Synnefo

/*

 * Copyright 2007, 2008, 2009 Electronic Business Systems Ltd.

 *

 * This file is part of GSS.

 *

 * GSS is free software: you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation, either version 3 of the License, or

 * (at your option) any later version.

 *

 * GSS is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with GSS.  If not, see <http://www.gnu.org/licenses/>.

 */

package gr.ebs.gss.web.client;

import static com.google.gwt.query.client.GQuery.$;

import gr.ebs.gss.web.client.rest.GetCommand;

import gr.ebs.gss.web.client.rest.RestCommand;

import gr.ebs.gss.web.client.rest.RestException;

import gr.ebs.gss.web.client.rest.resource.FileResource;

import gr.ebs.gss.web.client.rest.resource.SearchResource;

import gr.ebs.gss.web.client.rest.resource.TrashResource;

import gr.ebs.gss.web.client.rest.resource.UserResource;

import gr.ebs.gss.web.client.rest.resource.UserSearchResource;

import gwtquery.plugins.draggable.client.DraggableOptions;

import gwtquery.plugins.draggable.client.StopDragException;

import gwtquery.plugins.draggable.client.DraggableOptions.DragFunction;

import gwtquery.plugins.draggable.client.DraggableOptions.RevertOption;

import gwtquery.plugins.draggable.client.events.DragContext;

import gwtquery.plugins.draggable.client.events.DragStartEvent;

import gwtquery.plugins.draggable.client.events.DragStopEvent;

import gwtquery.plugins.draggable.client.events.DragStartEvent.DragStartEventHandler;

import gwtquery.plugins.draggable.client.events.DragStopEvent.DragStopEventHandler;

import gwtquery.plugins.droppable.client.gwt.DragAndDropCellTable;

import gwtquery.plugins.droppable.client.gwt.DragAndDropColumn;

import java.util.ArrayList;

import java.util.Collections;

import java.util.Comparator;

import java.util.Iterator;

import java.util.List;

import com.google.gwt.cell.client.AbstractCell;

import com.google.gwt.cell.client.ImageResourceCell;

import com.google.gwt.cell.client.SafeHtmlCell;

import com.google.gwt.cell.client.TextCell;

import com.google.gwt.cell.client.ValueUpdater;

import com.google.gwt.core.client.GWT;

import com.google.gwt.core.client.Scheduler;

import com.google.gwt.core.client.Scheduler.RepeatingCommand;

import com.google.gwt.dom.client.Style.Cursor;

import com.google.gwt.http.client.URL;

import com.google.gwt.i18n.client.DateTimeFormat;

import com.google.gwt.resources.client.ClientBundle;

import com.google.gwt.resources.client.ImageResource;

import com.google.gwt.safehtml.client.SafeHtmlTemplates;

import com.google.gwt.safehtml.shared.SafeHtml;

import com.google.gwt.safehtml.shared.SafeHtmlBuilder;

import com.google.gwt.user.cellview.client.CellTable;

import com.google.gwt.user.cellview.client.GssSimplePager;

import com.google.gwt.user.cellview.client.HasKeyboardSelectionPolicy.KeyboardSelectionPolicy;

import com.google.gwt.user.client.DOM;

import com.google.gwt.user.client.DeferredCommand;

import com.google.gwt.user.client.Event;

import com.google.gwt.user.client.Window;

import com.google.gwt.user.client.ui.AbstractImagePrototype;

import com.google.gwt.user.client.ui.Composite;

import com.google.gwt.user.client.ui.HTML;

import com.google.gwt.user.client.ui.VerticalPanel;

import com.google.gwt.view.client.AsyncDataProvider;

import com.google.gwt.view.client.HasData;

import com.google.gwt.view.client.MultiSelectionModel;

import com.google.gwt.view.client.ProvidesKey;

import com.google.gwt.view.client.SelectionChangeEvent;

import com.google.gwt.view.client.SelectionChangeEvent.Handler;

import javax.xml.transform.Templates;

/**

 * A composite that displays a list of search results for a particular query on

 * files.

 */

public class SearchResults extends Composite{

        private HTML searchResults = new HTML("Results for search:");

        private String lastQuery;

        SearchDataProvider provider = new SearchDataProvider();

        /**

         * Specifies that the images available for this composite will be the ones

         * available in FileContextMenu.

