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A set of components that facilitate the service creation.

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package generic;

import model.domain.object.DomainObject;

public abstract class AbstractService implements Service {
	private static final long serialVersionUID = 3583603527173873467L;

	@Override
	public boolean saveOrUpdate(T object) {

		if (isStateInvalid(object))
			throw new IllegalStateException("The object state is illegal.");

		if (!isUnique(object))
			throw new IllegalArgumentException("The object already exists.");

		preSaveOrUpdate(object);

		boolean result = false;

		if (object.getId() == 0L)
			result = getDAO().persist(object);
		else
			result = getDAO().update(object) != null;

		postSaveOrUpdate(object, result);

		return result;
	}

	protected void preSaveOrUpdate(T object) {
	}

	protected void postSaveOrUpdate(T object, boolean result) {
	}

	protected abstract GenericDAO getDAO();

	public abstract boolean isStateInvalid(T object);

	public abstract boolean isUnique(T object);

	public abstract boolean hasObject(T object);

	@Override
	public boolean remove(T object) {

		preRemove(object);

		boolean result = getDAO().remove(object);

		postRemove(object, result);

		return result;
	}

	protected void preRemove(T object) {
	}

	protected void postRemove(T object, boolean result) {
	}
}