software.amazon.smithy.model.transform.MapTraits Maven / Gradle / Ivy
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/*
* Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License").
* You may not use this file except in compliance with the License.
* A copy of the License is located at
*
* http://aws.amazon.com/apache2.0
*
* or in the "license" file accompanying this file. This file 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 software.amazon.smithy.model.transform;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Objects;
import java.util.function.BiFunction;
import software.amazon.smithy.model.Model;
import software.amazon.smithy.model.shapes.Shape;
import software.amazon.smithy.model.traits.Trait;
/**
* Maps over traits in a model using a mapping function.
*
* Shapes are only transformed and replaced in the model if one
* of its traits are modified.
*
* @see ModelTransformer#mapTraits
*/
final class MapTraits {
private final BiFunction mapper;
MapTraits(BiFunction mapper) {
this.mapper = mapper;
}
Model transform(ModelTransformer transformer, Model model) {
return transformer.mapShapes(model, this::mapTraits);
}
private Shape mapTraits(Shape shape) {
Collection traits = new ArrayList<>();
boolean changed = false;
// Map over the traits and see if any of them changed. If none
// changed, then there is no need to create a new copy of the shape.
for (Trait trait : shape.getAllTraits().values()) {
Trait mapped = Objects.requireNonNull(mapper.apply(shape, trait), "Trait mapper must not return null");
traits.add(mapped);
if (!mapped.equals(trait)) {
changed = true;
}
}
if (!changed) {
return shape;
}
return Shape.shapeToBuilder(shape).clearTraits().addTraits(traits).build();
}
}