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/*
 * Copyright 1999-2018 Alibaba Group Holding Ltd.
 *
 * Licensed 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 com.alibaba.druid.sql.ast.expr;

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

import com.alibaba.druid.sql.SQLUtils;
import com.alibaba.druid.sql.ast.SQLExpr;
import com.alibaba.druid.sql.ast.SQLExprImpl;
import com.alibaba.druid.sql.visitor.SQLASTVisitor;

public class SQLBinaryOpExprGroup extends SQLExprImpl {
    private final SQLBinaryOperator operator;
    private final List items = new ArrayList();
    private String dbType;

    public SQLBinaryOpExprGroup(SQLBinaryOperator operator) {
        this.operator = operator;
    }

    public SQLBinaryOpExprGroup(SQLBinaryOperator operator, String dbType) {
        this.operator = operator;
        this.dbType = dbType;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        SQLBinaryOpExprGroup that = (SQLBinaryOpExprGroup) o;

        if (operator != that.operator) return false;
        return items.equals(that.items);
    }

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

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

        visitor.endVisit(this);
    }

    @Override
    public SQLExpr clone() {
        SQLBinaryOpExprGroup x = new SQLBinaryOpExprGroup(operator);

        for (SQLExpr item : items) {
            SQLExpr item2 = item.clone();
            item2.setParent(this);
            x.items.add(item2);
        }

        return x;
    }

    @Override
    public List getChildren() {
        return items;
    }

    public void add(SQLExpr item) {
        if (item != null) {
            item.setParent(this);
        }
        this.items.add(item);
    }

    public List getItems() {
        return this.items;
    }

    public SQLBinaryOperator getOperator() {
        return operator;
    }

    public String toString() {
        return SQLUtils.toSQLString(this, dbType);
    }
}