/*
* Copyright 2003-2016 JetBrains s.r.o.
*
* 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 jetbrains.mps.lang.smodel;
import org.jetbrains.annotations.Nullable;
import org.jetbrains.mps.openapi.language.SAbstractConcept;
/**
* Translation from {@link org.jetbrains.mps.openapi.language.SAbstractConcept SConcept} to integer value.
* @author Artem Tikhomirov
* @since 3.5
*/
public interface ConceptIndex {
/**
* @param c concept to look up
* @return -1 if this index is not aware of the concept, or concept is null
*/
default int index(@Nullable SAbstractConcept c) {
return index(c, -1);
}
/**
* @param c concept to look up
* @param missingValue value indicating index miss
* @return integer index of the concept, or {@code missingValue} if concept is null or not known to the index.
*/
int index(@Nullable SAbstractConcept c, int missingValue);
}