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

 * 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.

 */

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

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

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

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

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

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

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

import gr.grnet.pithos.web.client.tagtree.TagTreeView.Templates;

import java.util.ArrayList;

import java.util.Iterator;

import java.util.List;

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.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.safehtml.shared.SafeHtml;

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

import com.google.gwt.text.shared.SafeHtmlRenderer;

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 TagTreeViewModel implements TreeViewModel {

    private Cell<Tag> tagCell = new AbstractCell<Tag>(ContextMenuEvent.getType().getName()) {

       @Override

        public void render(Context context, Tag tag, SafeHtmlBuilder safeHtmlBuilder) {

            String html = AbstractImagePrototype.create(TagTreeView.images.tag()).getHTML();

            safeHtmlBuilder.appendHtmlConstant(html);

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

        }

        @Override

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

            if (event.getType().equals(com.google.gwt.event.dom.client.ContextMenuEvent.getType().getName())) {

                TagTreeViewModel.this.selectionModel.setSelected(tag, true);

            }

        }

    };

    private ListDataProvider<String> rootDataProvider = new ListDataProvider<String>();

    private ListDataProvider<Tag> tagDataProvider = new ListDataProvider<Tag>();

    protected SingleSelectionModel<Tag> selectionModel;

    protected Pithos app;

    public TagTreeViewModel(Pithos _app, SingleSelectionModel<Tag> selectionModel) {

        app = _app;

        this.selectionModel = selectionModel;

    }

    @Override

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

        if (value == null) {

            return new DefaultNodeInfo<String>(rootDataProvider, 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) {

                    String html = AbstractImagePrototype.create(TagTreeView.images.tag()).getHTML();

                    builder.appendHtmlConstant(html);

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

                }

            }), null, null);

        }

        else if (value instanceof String) {

            return new DefaultNodeInfo<Tag>(tagDataProvider, tagCell, selectionModel, null);

        }

        else

            return null;

    }

    @Override

    public boolean isLeaf(Object o) {

        if (o == null)

            return false;

        if (o instanceof String)

            return tagDataProvider.getList().isEmpty();

                return true;

    }

    public Tag getSelection() {

        return selectionModel.getSelectedObject();

    }

    public void updateTag(Tag tag) {

        fetchTag(tag);

    }

    public void fetchTag(Tag t) {

        AccountResource account = app.getAccount();

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

        fetchTag(iter, t, new ArrayList<FileFolderResource>());

    }

    protected void fetchTag(final Iterator<Folder> iter, final Tag t, final List<FileFolderResource> files) {

        if (iter.hasNext()) {

            Folder f = iter.next();

            String path = f.getUri() + "?format=json&meta=" + t.getName();

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

                @Override

                public void onSuccess(Folder _result) {

                    files.addAll(_result.getFiles());

                    fetchTag(iter, t, files);

                }

                @Override

                public void onError(Throwable th) {

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

                                        app.setError(th);

                    if (th instanceof RestException)

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

                    else

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

                }

                                @Override

                                protected void onUnauthorized(Response response) {

                                        app.sessionExpired();

                                }

            };

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

            Scheduler.get().scheduleDeferred(getFolder);

        }

        else {

            app.showFiles(files);

        }

    }

    public void initialize(List<Tag> allTags) {

        tagDataProvider.getList().addAll(allTags);

        rootDataProvider.getList().add("Tags");

    }

}