#81 - Add the missing toFloat() toDouble() type conversion methods

These are used for query parameters allowing null/empty values (as opposed to `asFloat()` which does not allow nulls).

Author: rbygrave

http-api/src/main/java/io/avaje/http/api/PathTypeConversion.java

@@ -228,6 +228,33 @@ public static Long toLong(String value) {
     }
   }
 
+  /**
+   * Convert to Double (allowing nulls).
+   */
+  public static Double toDouble(String value) {
+    if (isNullOrEmpty(value)) {
+      return null;
+    }
+    try {
+      return Double.valueOf(value);
+    } catch (NumberFormatException e) {
+      throw new InvalidTypeArgumentException(e);
+    }
+  }
+  /**
+   * Convert to Float (allowing nulls).
+   */
+  public static Float toFloat(String value) {
+    if (isNullOrEmpty(value)) {
+      return null;
+    }
+    try {
+      return Float.valueOf(value);
+    } catch (NumberFormatException e) {
+      throw new InvalidTypeArgumentException(e);
+    }
+  }
+
   /**
    * Convert to BigDecimal (allowing nulls).
    */

http-api/src/test/java/io/avaje/http/api/PathTypeConversionTest.java

@@ -252,6 +252,28 @@ void toLong_invalid() {
     assertThrows(InvalidTypeArgumentException.class, () -> PathTypeConversion.toLong("junk"));
   }
 
+  @Test
+  void toDouble() {
+    assertThat(PathTypeConversion.toDouble("42")).isEqualTo(42D);
+    assertThat(PathTypeConversion.toDouble(null)).isNull();
+  }
+
+  @Test
+  void toDouble_invalid() {
+    assertThrows(InvalidTypeArgumentException.class, () -> PathTypeConversion.toDouble("junk"));
+  }
+
+  @Test
+  void toFloat() {
+    assertThat(PathTypeConversion.toFloat("42")).isEqualTo(42F);
+    assertThat(PathTypeConversion.toFloat(null)).isNull();
+  }
+
+  @Test
+  void toFloat_invalid() {
+    assertThrows(InvalidTypeArgumentException.class, () -> PathTypeConversion.toFloat("junk"));
+  }
+
   @Test
   void toBigDecimal() {
     assertThat(PathTypeConversion.toBigDecimal("42.45")).isEqualByComparingTo("42.45");