ProjectsPage.java

/*******************************************************************************
 * Copyright (c) 2012-2017 Codenvy, S.A.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *   Codenvy, S.A. - initial API and implementation
 *******************************************************************************/
package org.eclipse.che.ide.command.editor.page.project;

import com.google.gwt.core.client.Scheduler;
import com.google.gwt.user.client.ui.IsWidget;
import com.google.inject.Inject;
import com.google.web.bindery.event.shared.EventBus;

import org.eclipse.che.ide.api.app.AppContext;
import org.eclipse.che.ide.api.command.CommandImpl.ApplicableContext;
import org.eclipse.che.ide.api.resources.Project;
import org.eclipse.che.ide.api.resources.Resource;
import org.eclipse.che.ide.api.resources.ResourceChangedEvent;
import org.eclipse.che.ide.api.resources.ResourceChangedEvent.ResourceChangedHandler;
import org.eclipse.che.ide.api.resources.ResourceDelta;
import org.eclipse.che.ide.command.editor.EditorMessages;
import org.eclipse.che.ide.command.editor.page.AbstractCommandEditorPage;
import org.eclipse.che.ide.command.editor.page.CommandEditorPage;

import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;

/** Presenter for {@link CommandEditorPage} which allows to edit command's applicable projects. */
public class ProjectsPage extends AbstractCommandEditorPage implements ProjectsPageView.ActionDelegate,
                                                                       ResourceChangedHandler {

    private final ProjectsPageView view;
    private final AppContext       appContext;

    /** Initial value of the applicable projects list. */
    private Set<String> applicableProjectsInitial;

    @Inject
    public ProjectsPage(ProjectsPageView view,
                        AppContext appContext,
                        EditorMessages messages,
                        EventBus eventBus) {
        super(messages.pageProjectsTitle());

        this.view = view;
        this.appContext = appContext;

        eventBus.addHandler(ResourceChangedEvent.getType(), this);

        view.setDelegate(this);
    }

    @Override
    public IsWidget getView() {
        return view;
    }

    @Override
    protected void initialize() {
        final ApplicableContext context = editedCommand.getApplicableContext();

        applicableProjectsInitial = new HashSet<>(context.getApplicableProjects());

        refreshProjects();
    }

    /** Refresh 'Projects' section in the view. */
    private void refreshProjects() {
        final Map<Project, Boolean> projectsStates = new HashMap<>();

        for (Project project : appContext.getProjects()) {
            ApplicableContext context = editedCommand.getApplicableContext();
            boolean applicable = context.getApplicableProjects().contains(project.getPath());

            projectsStates.put(project, applicable);
        }

        view.setProjects(projectsStates);
    }

    @Override
    public boolean isDirty() {
        if (editedCommand == null) {
            return false;
        }

        ApplicableContext context = editedCommand.getApplicableContext();

        return !(applicableProjectsInitial.equals(context.getApplicableProjects()));
    }

    @Override
    public void onApplicableProjectChanged(Project project, boolean applicable) {
        final ApplicableContext context = editedCommand.getApplicableContext();

        if (applicable) {
            // if command is bound with one project at least
            // then remove command from the workspace
            if (context.getApplicableProjects().isEmpty()) {
                context.setWorkspaceApplicable(false);
            }

            context.addProject(project.getPath());
        } else {
            context.removeProject(project.getPath());

            // if command isn't bound to any project
            // then save it to the workspace
            if (context.getApplicableProjects().isEmpty()) {
                context.setWorkspaceApplicable(true);
            }
        }

        notifyDirtyStateChanged();
    }

    @Override
    public void onResourceChanged(ResourceChangedEvent event) {
        final ResourceDelta delta = event.getDelta();
        final Resource resource = delta.getResource();

        if (resource.isProject()) {
            // defer refreshing the projects section since appContext#getProjects may return old data
            Scheduler.get().scheduleDeferred(this::refreshProjects);
        }
    }
}