/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.wicket.examples.spring.common;

import java.util.Iterator;

/**
 * interface for retrieving contacts from a database
 * 
 * @author Igor Vaynberg (ivaynberg)
 * 
 */
public interface ContactDao
{
	/**
	 * @return total number of contacts available
	 */
	int count();

	/**
	 * @param qp
	 *            sorting and paging info
	 * @return iterator over contacts
	 */
	Iterator<Contact> find(QueryParam qp);

	/**
	 * @param id
	 *            contact id
	 * @return contact with matching id
	 */
	Contact get(long id);
}
