diff --git a/src/main/java/org/jpeek/App.java b/src/main/java/org/jpeek/App.java
index 27b6e495..9361c9ad 100644
--- a/src/main/java/org/jpeek/App.java
+++ b/src/main/java/org/jpeek/App.java
@@ -47,7 +47,6 @@
 import org.cactoos.scalar.AndInThreads;
 import org.cactoos.scalar.IoChecked;
 import org.cactoos.scalar.LengthOf;
-import org.jpeek.calculus.Calculus;
 import org.jpeek.calculus.xsl.XslCalculus;
 import org.jpeek.skeleton.Skeleton;
 import org.xembly.Directives;
@@ -171,11 +170,10 @@ public void analyze() throws IOException {
         final XSL chain = new XSLChain(layers);
         this.save(skeleton.toString(), "skeleton.xml");
         final Collection<Report> reports = new LinkedList<>();
-        final Calculus xsl = new XslCalculus();
         if (this.params.containsKey("LCOM")) {
             reports.add(
                 new XslReport(
-                    chain.transform(skeleton), xsl,
+                    chain.transform(skeleton), new XslCalculus("LCOM"),
                     new ReportData("LCOM", this.params, 10.0d, -5.0d)
                 )
             );
@@ -183,7 +181,7 @@ public void analyze() throws IOException {
         if (this.params.containsKey("CAMC")) {
             reports.add(
                 new XslReport(
-                    chain.transform(skeleton), xsl,
+                    chain.transform(skeleton), new XslCalculus("CAMC"),
                     new ReportData("CAMC", this.params)
                 )
             );
@@ -191,7 +189,7 @@ public void analyze() throws IOException {
         if (this.params.containsKey("MMAC")) {
             reports.add(
                 new XslReport(
-                    chain.transform(skeleton), xsl,
+                    chain.transform(skeleton), new XslCalculus("MMAC"),
                     new ReportData("MMAC", this.params, 0.5d, 0.1d)
                 )
             );
@@ -199,7 +197,7 @@ public void analyze() throws IOException {
         if (this.params.containsKey("LCOM5")) {
             reports.add(
                 new XslReport(
-                    chain.transform(skeleton), xsl,
+                    chain.transform(skeleton), new XslCalculus("LCOM5"),
                     new ReportData("LCOM5", this.params, 0.5d, -0.1d)
                 )
             );
@@ -207,7 +205,7 @@ public void analyze() throws IOException {
         if (this.params.containsKey("LCOM4")) {
             reports.add(
                 new XslReport(
-                    chain.transform(skeleton), xsl,
+                    chain.transform(skeleton), new XslCalculus("LCOM4"),
                     new ReportData("LCOM4", this.params, 0.5d, -0.1d)
                 )
             );
@@ -215,7 +213,7 @@ public void analyze() throws IOException {
         if (this.params.containsKey("NHD")) {
             reports.add(
                 new XslReport(
-                    chain.transform(skeleton), xsl,
+                    chain.transform(skeleton), new XslCalculus("NHD"),
                     new ReportData("NHD")
                 )
             );
@@ -223,7 +221,7 @@ public void analyze() throws IOException {
         if (this.params.containsKey("LCOM2")) {
             reports.add(
                 new XslReport(
-                    chain.transform(skeleton), xsl,
+                    chain.transform(skeleton), new XslCalculus("LCOM2"),
                     new ReportData("LCOM2", this.params)
                 )
             );
@@ -231,7 +229,7 @@ public void analyze() throws IOException {
         if (this.params.containsKey("LCOM3")) {
             reports.add(
                 new XslReport(
-                    chain.transform(skeleton), xsl,
+                    chain.transform(skeleton), new XslCalculus("LCOM3"),
                     new ReportData("LCOM3", this.params)
                 )
             );
@@ -239,7 +237,7 @@ public void analyze() throws IOException {
         if (this.params.containsKey("SCOM")) {
             reports.add(
                 new XslReport(
-                    chain.transform(skeleton), xsl,
+                    chain.transform(skeleton), new XslCalculus("SCOM"),
                     new ReportData("SCOM", this.params)
                 )
             );
@@ -247,7 +245,7 @@ public void analyze() throws IOException {
         if (this.params.containsKey("OCC")) {
             reports.add(
                 new XslReport(
-                    chain.transform(skeleton), xsl,
