- /**
- * Licensed to the Apache Software Foundation (ASF) under one
- * or more contributor license agreements. See the NOTICE file
- * distributed with this work for additional information
- * regarding copyright ownership. The ASF licenses this file
- * to you 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.apache.hadoop.eclipse.dfs;
- import java.io.IOException;
- import org.apache.hadoop.eclipse.server.HadoopServer;
- import org.eclipse.core.runtime.IProgressMonitor;
- import org.eclipse.core.runtime.IStatus;
- import org.eclipse.core.runtime.Status;
- import org.eclipse.core.runtime.jobs.Job;
- /**
- * DFS Content representation of a HDFS location
- */
- public class DFSLocation implements DFSContent {
- private final DFSContentProvider provider;
- private final HadoopServer location;
- private DFSContent rootFolder = null;
- DFSLocation(DFSContentProvider provider, HadoopServer server) {
- this.provider = provider;
- this.location = server;
- }
- /* @inheritDoc */
- @Override
- public String toString() {
- return this.location.getLocationName();
- }
- /*
- * Implementation of DFSContent
- */
- /* @inheritDoc */
- public DFSContent[] getChildren() {
- if (this.rootFolder == null) {
- /*
- * DfsFolder constructor might block as it contacts the NameNode: work
- * asynchronously here or this will potentially freeze the UI
- */
- new Job("Connecting to DFS " + location) {
- @Override
- protected IStatus run(IProgressMonitor monitor) {
- try {
- rootFolder = new DFSFolder(provider, location);
- return Status.OK_STATUS;
- } catch (IOException ioe) {
- rootFolder =
- new DFSMessage("Error: " + ioe.getLocalizedMessage());
- return Status.CANCEL_STATUS;
- } finally {
- // Under all circumstances, update the UI
- provider.refresh(DFSLocation.this);
- }
- }
- }.schedule();
- return new DFSContent[] { new DFSMessage("Connecting to DFS "
- + toString()) };
- }
- return new DFSContent[] { this.rootFolder };
- }
- /* @inheritDoc */
- public boolean hasChildren() {
- return true;
- }
- /* @inheritDoc */
- public void refresh() {
- this.rootFolder = null;
- this.provider.refresh(this);
- }
- /*
- * Actions
- */
- /**
- * Refresh the location using a new connection
- */
- public void reconnect() {
- this.refresh();
- }
- }