Synnefo » Pithos Web Client

/*

 * Copyright 2011-2012 GRNET S.A. All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or

 * without modification, are permitted provided that the following

 * conditions are met:

 *

 *   1. Redistributions of source code must retain the above

 *      copyright notice, this list of conditions and the following

 *      disclaimer.

 *

 *   2. Redistributions in binary form must reproduce the above

 *      copyright notice, this list of conditions and the following

 *      disclaimer in the documentation and/or other materials

 *      provided with the distribution.

 *

 * THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS

 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR

 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF

 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED

 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

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 * The views and conclusions contained in the software and

 * documentation are those of the authors and should not be

 * interpreted as representing official policies, either expressed

 * or implied, of GRNET S.A.

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package gr.grnet.pithos.web.client.foldertree;

import gr.grnet.pithos.web.client.FolderContextMenu;

import gr.grnet.pithos.web.client.Pithos;

import gr.grnet.pithos.web.client.foldertree.FolderTreeView.Templates;

import gr.grnet.pithos.web.client.rest.GetRequest;

import gr.grnet.pithos.web.client.rest.RestException;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.Iterator;

import java.util.Map;

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

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

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

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

import com.google.gwt.event.dom.client.ContextMenuEvent;

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

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

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

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

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

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

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

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

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

public class FolderTreeViewModel implements TreeViewModel {

        protected Pithos app;

    private Cell<Folder> folderCell = new AbstractCell<Folder>(ContextMenuEvent.getType().getName()) {

       @Override

        public void render(Context context, Folder folder, SafeHtmlBuilder safeHtmlBuilder) {

            String html;

            SafeHtml name;

                if (folder.isHome()) {

                        html = AbstractImagePrototype.create(FolderTreeView.images.folderYellow()).getHTML();

                        name = Templates.INSTANCE.nameSpan("Pithos");

                }

                else if (folder.isTrash()) {

                        html = AbstractImagePrototype.create(FolderTreeView.images.trash()).getHTML();

                        name = Templates.INSTANCE.nameSpan("Trash");

                }

            else {

                    html = AbstractImagePrototype.create(folder.isShared() ? FolderTreeView.images.myShared() : FolderTreeView.images.folderYellow()).getHTML();

                        name = Templates.INSTANCE.nameSpan(folder.getName());

            }

            safeHtmlBuilder.appendHtmlConstant(html).appendHtmlConstant(" ");

            safeHtmlBuilder.append(name);

        }

        @Override

        public void onBrowserEvent(Cell.Context context, com.google.gwt.dom.client.Element parent, final Folder folder, com.google.gwt.dom.client.NativeEvent event, com.google.gwt.cell.client.ValueUpdater<Folder> valueUpdater) {

            if (event.getType().equals(ContextMenuEvent.getType().getName())) {

                    final int x = event.getClientX();

                    final int y = event.getClientY();

                FolderTreeViewModel.this.selectionModel.setSelected(folder, true);

                app.scheduleFolderHeadCommand(folder, new Command() {

                                        @Override

                                        public void execute() {

                                FolderContextMenu menu = new FolderContextMenu(app, FolderTreeView.images, app.getSelectedTree(), folder);

                                menu.setPopupPosition(x, y);

                                menu.show();

                                        }

                                });

            }

        }

    };

    protected ListDataProvider<Folder> rootDataProvider = new ListDataProvider<Folder>();

    private Map<Folder, ListDataProvider<Folder>> dataProviderMap = new HashMap<Folder, ListDataProvider<Folder>>();

    protected SingleSelectionModel<Folder> selectionModel;

    public FolderTreeViewModel(Pithos _app, SingleSelectionModel<Folder> selectionModel) {

        app = _app;

        this.selectionModel = selectionModel;

    }

    @Override

    public <T> NodeInfo<?> getNodeInfo(T value) {

        if (value == null) {

            Folder f = new Folder("Loading ...");

            rootDataProvider.getList().add(f);

            return new DefaultNodeInfo<Folder>(rootDataProvider, folderCell, selectionModel, null);

        }

                final Folder f = (Folder) value;

                if (dataProviderMap.get(f) == null) {

                    dataProviderMap.put(f, new ListDataProvider<Folder>());

                }

                final ListDataProvider<Folder> dataProvider = dataProviderMap.get(f);

                //This prevents the loading indicator

                fetchFolder(f, dataProvider, false, null);

                return new DefaultNodeInfo<Folder>(dataProvider, folderCell, selectionModel, null);

    }

    @Override

    public boolean isLeaf(Object o) {

        if (o instanceof Folder) {

            Folder f = (Folder) o;

            return f.getSubfolders().isEmpty();

        }

        return false;

