Synnefo » Pithos Web Client

/*

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

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

 * without modification, are permitted provided that the following

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 *

 *   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

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 *      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,

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

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

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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.othersharedtree;

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

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

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

import gr.grnet.pithos.web.client.foldertree.AccountResource;

import gr.grnet.pithos.web.client.foldertree.File;

import gr.grnet.pithos.web.client.foldertree.Folder;

import gr.grnet.pithos.web.client.mysharedtree.MysharedTreeView;

import gr.grnet.pithos.web.client.othersharedtree.OtherSharedTreeView.Templates;

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

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

import java.util.HashMap;

import java.util.HashSet;

import java.util.Iterator;

import java.util.Map;

import java.util.Set;

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

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

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.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.text.shared.SafeHtmlRenderer;

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.SelectionChangeEvent;

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

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

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

public class OtherSharedTreeViewModel implements TreeViewModel {

    protected Pithos app;

    String dummy = "No shares by others yet";

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

       @Override

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

            String html = AbstractImagePrototype.create(OtherSharedTreeView.images.folderYellow()).getHTML();

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

            safeHtmlBuilder.append(Templates.INSTANCE.nameSpan(folder.getName()));

        }

        @Override

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

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

                    final int x = event.getClientX();

                    final int y = event.getClientY();

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

                app.scheduleFolderHeadCommand(folder, new Command() {

                                        @Override

                                        public void execute() {

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

                                menu.setPopupPosition(x, y);

                                menu.show();

                                        }

                                });

            }

        }

    };

    protected ListDataProvider<String> userLevelDataProvider = new ListDataProvider<String>();

    protected Map<String, ListDataProvider<Folder>> userDataProviderMap = new HashMap<String, ListDataProvider<Folder>>();

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

    protected SingleSelectionModel<Folder> selectionModel;

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

        app = _app;

        this.selectionModel = selectionModel;

    }

    @Override

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

        if (value == null) {

                fetchSharingUsers(null);

            return new DefaultNodeInfo<String>(userLevelDataProvider, new TextCell(new SafeHtmlRenderer<String>() {

                                @Override

                                public SafeHtml render(String object) {

                    SafeHtmlBuilder builder = new SafeHtmlBuilder();

                    render(object, builder);

                    return builder.toSafeHtml();

                                }

                                @Override

                                public void render(String object, SafeHtmlBuilder builder) {

                    if (!object.equals(dummy)) {

                            String html = AbstractImagePrototype.create(OtherSharedTreeView.images.myShared()).getHTML();

                            builder.appendHtmlConstant(html).appendHtmlConstant(" ");

                    }

                    builder.append(OtherSharedTreeView.Templates.INSTANCE.nameSpan(object));

                                }

                        }), null, null);

        }

        else if (value instanceof String) {

                        String username = (String) value;

                        if (userDataProviderMap.get(username) == null) {

                                userDataProviderMap.put(username, new ListDataProvider<Folder>());

                        }

                        final ListDataProvider<Folder> dataProvider = userDataProviderMap.get(username);

                        fetchSharedContainers(username, dataProvider, null);

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

        }

        else {

            final Folder f = (Folder) value;

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

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

            }

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

            fetchFolder(f, dataProvider, false, null);

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

        }

    }

    private void fetchSharingUsers(final Command callback) {

        GetRequest<SharingUsers> getSharingUsers = new GetRequest<SharingUsers>(SharingUsers.class, app.getApiPath(), "", "?format=json") {

            @Override

            public void onSuccess(final SharingUsers _result) {

                userLevelDataProvider.getList().clear();

                userLevelDataProvider.getList().addAll(_result.getUsers());

                if (userLevelDataProvider.getList().isEmpty())

                        userLevelDataProvider.getList().add(dummy);

                Iterator<String> iter = _result.getUsers().iterator();

                fetchSharedContainers(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();

                        }

        };

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

        Scheduler.get().scheduleDeferred(getSharingUsers);

        }

        protected void fetchSharedContainers(final Iterator<String> iter, final Command callback) {

                if (iter.hasNext()) {

                        String username = iter.next();

                        if (userDataProviderMap.get(username) == null) {

                                userDataProviderMap.put(username, new ListDataProvider<Folder>());

                        }

                        final ListDataProvider<Folder> dataProvider = userDataProviderMap.get(username);

                        fetchSharedContainers(username, dataProvider, new Command() {

                                @Override

                                public void execute() {

                                        fetchSharedContainers(iter, callback);

                                }

                        });

                }

                else

                        if (callback != null)

                                callback.execute();

        }

        @Override

    public boolean isLeaf(Object o) {

                if (o == null)

                        return userLevelDataProvider.getList().isEmpty();

                else if (o instanceof Folder) {

            Folder f = (Folder) o;

            return f.getSubfolders().isEmpty();

        }

                else {

                        ListDataProvider<Folder> dp = userDataProviderMap.get(o);

                        if (dp != null)

                                return dp.getList().isEmpty();

                        return true;

                }

    }

        private void fetchSharedContainers(final String username, final ListDataProvider<Folder> dataProvider, final Command callback) {

                GetRequest<AccountResource> getUserSharedContainers = new GetRequest<AccountResource>(AccountResource.class, app.getApiPath(), username, "?format=json") {

                        @Override

                        public void onSuccess(AccountResource _result) {

                            final ListDataProvider<Folder> tempProvider = new ListDataProvider<Folder>();

                                Iterator<Folder> iter = _result.getContainers().iterator();

                                fetchFolder(username, iter, tempProvider, new Command() {

                                        @Override

                                        public void execute() {

                                                dataProvider.getList().clear();

                                                dataProvider.getList().addAll(tempProvider.getList());

                                                if (callback != null)

                                                        callback.execute();

                                        }

                                });

                        }

                        @Override

                        public void onError(Throwable t) {

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

                                app.setError(t);

                if (t instanceof RestException)

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

                else

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

                        }

                        @Override

                        protected void onUnauthorized(Response response) {

                                app.sessionExpired();

                        }

                };

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

                Scheduler.get().scheduleDeferred(getUserSharedContainers);

        }

        protected void fetchFolder(final String username, final Iterator<Folder> iter, final ListDataProvider<Folder> dataProvider, 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(), username, path, f) {

                @Override

                public void onSuccess(Folder _result) {

                               dataProvider.getList().add(_result);

                    fetchFolder(username, iter, dataProvider, 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 Folder getSelection() {

        return selectionModel.getSelectedObject();

    }

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

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

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

        }

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

        fetchFolder(folder, dataProvider, showfiles, callback);

    }

    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);

                Iterator<Folder> iter = _result.getSubfolders().iterator();

                fetchFolder(_result.getOwner(), iter, dataProvider, new Command() {

                    @Override

                    public void execute() {

                        dataProvider.getList().clear();

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

                        app.getOtherSharedTreeView().updateChildren(f);

                        if (callback != null)

                                callback.execute();

                    }

                });

            }

            @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);

    }

    public void initialize(Command callback) {

            fetchSharingUsers(callback);

    }

}