         */

        public interface Images extends ClientBundle,FileContextMenu.Images, CellTreeView.Images, FileList.Images {

                @Source("gr/ebs/gss/resources/blank.gif")

                ImageResource blank();

                @Source("gr/ebs/gss/resources/asc.png")

                ImageResource asc();

                @Source("gr/ebs/gss/resources/desc.png")

                ImageResource desc();

        }

        interface TableResources extends DragAndDropCellTable.Resources {

            @Source({CellTable.Style.DEFAULT_CSS, "GssCellTable.css"})

            TableStyle cellTableStyle();

          }

        /**

           * The styles applied to the table.

           */

          interface TableStyle extends CellTable.Style {

          }

        private String showingStats = "";

        private int startIndex = 0;

        /**

         * A constant that denotes the completion of an IncrementalCommand.

         */

        public static final boolean DONE = false;

        private final DateTimeFormat formatter = DateTimeFormat.getFormat("d/M/yyyy h:mm a");

        DragStopEventHandler dragStop = new DragStopEventHandler() {

                @Override

                public void onDragStop(DragStopEvent event) {

                        GWT.log("DRAG STOPPED");

                }

        };

        private static class ContactCell extends AbstractCell<gr.ebs.gss.web.client.rest.resource.FileResource> {

            /**

             * The html of the image used for contacts.

             * 

             */

            private final String imageHtml;

            public ContactCell(ImageResource image) {

              this.imageHtml = AbstractImagePrototype.create(image).getHTML();

            }

            @Override

            public void render(Context context, FileResource value, SafeHtmlBuilder sb) {

              // Value can be null, so do a null check..

              if (value == null) {

                return;

              }

          sb.append(FileList.Templates.INSTANCE.rendelContactCell(imageHtml, value.getName(), value.getFileSizeAsString()));

            }

          }

        /**

         * Retrieve the celltable.

         *

         * @return the celltable

         */

        public DragAndDropCellTable<FileResource> getCelltable() {

                return celltable;

        }

        /**

         * The number of files in this folder.

         */

        int folderFileCount;

        /**

         * Total folder size

         */

        long folderTotalSize;

        /**

         * A cache of the files in the list.

         */

        private List<FileResource> files;

        /**

         * The widget's image bundle.

         */

        private final Images images;

        private FileContextMenu menuShowing;

        private DragAndDropCellTable<FileResource> celltable;

        private final MultiSelectionModel<FileResource> selectionModel;

        GssSimplePager pager;

        GssSimplePager pagerTop;

        /**

         * Construct the file list widget. This entails setting up the widget

         * layout, fetching the number of files in the current folder from the

         * server and filling the local file cache of displayed files with data from

         * the server, as well.

         *

         * @param _images

         */

        public SearchResults(Images _images) {

                images = _images;

                DragAndDropCellTable.Resources resources = GWT.create(TableResources.class);

                ProvidesKey<FileResource> keyProvider = new ProvidesKey<FileResource>(){

                        @Override

                        public Object getKey(FileResource item) {

                                return item.getUri();

                        }

                };

                celltable = new DragAndDropCellTable<FileResource>(GSS.VISIBLE_FILE_COUNT,resources,keyProvider){

                        @Override

                        protected void onBrowserEvent2(Event event) {

                                /*if (DOM.eventGetType((Event) event) == Event.ONMOUSEDOWN && DOM.eventGetButton((Event) event) == NativeEvent.BUTTON_RIGHT){

                                        fireClickEvent((Element) event.getEventTarget().cast());                                        

                                }*/

                                super.onBrowserEvent2(event);

                        }

                };

                provider.addDataDisplay(celltable);

                celltable.addDragStopHandler(dragStop);

                celltable.addDragStartHandler(new DragStartEventHandler() {

                      public void onDragStart(DragStartEvent event) {

                        FileResource value = event.getDraggableData();

                        com.google.gwt.dom.client.Element helper = event.getHelper();

                        SafeHtmlBuilder sb = new SafeHtmlBuilder();

                        sb.appendHtmlConstant("<b>");

                        DisplayHelper.log(value.getName());

                        if(getSelectedFiles().size()==1)

                                sb.appendEscaped(value.getName());

