/**************************************************************************************
* Copyright (c) Jonas Bon�r, Alexandre Vasseur. All rights reserved. *
* http://aspectwerkz.codehaus.org *
* ---------------------------------------------------------------------------------- *
* The software in this package is published under the terms of the LGPL license *
* a copy of which has been included with this distribution in the license.txt file. *
**************************************************************************************/
package org.codehaus.aspectwerkz.transform.inlining;
import java.util.StringTokenizer;
import org.codehaus.aspectwerkz.util.ContextClassLoader;
import org.codehaus.aspectwerkz.util.ContextClassLoader;
import org.codehaus.aspectwerkz.transform.inlining.spi.AspectModel;
import org.codehaus.aspectwerkz.definition.AspectDefinition;
import org.codehaus.aspectwerkz.reflect.ClassInfo;
import org.codehaus.aspectwerkz.exception.DefinitionException;
/**
* Manages the different aspect model implementations that is registered.
*
* @author <a href="mailto:jboner@codehaus.org">Jonas Bon�r </a>
*/
public class AspectModelManager {
public static final String ASPECT_MODELS_VM_OPTION = "aspectwerkz.extension.aspectmodels";
private static final String DELIMITER = ":";
/**
* The aspects models that are registered
*/
private static AspectModel[] ASPECT_MODELS = new AspectModel[]{};
static {
registerAspectModels(System.getProperty(ASPECT_MODELS_VM_OPTION, null));
}
/**
* Returns an array with all the aspect models that has been registered.
*
* @return an array with the aspect models
*/
public static AspectModel[] getModels() {
return ASPECT_MODELS;
}
/**
* Returns the advice model for a specific aspect model type id.
*
* @param type the aspect model type id
* @return the aspect model
*/
public static AspectModel getModelFor(String type) {
for (int i = 0; i < ASPECT_MODELS.length; i++) {
AspectModel aspectModel = ASPECT_MODELS[i];
if (aspectModel.getAspectModelType().equals(type)) {
return aspectModel;
}
}
return null;
}
/**
* Let all aspect models try to define the aspect (only one will succeed).
*
* @param aspectClassInfo
* @param aspectDef
* @param loader
*/
public static void defineAspect(final ClassInfo aspectClassInfo,
final AspectDefinition aspectDef,
final ClassLoader loader) {
for (int i = 0; i < ASPECT_MODELS.length; i++) {
ASPECT_MODELS[i].defineAspect(aspectClassInfo, aspectDef, loader);
}
}
/**
* Registers aspect models.
*
* @param aspectModels the class names of the aspect models to register concatenated and separated with a ':'.
*/
private static void registerAspectModels(final String aspectModels) {
if (aspectModels != null) {
StringTokenizer tokenizer = new StringTokenizer(aspectModels, DELIMITER);
ASPECT_MODELS = new AspectModel[tokenizer.countTokens()];
for (int i = 0; i < ASPECT_MODELS.length; i++) {
final String className = tokenizer.nextToken();
try {
final Class modelClass = ContextClassLoader.loadClass(className);
ASPECT_MODELS[i] = (AspectModel) modelClass.newInstance();
} catch (ClassNotFoundException e) {
throw new DefinitionException(
"aspect model implementation class not found [" +
className + "]: " + e.toString()
);
} catch (Exception e) {
throw new DefinitionException(
"aspect model implementation class could not be instantiated [" +
className +
"] - make sure it has a default no argument constructor: " +
e.toString()
);
}
}
}
}
}