/**
* Copyright 2012-2014 Gunnar Morling (http://www.gunnarmorling.de/)
* and/or other contributors as indicated by the @authors tag. See the
* copyright.txt file in the distribution for a full listing of all
* contributors.
*
* 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 org.mapstruct.ap.model.source.selector;
import java.util.ArrayList;
import java.util.List;
import javax.lang.model.type.TypeMirror;
import org.mapstruct.ap.model.common.Parameter;
import org.mapstruct.ap.model.common.Type;
import org.mapstruct.ap.model.source.Method;
/**
* Selects on inheritance distance, e.g. the amount of inheritance steps from the parameter type.
*
* @author Sjaak Derksen
*/
public class InheritanceSelector implements MethodSelector {
@Override
public <T extends Method> List<T> getMatchingMethods(
Method mappingMethod,
List<T> methods,
Type parameterType,
Type returnType,
List<TypeMirror> qualifiers,
String targetPropertyName
) {
List<T> candidatesWithBestMatchingSourceType = new ArrayList<T>();
int bestMatchingSourceTypeDistance = Integer.MAX_VALUE;
// find the methods with the minimum distance regarding getParameter getParameter type
for ( T method : methods ) {
Parameter singleSourceParam = method.getSourceParameters().iterator().next();
int sourceTypeDistance = parameterType.distanceTo( singleSourceParam.getType() );
bestMatchingSourceTypeDistance =
addToCandidateListIfMinimal(
candidatesWithBestMatchingSourceType,
bestMatchingSourceTypeDistance,
method,
sourceTypeDistance
);
}
return candidatesWithBestMatchingSourceType;
}
private <T extends Method> int addToCandidateListIfMinimal(List<T> candidatesWithBestMathingType,
int bestMatchingTypeDistance, T method,
int currentTypeDistance) {
if ( currentTypeDistance == bestMatchingTypeDistance ) {
candidatesWithBestMathingType.add( method );
}
else if ( currentTypeDistance < bestMatchingTypeDistance ) {
bestMatchingTypeDistance = currentTypeDistance;
candidatesWithBestMathingType.clear();
candidatesWithBestMathingType.add( method );
}
return bestMatchingTypeDistance;
}
}