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/*
* Copyright (C) 2005 John D. Heintz
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public License
* as published by the Free Software Foundation; either version 2.1
* of the License.
*
* This program 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 Library General Public License for more details.
*
* John D. Heintz can be reached at: jheintz@pobox.com
*/
package dash.obtain;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
/**
* The @Obtain annotation provides a marker for fields that will be "obtain"-ed at
* runtime based on lookups to the ProviderService service. See the ObtainLookup class
* for documentation of the details about the annotated field that is provided to the
* Provider service.
*
* <p>An AspectJ Aspect is used to control the interception of field accesses and
* provide the binding behavior into the ProviderService service. The AspectJ pointcut
* used is:
* <pre>pointcut obtain_get(): get(@Obtain * *);</pre>
*
* <p>If the ProviderService service fails to correctly Obtain a target object
* a NullPointerException will be thrown into the code accessing the field.
*
* <p>A single field will be obtained once per instance.
*
* @see dash.obtain.provider.ProviderService
* @see dash.obtain.provider.ObtainLookup
* @throws java.lang.NullPointerException
* @author jheintz
*
*/
@Retention(RetentionPolicy.RUNTIME)
public @interface Obtain {
public String value() default "";
}
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