InventoryItemDetailViewImpl.java

package org.sculptor.simplecqrs.query.serviceimpl;

import org.sculptor.framework.event.DynamicMethodDispatcher;
import org.sculptor.framework.event.Event;
import org.sculptor.simplecqrs.command.domain.InventoryItemCreated;
import org.sculptor.simplecqrs.command.domain.InventoryItemDeactivated;
import org.sculptor.simplecqrs.command.domain.InventoryItemRenamed;
import org.sculptor.simplecqrs.command.domain.ItemsCheckedInToInventory;
import org.sculptor.simplecqrs.command.domain.ItemsRemovedFromInventory;
import org.sculptor.simplecqrs.query.domain.InventoryItemDetails;
import org.sculptor.simplecqrs.query.exception.InventoryItemDetailsNotFoundException;
import org.springframework.stereotype.Service;

/**
 * Implementation of InventoryItemDetailView.
 */
@Service("inventoryItemDetailView")
public class InventoryItemDetailViewImpl extends InventoryItemDetailViewImplBase {

	public InventoryItemDetailViewImpl() {
	}

	public void receive(Event event) {
		DynamicMethodDispatcher.dispatch(this, event, "handle");
	}

	public void handle(InventoryItemCreated event) {
		getInventoryItemDetailsRepository().save(new InventoryItemDetails(event.getItemId(), event.getName()));
	}

	public void handle(InventoryItemRenamed event) {
		InventoryItemDetails item = tryGetItem(event.getItemId());
		item.setName(event.getNewName());
		getInventoryItemDetailsRepository().save(item);
	}

	public void handle(InventoryItemDeactivated event) {
		InventoryItemDetails item = tryGetItem(event.getItemId());
		getInventoryItemDetailsRepository().delete(item);
	}

	public void handle(ItemsCheckedInToInventory event) {
		InventoryItemDetails item = tryGetItem(event.getItemId());
		item.setCurrentCount(item.getCurrentCount() + event.getCountChange());
		getInventoryItemDetailsRepository().save(item);
	}

	public void handle(ItemsRemovedFromInventory event) {
		InventoryItemDetails item = tryGetItem(event.getItemId());
		item.setCurrentCount(item.getCurrentCount() - event.getCountChange());
		getInventoryItemDetailsRepository().save(item);
	}

	private InventoryItemDetails tryGetItem(String itemId) {
		try {
			return getInventoryItemDetailsRepository().findByKey(itemId);
		} catch (InventoryItemDetailsNotFoundException e) {
			throw new IllegalStateException("Unknown item: " + itemId);
		}
	}
}