| /******************************************************************************* |
| * Copyright (c) 2010 University of Illinois at Urbana-Champaign 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: |
| * UIUC - Initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.rephraserengine.core.analysis.flow; |
| |
| import java.util.HashSet; |
| import java.util.Iterator; |
| import java.util.LinkedList; |
| import java.util.List; |
| |
| import org.eclipse.rephraserengine.core.util.ReverseIterator; |
| |
| /** |
| * A node in a control flow graph. |
| * |
| * @author Jeff Overbey |
| * |
| * @param T type of data associated with each flowgraph node |
| * |
| * @since 3.0 |
| */ |
| public final class FlowGraphNode<T> |
| { |
| private final String name; |
| private final T data; |
| private final List<FlowGraphNode<T>> successors, precedessors; |
| |
| public FlowGraphNode(String name, T data) |
| { |
| this.name = name; |
| this.data = data; |
| this.successors = new LinkedList<FlowGraphNode<T>>(); |
| this.precedessors = new LinkedList<FlowGraphNode<T>>(); |
| } |
| |
| public String getName() |
| { |
| return name; |
| } |
| |
| public T getData() |
| { |
| return data; |
| } |
| |
| public void connectTo(FlowGraphNode<T> node) |
| { |
| this.successors.add(node); |
| node.precedessors.add(this); |
| } |
| |
| public void connectTo(FlowGraphNode<T>... nodes) |
| { |
| for (FlowGraphNode<T> n : nodes) |
| connectTo(n); |
| } |
| |
| public List<FlowGraphNode<T>> getSuccessors() |
| { |
| return successors; |
| } |
| |
| public Iterable<FlowGraphNode<T>> getSuccessorsInReverse() |
| { |
| return new Iterable<FlowGraphNode<T>>() |
| { |
| public Iterator<FlowGraphNode<T>> iterator() |
| { |
| return new ReverseIterator<FlowGraphNode<T>>(successors); |
| } |
| }; |
| } |
| |
| public List<FlowGraphNode<T>> getPrecedessors() |
| { |
| return precedessors; |
| } |
| |
| Iterable<FlowGraphNode<T>> subgraphInReversePostOrder() |
| { |
| final LinkedList<FlowGraphNode<T>> result = new LinkedList<FlowGraphNode<T>>(); |
| |
| this.inReversePostOrder(new Callback() |
| { |
| @Override public void handle(FlowGraphNode<T> node) |
| { |
| result.add(node); |
| } |
| }); |
| |
| return result; |
| } |
| |
| Iterable<T> subgraphDataInReversePostOrder() |
| { |
| final LinkedList<T> result = new LinkedList<T>(); |
| |
| this.inReversePostOrder(new Callback() |
| { |
| @Override public void handle(FlowGraphNode<T> node) |
| { |
| result.add(node.getData()); |
| } |
| }); |
| |
| return result; |
| } |
| |
| private void inReversePostOrder(Callback callback) |
| { |
| this.inReversePostOrder(new HashSet<FlowGraphNode<T>>(), callback); |
| } |
| |
| private void inReversePostOrder(HashSet<FlowGraphNode<T>> visited, Callback callback) |
| { |
| visited.add(this); |
| |
| for (FlowGraphNode<T> n : getSuccessorsInReverse()) |
| if (!visited.contains(n)) |
| n.inReversePostOrder(visited, callback); |
| |
| callback.handle(this); |
| } |
| |
| Iterable<FlowGraphNode<T>> subgraphInPreOrder() |
| { |
| final LinkedList<FlowGraphNode<T>> result = new LinkedList<FlowGraphNode<T>>(); |
| |
| this.inPreOrder(new Callback() |
| { |
| @Override public void handle(FlowGraphNode<T> node) |
| { |
| result.add(node); |
| } |
| }); |
| |
| return result; |
| } |
| |
| Iterable<T> subgraphDataInPreOrder() |
| { |
| final LinkedList<T> result = new LinkedList<T>(); |
| |
| this.inPreOrder(new Callback() |
| { |
| @Override public void handle(FlowGraphNode<T> node) |
| { |
| result.add(node.getData()); |
| } |
| }); |
| |
| return result; |
| } |
| |
| private void inPreOrder(Callback callback) |
| { |
| this.inPreOrder(new HashSet<FlowGraphNode<T>>(), callback); |
| } |
| |
| private void inPreOrder(HashSet<FlowGraphNode<T>> visited, Callback callback) |
| { |
| visited.add(this); |
| callback.handle(this); |
| |
| for (FlowGraphNode<T> n : getSuccessors()) |
| if (!visited.contains(n)) |
| n.inPreOrder(visited, callback); |
| } |
| |
| private abstract class Callback { public abstract void handle(FlowGraphNode<T> node); } |
| |
| @Override public String toString() |
| { |
| return String.format("%s: %s", name, data.toString()); //$NON-NLS-1$ |
| } |
| } |