org.eclipse.epp.mpc.ui/src/org/eclipse/epp/internal/mpc/ui/wizards/FavoritesViewer.java

/*******************************************************************************
 * Copyright (c) 2010 The Eclipse Foundation and others.
 * 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:
 *     The Eclipse Foundation - initial API and implementation
 *******************************************************************************/
package org.eclipse.epp.internal.mpc.ui.wizards;

import java.util.Collections;
import java.util.List;
import java.util.Set;

import org.eclipse.epp.internal.mpc.ui.catalog.FavoritesDiscoveryStrategy;
import org.eclipse.epp.internal.mpc.ui.catalog.MarketplaceNodeCatalogItem;
import org.eclipse.epp.internal.mpc.ui.catalog.UserActionCatalogItem;
import org.eclipse.equinox.internal.p2.discovery.AbstractDiscoveryStrategy;
import org.eclipse.equinox.internal.p2.discovery.Catalog;
import org.eclipse.equinox.internal.p2.discovery.model.CatalogItem;
import org.eclipse.equinox.internal.p2.ui.discovery.util.ControlListItem;
import org.eclipse.equinox.internal.p2.ui.discovery.wizards.CatalogConfiguration;
import org.eclipse.equinox.internal.p2.ui.discovery.wizards.CatalogViewer;
import org.eclipse.jface.viewers.StructuredViewer;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.DisposeEvent;
import org.eclipse.swt.events.DisposeListener;
import org.eclipse.swt.events.VerifyEvent;
import org.eclipse.swt.events.VerifyListener;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Text;
import org.eclipse.swt.widgets.Widget;

public class FavoritesViewer extends CatalogViewer {

	private static final String HTTPS_PREFIX = "https://"; //$NON-NLS-1$

	private static final String HTTP_PREFIX = "http://"; //$NON-NLS-1$

	private static final int MIN_URL_LENGTH = HTTP_PREFIX.length() + 5;

	private MarketplaceDiscoveryResources discoveryResources;

	private final IMarketplaceWebBrowser browser;

	private final ImportFavoritesPage importFavoritesPage;

	public FavoritesViewer(Catalog catalog, ImportFavoritesPage page, IMarketplaceWebBrowser browser,
			CatalogConfiguration configuration) {
		super(catalog, page, page.getWizard().getContainer(), configuration);
		this.importFavoritesPage = page;
		this.browser = browser;
		setAutomaticFind(false);
		setRefreshJobDelay(50L);
	}

	@Override
	protected StructuredViewer doCreateViewer(Composite container) {
		StructuredViewer viewer = super.doCreateViewer(container);
		discoveryResources = new MarketplaceDiscoveryResources(container.getDisplay());
		viewer.getControl().addDisposeListener(new DisposeListener() {
			public void widgetDisposed(DisposeEvent e) {
				discoveryResources.dispose();
				discoveryResources = null;
			}
		});
		super.getResources().dispose();
		viewer.setSorter(null);
		return viewer;
	}

	private static <T extends Widget> T findControl(Composite container, Class<T> type) {
		Control[] children = container.getChildren();
		for (Control control : children) {
			if (type.isInstance(control)) {
				return type.cast(control);
			}
			if (control instanceof Composite) {
				T childMatch = findControl((Composite) control, type);
				if (childMatch != null) {
					return childMatch;
				}
			}
		}
		return null;
	}

	@Override
	protected void doCreateHeaderControls(Composite parent) {
		//header will have two items: the label and the search field
		Label searchLabel = findControl(parent, Label.class);
		Text searchField = findControl(parent, Text.class);
		if (searchLabel != null) {
			searchLabel.setText(Messages.FavoritesViewer_searchLabel);
		}
		if (searchField != null) {
			searchField.setMessage(Messages.FavoritesViewer_searchInputDescription);
			searchField.addVerifyListener(new VerifyListener() {

				@Override
				public void verifyText(VerifyEvent e) {
					if (e.keyCode == 0 && e.start == 0 && e.end == searchField.getText().length()
							&& e.text.length() > 0) {
						filterTextChanged();
					}
				}
			});
		}
	}

	@Override
	protected void modifySelection(CatalogItem connector, boolean selected) {
		super.modifySelection(connector, selected);
	}

	@Override
	public void updateCatalog() {
		List<CatalogItem> checkedItems = getCheckedItems();
		for (CatalogItem catalogItem : checkedItems) {
			modifySelection(catalogItem, false);
		}
		super.updateCatalog();
	}

	@Override
	protected MarketplaceDiscoveryResources getResources() {
		return discoveryResources;
	}

	@Override
	protected ControlListItem<?> doCreateViewerItem(Composite parent, Object element) {
		if (element instanceof MarketplaceNodeCatalogItem) {
			//marketplace entry
			FavoritesDiscoveryItem discoveryItem = createDiscoveryItem(parent, (MarketplaceNodeCatalogItem) element);
			return discoveryItem;
		} else if (element instanceof UserActionCatalogItem) {
			return new InfoViewerItem(parent, getResources(), shellProvider, (UserActionCatalogItem) element, this);
		}
		return super.doCreateViewerItem(parent, element);
	}

	private FavoritesDiscoveryItem createDiscoveryItem(Composite parent, MarketplaceNodeCatalogItem catalogItem) {
		return new FavoritesDiscoveryItem(parent, SWT.NONE, getResources(), browser, catalogItem, this);
	}

	@Override
	protected Set<String> getInstalledFeatures(org.eclipse.core.runtime.IProgressMonitor monitor) {
		return Collections.emptySet();
	}

	@Override
	protected void doFind(final String text) {
		FavoritesDiscoveryStrategy favoritesStrategy = findFavoritesStrategy();
		if (favoritesStrategy != null) {
			favoritesStrategy.setFavoritesReference(text);
		}
		updateCatalog();
	}

	private FavoritesDiscoveryStrategy findFavoritesStrategy() {
		FavoritesDiscoveryStrategy favoritesStrategy = null;
		List<AbstractDiscoveryStrategy> discoveryStrategies = getCatalog().getDiscoveryStrategies();
		for (AbstractDiscoveryStrategy strategy : discoveryStrategies) {
			if (strategy instanceof FavoritesDiscoveryStrategy) {
				favoritesStrategy = (FavoritesDiscoveryStrategy) strategy;
				break;
			}
		}
		return favoritesStrategy;
	}

	@Override
	protected void catalogUpdated(boolean wasCancelled, boolean wasError) {
		super.catalogUpdated(wasCancelled, wasError);
		List<CatalogItem> items = getCatalog().getItems();
		for (CatalogItem catalogItem : items) {
			modifySelection(catalogItem, catalogItem.isSelected());
		}
	}
}