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/*
* Copyright (c) OSGi Alliance (2002, 2010). All Rights Reserved.
*
* 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.osgi.service.upnp;
import java.util.Dictionary;
/**
* A UPnP action.
*
* Each UPnP service contains zero or more actions. Each action may have zero or
* more UPnP state variables as arguments.
*
* @version $Id: 2db11f45a7dd2f34775d673355095ad3037821db $
*/
public interface UPnPAction {
/**
* Returns the action name.
*
* The action name corresponds to the {@code name} field in the
* {@code actionList} of the service description.
*
* - For standard actions defined by a UPnP Forum working committee,
* action names must not begin with {@code X_ } nor {@code A_}.
* - For non-standard actions specified by a UPnP vendor and added to a
* standard service, action names must begin with {@code X_}.
*
*
*
* This method must continue to return the action name after the UPnP action
* has been removed from the network.
*
* @return Name of action, must not contain a hyphen character or a hash
* character
*/
String getName();
/**
* Returns the name of the designated return argument.
*
* One of the output arguments can be flagged as a designated return
* argument.
*
*
* This method must continue to return the action return argument name after
* the UPnP action has been removed from the network.
*
* @return The name of the designated return argument or {@code null} if
* none is marked.
*/
String getReturnArgumentName();
/**
* Lists all input arguments for this action.
*
* Each action may have zero or more input arguments.
*
*
* This method must continue to return the action input argument names after
* the UPnP action has been removed from the network.
*
* @return Array of input argument names or {@code null} if no input
* arguments.
*
* @see UPnPStateVariable
*/
String[] getInputArgumentNames();
/**
* List all output arguments for this action.
*
*
* This method must continue to return the action output argument names
* after the UPnP action has been removed from the network.
*
* @return Array of output argument names or {@code null} if there are no
* output arguments.
*
* @see UPnPStateVariable
*/
String[] getOutputArgumentNames();
/**
* Finds the state variable associated with an argument name.
*
* Helps to resolve the association of state variables with argument names
* in UPnP actions.
*
* @param argumentName The name of the UPnP action argument.
* @return State variable associated with the named argument or {@code null}
* if there is no such argument.
*
* @throws IllegalStateException if the UPnP action has been removed from
* the network.
*
* @see UPnPStateVariable
*/
UPnPStateVariable getStateVariable(String argumentName);
/**
* Invokes the action.
*
* The input and output arguments are both passed as {@code Dictionary}
* objects. Each entry in the {@code Dictionary} object has a {@code String}
* object as key representing the argument name and the value is the
* argument itself. The class of an argument value must be assignable from
* the class of the associated UPnP state variable.
*
* The input argument {@code Dictionary} object must contain exactly those
* arguments listed by {@code getInputArguments} method. The output argument
* {@code Dictionary} object will contain exactly those arguments listed by
* {@code getOutputArguments} method.
*
* @param args A {@code Dictionary} of arguments. Must contain the correct
* set and type of arguments for this action. May be {@code null} if
* no input arguments exist.
*
* @return A {@code Dictionary} with the output arguments. {@code null} if
* the action has no output arguments.
*
* @throws UPnPException A UPnP error has occurred.
* @throws IllegalStateException if the UPnP action has been removed from
* the network.
* @throws Exception The execution fails for some reason.
*
* @see UPnPStateVariable
*/
Dictionary invoke(Dictionary args) throws Exception;
}