Improve absolute path detection.

Use URI to decode URI encoded absolute paths.
See jenkinsci/analysis-model#1021

src/main/java/edu/hm/hafner/util/PathUtil.java

@@ -1,6 +1,8 @@
 package edu.hm.hafner.util;
 
 import java.io.IOException;
+import java.net.URI;
+import java.net.URISyntaxException;
 import java.nio.file.Files;
 import java.nio.file.LinkOption;
 import java.nio.file.Path;
@@ -259,6 +261,15 @@ public String createAbsolutePath(@CheckForNull final String directory, final Str
      * @return {@code true} if this path is an absolute path, {@code false} if a relative path
      */
     public boolean isAbsolute(final String fileName) {
+        try {
+            URI uri = new URI(fileName);
+            if (uri.isAbsolute()) {
+                return true;
+            }
+        }
+        catch (URISyntaxException ignored) {
+            // catch and ignore as system paths are not URI, and we need to check them separately
+        }
         return FilenameUtils.getPrefixLength(fileName) > 0;
     }
 

src/test/java/edu/hm/hafner/util/PathUtilTest.java

@@ -74,11 +74,11 @@ void shouldFindResourceFolder() {
 
     @DisplayName("Should verify valid absolute paths")
     @ParameterizedTest(name = "[{index}] path={0}")
-    @ValueSource(strings = {"/", "/tmp", "C:\\", "c:\\", "C:\\Tmp"})
+    @ValueSource(strings = {"/", "/tmp", "C:\\", "c:\\", "C:\\Tmp", "C:/tmp/absolute.txt", "file:///project/src/main/java/com/app/ui/model/Activity.kt"})
     void shouldFindAbsolutePaths(final String path) {
         var pathUtil = new PathUtil();
 
-        assertThat(pathUtil.isAbsolute(path)).isTrue();
+        assertThat(pathUtil.isAbsolute(path)).as("Show be detected as absolute path").isTrue();
     }
 
     @Test