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disl = data integration specific language. Goal of this project is to implement groovy based domain specific language supporting modelling of data integration projects. Disl will support data modeling and data mapping including support for MDA transformations and unit testing.

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/*
 * Copyright 2015 - 2016 Karel H�bl .
 *
 * This file is part of disl.
 *
 * Disl is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Disl is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Disl.  If not, see .
 */
package org.disl.meta

import groovy.io.FileType
import groovy.transform.CompileStatic

import java.lang.reflect.Constructor
import java.lang.reflect.Modifier
import java.util.regex.Pattern

import org.disl.workflow.ClassFinder
/**
 * Factory for DISL model objects.
 * */
@CompileStatic
class MetaFactory {
	static  T create(Class type, Closure initClosure=null) {
		try {
			createInstance(type,initClosure)
		} catch (Throwable e) {
			throw new RuntimeException("Unable to create instance of class ${type.getName()}",e);
		}
	}

	private static  T createInstance(Class type, Closure initClosure) {
		T instance=newInstance(type)
		initInstance(instance,initClosure)
		return instance
	}
	
	public static  T newInstance(Class type) {
		if (Modifier.isAbstract(type.getModifiers())) {
			throw new RuntimeException("Unable to instantiate abstract type $type.name.")
		}
		Constructor constructor=type.getDeclaredConstructor(new Class[0])
		constructor.setAccessible(true)
		return constructor.newInstance(new Object[0])
	}

	private static void initInstance(Object instance,Closure initClosure=null) {
		if (initClosure) {
			initClosure.call(instance)
		}
		if (instance instanceof Initializable) {
			instance.init();
		}
	}
	
	

	/**
	 * Creates instances for all found classes in given rootPackage (including subpackages) which are assignable to assignableType. 
	 * Only classes located in the same class path element (jar file or directory) as the sourceClass will be found and created!
	 * 
	 * Example: 
	 * //Generate all tables defined in disl model for your data warehouse.
	 * MetaFactory.createAll(com.yourDw.AbstractDwTable,"com.yourDw",AbstractDwTable).each({it.generate})
	 * */
	static  List createAll(String rootPackage,Class assignableType) {
		List> typesToCreate=findTypes(rootPackage, assignableType)
		if (typesToCreate.size()==0) {
			throw new RuntimeException('No classes found!')
		}
		typesToCreate.collect {create(it)}
	}
	
	/**
	 * Returns classes in given rootPackage (including subpackages) which are assignable to assignableType.
	 * */
	static  List> findTypes(String rootPackage,Class assignableType) {
		ClassFinder.createClassFinder(rootPackage).findNonAbstractTypes(rootPackage,assignableType)
	}
	

}