From 6d3836e41493f89c5b8700cca34111319e9fa41a Mon Sep 17 00:00:00 2001
From: ulrich
Date: Sat, 27 Mar 2021 16:41:01 +0000
Subject: [PATCH] Kommentare ergaenzt

---
 src/de/uhilger/minsrv/App.java |  105 +++++++++++++++++++++++++++++++++++++---------------
 1 files changed, 74 insertions(+), 31 deletions(-)

diff --git a/src/de/uhilger/minsrv/App.java b/src/de/uhilger/minsrv/App.java
index da44463..0e41848 100644
--- a/src/de/uhilger/minsrv/App.java
+++ b/src/de/uhilger/minsrv/App.java
@@ -1,21 +1,20 @@
 /*
-    mc2 - Mediacenter neu
-    Copyright (C) 2021  Ulrich Hilger
+  mini-server - Ein minimalistischer HTTP-Server
+  Copyright (C) 2021  Ulrich Hilger
 
-    This program is free software: you can redistribute it and/or modify
-    it under the terms of the GNU Affero General Public License as
-    published by the Free Software Foundation, either version 3 of the
-    License, or (at your option) any later version.
+  This program is free software: you can redistribute it and/or modify
+  it under the terms of the GNU Affero General Public License as
+  published by the Free Software Foundation, either version 3 of the
+  License, or (at your option) any later version.
 
-    This program is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    GNU Affero General Public License for more details.
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU Affero General Public License for more details.
 
-    You should have received a copy of the GNU Affero General Public License
-    along with this program.  If not, see <https://www.gnu.org/licenses/>.
-*/
-
+  You should have received a copy of the GNU Affero General Public License
+  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
 package de.uhilger.minsrv;
 
 import java.io.IOException;
@@ -24,47 +23,91 @@
 import java.util.logging.Logger;
 
 /**
+ * <p>Die Hauptklasse des mini-server</p>
  *
- * @author ulrich
+ * <p>Folgende Kommandozeilenparameter werden verarbeitet </p>
+ * 
+ * <p>ctx - Kontext des Servers <br>
+ * www-data - lokales Datenverzeichnis <br>
+ * port - Port</p>>
+ *
+ * <p>Beispiel: <code>java -jar mini-server.jar ctx="srv" www-data="/home/fred/www"
+ * port=9090</code></p>
+ *
+ * <p>Startet den Server auf http://localhost:9090/srv und liefert Inhalte aus
+ * dem Verzeichnis <code>/home/fred/www</code> aus.
+ *
+ * Ein Aufruf von http://localhost:9090/srv/pfad/zum/inhalt/index.html liefert
+ * also die Datei 'index.html' aus dem Ordner /home/fred/www/pfad/zum/inhalt
+ * aus.</p>
+ * 
+ * <p>Mit http://localhost:9090/srv/server/stop werden Server und App 
+ * beendet.</p>
+ *
+ * @author Ulrich Hilger
  * @version 0.1, 25.03.2021
  */
 public class App {
 
   private static final Logger logger = Logger.getLogger(App.class.getName());
-  
+
   public static final String IP_PORT = "port";
   public static final String IP_WWW_DATA = "www-data";
-  
-  private static HashMap initParams;  
-  
+  public static final String IP_CTX = "ctx";
+
+  private static HashMap initParams;
+
   /**
-   * @param args the command line arguments
+   * <p>Start-Methode dieser Anwendung</p>
+   *
+   * @param args Kommandozeilenparameter
    */
   public static void main(String[] args) {
     initParams = new HashMap();
-    for(String arg: args) {
+    for (String arg : args) {
       String[] argParts = arg.split("=");
       initParams.put(argParts[0], argParts[1]);
     }
-        
-    Server server = new Server(Integer.parseInt(getInitParameter(IP_PORT)));
-    try {
-      server.start();
-    } catch (IOException ex) {
-      Logger.getLogger(App.class.getName()).log(Level.SEVERE, null, ex);
+
+    String portStr = getInitParameter(IP_PORT);
+    if (portStr != null) {
+      Server server = new Server(Integer.parseInt(portStr));
+      try {
+        String ctxName = getInitParameter(IP_CTX);
+        if (ctxName != null) {
+          server.setContextName(ctxName);
+          server.start();
+        } else {
+          logger.severe("Der Parameter " + IP_CTX + " muss angegeben werden.");
+        }
+      } catch (IOException ex) {
+        Logger.getLogger(App.class.getName()).log(Level.SEVERE, null, ex);
+      }
+    } else {
+      logger.severe("Der Parameter " + IP_PORT + " muss angegeben werden.");
     }
   }
-  
+
+  /**
+   * Diese Anwendung stoppen
+   */
   public static void stop() {
     System.exit(0);
   }
-  
+
+  /**
+   * Einen Kommandozeilenparameter ermitteln
+   *
+   * @param pname Names des Parameters
+   * @return Inhalt des Parameters oder null, wenn der Parameter nicht gefunden
+   * wurde
+   */
   public static String getInitParameter(String pname) {
     String param = null;
     Object o = initParams.get(pname);
-    if(o != null) {
+    if (o != null) {
       param = o.toString();
     }
     return param;
-  } 
+  }
 }

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