Issue #36: Updated CheckstyleAutoFix to load checkstyle-config.

src/main/java/org/checkstyle/autofix/CheckstyleAutoFix.java

@@ -20,8 +20,10 @@
 import java.nio.file.Path;
 import java.util.List;
 
+import org.checkstyle.autofix.parser.CheckConfiguration;
 import org.checkstyle.autofix.parser.CheckstyleReportParser;
 import org.checkstyle.autofix.parser.CheckstyleViolation;
+import org.checkstyle.autofix.parser.ConfigurationLoader;
 import org.openrewrite.Option;
 import org.openrewrite.Recipe;
 
@@ -35,6 +37,11 @@ public class CheckstyleAutoFix extends Recipe {
             example = "target/checkstyle/checkstyle-report.xml")
     private String violationReportPath;
 
+    @Option(displayName = "Checkstyle config path",
+            description = "Path to the file containing Checkstyle configuration.",
+            example = "config/checkstyle.xml")
+    private String configurationPath;
+
     @Override
     public String getDisplayName() {
         return "Checkstyle autoFix";
@@ -49,12 +56,19 @@ public String getViolationReportPath() {
         return violationReportPath;
     }
 
+    public String getConfigurationPath() {
+        return configurationPath;
+    }
+
     @Override
     public List<Recipe> getRecipeList() {
-
         final List<CheckstyleViolation> violations = CheckstyleReportParser
                 .parse(Path.of(getViolationReportPath()));
 
         return CheckstyleRecipeRegistry.getRecipes(violations);
     }
+
+    private CheckConfiguration loadCheckstyleConfiguration() {
+        return ConfigurationLoader.loadConfiguration(getConfigurationPath());
+    }
 }

src/main/java/org/checkstyle/autofix/parser/CheckConfiguration.java

@@ -0,0 +1,91 @@
+///////////////////////////////////////////////////////////////////////////////////////////////
+// checkstyle-openrewrite-recipes: Automatically fix Checkstyle violations with OpenRewrite.
+// Copyright (C) 2025 The Checkstyle OpenRewrite Recipes Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+///////////////////////////////////////////////////////////////////////////////////////////////
+
+package org.checkstyle.autofix.parser;
+
+import java.util.List;
+import java.util.Map;
+
+public final class CheckConfiguration {
+    private final String name;
+    private final Map<String, String> properties;
+    private final List<CheckConfiguration> children;
+    private CheckConfiguration parent;
+
+    public CheckConfiguration(String name,
+                              Map<String, String> properties, List<CheckConfiguration> children) {
+        this.name = name;
+        this.properties = properties;
+        this.children = children;
+
+        for (CheckConfiguration child : children) {
+            child.setParent(this);
+        }
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public Map<String, String> getProperties() {
+        return properties;
+    }
+
+    public List<CheckConfiguration> getChildren() {
+        return children;
+    }
+
+    public String getProperty(String key) {
+        return properties.get(key);
+    }
+
+    public int[] getIntArray(String propertyName) {
+        final String value = properties.get(propertyName);
+        final int[] result;
+        final String[] parts = value.split(",");
+        result = new int[parts.length];
+        for (int index = 0; index < parts.length; index++) {
+            try {
+                result[index] = Integer.parseInt(parts[index].trim());
+            }
+            catch (NumberFormatException exception) {
+                throw new IllegalArgumentException("Property '" + propertyName
+                        + "' has an invalid integer value: " + parts[index].trim(), exception);
+            }
+        }
+        return result;
+    }
+
+    public CheckConfiguration getChild(String childName) {
+        CheckConfiguration result = null;
+        for (CheckConfiguration child : children) {
+            if (childName.equals(child.getName())) {
+                result = child;
+                break;
+            }
+        }
+        return result;
+    }
+
+    public CheckConfiguration getParent() {
+        return parent;
+    }
+
+    private void setParent(CheckConfiguration parent) {
+        this.parent = parent;
+    }
+}

src/main/java/org/checkstyle/autofix/parser/ConfigurationLoader.java

@@ -0,0 +1,76 @@
+///////////////////////////////////////////////////////////////////////////////////////////////
+// checkstyle-openrewrite-recipes: Automatically fix Checkstyle violations with OpenRewrite.
+// Copyright (C) 2025 The Checkstyle OpenRewrite Recipes Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+///////////////////////////////////////////////////////////////////////////////////////////////
+
+package org.checkstyle.autofix.parser;
+
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Properties;
+
+import com.puppycrawl.tools.checkstyle.PropertiesExpander;
+import com.puppycrawl.tools.checkstyle.api.CheckstyleException;
+import com.puppycrawl.tools.checkstyle.api.Configuration;
+
+public final class ConfigurationLoader {
+
+    private ConfigurationLoader() {
+        // utility class
+    }
+
+    private static CheckConfiguration mapConfiguration(Configuration config) {
+        final Map<String, String> properties = new HashMap<>();
+        final String[] propertyNames = config.getPropertyNames();
+        for (String propertyName : propertyNames) {
+            try {
+                final String value = config.getProperty(propertyName);
+                properties.put(propertyName, value);
+
+            }
+            catch (CheckstyleException exception) {
+                throw new IllegalStateException("Error getting property " + propertyName,
+                        exception);
+            }
+        }
+
+        final Configuration[] checkstyleChildren = config.getChildren();
+        final CheckConfiguration[] simpleChildren =
+                new CheckConfiguration[checkstyleChildren.length];
+        for (int index = 0; index < checkstyleChildren.length; index++) {
+            simpleChildren[index] = mapConfiguration(checkstyleChildren[index]);
+        }
+
+        return new CheckConfiguration(config.getName(), properties, List.of(simpleChildren));
+    }
+
+    public static CheckConfiguration loadConfiguration(String checkstyleConfigurationPath) {
+
+        final Configuration checkstyleConfig;
+        try {
+            checkstyleConfig = com.puppycrawl.tools.checkstyle.ConfigurationLoader
+                    .loadConfiguration(checkstyleConfigurationPath,
+                            new PropertiesExpander(new Properties()));
+        }
+        catch (CheckstyleException exception) {
+            throw new IllegalStateException("Failed to load configuration:"
+                    + checkstyleConfigurationPath, exception);
+        }
+
+        return mapConfiguration(checkstyleConfig);
+    }
+
+}

src/main/resources/META-INF/rewrite/recipes.yml

@@ -15,3 +15,4 @@ tags:
 recipeList:
   - org.checkstyle.autofix.CheckstyleAutoFix:
       violationReportPath: "target/checkstyle/checkstyle-report.xml"
+      configurationPath: "https://raw.githubusercontent.com/checkstyle/checkstyle/checkstyle-${checkstyle.version}/config/checkstyle-checks.xml"