0.8.1-rc1/cli/src/main/java/org/apache/oodt/cas/cli/option/require/RequirementRule.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.oodt.cas.cli.option.require;

//OODT imports
import org.apache.oodt.cas.cli.action.CmdLineAction;

/**
 * A {@link CmdLineOption} requirement rule which specifies if it is required,
 * optional, or not required at all.
 * 
 * @author bfoster (Brian Foster)
 */
public interface RequirementRule {

   public enum Relation {
      REQUIRED, OPTIONAL, NONE
   }

   public Relation getRelation(CmdLineAction action);

}