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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code 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
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package javax.activation;
/**
* The CommandInfo class is used by CommandMap implementations to
* describe the results of command requests. It provides the requestor
* with both the verb requested, as well as an instance of the
* bean. There is also a method that will return the name of the
* class that implements the command but <i>it is not guaranteed to
* return a valid value</i>. The reason for this is to allow CommandMap
* implmentations that subclass CommandInfo to provide special
* behavior. For example a CommandMap could dynamically generate
* JavaBeans. In this case, it might not be possible to create an
* object with all the correct state information solely from the class
* name.
*
* @since 1.6
*/
public class CommandInfo {
/**
* The Constructor for CommandInfo.
* @param verb The command verb this CommandInfo decribes.
* @param className The command's fully qualified class name.
*/
}
/**
* Return the command verb.
*
* @return the command verb.
*/
return verb;
}
/**
* Return the command's class name. <i>This method MAY return null in
* cases where a CommandMap subclassed CommandInfo for its
* own purposes.</i> In other words, it might not be possible to
* create the correct state in the command by merely knowing
* its class name. <b>DO NOT DEPEND ON THIS METHOD RETURNING
* A VALID VALUE!</b>
*
* @return The class name of the command, or <i>null</i>
*/
return className;
}
/**
* Return the instantiated JavaBean component.
* <p>
* Begin by instantiating the component with
* <code>Beans.instantiate()</code>.
* <p>
* If the bean implements the <code>javax.activation.CommandObject</code>
* interface, call its <code>setCommandContext</code> method.
* <p>
* If the DataHandler parameter is null, then the bean is
* instantiated with no data. NOTE: this may be useful
* if for some reason the DataHandler that is passed in
* throws IOExceptions when this method attempts to
* access its InputStream. It will allow the caller to
* retrieve a reference to the bean if it can be
* instantiated.
* <p>
* If the bean does NOT implement the CommandObject interface,
* this method will check if it implements the
* java.io.Externalizable interface. If it does, the bean's
* readExternal method will be called if an InputStream
* can be acquired from the DataHandler.<p>
*
* @param dh The DataHandler that describes the data to be
* passed to the command.
* @param loader The ClassLoader to be used to instantiate the bean.
* @return The bean
* @see java.beans.Beans#instantiate
* @see javax.activation.CommandObject
*/
throws IOException, ClassNotFoundException {
// try to instantiate the bean
// if we got one and it is a CommandObject
if (new_bean instanceof CommandObject) {
} else if (new_bean instanceof Externalizable) {
new ObjectInputStream(is));
}
}
}
}
return new_bean;
}
}