framework/application/kernel/mem/src/main/java/org/ldp4j/application/kernel/impl/InMemoryResource.java
@Override
	public <T extends Resource> T attach(String attachmentId, ResourceId resourceId, Class<? extends T> clazz) {
		checkNotNull(attachmentId,"Attachment identifier cannot be null");
		checkNotNull(resourceId,"Attached resource identifier cannot be null");
		checkNotNull(clazz,"Attached resource class cannot be null");
		AttachmentId aId = AttachmentId.createId(attachmentId,resourceId);
		checkState(!attachments.containsKey(aId),"Resource '%s' is already attached as '%s'",resourceId,attachmentId);
		checkState(!attachmentsById.containsKey(attachmentId),"A resource is already attached as '%s'",attachmentId);
		checkState(!attachmentsByResourceId.containsKey(resourceId),"Resource '%s' is already attached",resourceId);
		ResourceTemplate attachmentTemplate=super.getTemplate(resourceId);
		checkState(Resources.areCompatible(clazz,attachmentTemplate),"Attachment '%s' is not of type '%s' (%s)",attachmentId,clazz.getCanonicalName(),attachmentTemplate.getClass().getCanonicalName());
		InMemoryResource newResource=createChild(resourceId,attachmentTemplate);
		InMemoryAttachment newAttachment = new InMemoryAttachment(aId,this.versionGenerator.nextVersion(attachmentId));
		attachments.put(newAttachment.attachmentId(),newAttachment);
		attachmentsById.put(aId.id(),aId);
		attachmentsByResourceId.put(aId.resourceId(),aId);
		return clazz.cast(newResource);
	}
@Override
	public <T extends Resource> T attach(String attachmentId, ResourceId resourceId, Class<? extends T> clazz) {
		checkNotNull(attachmentId,"Attachment identifier cannot be null");
		checkNotNull(resourceId,"Attached resource identifier cannot be null");
		checkNotNull(clazz,"Attached resource class cannot be null");
		AttachmentId aId = AttachmentId.createId(attachmentId,resourceId);
		checkState(!attachments.containsKey(aId),"Resource '%s' is already attached as '%s'",resourceId,attachmentId);
		checkState(!attachmentsById.containsKey(attachmentId),"A resource is already attached as '%s'",attachmentId);
		checkState(!attachmentsByResourceId.containsKey(resourceId),"Resource '%s' is already attached",resourceId);
		ResourceTemplate attachmentTemplate=super.getTemplate(resourceId);
		checkState(Resources.areCompatible(clazz,attachmentTemplate),"Attachment '%s' is not of type '%s' (%s)",attachmentId,clazz.getCanonicalName(),attachmentTemplate.getClass().getCanonicalName());
		InMemoryResource newResource=createChild(resourceId,attachmentTemplate);
		InMemoryAttachment newAttachment = new InMemoryAttachment(aId,this.versionGenerator.nextVersion(attachmentId));
		attachments.put(newAttachment.attachmentId(),newAttachment);
		attachmentsById.put(aId.id(),aId);
		attachmentsByResourceId.put(aId.resourceId(),aId);
		return clazz.cast(newResource);
	}
{@inheritDoc}