    }

        private native void log(String msg) /*-{

        $wnd.console.log(msg);

        }-*/;

    protected void fetchFolder(final Iterator<Folder> iter, final Command callback) {

        if (iter.hasNext()) {

            final Folder f = iter.next();

            String path = "/" + f.getContainer() + "?format=json&delimiter=/&prefix=" + URL.encodeQueryString(f.getPrefix());

            GetRequest<Folder> getFolder = new GetRequest<Folder>(Folder.class, app.getApiPath(), f.getOwner(), path, f) {

                @Override

                public void onSuccess(Folder _result) {

                    fetchFolder(iter, callback);

                }

                @Override

                public void onError(Throwable t) {

                    GWT.log("Error getting folder", t);

                                        app.setError(t);

                    if (t instanceof RestException)

                        app.displayError("Error getting folder: " + ((RestException) t).getHttpStatusText());

                    else

                        app.displayError("System error fetching folder: " + t.getMessage());

                }

                                @Override

                                protected void onUnauthorized(Response response) {

                                        app.sessionExpired();

                                }

            };

            getFolder.setHeader("X-Auth-Token", app.getToken());

            Scheduler.get().scheduleDeferred(getFolder);

        }

        else if (callback != null)

            callback.execute();

    }

    public void initialize(final AccountResource account, final Command callback) {

        Iterator<Folder> iter = account.getContainers().listIterator();

        fetchFolder(iter, new Command() {

            @Override

            public void execute() {

                rootDataProvider.getList().clear();

                Folder t = null;

                for (Folder c : account.getContainers()) {

                        if (c.isHome())

                            rootDataProvider.getList().add(0, c); //Pithos is always first

                        else if (c.isTrash())

                                t = c; //Keep trash for adding in the end

                        else

                                rootDataProvider.getList().add(c);

                }

                if (t != null)

                            rootDataProvider.getList().add(t);

                selectionModel.setSelected(rootDataProvider.getList().get(0), true);

                if (callback != null)

                        callback.execute();

            }

        });

    }

    public Folder getSelection() {

        return selectionModel.getSelectedObject();

    }

    public void updateFolder(final Folder folder, boolean showfiles, final Command callback, final boolean openParent) {

        if (dataProviderMap.get(folder) == null) {

            dataProviderMap.put(folder, new ListDataProvider<Folder>());

        }

        final ListDataProvider<Folder> dataProvider = dataProviderMap.get(folder);

        fetchFolder(folder, dataProvider, showfiles, new Command() {

                        @Override

                        public void execute() {

                                if (openParent)

                                        app.getFolderTreeView().openFolder(folder);

                                if (callback != null)

                                        callback.execute();

                        }

                });

    }

    public void fetchFolder(final Folder f, final ListDataProvider<Folder> dataProvider, final boolean showfiles, final Command callback) {

        String path = "/" + f.getContainer() + "?format=json&delimiter=/&prefix=" + URL.encodeQueryString(f.getPrefix());

        GetRequest<Folder> getFolder = new GetRequest<Folder>(Folder.class, app.getApiPath(), f.getOwner(), path, f) {

            @Override

            public void onSuccess(final Folder _result) {

                if (showfiles)

                    app.showFiles(_result);

                int defaultSize = app.getFolderTreeView().tree.getDefaultNodeSize();

                int size = _result.getSubfolders().size();

                if (size > defaultSize)

                        app.getFolderTreeView().tree.setDefaultNodeSize(size);

                Iterator<Folder> iter = new ArrayList<Folder>(_result.getSubfolders()).listIterator();

                fetchFolder(iter, new Command() {

                    @Override

                    public void execute() {

                        dataProvider.getList().clear();

                        dataProvider.getList().addAll(_result.getSubfolders());

                        if (callback != null)

                                callback.execute();

                    }

                });

            }

            @Override

            public void onError(Throwable t) {

                    if (retries >= MAX_RETRIES) {

                        GWT.log("Error getting folder", t);

                                        app.setError(t);

                        if (t instanceof RestException)

                            app.displayError("Error getting folder: " + ((RestException) t).getHttpStatusText());

                        else

                            app.displayError("System error fetching folder: " + t.getMessage());

                    }

                    else {//retry

                            GWT.log("Retry " + retries);

                            Scheduler.get().scheduleDeferred(this);

                    }

            }

                        @Override

                        protected void onUnauthorized(Response response) {

                                if (retries >= MAX_RETRIES)

                                        app.sessionExpired();

                    else //retry

                            Scheduler.get().scheduleDeferred(this);

                        }

        };

        getFolder.setHeader("X-Auth-Token", app.getToken());

        Scheduler.get().scheduleDeferred(getFolder);

    }

}