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package ars.database.repository;

import java.util.Map;
import java.util.List;
import java.util.Iterator;
import java.util.Collections;

import ars.util.Conditions.Logic;
import ars.database.repository.Query;

/**
 * 数据查询集合空实现
 * 
 * @author yongqiangwu
 * 
 * @param 
 *            数据模型
 */
public final class EmptyQuery implements Query {
	private static EmptyQuery instance;

	private EmptyQuery() {

	}

	/**
	 * 获取数据查询集合实例
	 * 
	 * @param 
	 *            数据类型
	 * @return 数据查询集合实例
	 */
	@SuppressWarnings("unchecked")
	public static  EmptyQuery instance() {
		if (instance == null) {
			synchronized (EmptyQuery.class) {
				if (instance == null) {
					instance = new EmptyQuery();
				}
			}
		}
		return (EmptyQuery) instance;
	}

	@Override
	public Class getModel() {
		return null;
	}

	@Override
	public Iterator iterator() {
		return this.list().iterator();
	}

	@Override
	public Query empty(String... properties) {
		return this;
	}

	@Override
	public Query nonempty(String... properties) {
		return this;
	}

	@Override
	public Query eq(String property, Object value) {
		return this;
	}

	@Override
	public Query ne(String property, Object value) {
		return this;
	}

	@Override
	public Query gt(String property, Object value) {
		return this;
	}

	@Override
	public Query ge(String property, Object value) {
		return this;
	}

	@Override
	public Query lt(String property, Object value) {
		return this;
	}

	@Override
	public Query le(String property, Object value) {
		return this;
	}

	@Override
	public Query between(String property, Object low, Object high) {
		return this;
	}

	@Override
	public Query start(String property, String... values) {
		return this;
	}

	@Override
	public Query nstart(String property, String... values) {
		return this;
	}

	@Override
	public Query end(String property, String... values) {
		return this;
	}

	@Override
	public Query nend(String property, String... values) {
		return this;
	}

	@Override
	public Query like(String property, String... values) {
		return this;
	}

	@Override
	public Query nlike(String property, String... values) {
		return this;
	}

	@Override
	public Query in(String property, Object[] values) {
		return this;
	}

	@Override
	public Query or(String property, Object[] values) {
		return this;
	}

	@Override
	public Query not(String property, Object[] values) {
		return this;
	}

	@Override
	public Query custom(String property, Object value) {
		return this;
	}

	@Override
	public Query custom(Map parameters) {
		return this;
	}

	@Override
	public Query condition(Logic logic) {
		return this;
	}

	@Override
	public Query condition(String property, Object value) {
		return this;
	}

	@Override
	public Query condition(Map parameters) {
		return this;
	}

	@Override
	public Query eqProperty(String property, String other) {
		return this;
	}

	@Override
	public Query neProperty(String property, String other) {
		return this;
	}

	@Override
	public Query ltProperty(String property, String other) {
		return this;
	}

	@Override
	public Query leProperty(String property, String other) {
		return this;
	}

	@Override
	public Query gtProperty(String property, String other) {
		return this;
	}

	@Override
	public Query geProperty(String property, String other) {
		return this;
	}

	@Override
	public Query asc(String... properties) {
		return this;
	}

	@Override
	public Query desc(String... properties) {
		return this;
	}

	@Override
	public Query paging(int page, int size) {
		return this;
	}

	@Override
	public Query min(String... properties) {
		return this;
	}

	@Override
	public Query max(String... properties) {
		return this;
	}

	@Override
	public Query avg(String... properties) {
		return this;
	}

	@Override
	public Query sum(String... properties) {
		return this;
	}

	@Override
	public Query number(String... properties) {
		return this;
	}

	@Override
	public Query group(String... properties) {
		return this;
	}

	@Override
	public Query property(String... properties) {
		return this;
	}

	@Override
	public int count() {
		return 0;
	}

	@Override
	public T single() {
		return null;
	}

	@Override
	public List list() {
		return Collections.emptyList();
	}

	@Override
	public List stats() {
		return Collections.emptyList();
	}

}