+                    chain.transform(skeleton), new XslCalculus("OCC"),
                     new ReportData("OCC", this.params)
                 )
             );
@@ -255,7 +253,7 @@ public void analyze() throws IOException {
         if (this.params.containsKey("PCC")) {
             reports.add(
                 new XslReport(
-                    chain.transform(skeleton), xsl,
+                    chain.transform(skeleton), new XslCalculus("PCC"),
                     new ReportData("PCC")
                 )
             );
@@ -263,7 +261,7 @@ public void analyze() throws IOException {
         if (this.params.containsKey("TCC")) {
             reports.add(
                 new XslReport(
-                    chain.transform(skeleton), xsl,
+                    chain.transform(skeleton), new XslCalculus("TCC"),
                     new ReportData("TCC")
                 )
             );
@@ -271,7 +269,7 @@ public void analyze() throws IOException {
         if (this.params.containsKey("LCC")) {
             reports.add(
                 new XslReport(
-                    chain.transform(skeleton), xsl,
+                    chain.transform(skeleton), new XslCalculus("LCC"),
                     new ReportData("LCC")
                 )
             );
@@ -279,7 +277,7 @@ public void analyze() throws IOException {
         if (this.params.containsKey("CCM")) {
             reports.add(
                 new XslReport(
-                    chain.transform(skeleton), xsl,
+                    chain.transform(skeleton), new XslCalculus("CCM"),
                     new ReportData("CCM")
                 )
             );
@@ -287,7 +285,7 @@ public void analyze() throws IOException {
         if (this.params.containsKey("MWE")) {
             reports.add(
                 new XslReport(
-                    chain.transform(skeleton), xsl,
+                    chain.transform(skeleton), new XslCalculus("MWE"),
                     new ReportData("MWE")
                 )
             );
diff --git a/src/main/java/org/jpeek/XslReport.java b/src/main/java/org/jpeek/XslReport.java
index 14c6dbb9..69573211 100644
--- a/src/main/java/org/jpeek/XslReport.java
+++ b/src/main/java/org/jpeek/XslReport.java
@@ -136,6 +136,7 @@ final class XslReport implements Report {
      * @param target Target dir
      * @throws IOException If fails
      */
+    @Override
     @SuppressWarnings("PMD.GuardLogStatement")
     public void save(final Path target) throws IOException {
         final long start = System.currentTimeMillis();
@@ -192,9 +193,7 @@ private XML xml() throws IOException {
                         XslReport.SCHEMA_FILE
                     )
             ).applyQuietly(
-                this.calculus.node(
-                    this.metric, this.params, this.skeleton
-                ).node()
+                this.calculus.node(this.params, this.skeleton).node()
             )
         );
     }
diff --git a/src/main/java/org/jpeek/calculus/Calculus.java b/src/main/java/org/jpeek/calculus/Calculus.java
index 7fdd1895..53bbb4d7 100644
--- a/src/main/java/org/jpeek/calculus/Calculus.java
+++ b/src/main/java/org/jpeek/calculus/Calculus.java
@@ -36,30 +36,16 @@
  *  only we should also remove LCOM4.xsl part that is doing the calculus and let the xsl here just
  *  to build the structure of the xml result. This part is especially the one calculating
  *  "xsl:variable name='E'" L73->L89, and the one doing the division L97 -> L99
- * @todo #449:30min The `node` method in this interface was designed with only
- *  XSL implementation in mind - it uses the `metric` parameter to select the
- *  XSL file and uses that file to transform the `skeleton`. This makes Java
- *  based implementations a little awkward because the `metric` parameter
- *  becomes redundant: there is a Java implementation for each metric, and these
- *  implementations already know which metric they are for. The question becomes
- *  - how to select correct java implementation for a given metric and integrate
- *  it seamlessly with XSL calculus in `XslReport`. One option could be removing
- *  the `metric` parameter from the method and injecting a Calculus for a
- *  concrete metric in `XslReport` directly. Another could be implementing
- *  Chain Of Responsibility pattern. Decide on the best way to integrate Java
- *  based Calculus with XSL based Calculus in `XslReport` and implement it.
  */
 public interface Calculus {
 