                        else

                                sb.appendEscaped(getSelectedFiles().size()+" files");

                        sb.appendHtmlConstant("</b>");

                        helper.setInnerHTML(sb.toSafeHtml().asString());

                      }

                    });

                DragAndDropColumn<FileResource, ImageResource> status = new DragAndDropColumn<FileResource, ImageResource>(new ImageResourceCell(){

                        @Override

                  public boolean handlesSelection() {

                            return false;

                          }

                }) {

                  @Override

                  public ImageResource getValue(FileResource entity) {

                    return getFileIcon(entity);

                  }

               };

            celltable.addColumn(status,"");

            initDragOperation(status);

                final DragAndDropColumn<FileResource,SafeHtml> nameColumn = new DragAndDropColumn<FileResource,SafeHtml>(new SafeHtmlCell()) {

                        @Override

                        public SafeHtml getValue(FileResource object) {

                                SafeHtmlBuilder sb = new SafeHtmlBuilder();

                sb.append(FileList.Templates.INSTANCE.filenameSpan(object.getName()));

                                if (object.getContentType().endsWith("png") || object.getContentType().endsWith("gif") || object.getContentType().endsWith("jpeg") ){

                    sb.appendHtmlConstant(" ").append(FileList.Templates.INSTANCE.viewLink(GSS.get().getTopPanel().getFileMenu().getDownloadURL(object), object.getOwner() + " : " + object.getPath() + object.getName()));

                                }

                                return sb.toSafeHtml();

                        }

                };

                initDragOperation(nameColumn);

                celltable.addColumn(nameColumn,"Name");

            DragAndDropColumn<FileResource,String> aColumn;

                celltable.addColumn(aColumn=new DragAndDropColumn<FileResource,String>(new TextCell()) {

                        @Override

                        public String getValue(FileResource object) {

                                return GSS.get().findUserFullName(object.getOwner());

                        }                        

                },"Owner");

                initDragOperation(aColumn);

                celltable.addColumn(aColumn=new DragAndDropColumn<FileResource,String>(new TextCell()) {

                        @Override

                        public String getValue(FileResource object) {

                                if(object.isDeleted())

                                        return object.getPath()+" (In Trash)";

                                return object.getPath();

                        }                        

                },"Path");

                initDragOperation(aColumn);

                celltable.addColumn(aColumn=new DragAndDropColumn<FileResource,String>(new TextCell()) {

                        @Override

                        public String getValue(FileResource object) {

                                return object.getVersion().toString();

                        }                        

                },"Version");

                initDragOperation(aColumn);

                celltable.addColumn(aColumn=new DragAndDropColumn<FileResource,String>(new TextCell()) {

                        @Override

                        public String getValue(FileResource object) {

                                // TODO Auto-generated method stub

                                return object.getFileSizeAsString();

                        }                        

                },"Size");

                initDragOperation(aColumn);

                celltable.addColumn(aColumn=new DragAndDropColumn<FileResource,String>(new TextCell()) {

                        @Override

                        public String getValue(FileResource object) {

                                return formatter.format(object.getModificationDate());

                        }                        

                },"Last Modified");

                VerticalPanel vp = new VerticalPanel();

                vp.setWidth("100%");

                celltable.setWidth("100%");

                vp.add(searchResults);

                searchResults.addStyleName("gss-searchLabel");

                pagerTop = new GssSimplePager(GssSimplePager.TextLocation.CENTER);

                pagerTop.setDisplay(celltable);

                vp.add(pagerTop);

                vp.add(celltable);

                pager = new GssSimplePager(GssSimplePager.TextLocation.CENTER);

                pager.setDisplay(celltable);

                //celltable.setPageSize(2);

                vp.add(pager);

                vp.setCellWidth(celltable, "100%");

                initWidget(vp);

                //initWidget(celltable);

                celltable.setStyleName("gss-List");

                selectionModel = new MultiSelectionModel<FileResource>();

                 Handler selectionHandler = new SelectionChangeEvent.Handler() { 

             @Override 

             public void onSelectionChange(com.google.gwt.view.client.SelectionChangeEvent event) {

                     if(getSelectedFiles().size()==1)

                             GSS.get().setCurrentSelection(getSelectedFiles().get(0));

                     else

                             GSS.get().setCurrentSelection(getSelectedFiles());

