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/*******************************************************************************
* Copyright (c) 2018 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.externalization;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import org.eclipse.mylyn.internal.tasks.core.AbstractTask;
import org.eclipse.mylyn.internal.tasks.core.AbstractTaskCategory;
import org.eclipse.mylyn.internal.tasks.core.AbstractTaskContainer;
import org.eclipse.mylyn.internal.tasks.core.ITransferList;
import org.eclipse.mylyn.internal.tasks.core.RepositoryQuery;
import org.eclipse.mylyn.internal.tasks.core.TaskCategory;
import org.eclipse.mylyn.internal.tasks.core.UnmatchedTaskContainer;
import org.eclipse.mylyn.tasks.core.ITask;
/**
* This class delegates the calls to underlying {@link ITransferList} while altering behavior of {@link #addTask(ITask)}
* and {@link #addTask(ITask, category)} methods to avoid adding tasks being loaded to task list's
* {@link UnmatchedTaskContainer} if they belong to a different task container. Instead, tasks added with
* {@link #addTask(ITask)} method are stored internally, and only pushed to underlying {@link ITransferList} during
* subsequent calls to {@link #addTask(ITask, category)} or on final {@link #commit(void)}.
* <p>
* <b>Usage</b>
* <p>
* The caller can call {@link #addTask(ITask)} and {@link #addTask(ITask, category)} methods to load task list as usual.
* <p>
* The caller is expected to call {@link #commit(void)} to add the remaining uncategorized tasks to task list.
*
* @see {@link #addTask(ITask)}
* @see {@link #addTask(ITask, AbstractTaskContainer)}
* @see {@link #commit()}
*/
class LazyTransferList implements ITransferList {
private final Map<String, ITask> untransferedTasks = new HashMap<>();
private final ITransferList taskList;
LazyTransferList(ITransferList taskList) {
this.taskList = taskList;
}
public void addCategory(TaskCategory category) {
taskList.addCategory(category);
}
public void addQuery(RepositoryQuery query) {
taskList.addQuery(query);
}
public void addTask(ITask task) {
untransferedTasks.put(task.getHandleIdentifier(), task);
}
public boolean addTask(ITask task, AbstractTaskContainer parentContainer) {
boolean result = taskList.addTask(task, commit(parentContainer));
untransferedTasks.remove(task.getHandleIdentifier());
return result;
}
public AbstractTaskCategory getContainerForHandle(String handle) {
return taskList.getContainerForHandle(handle);
}
public Collection<AbstractTask> getAllTasks() {
return taskList.getAllTasks();
}
public Set<AbstractTaskCategory> getCategories() {
return taskList.getCategories();
}
public Set<RepositoryQuery> getQueries() {
return taskList.getQueries();
}
public AbstractTask getTask(String handleIdentifier) {
AbstractTask task = (AbstractTask) untransferedTasks.get(handleIdentifier);
if (task == null) {
task = taskList.getTask(handleIdentifier);
}
return task;
}
public ITask getTask(String repositoryUrl, String taskId) {
return taskList.getTask(repositoryUrl, taskId);
}
/**
* If the container is an {@link ITask}, pushes it to task list
*
* @param container
*/
private AbstractTaskContainer commit(AbstractTaskContainer container) {
if (container instanceof ITask) {
AbstractTask task = (AbstractTask) untransferedTasks.get(container.getHandleIdentifier());
if (task != null) {
taskList.addTask(task);
untransferedTasks.remove(container.getHandleIdentifier());
}
}
return container;
}
/**
* Pushes the remaining tasks to task list
*/
public void commit() {
for (ITask task : untransferedTasks.values()) {
taskList.addTask(task);
}
untransferedTasks.clear();
}
}
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