package org.litesoft.sandbox.infrastructure.client;

import com.google.gwt.place.shared.*;
import com.google.gwt.user.client.ui.*;

public abstract class CachedViewSynchronousActivityFactory<CommonActivityParam extends CommonActivityParameter, View extends IsWidget, APlace extends Place>
        implements ActivityFactory.Synchronous<CommonActivityParam, View, APlace> {
    private final String mPlaceID;
    private View mCachedView;

    public CachedViewSynchronousActivityFactory( Object pPlaceID ) {
        mPlaceID = pPlaceID.toString();
    }

    @Override
    public final String getPlaceId() {
        return mPlaceID;
    }

    @Override
    public synchronized final View getView() {
        if ( mCachedView == null ) {
            mCachedView = createView();
        }
        return mCachedView;
    }

    abstract protected View createView();
}