if (attrName.equals("default-line-separator")) { // NOI18N

            return "\n"; // NOI18N

        }

         <change id="default-line-separator">

            <summary>Provides default line separator</summary>

            <version major="3" minor="19"/>

            <date day="13" month="1" year="2012"/>

            <author login="alexvsimon"/>

            <compatibility addition="yes" binary="compatible" source="compatible" semantic="compatible" deprecation="no" deletion="no" modification="no"/>

            <description>

                <p>

                    Defines name of default line separator property 

                    <code>DEFAULT_LINE_SEPARATOR_PROP</code>.

                    If property <code>getProperty(DEFAULT_LINE_SEPARATOR_PROP)</code> is defined, it will be used instead <code>System.getProperty("line.separator")</code>.

                    It will be used by the text editor if saving new content to an initially empty file.

                </p>

            </description>

            <class package="org.netbeans.editor" name="BaseDocument"/>

            <issue number="199534"/>

        </change>

    /** Default line separator property for writing content into files.

     * It will be used by the text editor if saving new content to an initially empty file.

     * If it not set the platform default line separator is used.

     * @since 3.19

     */

    public static final String DEFAULT_LINE_SEPARATOR_PROP = "default-line-separator"; // NOI18N

                        <code-name-base>org.netbeans.modules.editor.mimelookup</code-name-base>

                        <compile-dependency/>

                        <test/>

                    </test-dependency>

                    <test-dependency>

            String defaultLineSeparator = (String) file.getPrimaryFile().getAttribute(BaseDocument.DEFAULT_LINE_SEPARATOR_PROP);

            if (defaultLineSeparator != null) {

                doc.putProperty(BaseDocument.DEFAULT_LINE_SEPARATOR_PROP, defaultLineSeparator);

            }

/*

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.

 *

 * Copyright 2012 Oracle and/or its affiliates. All rights reserved.

 *

 * Oracle and Java are registered trademarks of Oracle and/or its affiliates.

 * Other names may be trademarks of their respective owners.

 *

 * The contents of this file are subject to the terms of either the GNU

 * General Public License Version 2 only ("GPL") or the Common

 * Development and Distribution License("CDDL") (collectively, the

 * "License"). You may not use this file except in compliance with the

 * License. You can obtain a copy of the License at

 * http://www.netbeans.org/cddl-gplv2.html

 * or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the

 * specific language governing permissions and limitations under the

 * License.  When distributing the software, include this License Header

 * Notice in each file and include the License file at

 * nbbuild/licenses/CDDL-GPL-2-CP.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the GPL Version 2 section of the License file that

 * accompanied this code. If applicable, add the following below the

 * License Header, with the fields enclosed by brackets [] replaced by

 * your own identifying information:

 * "Portions Copyrighted [year] [name of copyright owner]"

 *

 * If you wish your version of this file to be governed by only the CDDL

 * or only the GPL Version 2, indicate your decision by adding

 * "[Contributor] elects to include this software in this distribution

 * under the [CDDL or GPL Version 2] license." If you do not indicate a

 * single choice of license, a recipient has the option to distribute

 * your version of this file under either the CDDL, the GPL Version 2 or

 * to extend the choice of license to its licensees as provided above.

 * However, if you add GPL Version 2 code and therefore, elected the GPL

 * Version 2 license, then the option applies only if the new code is

 * made subject to such option by the copyright holder.

 *

 * Contributor(s):

 *

 * Portions Copyrighted 2012 Sun Microsystems, Inc.

 */

package org.netbeans.modules.editor;

import java.io.File;

import java.io.InputStream;

import javax.swing.SwingUtilities;

import javax.swing.text.BadLocationException;

import javax.swing.text.StyledDocument;

import org.netbeans.api.editor.mimelookup.MimePath;

import org.netbeans.api.editor.mimelookup.test.MockMimeLookup;

import org.netbeans.junit.MockServices;

import org.netbeans.junit.NbTestCase;

import org.openide.cookies.EditorCookie;

import org.openide.filesystems.*;

import org.openide.loaders.DataObject;

import org.openide.util.Exceptions;

import org.openide.util.NbPreferences;

/**

 *

 * @author Alexander Simon

 */

public class LineSeparatorDataEditorSupportTest extends NbTestCase {

    private MimePath textMimePath;

    static {

        System.setProperty("org.openide.windows.DummyWindowManager.VISIBLE", "false");

    }

    public LineSeparatorDataEditorSupportTest(String s) {

        super(s);

    }

    @Override

    protected void setUp() throws Exception {

        MockServices.setServices(new Class[]{MockMimeLookup.class});

        textMimePath = MimePath.parse("text/plain");

        MockMimeLookup.setInstances(textMimePath, new NbEditorKit(), NbPreferences.forModule(getClass()));

    }

    public void testLineSeparator() throws Exception {

        File file = File.createTempFile("lineSeparator", ".txt", getWorkDir());

        FileObject fileObject = FileUtil.toFileObject(file);

        fileObject.setAttribute("default-line-separator", "\r");

        DataObject dataObject = DataObject.find(fileObject);

        EditorCookie editor = dataObject.getLookup().lookup(org.openide.cookies.EditorCookie.class);

        final StyledDocument doc = editor.openDocument();

        SwingUtilities.invokeAndWait(new Runnable() {

            @Override

            public void run() {

                try {

                    doc.insertString(doc.getLength(), ".\n", null);

                } catch (BadLocationException ex) {

                    Exceptions.printStackTrace(ex);

                }

            }

        });

        editor.saveDocument();

        InputStream inputStream = fileObject.getInputStream();

        assertEquals('.',inputStream.read());

        assertEquals('\r',inputStream.read());

    }

}

         <change id="default-line-separator">

            <api name="filesystems"/>

            <summary>Provides default line separator</summary>

            <version major="7" minor="56"/>

            <date day="13" month="1" year="2012"/>

            <author login="alexvsimon"/>

            <compatibility addition="yes" binary="compatible" source="compatible" semantic="compatible" deprecation="no" deletion="no" modification="no"/>

            <description>

                <p>

                    File object can provide default line separator if it differs from <code>System.getProperty("line.separator")</code>.

                    Call <code>fo.getAttribute("default-line-separator")</code> return string with default line separator.

                    Default line separator will be used by the text editor if saving new content to an initially empty file.

                    Any other code which creates file content programmatically must manually read this property if it cares.

                </p>

            </description>

            <class package="org.openide.filesystems" name="FileObject"/>

            <issue number="199534"/>

        </change>

    /** Default line separator property for writing content into files.

     * It will be used by the text editor if saving new content to an initially empty file.

     * Any other code which creates file content programmatically must manually read this property if it cares.

     * If it not set the platform default line separator is used.

     */

    private static final String DEFAULT_LINE_SEPARATOR_PROP = "default-line-separator"; // NOI18N

        doc.putProperty(DEFAULT_LINE_SEPARATOR_PROP, fo.getAttribute(DEFAULT_LINE_SEPARATOR_PROP));