ProjectSearcher.java

package util.reflection;

import java.io.File;
import java.io.FilenameFilter;
import java.lang.reflect.Modifier;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Stack;

import player.gamer.Gamer;
import util.configuration.ProjectConfiguration;

public class ProjectSearcher {
	public static void main(String[] args)
	{
		System.out.println(getAllClassesThatAre(Gamer.class));
	}
	
	public static List<Class<?>> getAllClassesThatAre(Class<?> ofThisType) 
	{
		return getAllClassesThatAre(ofThisType, true);
	}
	
	public static List<Class<?>> getAllClassesThatAre(Class<?> ofThisType, boolean mustBeConcrete)
	{
		List<Class<?>> rval = new ArrayList<Class<?>>();
		for(String name : allClasses) {
			Class<?> c = null;
			try {	
				c = Class.forName(name);
			} catch (ClassNotFoundException ex)  { 
				throw new RuntimeException(ex); 
			}
			
			if(ofThisType.isAssignableFrom(c) && (!mustBeConcrete || !Modifier.isAbstract(c.getModifiers())) )
				rval.add(c);	
		}
		return rval;
	}
	
	private static List<String> allClasses = findAllClasses();
	
	private static List<String> findAllClasses()
	{
		FilenameFilter filter = new FilenameFilter() {
	        public boolean accept(File dir, String name) {
	            return !name.startsWith(".");
	        }
	    };
		
		List<String> rval = new ArrayList<String>();
		Stack<File> toProcess = new Stack<File>();		
		for(String classDirName : ProjectConfiguration.classRoots)
		    toProcess.add(new File(classDirName));
		while(!toProcess.empty())
		{
			File f = toProcess.pop();
			if(!f.exists())
				System.out.println("Could not find expected file: [" + f + "] when running ProjectSearcher.");
			if(f.isDirectory())
				toProcess.addAll(Arrays.asList(f.listFiles(filter)));
			else
			{
				if(f.getName().endsWith(".class"))
				{					
					String fullyQualifiedName = f.getPath();
					for(String classDirName : ProjectConfiguration.classRoots) {
					    fullyQualifiedName = fullyQualifiedName.replaceAll("^" + classDirName.replace(File.separatorChar, '.'), "");
					}
					fullyQualifiedName = fullyQualifiedName.replaceAll("\\.class$","");
					fullyQualifiedName = fullyQualifiedName.replaceAll("^[\\\\/]", "");
					fullyQualifiedName = fullyQualifiedName.replaceAll("[\\\\/]", ".");
					rval.add(fullyQualifiedName);
				}
			}
		}
		
		return rval;
	}
}