SetPlayer.java example

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/*
 * #!
 * Ontopia Webed
 * #-
 * Copyright (C) 2001 - 2013 The Ontopia Project
 * #-
 * 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 net.ontopia.topicmaps.webed.impl.actions.assocrole;

import net.ontopia.topicmaps.core.AssociationRoleIF;
import net.ontopia.topicmaps.core.TopicIF;
import net.ontopia.topicmaps.webed.core.ActionIF;
import net.ontopia.topicmaps.webed.core.ActionParametersIF;
import net.ontopia.topicmaps.webed.core.ActionResponseIF;
import net.ontopia.topicmaps.webed.core.ActionRuntimeException;
import net.ontopia.topicmaps.webed.impl.utils.ActionSignature;

/**
 * PUBLIC: Action for adding role player to an association role.
 */
public class SetPlayer implements ActionIF {
  
  public void perform(ActionParametersIF params, ActionResponseIF response) {
     //test params
    ActionSignature paramsType = ActionSignature.getSignature("r t?");
    paramsType.validateArguments(params, this);

    AssociationRoleIF role = (AssociationRoleIF) params.get(0);
    if (role == null)
      throw new ActionRuntimeException("No role given to SetPlayer action");
    
    TopicIF player = (TopicIF) params.get(1);
    if (player == null) {
      player = (TopicIF) params.getTMObjectValue();
      if (player == null)
        throw new ActionRuntimeException("No player to be set given to SetPlayer action");
    }

    role.setPlayer(player);
  }
  
}