refactored, pre-buffer reuse

flash/src/test/java/dev/relism/models/PathParamsTest.java

@@ -0,0 +1,67 @@
+package dev.relism.models;
+
+import dev.relism.fpr.core.ByteView;
+import org.junit.jupiter.api.Test;
+
+import java.nio.charset.StandardCharsets;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class PathParamsTest {
+
+    // --- helpers ---
+
+    private static PathParams of(String path, String... paramsPairs) {
+        byte[] bytes = path.getBytes(StandardCharsets.UTF_8);
+        ByteView view = new ByteView() {
+            public int length() { return bytes.length; }
+            public byte byteAt(int idx) { return bytes[idx]; }
+        };
+        
+        String[] names = new String[paramsPairs.length / 2];
+        int[] starts = new int[paramsPairs.length / 2];
+        int[] lens = new int[paramsPairs.length / 2];
+        
+        for (int i = 0; i + 1 < paramsPairs.length; i += 2) {
+            names[i / 2] = paramsPairs[i];
+            String val = paramsPairs[i + 1];
+            starts[i / 2] = path.indexOf(val);
+            lens[i / 2] = val.length();
+        }
+        
+        return new PathParams(view, names, starts, lens);
+    }
+
+    // --- get ---
+
+    @Test
+    void get_existingParam() {
+        PathParams params = of("/users/123/posts/456", "userId", "123", "postId", "456");
+        assertEquals("123", params.get("userId"));
+        assertEquals("456", params.get("postId"));
+    }
+
+    @Test
+    void get_missingParam_returnsNull() {
+        PathParams params = of("/users/123", "userId", "123");
+        assertNull(params.get("unknown"));
+    }
+
+    // --- view ---
+
+    @Test
+    void view_existingParamZeroCopy() {
+        PathParams params = of("/users/123", "userId", "123");
+        ByteView view = params.view("userId");
+        assertNotNull(view);
+        assertEquals(3, view.length());
+        assertEquals('1', view.byteAt(0));
+        assertEquals('3', view.byteAt(2));
+    }
+
+    @Test
+    void view_missingParam_returnsNull() {
+        PathParams params = of("/users/123", "userId", "123");
+        assertNull(params.view("unknown"));
+    }
+}