FileSystemThemeProvider: Catch exception thrown if CcmFiles is not configured, return empty list

ccm-core/src/main/java/org/libreccm/files/CcmFiles.java

@@ -172,9 +172,10 @@ public class CcmFiles {
             if (adapter.isConfigured()) {
                 return adapter;
             } else {
-                throw new UnexpectedErrorException(
+                throw new CcmFilesNotConfiguredException(
                     "Only the default FileSystemAdapter is available but is "
-                        + "not correctly configured.");
+                        + "not correctly configured."
+                );
             }
         }
     }
@@ -196,7 +197,9 @@ public class CcmFiles {
         final String dataPath = filesConf.getDataPath();
 
         if (dataPath == null || dataPath.trim().isEmpty()) {
-            throw new UnexpectedErrorException("dataPath is not configured.");
+            throw new CcmFilesNotConfiguredException(
+                "dataPath is not configured."
+            );
         }
 
         if (dataPath.endsWith("/")) {

ccm-core/src/main/java/org/libreccm/files/CcmFilesNotConfiguredException.java

@@ -0,0 +1,67 @@
+/*
+ * Copyright (C) 2020 LibreCCM Foundation.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301  USA
+ */
+
+package org.libreccm.files;
+
+/**
+ *
+ * @author <a href="mailto:jens.pelzetter@googlemail.com">Jens Pelzetter</a>
+ */
+public class CcmFilesNotConfiguredException extends RuntimeException {
+
+    private static final long serialVersionUID = 1L;
+
+    /**
+     * Creates a new instance of <code>CcmFilesNotConfiguredException</code> without detail message.
+     */
+    public CcmFilesNotConfiguredException() {
+        super();
+    }
+
+
+    /**
+     * Constructs an instance of <code>CcmFilesNotConfiguredException</code> with the specified detail message.
+     *
+     * @param msg The detail message.
+     */
+    public CcmFilesNotConfiguredException(final String msg) {
+        super(msg);
+    }
+
+    /**
+      * Constructs an instance of <code>CcmFilesNotConfiguredException</code> which wraps the 
+      * specified exception.
+      *
+      * @param exception The exception to wrap.
+      */
+    public CcmFilesNotConfiguredException(final Exception exception) {
+        super(exception);
+    }
+
+    /**
+      * Constructs an instance of <code>CcmFilesNotConfiguredException</code> with the specified message which also wraps the 
+      * specified exception.
+      *
+      * @param msg The detail message.
+      * @param exception The exception to wrap.
+      */
+    public CcmFilesNotConfiguredException(final String msg, final Exception exception) {
+        super(msg, exception);
+    }
+}

ccm-core/src/main/java/org/libreccm/theming/FileSystemThemeProvider.java

@@ -18,8 +18,11 @@
  */
 package org.libreccm.theming;
 
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
 import org.libreccm.core.UnexpectedErrorException;
 import org.libreccm.files.CcmFiles;
+import org.libreccm.files.CcmFilesNotConfiguredException;
 import org.libreccm.files.DirectoryNotEmptyException;
 import org.libreccm.files.FileAccessException;
 import org.libreccm.files.FileAlreadyExistsException;
@@ -54,6 +57,10 @@ public class FileSystemThemeProvider implements ThemeProvider {
 
     private static final long serialVersionUID = 1L;
     
+    private static final Logger LOGGER = LogManager.getLogger(
+        FileSystemThemeProvider.class
+    );
+
     private static final String BASE_PATH = "/themes";
     private static final String DRAFT_THEMES_PATH = BASE_PATH + "/draft";
     private static final String LIVE_THEMES_PATH = BASE_PATH + "/live";
@@ -74,7 +81,6 @@ public class FileSystemThemeProvider implements ThemeProvider {
     public List<ThemeInfo> getThemes() {
 
         try {
-
             if (!ccmFiles.isDirectory(BASE_PATH)
                     || !ccmFiles.isDirectory(DRAFT_THEMES_PATH)) {
 
@@ -92,8 +98,10 @@ public class FileSystemThemeProvider implements ThemeProvider {
         } catch (FileAccessException
                      | FileDoesNotExistException
                      | InsufficientPermissionsException ex) {
-
             throw new UnexpectedErrorException(ex);
+        } catch(CcmFilesNotConfiguredException ex) {
+            LOGGER.warn(ex);
+            return Collections.emptyList();
         }
     }
 
@@ -119,6 +127,9 @@ public class FileSystemThemeProvider implements ThemeProvider {
                      | InsufficientPermissionsException ex) {
 
             throw new UnexpectedErrorException(ex);
+        } catch(CcmFilesNotConfiguredException ex) {
+            LOGGER.warn(ex);
+            return Collections.emptyList();
         }
     }