/**
 * 
 * Copyright 2014 The Darks ORM Project (Liu lihua)
 *
 * 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 darks.orm.core.aspect.jython;

import darks.orm.app.SqlSession;
import darks.orm.app.QueryEnumType;
import darks.orm.core.aspect.QueryAspectAdapter;
import darks.orm.core.data.xml.AspectData;
import darks.orm.core.data.xml.QueryAspectWrapper;
import darks.orm.exceptions.AspectException;
import darks.orm.util.PluginHelper;

public class PythonQueryAspect extends QueryAspectAdapter
{
    
    private PythonParser pythonParser = null;
    
    public PythonQueryAspect()
    {
        
    }
    
    @Override
    public boolean beforeInvoke(SqlSession dao, AspectData aspectData, QueryAspectWrapper queryWrapper,
        QueryEnumType queryEnumType)
        throws AspectException
    {
        if (aspectData == null)
            return true;
        if (PluginHelper.isRegJythonPlugin())
        {
            PythonParser parser = getPythonParser();
            return parser.parse(aspectData, queryWrapper, queryEnumType, PythonBuilder.JY_ASPECT_BEFORE);
        }
        return true;
    }
    
    @Override
    public boolean afterInvoke(SqlSession dao, AspectData aspectData, QueryAspectWrapper queryWrapper,
        QueryEnumType queryEnumType)
        throws AspectException
    {
        if (aspectData == null)
            return true;
        if (PluginHelper.isRegJythonPlugin())
        {
            PythonParser parser = getPythonParser();
            return parser.parse(aspectData, queryWrapper, queryEnumType, PythonBuilder.JY_ASPECT_AFTER);
        }
        return true;
    }
    
    private PythonParser getPythonParser()
    {
        if (pythonParser == null)
        {
            if (PluginHelper.isRegJythonPlugin())
            {
                pythonParser = new PythonParser();
            }
            else
            {
                return null;
            }
        }
        return pythonParser;
    }
    
}