// 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.usability.tasktree.filter;
import java.util.Stack;
import com.google.common.base.Predicate;
import de.ugoe.cs.autoquest.eventcore.IEventTarget;
import de.ugoe.cs.autoquest.eventcore.IEventType;
import de.ugoe.cs.autoquest.tasktrees.treeifc.ITaskTree;
import de.ugoe.cs.autoquest.tasktrees.treeifc.ITaskTreeNode;
/**
*
* TODO comment
*
*
* @author Alexander Deicke
*/
public class IterativeDFSFilterStrategy implements TaskTreeFilterStrategy {
private FilterStatistic filterStatistic;
@SuppressWarnings("unchecked")
@Override
public FilterStatistic filter(ITaskTree taskTree, EventTargetFilter eventTarget) {
Predicate filterPredicate = eventTarget.filterPredicate();
this.filterStatistic = new FilterStatistic(filterPredicate);
traverse(taskTree);
return this.filterStatistic;
}
@SuppressWarnings("unchecked")
@Override
public FilterStatistic filter(ITaskTree taskTree, EventTypeFilter eventType) {
Predicate filterPredicate = eventType.filterPredicate();
this.filterStatistic = new FilterStatistic(filterPredicate);
traverse(taskTree);
return this.filterStatistic;
}
@SuppressWarnings("unchecked")
@Override
public FilterStatistic filter(ITaskTree taskTree, TaskTreeNodeTypeFilter nodeType) {
Predicate filterPredicate = nodeType.filterPredicate();
this.filterStatistic = new FilterStatistic(filterPredicate);
traverse(taskTree);
return this.filterStatistic;
}
private void traverse(ITaskTree taskTree) {
Stack unvisitedNodes = new Stack();
unvisitedNodes.push(taskTree.getRoot());
while (stillUnvisitedNodes(unvisitedNodes)) {
ITaskTreeNode node = unvisitedNodes.pop();
processCurrentNode(node);
processChildrenOfCurrentNode(unvisitedNodes, node);
}
}
private boolean stillUnvisitedNodes(Stack unvisitedNodes) {
return !unvisitedNodes.isEmpty();
}
private void processCurrentNode(ITaskTreeNode node) {
this.filterStatistic.addNode(node);
}
private void processChildrenOfCurrentNode(Stack unvisitedNodes,
ITaskTreeNode node)
{
for (ITaskTreeNode child : node.getChildren()) {
unvisitedNodes.push(child);
}
}
}