				final String delimiter= document.getLineDelimiter(i);
				if (delimiter != null && !delimiter.isEmpty() && !delimiter.equals(fLineDelimiter)) {
					IRegion region= document.getLineInformation(i);
					multiEdit.addChild(new ReplaceEdit(region.getOffset() + region.getLength(), delimiter.length(), fLineDelimiter));
				}
				subMonitor.split(1);
			}

			return multiEdit.getChildrenSize() <= 0 ? null : multiEdit;

		} catch (BadLocationException x) {
			throw new CoreException(new Status(IStatus.ERROR, FileBuffersPlugin.PLUGIN_ID, IFileBufferStatusCodes.CONTENT_CHANGE_FAILED, "", x)); //$NON-NLS-1$
		}
	}

	@Override
	protected DocumentRewriteSessionType getDocumentRewriteSessionType() {
		return DocumentRewriteSessionType.SEQUENTIAL;
	}
}