     /**
      * Produces {@link XML} representing metrics values.
-     * @param metric Desired metric to calculate
      * @param params Params
      * @param skeleton Package input
      * @return XML document giving metrics values for classes
      * @throws IOException If fails
      */
-    XML node(String metric, Map<String, Object> params, XML skeleton)
-        throws IOException;
+    XML node(Map<String, Object> params, XML skeleton) throws IOException;
 
 }
diff --git a/src/main/java/org/jpeek/calculus/java/Ccm.java b/src/main/java/org/jpeek/calculus/java/Ccm.java
index c4c1693e..35d736eb 100644
--- a/src/main/java/org/jpeek/calculus/java/Ccm.java
+++ b/src/main/java/org/jpeek/calculus/java/Ccm.java
@@ -29,7 +29,6 @@
 import java.util.Map;
 import org.cactoos.io.ResourceOf;
 import org.cactoos.io.UncheckedInput;
-import org.cactoos.text.FormattedText;
 import org.cactoos.text.Joined;
 import org.jpeek.calculus.Calculus;
 
@@ -40,18 +39,7 @@
 public final class Ccm implements Calculus {
 
     @Override
-    public XML node(
-        final String metric,
-        final Map<String, Object> params,
-        final XML skeleton
-    ) {
-        if (!"ccm".equalsIgnoreCase(metric)) {
-            throw new IllegalArgumentException(
-                new FormattedText(
-                    "This metric is CCM, not %s.", metric
-                ).toString()
-            );
-        }
+    public XML node(final Map<String, Object> params, final XML skeleton) {
         return Ccm.withFixedNcc(
             new XSLDocument(
                 new UncheckedInput(
diff --git a/src/main/java/org/jpeek/calculus/java/Lcom4.java b/src/main/java/org/jpeek/calculus/java/Lcom4.java
index a960d216..1f073a56 100644
--- a/src/main/java/org/jpeek/calculus/java/Lcom4.java
+++ b/src/main/java/org/jpeek/calculus/java/Lcom4.java
@@ -41,8 +41,9 @@
 public final class Lcom4 implements Calculus {
 
     @Override
-    public XML node(final String metric, final Map<String, Object> params,
-        final XML skeleton) throws IOException {
+    public XML node(
+        final Map<String, Object> params, final XML skeleton
+    ) throws IOException {
         final XML result = new XSLDocument(
             new TextOf(
                 new ResourceOf("org/jpeek/metrics/LCOM4.xsl")
diff --git a/src/main/java/org/jpeek/calculus/xsl/XslCalculus.java b/src/main/java/org/jpeek/calculus/xsl/XslCalculus.java
index 544a1b98..72775240 100644
--- a/src/main/java/org/jpeek/calculus/xsl/XslCalculus.java
+++ b/src/main/java/org/jpeek/calculus/xsl/XslCalculus.java
@@ -40,13 +40,27 @@
  */
 public final class XslCalculus implements Calculus {
 
