Bug 73962 [IDE] NPE in CopyFilesAndFoldersOperation when overwriting existing folder
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/wizards/datatransfer/ImportOperation.java
* </p>
     *  <p>
     * The default import behavior is to recreate the complete container structure
     * for the contents of the root file system object in their destination. 
     * If <code>setCreateContainerStructure</code> is set to false then the container 
     * structure created is relative to the root file system object.
     * </p>
     * 
     * @param containerPath the full path of the destination container within the
     *   workspace
     * @param source the root file system object to import
     * @param provider the file system structure provider to use
     * @param overwriteImplementor the overwrite strategy to use
     */
    public ImportOperation(IPath containerPath, Object source,
            IImportStructureProvider provider,
            IOverwriteQuery overwriteImplementor) {
        super();
        this.destinationPath = containerPath;
        this.source = source;
        this.provider = provider;
        overwriteCallback = overwriteImplementor;
    }
    /**
     * Creates a new operation that imports specific file system objects.
     * In this usage context, the specified source file system object is used by the
     * operation solely to determine the destination container structure of the file system
     * objects being imported.
     * <p>
     * The <code>source</code> parameter represents the root file system object to