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package org.nlpcn.es4sql.domain;

import java.util.LinkedList;

public class Where implements Cloneable{

	public enum CONN {
		AND, OR;

		public CONN negative() {
			return this == AND ? OR : AND;
		}
	}

	public static Where newInstance() {
		return new Where(CONN.AND);
	}

	//zhongshu-comment 只有wheres和conn这两个属性
	private LinkedList wheres = new LinkedList<>();//zhongshu-comment 不会被子类Condition继承，但是子类可以通过get() set()方法访问吧？
	protected CONN conn;

	public Where(String connStr) {
		this.conn = CONN.valueOf(connStr.toUpperCase());
	}

	public Where(CONN conn) {
		this.conn = conn;
	}

	public void addWhere(Where where) {
		wheres.add(where);
	}

	public CONN getConn() {
		return this.conn;
	}

	public void setConn(CONN conn) {
		this.conn = conn;
	}
	
	public LinkedList getWheres() {
		return wheres;
	}

	@Override
	public String toString(){
		if(wheres.size()>0){
			String whereStr = wheres.toString() ;
			return this.conn + " ( "+whereStr.substring(1,whereStr.length()-1)+" ) " ;
		}else{
			return "" ;
		}
		
	}

    @Override
    public Object clone() throws CloneNotSupportedException {
        Where clonedWhere = new Where(this.getConn());
        for (Where innerWhere : this.getWheres()){
            clonedWhere.addWhere((Where)innerWhere.clone());
        }
        return clonedWhere;
    }
}