move task lookup logic to core

Change-Id: I25b6b0022882fb74988f509fe7eb09274a3279f8

1 files changed, 83 insertions, 0 deletions

diff --git a/org.eclipse.mylyn.tasks.core/src/org/eclipse/mylyn/internal/tasks/core/util/TasksCoreUtil.java b/org.eclipse.mylyn.tasks.core/src/org/eclipse/mylyn/internal/tasks/core/util/TasksCoreUtil.java
new file mode 100644
index 000000000..776e2a234
--- /dev/null
+++ b/org.eclipse.mylyn.tasks.core/src/org/eclipse/mylyn/internal/tasks/core/util/TasksCoreUtil.java
@@ -0,0 +1,83 @@
+/*******************************************************************************
+ * Copyright (c) 2015 Tasktop Technologies 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:
+ *     Tasktop Technologies - initial API and implementation
+ *******************************************************************************/
+
+package org.eclipse.mylyn.internal.tasks.core.util;
+
+import java.net.URL;
+import java.util.Collection;
+import java.util.List;
+
+import org.eclipse.mylyn.internal.tasks.core.AbstractTask;
+import org.eclipse.mylyn.internal.tasks.core.TaskList;
+import org.eclipse.mylyn.tasks.core.AbstractRepositoryConnector;
+import org.eclipse.mylyn.tasks.core.IRepositoryManager;
+import org.eclipse.mylyn.tasks.core.TaskRepository;
+
+import com.google.common.base.Strings;
+import com.google.common.collect.Ordering;
+
+public class TasksCoreUtil {
+	/**
+	 * Searches for a task whose URL matches
+	 * 
+	 * @return first task with a matching URL.
+	 */
+	public static AbstractTask getTaskByUrl(TaskList taskList, IRepositoryManager repositoryManager, String taskUrl) {
+		if (!Strings.isNullOrEmpty(taskUrl)) {
+			Collection<AbstractTask> tasks = taskList.getAllTasks();
+			List<AbstractTask> sortedTasks = sortTasksByRepositoryUrl(tasks);
+
+			AbstractRepositoryConnector connector = null;
+			TaskRepository repository = null;
+
+			for (AbstractTask task : sortedTasks) {
+				if (taskUrl.equals(task.getUrl())) {
+					return task;
+				} else {
+					String repositoryUrl = task.getRepositoryUrl();
+					if (repositoryUrl != null) {
+						if (repository == null || !repositoryUrl.equals(repository.getUrl())) {
+							connector = repositoryManager.getRepositoryConnector(task.getConnectorKind());
+							repository = repositoryManager.getRepository(task.getConnectorKind(),
+									task.getRepositoryUrl());
+						}
+
+						if (connector != null) {
+							URL url = connector.getBrowserUrl(repository, task);
+							if (url != null && taskUrl.equals(url.toString())) {
+								return task;
+							}
+						}
+					}
+				}
+			}
+		}
+		return null;
+	}
+
+	private static List<AbstractTask> sortTasksByRepositoryUrl(Collection<AbstractTask> tasks) {
+		List<AbstractTask> sortedTasks = new Ordering<AbstractTask>() {
+
+			@Override
+			public int compare(AbstractTask left, AbstractTask right) {
+				if (left.getRepositoryUrl() == null) {
+					return 1;
+				}
+				if (right.getRepositoryUrl() == null) {
+					return -1;
+				}
+				return left.getRepositoryUrl().compareTo(right.getRepositoryUrl());
+			}
+
+		}.nullsLast().sortedCopy(tasks);
+		return sortedTasks;
+	}
+}