                                 //contextMenu.setFiles(getSelectedFiles());

             }

         };

         selectionModel.addSelectionChangeHandler(selectionHandler);

                celltable.setSelectionModel(selectionModel,GSSSelectionEventManager.<FileResource>createDefaultManager());

                celltable.setPageSize(GSS.VISIBLE_FILE_COUNT);

                celltable.setKeyboardSelectionPolicy(KeyboardSelectionPolicy.ENABLED);

                Scheduler.get().scheduleIncremental(new RepeatingCommand() {

                        @Override

                        public boolean execute() {

                                return fetchRootFolder();

                        }

                });

                sinkEvents(Event.ONCONTEXTMENU);

                sinkEvents(Event.ONMOUSEUP);

                sinkEvents(Event.ONMOUSEDOWN);

                sinkEvents(Event.ONCLICK);

                sinkEvents(Event.ONKEYDOWN);

                sinkEvents(Event.ONDBLCLICK);

                GSS.preventIESelection();

        }

        //public native void fireClickEvent(Element element) /*-{

          //  var evObj = $doc.createEvent('MouseEvents');

            //evObj.initEvent('click', true, true);

            //element.dispatchEvent(evObj);

          //}-*/;

         public List<FileResource> getSelectedFiles() {

         return new ArrayList<FileResource>(selectionModel.getSelectedSet());

         }

         private void initDragOperation(DragAndDropColumn<?, ?> column) {

                    // retrieve draggableOptions on the column

                    DraggableOptions draggableOptions = column.getDraggableOptions();

                    // use template to construct the helper. The content of the div will be set

                    // after

                    draggableOptions.setHelper($(FileList.Templates.INSTANCE.outerHelper().asString()));

                    //draggableOptions.setZIndex(100);

                    // opacity of the helper

                    draggableOptions.setAppendTo("body"); 

                    //draggableOptions.setOpacity((float) 0.8);

                    draggableOptions.setContainment("document");

                    // cursor to use during the drag operation

                    draggableOptions.setCursor(Cursor.MOVE);

                    // set the revert option

                    draggableOptions.setRevert(RevertOption.ON_INVALID_DROP);

                    // prevents dragging when user click on the category drop-down list

                    draggableOptions.setCancel("select");

                    draggableOptions.setOnBeforeDragStart(new DragFunction() {

                                @Override

                                public void f(DragContext context) {

                                         FileResource value = context.getDraggableData();

                                     if(!selectionModel.isSelected(value)){

                                               throw new StopDragException();

                                      }

                                }

                        });

                  }

         public void showContextMenu(Event event){

                 menuShowing = new FileContextMenu(images, false, true);

                        menuShowing=menuShowing.onEmptyEvent(event);

         }

        @Override

        public void onBrowserEvent(Event event) {

                if (files == null || files.size() == 0) {

                        if (DOM.eventGetType(event) == Event.ONCONTEXTMENU && getSelectedFiles().size() == 0) {

                                menuShowing = new FileContextMenu(images, false, true);

                                menuShowing=menuShowing.onEmptyEvent(event);

                                event.preventDefault();

                                event.cancelBubble(true);

                        }

                        return;

                }

                if (DOM.eventGetType(event) == Event.ONCONTEXTMENU && getSelectedFiles().size() != 0) {

                        GWT.log("*****GOING TO SHOW CONTEXT MENU ****", null);

                        menuShowing =  new FileContextMenu(images, false, false);

                        menuShowing=menuShowing.onEvent(event);

                        event.cancelBubble(true);

                        event.preventDefault();

                } else if (DOM.eventGetType(event) == Event.ONCONTEXTMENU && getSelectedFiles().size() == 0) {

                        menuShowing = new FileContextMenu(images, false, true);

                        menuShowing=menuShowing.onEmptyEvent(event);

                        event.cancelBubble(true);

                        event.preventDefault();

                } else if (DOM.eventGetType(event) == Event.ONDBLCLICK)

                        if (getSelectedFiles().size() == 1) {

                                GSS app = GSS.get();

                                FileResource file = getSelectedFiles().get(0);

                                String dateString = RestCommand.getDate();

                                String resource = file.getUri().substring(app.getApiPath().length() - 1, file.getUri().length());

                                String sig = app.getCurrentUserResource().getUsername() + " " +

                                                RestCommand.calculateSig("GET", dateString, resource,

                                                RestCommand.base64decode(app.getToken()));

                                if(!file.isDeleted()){

                                        Window.open(file.getUri() + "?Authorization=" + URL.encodeComponent(sig) + "&Date=" + URL.encodeComponent(dateString), "_blank", "");

                                }

                                event.preventDefault();

                                return;

                        }

                super.onBrowserEvent(event);

        }

        /**

         * Retrieve the root folder for the current user.

