Synnefo » Pithos

/*

 * 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.client;

import gr.ebs.gss.client.dnd.DnDTreeItem;

import gr.ebs.gss.client.rest.resource.FolderResource;

import gr.ebs.gss.client.rest.resource.OtherUserResource;

import gr.ebs.gss.client.rest.resource.RestResource;

import gr.ebs.gss.client.tree.FolderSubtree;

import gr.ebs.gss.client.tree.MyShareSubtree;

import gr.ebs.gss.client.tree.OthersSharesSubtree;

import gr.ebs.gss.client.tree.TrashSubtree;

import java.util.ArrayList;

import java.util.List;

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

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

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

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

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

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

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

/**

 * A tree displaying the folders in the user's file space.

 */

public class Folders extends Composite {

        /**

         * A constant that denotes the completion of an IncrementalCommand.

         */

        public static final boolean DONE = false;

        /**

         * Specifies the images that will be bundled for this Composite and other

         * inherited images that will be included in the same bundle.

         */

        public interface Images extends ClientBundle,Tree.Resources, FolderContextMenu.Images {

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

                ImageResource home();

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

                ImageResource folderYellow();

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

                ImageResource document();

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

                ImageResource othersShared();

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

                ImageResource myShared();

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

                ImageResource sharedFolder();

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

                ImageResource trash();

        }

        /**

         * The widget's image bundle.

         */

        private final Images images;

        /**

         * The tree widget that displays the folder namespace.

         */

        private PopupTree tree;

        /**

         * A cached copy of the currently selected folder widget.

         */

        private FolderSubtree folderSubtree;

        private TrashSubtree trashSubtree;

        private MyShareSubtree myShareSubtree;

        private OthersSharesSubtree othersSharesSubtree;

        /**

         * Constructs a new folders widget with a bundle of images.

         *

         * @param _images a bundle that provides the images for this widget

         */

        public Folders(final Images _images) {

                images = _images;

                tree = new PopupTree(images);

                tree.setAnimationEnabled(true);

                initWidget(tree);

                folderSubtree = new FolderSubtree(tree, images);

                myShareSubtree = new MyShareSubtree(tree, images);

                trashSubtree = new TrashSubtree(tree, images);

                othersSharesSubtree = new OthersSharesSubtree(tree, images);

        }

        public Images getImages() {

                return images;

        }

        public void select(TreeItem item) {

                tree.processItemSelected(item);

        }

        public void clearSelection() {

                tree.clearSelection();

        }

        public void update(TreeItem item) {

                if (isFileItem(item))

                        folderSubtree.updateSubfolders((DnDTreeItem) item);

                else if (isTrash(item))

                        trashSubtree.update();

                else if (isMySharedItem(item))

                        myShareSubtree.update((DnDTreeItem) item);

                else if (isOthersSharedItem(item))

                        othersSharesSubtree.update((DnDTreeItem) item);

        }

        public void updateFolder(final DnDTreeItem folderItem) {

                if (isFileItem(folderItem)){

                        folderSubtree.updateFolderAndSubfolders(folderItem);

                        myShareSubtree.updateFolderAndSubfolders((DnDTreeItem) getMySharesItem());

                }

                else if (isMySharedItem(folderItem)){

                        myShareSubtree.updateFolderAndSubfolders(folderItem);

                        if (folderItem.getFolderResource() != null) {

                                DnDTreeItem fitem = (DnDTreeItem) getUserItem(getRootItem(), folderItem.getFolderResource().getUri());

                                if (fitem != null)

                                        folderSubtree.updateFolderAndSubfolders(fitem);

                                else

                                        folderSubtree.updateFolderAndSubfolders((DnDTreeItem) getRootItem());

                        }

                }

                else if (isTrashItem(folderItem))

                        trashSubtree.update();

                else if (isOthersSharedItem(folderItem))

                        othersSharesSubtree.updateFolderAndSubfolders(folderItem);

        }

        /**

         * Retrieve the current.

         *

         * @return the current

         */

        public TreeItem getCurrent() {

                return tree.getTreeSelectedItem();

        }

        /**

         * Modify the current.

