/**
 * Alipay.com Inc.
 * Copyright (c) 2004-2012 All Rights Reserved.
 */
package com.alipay.zdal.parser.sql.ast.expr;

import java.util.ArrayList;
import java.util.List;

import com.alipay.zdal.parser.sql.ast.SQLExpr;
import com.alipay.zdal.parser.sql.ast.SQLExprImpl;
import com.alipay.zdal.parser.sql.visitor.SQLASTVisitor;

/**
 * 
 * @author xiaoqing.zhouxq
 * @version $Id: SQLListExpr.java, v 0.1 2012-11-17 ����3:18:02 xiaoqing.zhouxq Exp $
 */
public class SQLListExpr extends SQLExprImpl {

    private static final long   serialVersionUID = 1L;

    private final List<SQLExpr> items            = new ArrayList<SQLExpr>();

    public List<SQLExpr> getItems() {
        return items;
    }

    @Override
    protected void accept0(SQLASTVisitor visitor) {
        if (visitor.visit(this)) {
            acceptChild(visitor, items);
        }
        visitor.endVisit(this);
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + ((items == null) ? 0 : items.hashCode());
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (obj == null) {
            return false;
        }
        if (getClass() != obj.getClass()) {
            return false;
        }
        SQLListExpr other = (SQLListExpr) obj;
        if (items == null) {
            if (other.items != null) {
                return false;
            }
        } else if (!items.equals(other.items)) {
            return false;
        }
        return true;
    }

}