ExecutorFactory.java

/*
 * Copyright 2014-2015 the original author or authors
 *
 * 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.wplatform.ddal.excutor;

import com.wplatform.ddal.command.CommandInterface;
import com.wplatform.ddal.command.Prepared;
import com.wplatform.ddal.command.ddl.AlterTableAddConstraint;
import com.wplatform.ddal.command.ddl.AlterTableAlterColumn;
import com.wplatform.ddal.command.ddl.CreateTable;
import com.wplatform.ddal.command.ddl.DropTable;
import com.wplatform.ddal.command.ddl.TruncateTable;
import com.wplatform.ddal.command.dml.Call;
import com.wplatform.ddal.command.dml.Select;
import com.wplatform.ddal.command.dml.SelectUnion;
import com.wplatform.ddal.command.dml.Set;
import com.wplatform.ddal.command.dml.TransactionCommand;
import com.wplatform.ddal.excutor.ddl.AlterTableAddConstraintExecutor;
import com.wplatform.ddal.excutor.ddl.AlterTableAlterColumnExecutor;
import com.wplatform.ddal.excutor.ddl.CreateTableExecutor;
import com.wplatform.ddal.excutor.ddl.DropTableExecutor;
import com.wplatform.ddal.excutor.ddl.TruncateTableExecutor;
import com.wplatform.ddal.excutor.dml.CallExecutor;
import com.wplatform.ddal.excutor.dml.SelectExecutor;
import com.wplatform.ddal.excutor.dml.SelectUnionExecutor;
import com.wplatform.ddal.excutor.dml.SetExecutor;
import com.wplatform.ddal.excutor.dml.TransactionExecutor;
import com.wplatform.ddal.message.DbException;

/**
 * @author <a href="mailto:jorgie.mail@gmail.com">jorgie li</a>
 *
 */
public class ExecutorFactory implements PreparedExecutorFactory {

    @Override
    public PreparedExecutor newExecutor(Prepared prepared) {
        return create(prepared);
    }

    private PreparedExecutor create(Prepared prepared) {
        int type = prepared.getType();
        switch (type) {
        //dml
        case CommandInterface.CREATE_TABLE:
            return new CreateTableExecutor((CreateTable) prepared);
        case CommandInterface.DROP_TABLE:
            return new DropTableExecutor((DropTable) prepared);
        case CommandInterface.ALTER_TABLE_ALTER_COLUMN_NOT_NULL:
        case CommandInterface.ALTER_TABLE_ALTER_COLUMN_NULL:
        case CommandInterface.ALTER_TABLE_ALTER_COLUMN_DEFAULT:
        case CommandInterface.ALTER_TABLE_ALTER_COLUMN_CHANGE_TYPE:
        case CommandInterface.ALTER_TABLE_ADD_COLUMN:
        case CommandInterface.ALTER_TABLE_DROP_COLUMN:
        case CommandInterface.ALTER_TABLE_ALTER_COLUMN_SELECTIVITY:
            return new AlterTableAlterColumnExecutor((AlterTableAlterColumn) prepared);
        case CommandInterface.ALTER_TABLE_ADD_CONSTRAINT_REFERENTIAL:
        case CommandInterface.ALTER_TABLE_ADD_CONSTRAINT_PRIMARY_KEY:
        case CommandInterface.ALTER_TABLE_ADD_CONSTRAINT_UNIQUE:
        case CommandInterface.ALTER_TABLE_ADD_CONSTRAINT_CHECK:
            return new AlterTableAddConstraintExecutor((AlterTableAddConstraint) prepared);
        case CommandInterface.TRUNCATE_TABLE:
            return new TruncateTableExecutor((TruncateTable) prepared);
        //ddl    
        case CommandInterface.INSERT:
            return new CreateTableExecutor((CreateTable) prepared);
        case CommandInterface.DELETE:
            return new DropTableExecutor((DropTable) prepared);
        case CommandInterface.UPDATE:
            return new CreateTableExecutor((CreateTable) prepared);
        case CommandInterface.REPLACE:
            return new DropTableExecutor((DropTable) prepared);
        case CommandInterface.MERGE:
            return new CreateTableExecutor((CreateTable) prepared);
        case CommandInterface.SELECT: {
            if(prepared instanceof SelectUnion) {
                return new SelectUnionExecutor((SelectUnion) prepared);
            } else {
                return new SelectExecutor((Select) prepared);
            }
        }
        case CommandInterface.CALL:
            return new CallExecutor((Call) prepared);
        case CommandInterface.SET:
            return new SetExecutor((Set) prepared);
        case CommandInterface.SET_AUTOCOMMIT_TRUE:
        case CommandInterface.SET_AUTOCOMMIT_FALSE:
        case CommandInterface.BEGIN:
        case CommandInterface.COMMIT:
        case CommandInterface.ROLLBACK:
        case CommandInterface.CHECKPOINT:
        case CommandInterface.SAVEPOINT:
        case CommandInterface.ROLLBACK_TO_SAVEPOINT:
        case CommandInterface.COMMIT_TRANSACTION:
        case CommandInterface.ROLLBACK_TRANSACTION:
        case CommandInterface.TRANSACTION_ISOLATION:
        case CommandInterface.TRANSACTION_READONLY_FALSE:
        case CommandInterface.TRANSACTION_READONLY_TRUE:
            return new TransactionExecutor((TransactionCommand) prepared);
        default:
            throw DbException.getUnsupportedException("statemets type=" + type);
        }
    }

}