ParcelableCommand.java

package vandy.mooc.common;

import java.io.Serializable;

import android.content.Context;
import android.os.Bundle;
import android.os.Parcel;
import android.os.Parcelable;

/**
 * @@ TO DO
 */
public abstract class ParcelableCommand implements Serializable, Parcelable {
    /**
     * A UID generated by Eclipse for serialization purposes.
     */
    private static final long serialVersionUID = 2915895796465718372L;

    /**
     * Default constructor.
     */
    public ParcelableCommand() {
    }

    /**
     * Execute the command in a particular @a context, passing in
     * the @a args.
     */
    public abstract void execute(Context context,
                                 Bundle args);


    /**
     * Unexecute the command in a particular @a context.
     */
    public abstract void unexecute(Context context);

    /*
     * BELOW THIS is related to Parcelable Interface.
     */

    /**
     * A bitmask indicating the set of special object types marshaled
     * by the Parcelable.
     */
    @Override
    public int describeContents() {
        return 0;
    }

    /**
     * Write this instance out to byte contiguous memory.
     */
    @Override
    public void writeToParcel(Parcel dest,
                              int flags) {
        dest.writeSerializable(this);
    }

    /**
     * Private constructor provided for the CREATOR interface, which
     * is used to de-marshal an SongPlayingStrategy from the Parcel of data.
     * <p>
     * The order of reading in variables HAS TO MATCH the order in
     * writeToParcel(Parcel, int)
     *
     * @param in
     */
    private ParcelableCommand(Parcel in) {
        // If there were fields we'd initialize them here from the
        // Parcel parameter.
    }

    /**
     * public Parcelable.Creator for ParcelableCommand, which is an
     * interface that must be implemented and provided as a public
     * CREATOR field that generates instances of your Parcelable class
     * from a Parcel.
     */
    public static final Parcelable.Creator<ParcelableCommand> CREATOR =
        new Parcelable.Creator<ParcelableCommand>() {
        public ParcelableCommand createFromParcel(Parcel in) {
            return (ParcelableCommand) in.readSerializable(); 
        }

        public ParcelableCommand[] newArray(int size) {
            return new ParcelableCommand[size];
        }
    };
}