         *

         * @return true if the retrieval was successful

         */

        protected boolean fetchRootFolder() {

                UserResource user = GSS.get().getCurrentUserResource();

                if (user == null)

                        return !DONE;

                // Update cache and clear selection.

                updateFileCache(null);

                return DONE;

        }

        /**

         * Update the display of the file list.

         */

        void update(boolean sort) {

                int count = folderFileCount;

                int max = startIndex + GSS.VISIBLE_FILE_COUNT;

                if (max > count)

                        max = count;

                folderTotalSize = 0;

                copyListAndContinue(files);

                for(FileResource f : files){

                        folderTotalSize += f.getContentLength();

                }

                if (folderFileCount == 0) {

                        showingStats = "no files";

                } else if (folderFileCount < GSS.VISIBLE_FILE_COUNT) {

                        if (folderFileCount == 1)

                                showingStats = "1 file";

                        else

                                showingStats = folderFileCount + " files";

                        showingStats += " (" + FileResource.getFileSizeAsString(folderTotalSize) + ")";

                } else {

                        showingStats = "" + (startIndex + 1) + " - " + max + " of " + count + " files" + " (" + FileResource.getFileSizeAsString(folderTotalSize) + ")";

                }

                updateCurrentlyShowingStats();

        }

        /**

         * Return the proper icon based on the MIME type of the file.

         *

         * @param file

         * @return the icon

         */

        private ImageResource getFileIcon(FileResource file) {

                String mimetype = file.getContentType();

                boolean shared = file.isShared();

                if (mimetype == null)

                        return shared ? images.documentShared() : images.document();

                mimetype = mimetype.toLowerCase();

                if (mimetype.startsWith("application/pdf"))

                        return shared ? images.pdfShared() : images.pdf();

                else if (mimetype.endsWith("excel"))

                        return shared ? images.spreadsheetShared() : images.spreadsheet();

                else if (mimetype.endsWith("msword"))

                        return shared ? images.wordprocessorShared() : images.wordprocessor();

                else if (mimetype.endsWith("powerpoint"))

                        return shared ? images.presentationShared() : images.presentation();

                else if (mimetype.startsWith("application/zip") ||

                                        mimetype.startsWith("application/gzip") ||

                                        mimetype.startsWith("application/x-gzip") ||

                                        mimetype.startsWith("application/x-tar") ||

                                        mimetype.startsWith("application/x-gtar"))

                        return shared ? images.zipShared() : images.zip();

                else if (mimetype.startsWith("text/html"))

                        return shared ? images.htmlShared() : images.html();

                else if (mimetype.startsWith("text/plain"))

                        return shared ? images.txtShared() : images.txt();

                else if (mimetype.startsWith("image/"))

                        return shared ? images.imageShared() : images.image();

                else if (mimetype.startsWith("video/"))

                        return shared ? images.videoShared() : images.video();

                else if (mimetype.startsWith("audio/"))

                        return shared ? images.audioShared() : images.audio();

                return shared ? images.documentShared() : images.document();

        }

        /**

         * Update status panel with currently showing file stats.

         */

        public void updateCurrentlyShowingStats() {

                GSS.get().getStatusPanel().updateCurrentlyShowing(showingStats);

        }

        public void updateFileCache(String query) {

                final GSS app = GSS.get();

                setLastQuery(query);

                clearSelectedRows();

                //clearLabels();

                startIndex = 0;

                app.showLoadingIndicator();

                if (query == null || query.trim().equals("")) {

                        searchResults.setHTML("You must specify a query.");

                        setFiles(new ArrayList());

                        update(true);

                        app.hideLoadingIndicator();

                } else if (!GSS.isValidResourceName(query)) {

                        searchResults.setHTML("The query was invalid. Try to use words that appear in the file's name, contents or tags.");

                        setFiles(new ArrayList());

                        update(true);

                        app.hideLoadingIndicator();

                } else{

                        searchResults.setHTML("Search results for " + query);

                        showCellTable(true);

                }

        }

        /**

         * Fill the file cache with data.

