feature: add a v2 crd generator based on jackson

closes: fabric8io#5948

also removes v1beta1 from the new code

crd-generator/api-v2/pom.xml

@@ -0,0 +1,81 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+
+    Copyright (C) 2015 Red Hat, Inc.
+
+    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.
+
+-->
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <parent>
+    <artifactId>crd-generator-parent</artifactId>
+    <groupId>io.fabric8</groupId>
+    <version>6.13-SNAPSHOT</version>
+  </parent>
+  <modelVersion>4.0.0</modelVersion>
+
+  <artifactId>crd-generator-api-v2</artifactId>
+  <name>Fabric8 :: CRD generator :: API V2</name>
+
+  <dependencies>
+    <dependency>
+      <groupId>io.fabric8</groupId>
+      <artifactId>kubernetes-client-api</artifactId>
+      <scope>compile</scope>
+    </dependency>
+
+    <dependency>
+      <groupId>com.fasterxml.jackson.module</groupId>
+      <artifactId>jackson-module-jsonSchema</artifactId>
+    </dependency>
+
+    <dependency>
+      <groupId>io.fabric8</groupId>
+      <artifactId>generator-annotations</artifactId>
+    </dependency>
+
+    <dependency>
+      <groupId>io.fabric8</groupId>
+      <artifactId>kubernetes-model-common</artifactId>
+    </dependency>
+
+    <!-- Testing -->
+    <dependency>
+      <groupId>org.junit.jupiter</groupId>
+      <artifactId>junit-jupiter-api</artifactId>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>org.junit.jupiter</groupId>
+      <artifactId>junit-jupiter-engine</artifactId>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>org.slf4j</groupId>
+      <artifactId>slf4j-simple</artifactId>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>javax.validation</groupId>
+      <artifactId>validation-api</artifactId>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>org.projectlombok</groupId>
+      <artifactId>lombok</artifactId>
+      <scope>test</scope>
+    </dependency>
+  </dependencies>
+</project>

crd-generator/api-v2/src/main/java/io/fabric8/crdv2/generator/AbstractCustomResourceHandler.java

@@ -0,0 +1,72 @@
+/*
+ * Copyright (C) 2015 Red Hat, Inc.
+ *
+ * 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 io.fabric8.crdv2.generator;
+
+import io.fabric8.crd.generator.annotation.PrinterColumn;
+import io.fabric8.crdv2.generator.AbstractJsonSchema.AnnotationMetadata;
+import io.fabric8.crdv2.generator.decorator.Decorator;
+import io.fabric8.kubernetes.client.utils.Utils;
+
+import java.util.Map;
+
+/**
+ * This class encapsulates the common behavior between v1beta1 and v1 CRD generation logic. The
+ * intent is that each CRD spec version is implemented as a sub-class of this one.
+ */
+public abstract class AbstractCustomResourceHandler {
+
+  protected final Resources resources;
+
+  protected AbstractCustomResourceHandler(Resources resources) {
+    this.resources = resources;
+  }
+
+  public abstract void handle(CustomResourceInfo config);
+
+  protected void handlePrinterColumns(String name, String version, Map<String, AnnotationMetadata> additionalPrinterColumns) {
+    additionalPrinterColumns.forEach((path, property) -> {
+      PrinterColumn printerColumn = ((PrinterColumn)property.annotation);
+      String column = printerColumn.name();
+      if (Utils.isNullOrEmpty(column)) {
+        column = path.substring(path.lastIndexOf("."));
+      }
+      String format = printerColumn.format();
+      int priority = printerColumn.priority();
+
+      // TODO: add description to the annotation? The previous logic considered the comments, which are not available here
+      String description = property.description;
+
+      resources.decorate(
+          getPrinterColumnDecorator(name, version, path, property.type, column, description, format, priority));
+    });
+  }
+
+  /**
+   * Provides the decorator implementation associated with the CRD generation version.
+   *
+   * @param name the resource name
+   * @param version the associated version
+   * @param path the path from which the printer column is extracted
+   * @param type the data type of the printer column
+   * @param column the name of the column
+   * @param description the description of the column
+   * @param format the format of the printer column
+   * @return the concrete decorator implementing the addition of a printer column to the currently built CRD
+   */
+  protected abstract Decorator<?> getPrinterColumnDecorator(String name, String version, String path,
+      String type, String column, String description, String format, int priority);
+
+}