GenericMemento.java

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package com.arcle.rmt.superwaba.model.imp;

import waba.util.Vector;

import superwaba.ext.xplat.io.Storable;
import superwaba.ext.xplat.io.DataStream;

import com.arcle.rmt.xplat.util.List;
import com.arcle.rmt.superwaba.util.VectorListAdapter;

public abstract class GenericMemento implements Storable {

    public GenericMemento(Mementoable originator) {
        theOriginator = originator;
    }

    //-----------------------------------------------------------------------
    // Storable methods

    public abstract Storable getInstance();

    public abstract byte getID();

    public abstract void saveState(DataStream data);

    public abstract void loadState(DataStream data);


    //-----------------------------------------------------------------------
    // Public Methods

    public Mementoable getOriginator() {
        return theOriginator;
    }

    //------------------------------------------------------------------------
    // Factory Methods

    public List createList(int initCapacity) {
        return new VectorListAdapter(new Vector(initCapacity));
    }


    //------------------------------------------------------------------------
    // Own protected methods

    protected void saveList(List v, DataStream stream) {
        int numElems = v.size();
        stream.writeInt(numElems);
        for (int i=0; i<numElems; i++) {
            saveMementoable((Mementoable)v.get(i), stream);
        }
    }

    protected List loadList(DataStream stream, MementoableFactory factory) {
        int numElems = stream.readInt();
        List v = createList(numElems);
        for (int i=0; i<numElems; i++) {
            v.add(loadMementoable(stream, factory));
        }
        return v;
    }

    protected static void saveMementoable(Mementoable m, DataStream stream) {
        Storable memento = (Storable) m.createMemento();
        memento.saveState(stream);
    }

    protected static Mementoable loadMementoable(DataStream stream, MementoableFactory factory) {
        Mementoable object = factory.createOriginator();
        GenericMemento memento = object.createMemento();
        memento.loadState(stream);
        object.setMemento(memento);
        return object;
    }

    private Mementoable theOriginator = null;
}

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