InventoryItem.java

package org.sculptor.simplecqrs.command.domain;

import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import org.apache.commons.lang.StringUtils;
import org.sculptor.framework.event.DynamicMethodDispatcher;

/**
 * Entity representing InventoryItem.
 * <p>
 * This class is responsible for the domain object related business logic for
 * InventoryItem. Properties and associations are implemented in the generated
 * base class {@link org.sample.simplecqrs.command.domain.InventoryItemBase}.
 */
public class InventoryItem extends InventoryItemBase {

	private static final long serialVersionUID = 1L;

	protected InventoryItem() {
	}

	/**
	 * Use {@link #createNew(String, String)} for constructing new InventoryItem
	 * instances. This constructor is needed for persistence mapper.
	 */
	public InventoryItem(String itemId) {
		super(itemId);
	}

	public static InventoryItem createNew(String itemId, String name) {
		InventoryItem result = new InventoryItem(itemId);
		result.applyChange(new InventoryItemCreated(new Date(), itemId, name));
		return result;
	}

	public void rename(String newName) {
		if (StringUtils.isEmpty(newName))
			throw new IllegalArgumentException("newName");
		applyChange(new InventoryItemRenamed(new Date(), getItemId(), newName));
	}

	public void deactivate() {
		if (!isActivated())
			throw new IllegalStateException("already deactivated");
		applyChange(new InventoryItemDeactivated(new Date(), getItemId()));
	}

	public void checkIn(int some) {
		if (some <= 0)
			throw new IllegalArgumentException("must have a count greater than 0 to add to inventory");
		applyChange(new ItemsCheckedInToInventory(new Date(), getItemId(), some));
	}

	public void remove(int some) {
		if (some <= 0)
			throw new IllegalArgumentException("cant remove negative count from inventory");
		applyChange(new ItemsRemovedFromInventory(new Date(), getItemId(), some));
	}

	public void apply(InventoryItemCreated event) {
		setActivated(true);
	}

	public void apply(InventoryItemDeactivated event) {
		setActivated(false);
	}

	public void apply(Object other) {
		// ignore
	}

	private final List<InventoryItemEvent> changes = new ArrayList<InventoryItemEvent>();

	public List<InventoryItemEvent> getUncommittedChanges() {
		return changes;
	}

	public void markChangesAsCommitted() {
		changes.clear();
	}

	private void applyChange(InventoryItemEvent event, boolean isNew) {
		DynamicMethodDispatcher.dispatch(this, event, "apply");
		if (isNew) {
			changes.add(event);
		} else {
			setVersion(event.getAggregateVersion());
		}
	}

	private void applyChange(InventoryItemEvent event) {
		applyChange(event, true);
	}

	public void loadFromHistory(List<InventoryItemEvent> history) {
		for (InventoryItemEvent each : history) {
			applyChange(each, false);
		}
	}

}