         */

        public void setFiles(final List<FileResource> _files) {

                if (_files.size() > 0 && ! (GSS.get().getTreeView().getSelection() instanceof TrashResource)) {

                        files = new ArrayList<FileResource>();

                        for (FileResource fres : _files)

                                files.add(fres);

                }

                else

                        files = _files;

                Collections.sort(files, new Comparator<FileResource>() {

                        @Override

                        public int compare(FileResource arg0, FileResource arg1) {

                                return arg0.getName().compareTo(arg1.getName());

                        }

                });

                folderFileCount = files.size();

        }

        /**

         * Does the list contains the requested filename

         *

         * @param fileName

         * @return true/false

         */

        public boolean contains(String fileName) {

                for (int i = 0; i < files.size(); i++)

                        if (files.get(i).getName().equals(fileName))

                                return true;

                return false;

        }

        public void clearSelectedRows() {

                Iterator<FileResource> it = selectionModel.getSelectedSet().iterator();

                while(it.hasNext()){

                        selectionModel.setSelected(it.next(),false);

                }

        }

        /**

         *

         */

        public void selectAllRows() {

                Iterator<FileResource> it = selectionModel.getSelectedSet().iterator();

                while(it.hasNext()){

                        selectionModel.setSelected(it.next(),true);

                }

        }

        private void sortFiles(final String sortingProperty, final boolean sortingType){

                Collections.sort(files, new Comparator<FileResource>() {

            @Override

            public int compare(FileResource arg0, FileResource arg1) {

                    AbstractImagePrototype descPrototype = AbstractImagePrototype.create(images.desc());

                    AbstractImagePrototype ascPrototype = AbstractImagePrototype.create(images.asc());

                    if (sortingType){

                            if (sortingProperty.equals("version")) {

                                    return arg0.getVersion().compareTo(arg1.getVersion());

                            } else if (sortingProperty.equals("owner")) {

                                    return arg0.getOwner().compareTo(arg1.getOwner());

                            } else if (sortingProperty.equals("date")) {

                                    return arg0.getModificationDate().compareTo(arg1.getModificationDate());

                            } else if (sortingProperty.equals("size")) {

                                    return arg0.getContentLength().compareTo(arg1.getContentLength());

                            } else if (sortingProperty.equals("name")) {

                                    return arg0.getName().compareTo(arg1.getName());

                            } else if (sortingProperty.equals("path")) {

                                    return arg0.getUri().compareTo(arg1.getUri());

                            } else {

                                    return arg0.getName().compareTo(arg1.getName());

                            }

                    }

                    else if (sortingProperty.equals("version")) {

                            return arg1.getVersion().compareTo(arg0.getVersion());

                    } else if (sortingProperty.equals("owner")) {

                            return arg1.getOwner().compareTo(arg0.getOwner());

                    } else if (sortingProperty.equals("date")) {

                            return arg1.getModificationDate().compareTo(arg0.getModificationDate());

                    } else if (sortingProperty.equals("size")) {

                            return arg1.getContentLength().compareTo(arg0.getContentLength());

                    } else if (sortingProperty.equals("name")) {

                            return arg1.getName().compareTo(arg0.getName());

                    } else if (sortingProperty.equals("path")) {

                            return arg1.getUri().compareTo(arg0.getUri());

                    } else {

                            return arg1.getName().compareTo(arg0.getName());

                    }

            }

                });

        }

        /**

         * Creates a new ArrayList<FileResources> from the given files ArrayList 

         * in order that the input files remain untouched 

         * and continues to find user's full names of each FileResource element

         * in the new ArrayList

         *    

         * @param filesInput

         */

        private void copyListAndContinue(List<FileResource> filesInput){

                List<FileResource> copiedFiles = new ArrayList<FileResource>();                

                for(FileResource file : filesInput) {

                        copiedFiles.add(file);

                }

                handleFullNames(copiedFiles);

        }

        /**

         * Examines whether or not the user's full name exists in the 

         * userFullNameMap in the GSS.java for every element of the input list.

