/*
 * JBoss, Home of Professional Open Source
 * Copyright 2013, Red Hat Middleware LLC, and individual contributors
 * by the @authors tag. See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.jboss.as.jpa.hibernate5.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);
    }
}