OrderedWalker.java

package fileWalker;

import java.io.File;
import java.io.IOException;
import java.nio.file.Path;
import java.util.Arrays;
import java.util.LinkedList;
import java.util.List;

public class OrderedWalker extends SourceFileWalker
{
	FileNameMatcher matcher = new FileNameMatcher();
	List<SourceFileListener> listeners = new LinkedList<SourceFileListener>();
	
	public OrderedWalker()
	{
		setFilenameFilter(DEFAULT_FILENAME_FILTER);
	}	
	
	@Override
	public void setFilenameFilter(String filter)
	{
		matcher.setFilenameFilter(filter);
	}

	@Override
	public void addListener(SourceFileListener listener)
	{
		listeners.add(listener);
	}

	@Override
	protected void walkExistingFileOrDirectory(String dirOrFileName)
			throws IOException
	{
		walk(dirOrFileName);
	}

	private void walk(String dirOrFileName)
	{
		File file = new File(dirOrFileName);
		File[] dirContent = file.listFiles();
		Path path = file.toPath();
		
		
		// if this is not a directory
		if(dirContent == null) return;
		Arrays.sort(dirContent);
		
		reportDirectoryEnter(path);
		
		for(File f : dirContent){
			Path filePath = f.toPath();
			String absolutePath = f.getAbsolutePath();
			
			if(f.isDirectory()){	
				walk(absolutePath);
				continue;
			}
			
			if(matcher.fileMatches(filePath))
				reportFile(filePath);
		}
	
		reportDirectoryLeave(path);
	}

	private void reportDirectoryEnter(Path path)
	{
		for(SourceFileListener listener: listeners )
			listener.preVisitDirectory(path);
	}
	
	private void reportDirectoryLeave(Path path)
	{
		for(SourceFileListener listener: listeners )
			listener.postVisitDirectory(path);
	}

	private void reportFile(Path path)
	{
		for(SourceFileListener listener: listeners )
			listener.visitFile(path);

	}

	
}