/*******************************************************************************
* Mission Control Technologies, Copyright (c) 2009-2012, United States Government
* as represented by the Administrator of the National Aeronautics and Space
* Administration. All rights reserved.
*
* The MCT platform is 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.
*
* MCT includes source code licensed under additional open source licenses. See
* the MCT Open Source Licenses file included with this distribution or the About
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*******************************************************************************/
package gov.nasa.arc.mct.evaluator.view;
import gov.nasa.arc.mct.components.AbstractComponent;
import gov.nasa.arc.mct.evaluator.api.Evaluator;
import gov.nasa.arc.mct.evaluator.enums.EnumEvaluator;
import gov.nasa.arc.mct.evaluator.expressions.ExpressionsViewManifestation;
import gov.nasa.arc.mct.policy.ExecutionResult;
import gov.nasa.arc.mct.policy.Policy;
import gov.nasa.arc.mct.policy.PolicyContext;
import gov.nasa.arc.mct.services.component.ViewInfo;
public class EnumeratorViewPolicy implements Policy {
private static boolean isEnumerator(AbstractComponent component) {
Evaluator ev = component.getCapability(Evaluator.class);
return ev != null && EnumEvaluator.LANGUAGE_STRING.equals(ev.getLanguage());
}
@Override
public ExecutionResult execute(PolicyContext context) {
boolean result = true;
ViewInfo viewInfo = context.getProperty(PolicyContext.PropertyName.TARGET_VIEW_INFO.getName(), ViewInfo.class);
if (viewInfo.getViewClass().equals(ExpressionsViewManifestation.class)) {
AbstractComponent targetComponent = context.getProperty(PolicyContext.PropertyName.TARGET_COMPONENT.getName(), AbstractComponent.class);
result = isEnumerator(targetComponent);
}
String message = null;
if (!result) {
message = "Expression View only valid for enumerators";
}
return new ExecutionResult(context, result, message);
}
}