added support for path level regex matching

nb-api/src/main/java/io/nosqlbench/nb/api/content/NBIO.java

@@ -245,10 +245,11 @@ public class NBIO implements NBPathsAPI.Facets {
                     if (!extension.startsWith(".")) {
                         extension = "." + extension;
                     }
+
                     String pattern = name.endsWith(extension) ? name : name + Pattern.quote(extension);
                     RegexPathFilter filter = new RegexPathFilter(pattern);
 
-                    NBIOWalker.walk(path, capture, filter);
+                    NBIOWalker.walkFullPath(path, capture, filter);
                 }
 
             }
@@ -267,6 +268,10 @@ public class NBIO implements NBPathsAPI.Facets {
         private final Pattern regex;
 
         public RegexPathFilter(String pattern) {
+            if (!pattern.startsWith("^")) {
+                pattern = ".*" + pattern;
+            }
+
             this.regex = Pattern.compile(pattern);
         }
 

nb-api/src/main/java/io/nosqlbench/nb/api/content/NBIOWalker.java

@@ -5,6 +5,7 @@ import org.apache.logging.log4j.Logger;
 
 import java.io.IOException;
 import java.nio.file.DirectoryStream;
+import java.nio.file.Files;
 import java.nio.file.Path;
 import java.nio.file.attribute.BasicFileAttributes;
 import java.nio.file.spi.FileSystemProvider;
@@ -13,8 +14,9 @@ import java.util.List;
 
 public class NBIOWalker {
     private final static Logger logger = LogManager.getLogger(NBIOWalker.class);
+
     public static void walk(Path p, PathVisitor v) {
-        walk(p,v,NBIOWalker.WALK_ALL);
+        walkShortPath(p, v, NBIOWalker.WALK_ALL);
     }
 
     public static List<Path> findAll(Path p) {
@@ -24,24 +26,60 @@ public class NBIOWalker {
 
     }
 
-    public static void walk(Path p, PathVisitor v, DirectoryStream.Filter<Path> filter) {
+    /**
+     * This walks the directory structure starting at the path specified. The path visitor is invoked for every
+     * directory, and every non-directory which matches the filter.
+     * This form uses only the filename component in Paths to be matched by the filter, and the short name is also
+     * what is returned by the filter.
+     *
+     * @param p The path to search
+     * @param v The visitor to accumulate or operate on matched paths and all directories
+     * @param filter The Path filter to determine whether a path is included
+     */
+    public static void walkShortPath(Path p, PathVisitor v, DirectoryStream.Filter<Path> filter) {
+        walk(null, p, v, filter, false);
+    }
+
+    /**
+     * This walks the directory structure starting at the path specified. The path visitor is invoked for every
+     * directory, and every non-directory which matches the filter.
+     * This form uses only the full path from the initial search path root in all Paths to be matched by
+     * the filter, and this form of a Path component is also returned in all Paths seen by the visitor.
+     *
+     * @param p The path to search
+     * @param v The visitor to accumulate or operate on matched paths and all directories
+     * @param filter The Path filter to determine whether a path is included
+     */
+    public static void walkFullPath(Path p, PathVisitor v, DirectoryStream.Filter<Path> filter) {
+        walk(null, p, v, filter, true);
+    }
+
+    public static void walk(Path root, Path p, PathVisitor v, DirectoryStream.Filter<Path> filter, boolean fullpath) {
+
         try {
             FileSystemProvider provider = p.getFileSystem().provider();
             DirectoryStream<Path> paths = provider.newDirectoryStream(p, (Path r) -> true);
             List<Path> pathlist = new ArrayList<>();
+
             for (Path path : paths) {
                 pathlist.add(path);
             }
+
             for (Path path : pathlist) {
+                if (fullpath && root != null) {
+                    path = root.resolve(path);
+                }
+
                 if (path.getFileSystem().provider().readAttributes(path, BasicFileAttributes.class).isDirectory()) {
                     v.preVisitDir(path);
-                    walk(path, v, filter);
+                    walk(root, path, v, filter, fullpath);
                     v.postVisitDir(path);
                 } else if (filter.accept(path)) {
                     v.preVisitFile(path);
                     v.visit(path);
                     v.postVisitFile(path);
                 }
+
             }
         } catch (IOException e) {
             throw new RuntimeException(e);
@@ -50,10 +88,18 @@ public class NBIOWalker {
 
     public interface PathVisitor {
         void visit(Path p);
-        default void preVisitFile(Path path) {}
-        default void postVisitFile(Path path) {}
-        default void preVisitDir(Path path) {}
-        default void postVisitDir(Path path) {}
+
+        default void preVisitFile(Path path) {
+        }
+
+        default void postVisitFile(Path path) {
+        }
+
+        default void preVisitDir(Path path) {
+        }
+
+        default void postVisitDir(Path path) {
+        }
     }
 
     public static DirectoryStream.Filter<Path> WALK_ALL = entry -> true;

nb-api/src/test/java/io/nosqlbench/nb/api/content/NBIOTest.java

@@ -98,4 +98,15 @@ public class NBIOTest {
         assertThat(list).hasSize(3);
     }
 
+    @Test
+    public void testPathSearchForSuffix() {
+        List<Content<?>> list = NBIO.classpath()
+            .prefix("nesteddir1")
+            .regex()
+            .name("nesteddir2/testdata12")
+            .extension("txt")
+            .list();
+        assertThat(list).hasSize(1);
+    }
+
 }