         *

         * @param _current the current to set

         */

        void setCurrent(final TreeItem _current) {

                tree.setTreeSelectedItem(_current);

        }

        /**

         * Checks whether a TreeItem is contained in the root folder structure

         *

         * @param item The TreeItem to check

         */

        public boolean isFileItem(TreeItem item) {

                if (getRootOfItem(item).equals(getRootItem()))

                        return true;

                return false;

        }

        /**

         * Checks whether a TreeItem is contained in the trash folder structure

         *

         * @param item The TreeItem to check

         */

        public boolean isTrashItem(TreeItem item) {

                if (getRootOfItem(item).equals(getTrashItem()))

                        return true;

                return false;

        }

        /**

         * Checks whether a TreeItem is contained in the trash folder structure

         *

         * @param item The TreeItem to check

         */

        public boolean isOthersSharedItem(TreeItem item) {

                if (getRootOfItem(item).equals(getSharesItem()))

                        return true;

                return false;

        }

        /**

         * Checks whether a TreeItem is contained in the trash folder structure

         *

         * @param item The TreeItem to check

         */

        public boolean isMySharedItem(TreeItem item) {

                if (getRootOfItem(item).equals(getMySharesItem()))

                        return true;

                return false;

        }

        private TreeItem getRootOfItem(TreeItem item) {

                if (item.getParentItem() == null)

                        return item;

                TreeItem toCheck = item;

                while (toCheck.getParentItem() != null) {

                        toCheck = toCheck.getParentItem();

                        toCheck = getRootOfItem(toCheck);

                }

                return toCheck;

        }

        public TreeItem getUserOfSharedItem(TreeItem item) {

                if (item.getUserObject() instanceof OtherUserResource)

                        return item;

                TreeItem test = item;

                while (test.getParentItem() != null) {

                        test = test.getParentItem();

                        if (test.getUserObject() instanceof OtherUserResource)

                                return test;

                }

                return null;

        }

        public boolean isTrash(TreeItem item) {

                return item.equals(getTrashItem());

        }

        public boolean isMyShares(TreeItem item) {

                return item.equals(getMySharesItem());

        }

        public boolean isOthersShared(TreeItem item) {

                return item.equals(getSharesItem());

        }

        /*

         * Returns the Tree Item corresponding to the FolderDTO object

         * since we need to update main file structure for untrashed folders

         */

        public TreeItem getUserItem(FolderResource folder) {

                return getUserItem(getRootItem(), folder);

        }

        public TreeItem getOtherSharedItem(FolderResource folder) {

                return getUserItem(getSharesItem(), folder);

        }

        private TreeItem getUserItem(TreeItem parent, FolderResource folder) {

                TreeItem tmp = null;

                if (parent.getUserObject() instanceof FolderResource &&

                                        (parent.getUserObject().equals(folder) ||

                                        ((FolderResource) parent.getUserObject()).getUri().equals(folder.getUri())))

                        return parent;

                for (int i = 0; i < parent.getChildCount(); i++) {

                        TreeItem child = parent.getChild(i);

                        if (child.getUserObject() instanceof FolderResource) {

                                FolderResource dto = (FolderResource) child.getUserObject();

                                if (dto.equals(folder) || dto.getUri().equals(folder.getUri()))

                                        return child;

                        }

                        tmp = getUserItem(child, folder);

                        if (tmp != null)

                                return tmp;

                }

                return null;

        }

        /**

         * Retrieve the trashItem.

         *

         * @return the trashItem

         */

        public TreeItem getTrashItem() {

                return trashSubtree.getRootItem();

        }

        /**

         * Retrieve the rootItem.

         *

         * @return the rootItem

         */

        public TreeItem getRootItem() {

                return folderSubtree.getRootItem();

        }

        /**

         * Retrieve the mySharesItem.

         *

         * @return the mySharesItem

         */

        public TreeItem getMySharesItem() {

                return myShareSubtree.getRootItem();

        }

        /**

         * Retrieve the sharesItem.

