Index: java/j2seproject/src/org/netbeans/modules/java/j2seproject/api/J2SEProjectConfigurations.java
===================================================================
RCS file: java/j2seproject/src/org/netbeans/modules/java/j2seproject/api/J2SEProjectConfigurations.java
diff -N java/j2seproject/src/org/netbeans/modules/java/j2seproject/api/J2SEProjectConfigurations.java
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ java/j2seproject/src/org/netbeans/modules/java/j2seproject/api/J2SEProjectConfigurations.java	30 Jan 2007 14:44:59 -0000
@@ -0,0 +1,109 @@
+/*
+ * The contents of this file are subject to the terms of the Common Development
+ * and Distribution License (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.html
+ * or http://www.netbeans.org/cddl.txt.
+ *
+ * When distributing Covered Code, include this CDDL Header Notice in each file
+ * and include the License file at http://www.netbeans.org/cddl.txt.
+ * If applicable, add the following below the CDDL Header, with the fields
+ * enclosed by brackets [] replaced by your own identifying information:
+ * "Portions Copyrighted [year] [name of copyright owner]"
+ *
+ * The Original Software is NetBeans. The Initial Developer of the Original
+ * Software is Sun Microsystems, Inc. Portions Copyright 1997-2007 Sun
+ * Microsystems, Inc. All Rights Reserved.
+ */
+
+package org.netbeans.modules.java.j2seproject.api;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+
+import java.util.Properties;
+
+import org.netbeans.api.project.Project;
+import org.netbeans.api.project.ProjectManager;
+
+import org.openide.filesystems.FileObject;
+import org.openide.filesystems.FileSystem;
+import org.openide.filesystems.FileUtil;
+
+import org.openide.util.Mutex;
+import org.openide.util.MutexException;
+
+/**
+ * Utility class for creating project run configuration files
+ * 
+ * @author Milan Kubec
+ */
+public final class J2SEProjectConfigurations {
+    
+    J2SEProjectConfigurations() {}
+    
+    /**
+     * Creates property files for run configuration and writes passed properties.
+     * Shared properties are written to nbproject/configs folder and private properties
+     * are written to nbproject/private/configs folder. The property file is not created
+     * if null is passed for either shared or private properties.
+     * 
+     * @param prj project under which property files will be created
+     * @param configName name of the config file, '.properties' is apended
+     * @param sharedProps properties to be written to shared file
+     * @param privateProps properties to be written to private file
+     */
+    public static void createConfigurationFiles(Project prj, String configName, 
+            final Properties sharedProps, final Properties privateProps) throws IOException, IllegalArgumentException {
+        
+        if (prj == null || configName == null || "".equals(configName)) {
+            throw new IllegalArgumentException();
+        }
+        
+        final String configFileName = configName + ".properties"; // NOI18N
+        final FileObject prjDir = prj.getProjectDirectory();
+        
+        try {
+            ProjectManager.mutex().writeAccess(new Mutex.ExceptionAction<Void>() {
+                public Void run() throws IOException {
+                    prjDir.getFileSystem().runAtomicAction(new FileSystem.AtomicAction() {
+                        public void run() throws IOException {
+                            generateConfig(prjDir, "nbproject/configs/" + configFileName, sharedProps); // NOI18N
+                            generateConfig(prjDir, "nbproject/private/configs/" + configFileName, privateProps); // NOI18N
+                        }
+                    });
+                    return null;
+                }
+            });
+        } catch (MutexException ex) {
+            throw (IOException) ex.getException();
+        }
+        
+    }
+    
+    private static void generateConfig(FileObject prjDir, String cfgFilePath, Properties propsToWrite) throws IOException {
+        
+        if (propsToWrite == null) {
+            // do not create anything if props is null
+            return;
+        }
+        FileObject jwsConfigFO = FileUtil.createData(prjDir, cfgFilePath);
+        if (jwsConfigFO != null) {
+            Properties props = new Properties();
+            InputStream is = jwsConfigFO.getInputStream();
+            props.load(is);
+            is.close();
+            if (props.equals(propsToWrite)) {
+                // file already exists and props are the same
+                return;
+            }
+            OutputStream os = jwsConfigFO.getOutputStream();
+            propsToWrite.store(os, null);
+            os.close();
+        }
+        
+    }
+    
+}