software.amazon.smithy.model.transform.MapShapes 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.Objects;
import java.util.function.Function;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import software.amazon.smithy.model.Model;
import software.amazon.smithy.model.shapes.Shape;
/**
* Maps over shapes in the model using a mapping function.
*
* Only shapes that have changed cause the shape the be replaced in
* the Model. The mapping function MUST return a shape with the same
* ID and the same type (e.g., a string cannot become an integer).
*
* @see ModelTransformer#mapShapes
*/
final class MapShapes {
private final Function mapper;
MapShapes(Function mapper) {
this.mapper = mapper;
}
Model transform(ModelTransformer transformer, Model model) {
return transformer.replaceShapes(model, model.shapes()
.flatMap(shape -> {
Shape mapped = Objects.requireNonNull(mapper.apply(shape), "Shape mapper must not return null");
if (mapped.equals(shape)) {
return Stream.empty();
} else if (!mapped.getId().equals(shape.getId())) {
throw new ModelTransformException(String.format(
"Mapped shapes must have the same shape ID. Expected %s, but found %s",
shape.getId(), mapped.getId()));
} else {
return Stream.of(mapped);
}
})
.collect(Collectors.toSet()));
}
}