Merge pull request #357 from brendandburns/parse

Add an example of how to parse and generate JSON.

Author: k8s-ci-robot

examples/src/main/java/io/kubernetes/client/examples/ParseExample.java

@@ -0,0 +1,64 @@
+/*
+Copyright 2018 The Kubernetes 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
+    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.kubernetes.client.examples;
+
+import io.kubernetes.client.ApiClient;
+import io.kubernetes.client.ApiException;
+import io.kubernetes.client.util.Config;
+import java.io.FileReader;
+import java.io.IOException;
+import java.io.StringReader;
+
+/**
+ * A simple example of how to parse a Kubernetes object.
+ *
+ * <p>Easiest way to run this: mvn exec:java
+ * -Dexec.mainClass="io.kubernetes.client.examples.ParseExample"
+ *
+ * <p>From inside $REPO_DIR/examples
+ */
+public class ParseExample {
+  public static void main(String[] args) throws IOException, ApiException, ClassNotFoundException {
+    if (args.length < 2) {
+      System.err.println("Usage: ParseExample <file-name> <class-name e.g. V1Pod>");
+      System.exit(1);
+    }
+    ApiClient client = Config.defaultClient();
+    FileReader json = new FileReader(args[0]);
+    Object obj =
+        client
+            .getJSON()
+            .getGson()
+            .fromJson(json, Class.forName("io.kubernetes.client.models." + args[1]));
+
+    String output = client.getJSON().getGson().toJson(obj);
+
+    // Test round tripping...
+    Object obj2 =
+        client
+            .getJSON()
+            .getGson()
+            .fromJson(
+                new StringReader(output), Class.forName("io.kubernetes.client.models." + args[1]));
+
+    String output2 = client.getJSON().getGson().toJson(obj2);
+
+    // Validate round trip
+    if (!output.equals(output2)) {
+      System.err.println("Error, expected:\n" + output + "\nto equal\n" + output2);
+      System.exit(2);
+    }
+
+    System.out.println(output);
+  }
+}