fix: trace exception when deleting physical files (#168)

Signed-off-by: Jesse Gorzinski <17914061+ThePrez@users.noreply.github.com>

src/main/java/com/ibm/as400/access/IFSFile.java

@@ -892,6 +892,36 @@ Returns false if the file system object did not exist prior to the delete() or i
   public boolean delete()
     throws IOException
   {
+    // If it looks like it's in QSYS, then the stream file operation to the host server will likely not work. For
+    // files and members, though, we can handle specially here. 
+    if(isInQsys()) {
+      AS400File tmpPF = null;
+      ObjectDescription objectDescription = new ObjectDescription(system_, path_.replaceAll("//+", "/"));
+      try {
+        String type = objectDescription.getType();
+        switch (type) {
+          case "FILE": //note: includes *SAVF objects
+            tmpPF = new SequentialFile(system_, objectDescription.getPath());
+            tmpPF.delete();
+            return true;
+          case "MBR":
+            tmpPF = new SequentialFile(system_, objectDescription.getPath());
+            tmpPF.deleteMember();
+            return true;
+        }
+      } catch (AS400SecurityException | InterruptedException | IOException | ErrorCompletingRequestException e) {
+        Trace.log(
+            Trace.WARNING, "Unable to delete QSYS file using classic techniques. Will try host server stream file operations."+path_, e);
+      } finally {
+        if(null != tmpPF) { 
+          try {
+            tmpPF.close();
+          } catch (AS400Exception | AS400SecurityException | InterruptedException | IOException e) {
+            Trace.log(Trace.ERROR, "Unexpected error closing file "+path_, e);
+          }
+        }
+      }
+    }
     int returnCode = IFSReturnCodeRep.FILE_NOT_FOUND;
     try
     {
@@ -1776,7 +1806,22 @@ public String getSubtype()
     }
     return subType_;
   }
+  private boolean isInFileSystem(String _fs) {
+    String lowercasePath = path_.toLowerCase().replaceAll("//+","/");
+    return lowercasePath.equals("/"+_fs.toLowerCase()) || lowercasePath.startsWith("/"+_fs.toLowerCase()+"/");
 
+  }
+
+  public boolean isInQOpenSys() {
+    return isInFileSystem("QOpenSys");
+  }
+
+  public boolean isInQsys() {
+    return isInFileSystem("qsys.lib");
+  }
+  public boolean isInQDLS() {
+    return isInFileSystem("qdls");
+  }
 
   /**
    Determines if the file is an IBM i "source physical file".

src/main/java/com/ibm/as400/access/IFSFileImplRemote.java

@@ -1771,6 +1771,11 @@ public boolean isHidden()
 
     return result;
   }
+
+  private boolean isInQsys() {
+    String lowercasePath = fd_.path_.toLowerCase().replaceAll("//+","/");
+    return lowercasePath.equals("/qsys.lib") || lowercasePath.startsWith("/qsys.lib/");
+  }
 
   /**
    Determines if the integrated file system object represented by this
@@ -1827,6 +1832,12 @@ public boolean isSymbolicLink()
     //
     if (!determinedIsSymbolicLink_)
     {
+      // QSYS doesn't support symbolic links, so no need to check
+      if(isInQsys()) {
+        isSymbolicLink_ = false;
+        determinedIsSymbolicLink_ = true;
+        return isSymbolicLink_;
+      }
       // Note: As of V5R3, we can't get accurate symbolic link info by querying the attrs of a specific file.
       // Instead, we must query the contents of the parent directory.
       int pathLen = fd_.path_.length();