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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 das;
import java.io.InputStream;
import java.util.Vector;
import org.apache.tuscany.das.rdb.Command;
import org.apache.tuscany.das.rdb.DAS;
import org.osoa.sca.annotations.Scope;
import commonj.sdo.DataObject;
@Scope("COMPOSITE")
public class DASServiceImpl implements DASService {
private DAS das = null;
/**
* Initialize DAS
* @return
* @throws DASServiceException
*/
private void initDAS(InputStream config) throws DASServiceException {
if(config == null){
throw new DASServiceException("Missing configuration information");
}
if(this.das != null){
this.das.releaseResources();
this.das = null;
}
this.das = DAS.FACTORY.createDAS(config);
}
/**
* Get a DAS instance based on the configuration
* @return
* @throws DASServiceException
*/
private DAS getDAS() throws DASServiceException {
if(this.das == null){
throw new DASServiceException("DAS not initialized. Please provide DAS configuration torugh das.SetConfig");
}
return this.das;
}
/**
* Set DAS configuration file to be used
* @param configStream
* @throws DASServiceException
*/
public void configureService(InputStream configStream) throws DASServiceException{
this.initDAS(configStream);
}
/**
* Execute an existing command. The commands are defined in the DAS Configuration file being used by the service
* @param commandName Command name as it appears on the DAS Configuration file
* @param commandArguments Vector with arguments to be used by the command
* @throws DASServiceException
* @return
*/
public DataObject executeCommand(String commandName, Vector commandArguments) throws DASServiceException{
Command command = this.getDAS().getCommand(commandName);
if(command == null){
throw new DASServiceException("Invalid command: " + commandName);
}
//check if arguments was passed
if(commandArguments != null && commandArguments.size() > 0){
//we need to set the arguments
int pos=0;
for(Object argument : commandArguments){
pos++;
command.setParameter(pos, argument);
}
}
DataObject root = command.executeQuery();
return root;
}
/**
* Execute a new command, this can be any arbitrary valid query based on the backend implementation (e.g. SQL Query for DAS RDB)
* @param newCommand A new command to be executed (e.g SQL Query)
* @param commandArguments Vector with arguments to be used by the command
* @throws DASServiceException
* @return
*/
public DataObject execute(String adHocQuery, Vector commandArguments) throws DASServiceException {
Command command = this.getDAS().createCommand(adHocQuery);
if(command == null){
throw new DASServiceException("Invalid command: " + adHocQuery);
}
//check if arguments was passed
if(commandArguments != null && commandArguments.size() > 0){
//we need to set the arguments
int pos=0;
for(Object argument : commandArguments){
pos++;
command.setParameter(pos, argument);
}
}
DataObject root = command.executeQuery();
return root;
}
/**
* Apply all changes on the graph back to the persistent repository.
* This would save the changes on the SDO ChangeSummary back to the database
* Note: Your SDO ojects should have been created with ChangeSummary support
* @throws DASServiceException
* @param graphRoot SDO Object with changes to be commited to persistent repository
*/
public void applyChanges(DataObject graphRoot) throws DASServiceException{
// TODO Auto-generated method stub
}
}
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