com.sap.dirigible.ide.repository.ui.viewer.RepositoryViewer.java Source code

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Here is the source code for com.sap.dirigible.ide.repository.ui.viewer.RepositoryViewer.java

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/*******************************************************************************
 * Copyright (c) 2014 SAP AG or an SAP affiliate company. All rights reserved.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License. 
 *******************************************************************************/

package com.sap.dirigible.ide.repository.ui.viewer;

import org.eclipse.jface.action.GroupMarker;
import org.eclipse.jface.action.MenuManager;
import org.eclipse.jface.viewers.ISelectionChangedListener;
import org.eclipse.jface.viewers.ISelectionProvider;
import org.eclipse.jface.viewers.ITreeSelection;
import org.eclipse.jface.viewers.SelectionChangedEvent;
import org.eclipse.jface.viewers.TreeViewer;
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Menu;
import org.eclipse.ui.IWorkbenchActionConstants;
import org.eclipse.ui.dialogs.FilteredTree;
import org.eclipse.ui.dialogs.PatternFilter;

import com.sap.dirigible.repository.api.ICollection;
import com.sap.dirigible.repository.api.IRepository;

/**
 * This is a TreeViewer class responsible for displaying the contents of a
 * repository.
 * 
 */
public class RepositoryViewer {

    private static final String REPOSITORY_MENU_MANAGER = "Repository Menu Manager"; //$NON-NLS-1$

    public static final String MENU_REPOSITORY = "menu.repository"; //$NON-NLS-1$

    private final TreeViewer viewer;

    private final MenuManager menuManager;

    private IRepository repository = null;

    public RepositoryViewer(Composite parent, int style) {
        PatternFilter filter = new PatternFilter();
        FilteredTree tree = new FilteredTree(parent, SWT.MULTI | SWT.H_SCROLL | SWT.V_SCROLL, filter, true);
        viewer = tree.getViewer();
        viewer.setLabelProvider(new ArtifactLabelProvider());
        viewer.setContentProvider(new ArtifactTreeContentProvider());
        viewer.addSelectionChangedListener(new ISelectionChangedListener() {
            public void selectionChanged(SelectionChangedEvent event) {
                handleSelectionChanged((ITreeSelection) event.getSelection());
            }
        });

        menuManager = new MenuManager(REPOSITORY_MENU_MANAGER, MENU_REPOSITORY); // FIXME:
        // Change!
        menuManager.add(new GroupMarker(IWorkbenchActionConstants.MB_ADDITIONS));
        final Menu menu = menuManager.createContextMenu(viewer.getControl());
        viewer.getControl().setMenu(menu);

        refresh();
    }

    public RepositoryViewer(IRepository repository, Composite parent, int style) {
        this(parent, style);
        setRepository(repository);
    }

    public Control getControl() {
        return (viewer != null) ? viewer.getControl() : null;
    }

    public TreeViewer getTreeViewer() {
        return viewer;
    }

    public void setFocus() {
        final Control control = getControl();
        if (control != null) {
            control.setFocus();
        }
    }

    public MenuManager getMenuManager() {
        return menuManager;
    }

    public ISelectionProvider getSelectionProvider() {
        return viewer;
    }

    /**
     * Changes the repository that is being displayed.
     * 
     * @param repository
     */
    public void setRepository(IRepository repository) {
        this.repository = repository;
        this.viewer.setInput(createViewerInput());
    }

    /**
     * Returns the repository that is being displayed.
     * 
     * @return
     */
    public IRepository getRepository() {
        return repository;
    }

    /**
     * Refreshes the viewer.
     * <p>
     * This method is useful for example when resources in the repository have
     * been changed to force the view to display the changes.
     */
    public void refresh() {
        final Object[] expandedElements = viewer.getExpandedElements();
        viewer.refresh();
        viewer.setExpandedElements(expandedElements);
    }

    /**
     * Checks if this viewer or any resources it holds and uses have been
     * disposed.
     * 
     * @return
     */
    public boolean isDisposed() {
        final Control control = getControl();
        return (control != null) ? control.isDisposed() : true;
    }

    /**
     * Disposes this viewer and any controls held by it.
     */
    public void dispose() {
        final Control control = getControl();
        if (control != null && !control.isDisposed()) {
            control.dispose();
        }
    }

    private void handleSelectionChanged(ITreeSelection selection) {
        final Object element = selection.getFirstElement();
        if (element instanceof RepositoryViewerResolveNode) {
            refresh();
        }
    }

    private Object createViewerInput() {
        if (repository == null) {
            return new Object[0];
        }
        final ICollection root = repository.getRoot();
        return new Object[] { root };
    }

}