WebModelManager.java

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package jarmos.io;

import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URI;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class WebModelManager extends AModelManager {

    public static final String DIRLIST_FILE = "models.txt";

    private URL rooturl;

    public WebModelManager(URL rooturl) {
        super();
        this.rooturl = rooturl;
    }

    public WebModelManager(String url) throws MalformedURLException {
        this(new URL(url));
    }

    // /**
    // * @return The root web url
    // */
    // public String getRootURL() {
    // return rooturl;
    // }

    @Override
    public ClassLoader getClassLoader() {
        try {
            URL url = new URL(rooturl + "/" + getModelDir() + "/" + CLASSES_JARFILE);
            return new URLClassLoader(new URL[] { url }, super.getClassLoader());
        } catch (MalformedURLException e) {
            return super.getClassLoader();
        }
    }

    /*
     * (non-Javadoc)
     * 
     * @see kermor.java.io.IModelManager#getInStream(java.lang.String)
     */
    @Override
    protected InputStream getInStreamImpl(String filename) throws IOException {
        URL u = new URL(rooturl + "/" + getModelDir() + "/" + filename);
        return u.openStream();
    }

    @Override
    protected String[] getFolderList() throws IOException {
        URL u = new URL(rooturl + "/" + DIRLIST_FILE);
        Scanner s = new Scanner(u.openStream());
        List<String> folders = new ArrayList<String>();
        while (s.hasNextLine()) {
            folders.add(s.nextLine());
        }
        s.close();
        if (folders.size() > 0) {
            return folders.toArray(new String[0]);
        } else {
            return new String[0];
        }
    }

    @Override
    public boolean modelFileExists(String filename) {
        try {
            getInStreamImpl(filename).close();
            return true;
        } catch (IOException e) {
            return false;
        }
    }

    @Override
    public URI getModelURI() {
        return URI.create(rooturl.toString());
    }

    @Override
    protected String getLoadingMessage() {
        return "Reading remote models";
    }

}