com.github.spirylics.xgwt.essential.ModelEvent Maven / Gradle / Ivy

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package com.github.spirylics.xgwt.essential;


import com.google.gwt.event.shared.GwtEvent;
import com.google.web.bindery.event.shared.EventBus;

import java.util.HashMap;
import java.util.Map;

public class ModelEvent extends GwtEvent> {
    public static final Map, Type>> TYPES = new HashMap<>();

    public static  Type getType(Class clazz) {
        if (!TYPES.containsKey(clazz)) {
            TYPES.put(clazz, new Type>());
        }
        return TYPES.get(clazz);
    }

    public static  void fire(EventBus source, Class clazz, D old, D data) {
        source.fireEvent(new ModelEvent(clazz, old, data));
    }

    @Override
    public Type> getAssociatedType() {
        return getType(clazz);
    }

    @Override
    protected void dispatch(ModelHandler handler) {
        if (old == null) {
            handler.onCreateModel(data);
        } else {
            if (data == null) {
                handler.onDeleteModel(old);
            } else {
                handler.onUpdateModel(old, data);
            }
        }
    }

    final Class clazz;
    final D old;
    final D data;

    public ModelEvent(Class clazz, D old, D data) {
        this.clazz = clazz;
        this.old = old;
        this.data = data;
    }
}