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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.Condition;

/**
 * 数据查询集合空实现
 *
 * @param  数据模型
 * @author wuyongqiang
 */
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(Condition condition) {
        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();
    }

}