/*
 * Copyright 1999-2017 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.statement;

import com.alibaba.druid.sql.ast.SQLExpr;
import com.alibaba.druid.sql.ast.SQLReplaceable;
import com.alibaba.druid.sql.ast.SQLStatementImpl;
import com.alibaba.druid.sql.visitor.SQLASTVisitor;

public class SQLExprStatement extends SQLStatementImpl implements SQLReplaceable {
    private SQLExpr expr;

    public SQLExprStatement() {
    }

    public SQLExprStatement(SQLExpr expr) {
        this.setExpr(expr);
    }

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

    public SQLExpr getExpr() {
        return expr;
    }

    public void setExpr(SQLExpr x) {
        if (x != null) {
            x.setParent(this);
        }
        this.expr = x;
    }

    @Override
    public boolean replace(SQLExpr expr, SQLExpr target) {
        if (this.expr == expr) {
            setExpr(target);
            return true;
        }
        return false;
    }

    public SQLExprStatement clone() {
        SQLExprStatement x = new SQLExprStatement();
        cloneTo(x);
        return x;
    }

    protected void cloneTo(SQLExprStatement x) {
        super.cloneTo(x);
        if (x.getExpr() != null) {
            x.setExpr(x.getExpr().clone());
        }
    }
}
