feat: ARM-arch is now supported, avoid always recomputing values (#48)

Author: metacosm

core/src/main/java/io/javaoperatorsdk/jenvtest/binary/OSInfo.java

@@ -1,30 +1,37 @@
 package io.javaoperatorsdk.jenvtest.binary;
 
 public class OSInfo {
+  private final String os;
+  private final String arch;
 
-  public String getOSName() {
-    String os = System.getProperty("os.name").toLowerCase();
+  public OSInfo() {
+    final var osArch = System.getProperty("os.arch").toLowerCase();
+    switch (osArch) {
+      case "ppc64":
+        arch = "ppc64le";
+        break;
+      case "aarch64":
+        arch = "arm64";
+        break;
+      default:
+        arch = "amd64";
+    }
+
+    final var os = System.getProperty("os.name").toLowerCase();
     if (os.contains("win")) {
-      return "windows";
+      this.os = "windows";
     } else if (os.contains("mac")) {
-      return "darwin";
+      this.os = "darwin";
     } else {
-      return os;
+      this.os = os;
     }
   }
 
-  /**
-   * Only amd64 and ppc64 binaries available.
-   *
-   * @return ppc64le if on that architecture otherwise amd64.
-   */
-  public String getOSArch() {
-    var osArch = System.getProperty("os.arch").toLowerCase();
-    if (osArch.contains("ppc64")) {
-      return "ppc64le";
-    } else {
-      return "amd64";
-    }
+  public String getOSName() {
+    return os;
   }
 
+  public String getOSArch() {
+    return arch;
+  }
 }