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MethodInterceptorFactory.java
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MethodInterceptorFactory.java
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/*
* JBoss, Home of Professional Open Source.
* Copyright 2011, Red Hat, Inc., and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.invocation;
import java.lang.reflect.Method;
import java.util.Map;
/**
* An interceptor factory for interceptor objects which call a specific method via reflection. If this factory is
* called more than once in the same context, it will return the same interceptor instance.
*
* @author <a href="mailto:david.lloyd@redhat.com">David M. Lloyd</a>
*/
public final class MethodInterceptorFactory implements InterceptorFactory {
private final InterceptorInstanceFactory instanceFactory;
private final Method interceptorMethod;
private final boolean changeMethod;
/**
* Construct a new instance.
*
* @param instanceFactory the instance factory for the interceptor instance
* @param interceptorMethod the interceptor method
* @param changeMethod {@code true} to change the method on the context to equal the given method, {@code false} to leave it as-is
*/
public MethodInterceptorFactory(final InterceptorInstanceFactory instanceFactory, final Method interceptorMethod, final boolean changeMethod) {
this.instanceFactory = instanceFactory;
this.interceptorMethod = interceptorMethod;
this.changeMethod = changeMethod;
}
/**
* Construct a new instance.
*
* @param instanceFactory the instance factory for the interceptor instance
* @param interceptorMethod the interceptor method
*/
public MethodInterceptorFactory(final InterceptorInstanceFactory instanceFactory, final Method interceptorMethod) {
this(instanceFactory, interceptorMethod, false);
}
/** {@inheritDoc} */
public Interceptor create(final InterceptorFactoryContext context) {
final Map<Object,Object> map = context.getContextData();
if (map.containsKey(this)) {
return (Interceptor) map.get(this);
} else {
final MethodInterceptor interceptor = new MethodInterceptor(instanceFactory.createInstance(context), interceptorMethod, changeMethod);
map.put(this, interceptor);
return interceptor;
}
}
}