org.uberfire.client.editors.fileexplorer.FileExplorerView.java Source code

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Here is the source code for org.uberfire.client.editors.fileexplorer.FileExplorerView.java

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/*
 * Copyright 2012 JBoss Inc
 *
 * 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 org.uberfire.client.editors.fileexplorer;

import com.google.gwt.core.client.GWT;
import com.google.gwt.event.logical.shared.OpenEvent;
import com.google.gwt.event.logical.shared.OpenHandler;
import com.google.gwt.event.logical.shared.SelectionEvent;
import com.google.gwt.event.logical.shared.SelectionHandler;
import com.google.gwt.user.client.ui.Composite;
import com.google.gwt.user.client.ui.Tree;
import com.google.gwt.user.client.ui.TreeItem;
import org.uberfire.backend.repositories.Repository;
import org.uberfire.backend.vfs.Path;
import org.uberfire.client.common.Util;
import org.uberfire.client.resources.CoreImages;

import static org.kie.commons.validation.PortablePreconditions.*;

public class FileExplorerView extends Composite implements FileExplorerPresenter.View {

    TreeItem rootTreeItem = null;

    final Tree tree = new Tree();

    private static CoreImages images = GWT.create(CoreImages.class);

    private static final String REPOSITORY_ID = "repositories";
    private static final String LAZY_LOAD = "Loading...";

    private FileExplorerPresenter presenter = null;

    @Override
    public void init(final FileExplorerPresenter presenter) {
        this.presenter = presenter;
        rootTreeItem = tree.addItem(Util.getHeaderSafeHtml(images.packageIcon(), "Repositories"));
        rootTreeItem.setState(true);
        initWidget(tree);

        tree.addOpenHandler(new OpenHandler<TreeItem>() {
            @Override
            public void onOpen(final OpenEvent<TreeItem> event) {
                if (needsLoading(event.getTarget()) && event.getTarget().getUserObject() instanceof Path) {
                    presenter.loadDirectoryContent(new FileExplorerItemImpl(event.getTarget()),
                            (Path) event.getTarget().getUserObject());
                }
            }
        });

        tree.addSelectionHandler(new SelectionHandler<TreeItem>() {
            @Override
            public void onSelection(SelectionEvent<TreeItem> event) {
                final Object userObject = event.getSelectedItem().getUserObject();
                if (userObject != null && userObject instanceof Path) {
                    final Path path = (Path) userObject;
                    presenter.redirect(path);
                } else if (userObject != null && userObject instanceof Repository) {
                    final Repository root = (Repository) userObject;
                    presenter.redirect(root);
                } else if (event.getSelectedItem().getUserObject() instanceof String
                        && (event.getSelectedItem().getUserObject()).equals(REPOSITORY_ID)) {
                    presenter.redirectRepositoryList();
                }
            }
        });

    }

    @Override
    public void setFocus() {
        tree.setFocus(true);
    }

    @Override
    public void reset() {
        rootTreeItem.setUserObject(REPOSITORY_ID);
        rootTreeItem.addItem(Util.toSafeHtml(LAZY_LOAD));

        rootTreeItem.removeItems();
    }

    @Override
    public void removeIfExists(final Repository repo) {
        //TODO {porcelli} implement!
    }

    @Override
    public void addNewRepository(final Repository repo) {
        final TreeItem repositoryRootItem = rootTreeItem
                .addItem(Util.getHeaderSafeHtml(images.packageIcon(), repo.getAlias()));
        repositoryRootItem.setState(true);
        repositoryRootItem.setUserObject(repo);

        presenter.loadDirectoryContent(new FileExplorerItemImpl(repositoryRootItem), repo.getRoot());
    }

    private boolean needsLoading(TreeItem item) {
        return item.getChildCount() == 1 && LAZY_LOAD.equals(item.getChild(0).getText());
    }

    private static class FileExplorerItemImpl implements FileExplorerPresenter.FileExplorerItem {

        private final TreeItem parent;

        FileExplorerItemImpl(final TreeItem treeItem) {
            this.parent = checkNotNull("parent", treeItem);
        }

        @Override
        public void addDirectory(final Path child) {
            checkCleanupLoading();

            final TreeItem newDirectory = parent
                    .addItem(Util.getHeaderSafeHtml(images.openedFolder(), child.getFileName()));
            newDirectory.addItem(LAZY_LOAD);
            newDirectory.setUserObject(child);
        }

        @Override
        public void addFile(final Path child) {
            checkCleanupLoading();

            final TreeItem newFile = parent.addItem(Util.getHeaderSafeHtml(images.file(), child.getFileName()));
            newFile.setUserObject(child);
        }

        private void checkCleanupLoading() {
            if (parent.getChild(0) != null && parent.getChild(0).getUserObject() == null) {
                parent.getChild(0).remove();
            }
        }

    }

}