/*******************************************************************************
* 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
* MCT Licenses dialog available at runtime from the MCT Help menu for additional
* information.
*******************************************************************************/
package gov.nasa.arc.mct.core.policy;
import gov.nasa.arc.mct.components.AbstractComponent;
import gov.nasa.arc.mct.policy.ExecutionResult;
import gov.nasa.arc.mct.policy.Policy;
import gov.nasa.arc.mct.policy.PolicyContext;
import java.util.Collection;
/**
* Checks that the same component cannot be linked to itself.
*/
public class SameComponentsCannotBeLinkedPolicy implements Policy {
@SuppressWarnings("unchecked")
@Override
public ExecutionResult execute(PolicyContext context) {
char action = context.getProperty("ACTION", Character.class);
if (action != 'w')
return new ExecutionResult(context, true, "");
AbstractComponent targetComponent = (AbstractComponent) context.getProperty("TARGET");
// Context stores properties untyped, so we're forced to do an unchecked conversion here.
Collection<AbstractComponent> sourceComponents = (Collection<AbstractComponent>) context.getProperty("SOURCES");
if (sourceComponents != null) {
for (AbstractComponent sourceComponent : sourceComponents) {
if(isSameComponent(sourceComponent, targetComponent)) {
return new ExecutionResult(context, false, " Cannot drop " + sourceComponent.getDisplayName() + " onto itself.");
}
}
}
return new ExecutionResult(context, true, "");
}
private boolean isSameComponent(AbstractComponent source, AbstractComponent target) {
// Compares two component Ids
return source.getId().equals(target.getId());
}
}