// Copyright 2012 Georg-August-Universität Göttingen, Germany // // 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 de.ugoe.cs.autoquest.tasktrees.treeimpl; import de.ugoe.cs.autoquest.tasktrees.treeifc.ITask; import de.ugoe.cs.autoquest.tasktrees.treeifc.ITaskInstance; import de.ugoe.cs.autoquest.tasktrees.treeifc.ITaskInstanceVisitor; /** *
* this is the default implementation of the interface {@link ITaskInstance}. It * does not do anything fancy except implementing the interface. *
* * @author Patrick Harms */ class TaskInstance implements ITaskInstance { /** ** creates a new id for a task instance using {@link #temporalId} by * incrementing it an returning its current value. Resets the counter if * {@link Integer.MAX_VALUE} is reached. *
* * @return a new unique id for a task instance as long as * {@link #temporalId} does not overflow */ private static synchronized int getNewId() { if (temporalId == Integer.MAX_VALUE) { temporalId = 0; } return temporalId++; } /** ** default serial version UID *
*/ private static final long serialVersionUID = 1L; /** ** used as a counter to generate new ids for each newly created task * instance. May overflow. *
*/ private static int temporalId = 0; /** ** the task instantiated by this task instance *
*/ private ITask task; /** ** the id of the task instance (unique throughout the system as long as * {@link #temporalId} does not overflow. *
*/ private final int id; /** ** instantiated the task instance with the task that is instantiated by the * instance. It also assigns a unique id to the instance using * {@link #getNewId()}. *
*/ TaskInstance(ITask task) { this.task = task; id = getNewId(); } /* * (non-Javadoc) * * @see de.ugoe.cs.autoquest.tasktrees.treeifc.ITaskInstance#accept( * ITaskInstanceVisitor) */ @Override public void accept(ITaskInstanceVisitor visitor) { visitor.visit(this); } /* * (non-Javadoc) * * @see java.lang.Object#clone() */ @Override public synchronized ITaskInstance clone() { TaskInstance clone = null; try { clone = (TaskInstance) super.clone(); } catch (final CloneNotSupportedException e) { // this should never happen. Therefore simply dump the exception e.printStackTrace(); } return clone; } /* * (non-Javadoc) * * @see * de.ugoe.cs.autoquest.tasktrees.treeifc.TaskTreeNode#equals(TaskTreeNode) */ @Override public boolean equals(ITaskInstance taskInstance) { // task instances are only equal if they are identical or if they have // the same id // (may happen, if they are cloned) return (this == taskInstance) || (this.hashCode() == taskInstance.hashCode()); } /* * (non-Javadoc) * * @see de.ugoe.cs.autoquest.tasktrees.treeifc.ITaskInstance#getTask() */ @Override public ITask getTask() { return task; } /* * (non-Javadoc) * * @see java.lang.Object#hashCode() */ @Override public synchronized int hashCode() { return id; } /** ** used to update the task represented through this instance *
* * @param task * the task to set */ void setTask(ITask task) { this.task = task; } /* * (non-Javadoc) * * @see java.lang.Object#toString() */ @Override public synchronized String toString() { final StringBuffer result = new StringBuffer(); result.append(task.getType()); result.append(" #"); result.append(task.getId()); if (task.getDescription() != null) { result.append(" ("); result.append(task.getDescription()); result.append(')'); } /* * if (children != null) { result.append(", "); * result.append(children.size()); result.append(" children"); } */ return result.toString(); } }