         *

         * @return the sharesItem

         */

        public TreeItem getSharesItem() {

                return othersSharesSubtree.getRootItem();

        }

        public void onFolderTrash(TreeItem folder) {

                if (folder.getParentItem().getUserObject() instanceof FolderResource) {

                        FolderResource folderDTO = (FolderResource) folder.getParentItem().getUserObject();

                        updateFileAndShareNodes(folderDTO);

                } else

                        update(getMySharesItem());

                update(getTrashItem());

                clearSelection();

                GSS.get().getFileList().updateFileCache(false, true /*clear selection*/);

        }

        public void onFolderDelete(TreeItem folder) {

                if (folder.getParentItem().getUserObject() instanceof FolderResource) {

                        FolderResource folderDTO = (FolderResource) folder.getParentItem().getUserObject();

                        updateFileAndShareNodes(folderDTO);

                } else

                        update(getMySharesItem());

                GSS.get().getStatusPanel().updateStats();

                clearSelection();

                GSS.get().getFileList().updateFileCache(false, true /*clear selection*/);

        }

        public void onFolderCopy(TreeItem folder) {

                if (!updateFileAndShareNodes((FolderResource) folder.getUserObject()))

                        update(folder);

                GSS.get().getFileList().updateFileCache(false, true /*clear selection*/);

                GSS.get().getStatusPanel().updateStats();

        }

        public void onFolderMove(TreeItem folder, FolderResource initialParent) {

                updateFileAndShareNodes(initialParent);

                updateFileAndShareNodes((FolderResource) folder.getUserObject());

                update(folder);

                GSS.get().getFileList().updateFileCache(false, true /*clear selection*/);

                GSS.get().getStatusPanel().updateStats();

                clearSelection();

        }

        private boolean updateFileAndShareNodes(FolderResource folder) {

                boolean updated = false;

                TreeItem sharesFolder = getUserItem(getMySharesItem(), folder);

                if (sharesFolder != null) {

                        update(sharesFolder);

                        updated = true;

                }

                TreeItem fileFolder = getUserItem(getRootItem(), folder);

                if (fileFolder != null) {

                        update(fileFolder);

                        updated = true;

                }

                return updated;

        }

        public void initialize() {

                DeferredCommand.addCommand(new Command() {

                        @Override

                        public void execute() {

                                GSS.get().showLoadingIndicator();

                                folderSubtree.getRootItem().removeItems();

                                trashSubtree.getRootItem().removeItems();

                                myShareSubtree.getRootItem().removeItems();

                                othersSharesSubtree.getRootItem().removeItems();

                                update(folderSubtree.getRootItem());

                                update(trashSubtree.getRootItem());

                                update(myShareSubtree.getRootItem());

                                update(othersSharesSubtree.getRootItem());

                                GSS.get().setCurrentSelection(null);

                                clearSelection();

                                GSS.get().getFileList().updateFileCache(false, true /*clear selection*/);

                                GSS.get().hideLoadingIndicator();

                        }

                });

        }

        /* NEW HANDLING METHODS */

        public TreeItem getUserItem(TreeItem parent, String path) {

                TreeItem tmp = null;

                if (parent.getUserObject() instanceof RestResource && ((RestResource) parent.getUserObject()).getUri().equals(path))

                        return parent;

                for (int i = 0; i < parent.getChildCount(); i++) {

                        TreeItem child = parent.getChild(i);

                        if (child.getUserObject() instanceof RestResource) {

                                RestResource dto = (RestResource) child.getUserObject();

                                if (dto.getUri().equals(path))

                                        return child;

                        }

                        tmp = getUserItem(child, path);

                        if (tmp != null)

                                return tmp;

                }

                return null;

        }

        public List<TreeItem> getItemsOfTreeForPath(String path) {

                List<TreeItem> result = new ArrayList<TreeItem>();

                TreeItem item = null;

                item = getUserItem(getRootItem(), path);

                if (item != null)

                        result.add(item);

                item = getUserItem(getMySharesItem(), path);

                if (item != null)

                        result.add(item);

                item = getUserItem(getTrashItem(), path);

                if (item != null)

                        result.add(item);

                item = getUserItem(getSharesItem(), path);

                if (item != null)

                        result.add(item);

                return result;

        }

        /**

         * This method returns the current Popup Tree

         * @return the popuptree

         */

        public PopupTree getPopupTree(){

                return tree;

        }

}