+    /**
+     * Name of the metric this Calculus is for.
+     */
+    private final String metric;
+
+    /**
+     * Ctor.
+     * @param metric Name of the metric this Calculus is for.
+     */
+    public XslCalculus(final String metric) {
+        this.metric = metric;
+    }
+
     @Override
-    public XML node(final String metric, final Map<String, Object> params,
-        final XML skeleton) throws IOException {
+    public XML node(
+        final Map<String, Object> params, final XML skeleton
+    ) throws IOException {
         return new XSLDocument(
             new TextOf(
                 new ResourceOf(
-                    new FormattedText("org/jpeek/metrics/%s.xsl", metric)
+                    new FormattedText("org/jpeek/metrics/%s.xsl", this.metric)
                 )
             ).asString(),
             Sources.DUMMY,
diff --git a/src/test/java/org/jpeek/MetricsTest.java b/src/test/java/org/jpeek/MetricsTest.java
index e0b90e56..421f6cbc 100644
--- a/src/test/java/org/jpeek/MetricsTest.java
+++ b/src/test/java/org/jpeek/MetricsTest.java
@@ -72,7 +72,7 @@ public void testsTarget(final String target, final String metric, final double v
         @TempDir final Path output)
         throws Exception {
         new XslReport(
-            new Skeleton(new FakeBase(target)).xml(), new XslCalculus(),
+            new Skeleton(new FakeBase(target)).xml(), new XslCalculus(metric),
             new ReportData(metric)
         ).save(output);
         final String xpath;
diff --git a/src/test/java/org/jpeek/XslReportTest.java b/src/test/java/org/jpeek/XslReportTest.java
index ce9ea791..2dd2539f 100644
--- a/src/test/java/org/jpeek/XslReportTest.java
+++ b/src/test/java/org/jpeek/XslReportTest.java
@@ -50,7 +50,9 @@ public final class XslReportTest {
     @Test
     public void createsXmlReport(@TempDir final Path output) throws IOException {
         new XslReport(
-            new Skeleton(new FakeBase()).xml(), new XslCalculus(), new ReportData("LCOM")
+            new Skeleton(new FakeBase()).xml(),
+            new XslCalculus("LCOM"),
+            new ReportData("LCOM")
         ).save(output);
         new Assertion<>(
             "Must LCOM.xml file exists",
@@ -72,7 +74,7 @@ public void createsXmlReportWithXpaths(@TempDir final Path output) throws IOExce
                     "NoMethods", "Bar", "OverloadMethods",
                     "OnlyOneMethodWithParams", "WithoutAttributes"
                 )
-            ).xml(), new XslCalculus(), new ReportData("LCOM")
+            ).xml(), new XslCalculus("LCOM"), new ReportData("LCOM")
         ).save(output);
         new Assertion<>(
             "Must create LCOM report",
@@ -89,7 +91,9 @@ public void createsXmlReportWithXpaths(@TempDir final Path output) throws IOExce
     @Test
     public void createsXmlReportWithEmptyProject(@TempDir final Path output) throws IOException {
         new XslReport(
-            new Skeleton(new FakeBase()).xml(), new XslCalculus(), new ReportData("LCOM")
+            new Skeleton(new FakeBase()).xml(),
+            new XslCalculus("LCOM"),
+            new ReportData("LCOM")
         ).save(output);
         new Assertion<>(
             "Report for empty project created",
@@ -118,7 +122,7 @@ public void createsFullXmlReport(@TempDir final Path output) throws IOException
                         .add("class").attr("id", "D").attr("value", "0.7").up()
                         .add("class").attr("id", "E").attr("value", "NaN").up()
                 ).xmlQuietly()
-            ), new XslCalculus(), new ReportData("LCOM")
+            ), new XslCalculus("LCOM"), new ReportData("LCOM")
         ).save(output);
         new Assertion<>(
             "Must create full report",
@@ -140,7 +144,9 @@ public void createsFullXmlReport(@TempDir final Path output) throws IOException
     @Test
     public void setsCorrectSchemaLocation(@TempDir final Path output) throws IOException {
         new XslReport(
-            new Skeleton(new FakeBase()).xml(), new XslCalculus(), new ReportData("LCOM")
+            new Skeleton(new FakeBase()).xml(),
+            new XslCalculus("LCOM"),
+            new ReportData("LCOM")
         ).save(output);
         new Assertion<>(
             "Must have correct schema location",
diff --git a/src/test/java/org/jpeek/calculus/java/Lcom4Test.java b/src/test/java/org/jpeek/calculus/java/Lcom4Test.java
index 5cceb811..517ebce2 100644
--- a/src/test/java/org/jpeek/calculus/java/Lcom4Test.java
+++ b/src/test/java/org/jpeek/calculus/java/Lcom4Test.java
@@ -47,7 +47,7 @@ public final class Lcom4Test {
     @Disabled
     public void createsXmlCalculusWithXpaths() throws IOException {
         final XML result = new Lcom4().node(
-            "LCOM", new HashMap<>(0), new Skeleton(
+            new HashMap<>(0), new Skeleton(
                 new FakeBase(
                     "NoMethods", "Bar", "OverloadMethods",
                     "OnlyOneMethodWithParams", "WithoutAttributes"
@@ -70,7 +70,7 @@ public void createsXmlCalculusWithXpaths() throws IOException {
     @CsvFileSource(resources = "/org/jpeek/calculus/java/lcom4-params.csv")
     public void calculatesValue(final String file, final String value) throws Exception {
         final XML result = new Lcom4().node(
-            "", new HashMap<>(0), new Skeleton(
+            new HashMap<>(0), new Skeleton(
                 new FakeBase(file)
             ).xml()
         );
diff --git a/src/test/java/org/jpeek/calculus/xsl/XslCalculusTest.java b/src/test/java/org/jpeek/calculus/xsl/XslCalculusTest.java
index e39d8fdd..b128d316 100644
--- a/src/test/java/org/jpeek/calculus/xsl/XslCalculusTest.java
+++ b/src/test/java/org/jpeek/calculus/xsl/XslCalculusTest.java
@@ -40,8 +40,8 @@ public final class XslCalculusTest {
 
     @Test
     public void createsXmlCalculusWithXpaths() throws IOException {
-        final XML result = new XslCalculus().node(
-            "LCOM", new HashMap<>(0), new Skeleton(
+        final XML result = new XslCalculus("LCOM").node(
+            new HashMap<>(0), new Skeleton(
                 new FakeBase(
                     "NoMethods", "Bar", "OverloadMethods",
                     "OnlyOneMethodWithParams", "WithoutAttributes"
@@ -61,8 +61,8 @@ public void createsXmlCalculusWithXpaths() throws IOException {
 
     @Test
     public void createsXmlCalculusWithEmptyProject() throws IOException {
-        final XML result = new XslCalculus().node(
-            "LCOM2", new HashMap<>(0), new Skeleton(new FakeBase()).xml()
+        final XML result = new XslCalculus("LCOM2").node(
+            new HashMap<>(0), new Skeleton(new FakeBase()).xml()
         );
         new Assertion<>(
             "Report for empty project created",