A Multiple Rooted Resource Loader

MultiRootResourceLoader.java

import java.io.File;
import java.io.IOException;
import java.net.URL;

import org.dojotoolkit.compressor.JSCompressorFactory;
import org.dojotoolkit.compressor.JSCompressorResourceLoader;

public class MultiRootResourceLoader extends JSCompressorResourceLoader {
	private File[] roots = null;

	public MultiRootResourceLoader(File[] roots, JSCompressorFactory jsCompressorFactory) {
		super(jsCompressorFactory);
		this.roots = roots;
	}
	
	public MultiRootResourceLoader(File[] roots) {
		super(null);
		this.roots = roots;
	}
	
	protected URL _getResource(String path) throws IOException {
		for (File root : roots) {
			URL url = searchRoot(root, path);
			if (url != null) {
				return url;
			}
		}
		return null;
	}
	
	private URL searchRoot(File root, String path) throws IOException {
		File resourceFile = new File(root, path);
		if (resourceFile.exists()) {
			timestampLookup.put(path, resourceFile.toURI().toURL());
			return resourceFile.toURI().toURL();
		} else {
			return null;
		}
	}
}