From 33613a85afc4b1481367fbe92a17ee59c240250b Mon Sep 17 00:00:00 2001
From: Sven Eisenhauer <sven@sven-eisenhauer.net>
Date: Fri, 10 Nov 2023 15:11:48 +0100
Subject: add new repo

---
 .../hjp5/examples/RunCommand.java                  | 101 +++++++++++++++++++++
 1 file changed, 101 insertions(+)
 create mode 100644 Master/Reference Architectures and Patterns/hjp5/examples/RunCommand.java

(limited to 'Master/Reference Architectures and Patterns/hjp5/examples/RunCommand.java')

diff --git a/Master/Reference Architectures and Patterns/hjp5/examples/RunCommand.java b/Master/Reference Architectures and Patterns/hjp5/examples/RunCommand.java
new file mode 100644
index 0000000..03f1de9
--- /dev/null
+++ b/Master/Reference Architectures and Patterns/hjp5/examples/RunCommand.java	
@@ -0,0 +1,101 @@
+/* RunCommand.java */
+
+import java.io.*;
+
+public class RunCommand
+{
+  static final int MODE_UNCONNECTED = 0;
+  static final int MODE_WAITFOR     = 1;
+  static final int MODE_CATCHOUTPUT = 2;
+
+  private static void runCommand(String cmd, int mode)
+  throws IOException
+  {
+    Runtime rt = Runtime.getRuntime();
+    System.out.println("Running " + cmd);
+    Process pr = rt.exec(cmd);
+    if (mode == MODE_WAITFOR) {
+      System.out.println("waiting for termination");
+      try {
+        pr.waitFor();
+      } catch (InterruptedException e) {
+      }
+    } else if (mode == MODE_CATCHOUTPUT) {
+      System.out.println("catching output");
+      BufferedReader procout = new BufferedReader(
+        new InputStreamReader(pr.getInputStream())
+      );
+      String line;
+      while ((line = procout.readLine()) != null) {
+        System.out.println("  OUT> " + line);
+      }
+    }
+    try {
+      System.out.println(
+        "done, return value is " + pr.exitValue()
+      );
+    } catch (IllegalThreadStateException e) {
+      System.out.println(
+        "ok, process is running asynchronously"
+      );
+    }
+  }
+
+  private static void runShellCommand(String cmd, int mode) 
+  throws IOException
+  {
+    String prefix = "";
+    String osName = System.getProperty("os.name");
+    osName = osName.toLowerCase();
+    if (osName.indexOf("windows") != -1) {
+      if (osName.indexOf("95") != -1) {
+        prefix = "command.com /c ";
+      } else if (osName.indexOf("98") != -1) {
+        prefix = "command.com /c ";
+      }
+    }
+    if (prefix.length() <= 0) {
+      System.out.println(
+        "unknown OS: don\'t know how to invoke shell"
+      );
+    } else {
+      runCommand(prefix + cmd, mode);
+    }
+  }
+
+  public static void main(String[] args)
+  {
+    try {
+      if (args.length <= 0) {
+        System.out.println(
+          "Usage: java RunCommand [-shell] " +
+          "[-waitfor|-catchoutput] <command>"
+        );
+        System.exit(1);
+      }
+      boolean shell = false;
+      int mode = MODE_UNCONNECTED;
+      String cmd = "";
+      for (int i = 0; i < args.length; ++i) {
+        if (args[i].startsWith("-")) {
+          if (args[i].equals("-shell")) {
+            shell = true;
+          } else if (args[i].equals("-waitfor")) {
+            mode = MODE_WAITFOR;
+          } else if (args[i].equals("-catchoutput")) {
+            mode = MODE_CATCHOUTPUT;
+          }
+        } else {
+          cmd = args[i];
+        }
+      }
+      if (shell) {
+        runShellCommand(cmd, mode);
+      } else {
+        runCommand(cmd, mode);
+      }
+    } catch (Exception e) {
+      System.err.println(e.toString());
+    }
+  }
+}
\ No newline at end of file
-- 
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