/**
* Copyright (c) 2015 Polago AB
* All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/

package org.polago.deployconf.group;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.StandardOpenOption;
import java.util.Properties;

/**
 * ConfigGroup that uses the file system for storing.
 */
public class FileSystemConfigGroup implements ConfigGroup {

    private final Path path;

    private final Properties properties;

    /**
     * Public Constructor.
     *
     * @param name the config group name
     * @param dir the repository where to store config groups
     * @throws IOException indicating IO error
     */
    public FileSystemConfigGroup(String name, Path dir) throws IOException {
        path = dir.resolve(name + "-config-group.xml");
        properties = new Properties();

        if (Files.exists(path)) {
            InputStream is = Files.newInputStream(path);
            try {
                properties.loadFromXML(is);
            } finally {
                is.close();
            }
        }
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public String getProperty(String name) {
        return properties.getProperty(name);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void setProperty(String name, String value) throws IOException {
        properties.setProperty(name, value);
        OutputStream os = Files.newOutputStream(path, StandardOpenOption.CREATE);
        try {
            properties.storeToXML(os, null);
        } finally {
            os.close();
        }

    }

}

@@ -2434,32 +2434,119 @@
 s IOException %7B%0A
+        if (value == null) %7B%0A            properties.remove(name);%0A        %7D else %7B%0A    
         properti
@@ -2582,16 +2582,20 @@
         
+   
+ 
 OutputSt
@@ -2660,32 +2660,36 @@
 REATE);%0A        
+    
 try %7B%0A          
@@ -2682,32 +2682,36 @@
 y %7B%0A            
+   
+ 
 properties.store
@@ -2727,32 +2727,36 @@
  null);%0A        
+    
 %7D finally %7B%0A    
@@ -2763,16 +2763,20 @@
         
+  
+  
 os.close
@@ -2783,24 +2783,37 @@
 ();%0A        
+    %7D%0A        
 %7D
-%0A
 %0A    %7D%0A%0A%7D%0A

Handle null value as remove