SQLDeleteStatement.java

/*
 * 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.SQLName;
import com.alibaba.druid.sql.ast.SQLStatementImpl;
import com.alibaba.druid.sql.ast.expr.SQLIdentifierExpr;
import com.alibaba.druid.sql.visitor.SQLASTVisitor;

public class SQLDeleteStatement extends SQLStatementImpl {

    protected SQLTableSource tableSource;
    protected SQLExpr        where;
    protected SQLTableSource from;

    public SQLDeleteStatement(){

    }
    
    public SQLDeleteStatement(String dbType){
        super (dbType);
    }

    public SQLTableSource getTableSource() {
        return tableSource;
    }

    public SQLExprTableSource getExprTableSource() {
        return (SQLExprTableSource) getTableSource();
    }

    public void setTableSource(SQLExpr expr) {
        this.setTableSource(new SQLExprTableSource(expr));
    }

    public void setTableSource(SQLTableSource tableSource) {
        if (tableSource != null) {
            tableSource.setParent(this);
        }
        this.tableSource = tableSource;
    }

    public SQLName getTableName() {
        if (this.tableSource instanceof SQLExprTableSource) {
            SQLExprTableSource exprTableSource = (SQLExprTableSource) this.tableSource;
            return (SQLName) exprTableSource.getExpr();
        }

        if (tableSource instanceof SQLSubqueryTableSource) {
            SQLSelectQuery selectQuery = ((SQLSubqueryTableSource) tableSource).getSelect().getQuery();
            if (selectQuery instanceof SQLSelectQueryBlock) {
                SQLTableSource subQueryTableSource = ((SQLSelectQueryBlock) selectQuery).getFrom();
                if (subQueryTableSource instanceof SQLExprTableSource) {
                    SQLExpr subQueryTableSourceExpr = ((SQLExprTableSource) subQueryTableSource).getExpr();
                    return (SQLName) subQueryTableSourceExpr;
                }
            }
        }

        return null;
    }

    public void setTableName(SQLName tableName) {
        this.setTableSource(new SQLExprTableSource(tableName));
    }

    public void setTableName(String name) {
        setTableName(new SQLIdentifierExpr(name));
    }

    public SQLExpr getWhere() {
        return where;
    }

    public void setWhere(SQLExpr where) {
        if (where != null) {
            where.setParent(this);
        }
        this.where = where;
    }

    public String getAlias() {
        return this.tableSource.getAlias();
    }

    public void setAlias(String alias) {
        this.tableSource.setAlias(alias);
    }

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

        visitor.endVisit(this);
    }

    public SQLTableSource getFrom() {
        return from;
    }

    public void setFrom(SQLTableSource from) {
        if (from != null) {
            from.setParent(this);
        }
        this.from = from;
    }
}