         * If the user's full name does not exist in the map then a command is being made.  

         * 

         * @param filesInput

         */

        private void handleFullNames(List<FileResource> filesInput){                

                if(filesInput.size() == 0){

                        showCellTable(false);

                        return;

                }                

                if(GSS.get().findUserFullName(filesInput.get(0).getOwner()) == null){

                        findFullNameAndUpdate(filesInput);                

                        return;

                }

                if(filesInput.size() >= 1){

                        filesInput.remove(filesInput.get(0));

                        if(filesInput.isEmpty()){

                                showCellTable(false);                                

                        }else{

                                handleFullNames(filesInput);

                        }

                }                

        }

        /**

         * Makes a command to search for full name from a given username. 

         * Only after the completion of the command the celltable is shown

         * or the search for the next full name continues.

         *  

         * @param filesInput

         */

        private void findFullNameAndUpdate(final List<FileResource> filesInput){                

                String aUserName = filesInput.get(0).getOwner();

                String path = GSS.get().getApiPath() + "users/" + aUserName; 

                GetCommand<UserSearchResource> gg = new GetCommand<UserSearchResource>(UserSearchResource.class, path, false,null) {

                        @Override

                        public void onComplete() {

                                final UserSearchResource result = getResult();

                                for (UserResource user : result.getUsers()){

                                        String username = user.getUsername();

                                        String userFullName = user.getName();

                                        GSS.get().putUserToMap(username, userFullName);

                                        if(filesInput.size() >= 1){

                                                filesInput.remove(filesInput.get(0));

                                                if(filesInput.isEmpty()){

                                                        showCellTable(false);

                                                }else{

                                                        handleFullNames(filesInput);

                                                }                                                                                                

                                        }                                                                        

                                }

                        }

                        @Override

                        public void onError(Throwable t) {

                                GWT.log("", t);

                                GSS.get().displayError("Unable to fetch user's full name from the given username " + filesInput.get(0).getOwner());

                                if(filesInput.size() >= 1){

                                        filesInput.remove(filesInput.get(0));

                                        handleFullNames(filesInput);                                        

                                }

                        }

                };

                DeferredCommand.addCommand(gg);

        }

        /**

         * Shows the files in the cellTable 

         */

        private void showCellTable(boolean update){

                if(celltable.getRowCount()>GSS.VISIBLE_FILE_COUNT){

                        pager.setVisible(true);

                        pagerTop.setVisible(true);

                }

                else{

                        pager.setVisible(false);

                        pagerTop.setVisible(false);

                }

                if(update)

                        provider.onRangeChanged(celltable);

                celltable.redrawHeaders();                

        }

        /**

         * Retrieve the lastQuery.

         *

         * @return the lastQuery

         */

        public String getLastQuery() {

                return lastQuery;

        }

        /**

         * Modify the lastQuery.

         *

         * @param lastQuery the lastQuery to set

         */

        public void setLastQuery(String lastQuery) {

                this.lastQuery = lastQuery;

        }

        class SearchDataProvider extends AsyncDataProvider<FileResource>{

                @Override

                protected void onRangeChanged(final HasData<FileResource> display) {

                        final int start = display.getVisibleRange().getStart();

                        final GSS app = GSS.get();

                        if(getLastQuery()==null||getLastQuery().equals("")){

                                display.setRowCount(0,true);

                                return;

                        }

                        GetCommand<SearchResource> eg = new GetCommand<SearchResource>(SearchResource.class,

                                                app.getApiPath() + "search/" +URL.encodeComponent(getLastQuery())+"?start="+start, null) {

                                @Override

                                public void onComplete() {

                                        SearchResource s = getResult();

                                        display.setRowCount(s.getSize(),true);

                                        display.setRowData(start, s.getFiles());

                                        setFiles(s.getFiles());

                                        update(true);

                                }

                                @Override

                                public void onError(Throwable t) {

                                        if(t instanceof RestException)

                                                app.displayError("Unable to perform search:"+((RestException)t).getHttpStatusText());

                                        else

                                                app.displayError("System error performing search:"+t.getMessage());

                                        GWT.log("",t);

                                        updateFileCache("");

                                }

                        };

                        DeferredCommand.addCommand(eg);

                }

        }

}