/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2015, Red Hat, Inc., and individual contributors
 * as indicated by the @author tags. See the copyright.txt file in the
 * distribution for a full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package org.jboss.as.jpa.hibernate4.scan;

import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.ObjectStreamField;
import java.net.URISyntaxException;
import java.net.URL;

import org.jboss.vfs.VFS;
import org.jboss.vfs.VirtualFile;

/**
 * @author Steve Ebersole
 */
public class VirtualFileAdaptor {
    private static final long serialVersionUID = -4509594124653184347L;

    private static final ObjectStreamField[] serialPersistentFields = {
            new ObjectStreamField("path", String.class)
    };

    /**
     * Minimal info to get full vfs file structure
     */
    private String path;
    /**
     * The virtual file
     */
    private transient VirtualFile file;

    public VirtualFileAdaptor(VirtualFile file) {
        this.file = file;
    }

    public VirtualFileAdaptor(String path) {
        if (path == null) { throw new IllegalArgumentException("Null path"); }

        this.path = path;
    }

    /**
     * Get the virtual file.
     * Create file from root url and path if it doesn't exist yet.
     *
     * @return virtual file root
     * @throws IOException for any error
     */
    @SuppressWarnings("deprecation")
    protected VirtualFile getFile() throws IOException {
        if (file == null) {
            file = VFS.getChild(path);
        }
        return file;
    }

    @SuppressWarnings("deprecation")
    public VirtualFileAdaptor findChild(String child) throws IOException {
        VirtualFile vf = getFile().getChild(child);
        return new VirtualFileAdaptor(vf);
    }

    public URL toURL() {
        try {
            return getFile().toURL();
        } catch (Exception e) {
            return null;
        }
    }

    private void writeObject(ObjectOutputStream out) throws IOException, URISyntaxException {
        String pathName = path;
        if (pathName == null) { pathName = getFile().getPathName(); }

        ObjectOutputStream.PutField fields = out.putFields();
        fields.put("path", pathName);
        out.writeFields();
    }

    private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException {
        ObjectInputStream.GetField fields = in.readFields();
        path = (String) fields.get("path", null);
    }
}