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A rewrite module automating best practices and migrations for Kubernetes

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/*
 * Copyright 2021 the original author or authors.
 * 
 * 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
 * 

 * https://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.openrewrite.kubernetes;

import org.openrewrite.SourceFile;
import org.openrewrite.TreeVisitor;
import org.openrewrite.kubernetes.tree.KubernetesModel;
import org.openrewrite.yaml.YamlVisitor;
import org.openrewrite.yaml.tree.Yaml;

/**
 * @deprecated Likely better served by {@link org.openrewrite.kubernetes.trait.Traits}.
 */
@Deprecated
public class KubernetesVisitor
 extends YamlVisitor {

    @Override
    public boolean isAcceptable(SourceFile sourceFile, P p) {
        if (!(sourceFile instanceof Yaml.Documents)) {
            return false;
        }
        Yaml.Documents docs = (Yaml.Documents) sourceFile;
        for (Yaml.Document doc : docs.getDocuments()) {
            if (doc.getMarkers().findFirst(KubernetesModel.class).orElse(null) == null) {
                return false;
            }
        }
        return true;
    }

    protected KubernetesModel getKubernetesModel() {
        Yaml.Document doc = getCursor().firstEnclosing(Yaml.Document.class);
        if (doc == null) {
            throw new IllegalStateException("The KubernetesModel marker is placed on Yaml.Document elements, " +
                                            "but no Yaml.Document could be found in " + getCursor());
        }
        return doc.getMarkers()
                .findFirst(KubernetesModel.class)
                .orElseThrow(() -> new IllegalStateException("KubernetesVisitor should not be visiting a YAML document without a KubernetesModel"));
    }

    public void maybeUpdateModel() {
        for (TreeVisitor afterVisit : getAfterVisit()) {
            if (afterVisit instanceof UpdateKubernetesModel) {
                return;
            }
        }
        doAfterVisit(new UpdateKubernetesModel<>());
    }
}