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/*
* Copyright 2002-2012 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 org.springframework.aop.aspectj;
import org.springframework.aop.framework.AopConfigException;
import org.springframework.core.Ordered;
import org.springframework.util.Assert;
/**
* Implementation of {@link AspectInstanceFactory} that creates a new instance
* of the specified aspect class for every {@link #getAspectInstance()} call.
*
* @author Juergen Hoeller
* @since 2.0.4
*/
public class SimpleAspectInstanceFactory implements AspectInstanceFactory {
private final Class<?> aspectClass;
/**
* Create a new SimpleAspectInstanceFactory for the given aspect class.
* @param aspectClass the aspect class
*/
public SimpleAspectInstanceFactory(Class<?> aspectClass) {
Assert.notNull(aspectClass, "Aspect class must not be null");
this.aspectClass = aspectClass;
}
/**
* Return the specified aspect class (never {@code null}).
*/
public final Class<?> getAspectClass() {
return this.aspectClass;
}
@Override
public final Object getAspectInstance() {
try {
return this.aspectClass.newInstance();
}
catch (InstantiationException ex) {
throw new AopConfigException("Unable to instantiate aspect class [" + this.aspectClass.getName() + "]", ex);
}
catch (IllegalAccessException ex) {
throw new AopConfigException("Cannot access element class [" + this.aspectClass.getName() + "]", ex);
}
}
@Override
public ClassLoader getAspectClassLoader() {
return this.aspectClass.getClassLoader();
}
/**
* Determine the order for this factory's aspect instance,
* either an instance-specific order expressed through implementing
* the {@link org.springframework.core.Ordered} interface,
* or a fallback order.
* @see org.springframework.core.Ordered
* @see #getOrderForAspectClass
*/
@Override
public int getOrder() {
return getOrderForAspectClass(this.aspectClass);
}
/**
* Determine a fallback order for the case that the aspect instance
* does not express an instance-specific order through implementing
* the {@link org.springframework.core.Ordered} interface.
* <p>The default implementation simply returns {@code Ordered.LOWEST_PRECEDENCE}.
* @param aspectClass the aspect class
*/
protected int getOrderForAspectClass(Class<?> aspectClass) {
return Ordered.LOWEST_PRECEDENCE;
}
}
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