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

Author: Anmol202005

config/import-control.xml

@@ -11,4 +11,5 @@
     <allow pkg="javax.xml.stream"/>
     <allow pkg="org.checkstyle"/>
     <allow pkg="java.util"/>
+    <allow pkg="com.puppycrawl.tools.checkstyle"/>
 </import-control>

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

@@ -17,14 +17,24 @@
 
 package org.checkstyle.autofix;
 
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+import java.io.IOException;
 import java.nio.file.Path;
 import java.util.List;
+import java.util.Properties;
 
 import org.checkstyle.autofix.parser.CheckstyleReportParser;
 import org.checkstyle.autofix.parser.CheckstyleViolation;
+import org.checkstyle.autofix.parser.ConfigConfiguration;
+import org.checkstyle.autofix.parser.ConfigurationMapper;
 import org.openrewrite.Option;
 import org.openrewrite.Recipe;
 
+import com.puppycrawl.tools.checkstyle.ConfigurationLoader;
+import com.puppycrawl.tools.checkstyle.PropertiesExpander;
+import com.puppycrawl.tools.checkstyle.api.CheckstyleException;
+
 /**
  * Main recipe that automatically fixes all supported Checkstyle violations.
  */
@@ -35,6 +45,17 @@ 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 checkstyleConfigurationPath;
+
+    @Option(displayName = "Checkstyle properties file path",
+            description = "Path to the file containing the Checkstyle Properties.",
+            example = "config/checkstyle.properties",
+            required = false)
+    private String propertiesPath;
+
     @Override
     public String getDisplayName() {
         return "Checkstyle autoFix";
@@ -49,12 +70,39 @@ public String getViolationReportPath() {
         return violationReportPath;
     }
 
+    public String getCheckstyleConfigurationPath() {
+        return checkstyleConfigurationPath;
+    }
+
+    public String getPropertiesPath() {
+        return propertiesPath;
+    }
+
     @Override
     public List<Recipe> getRecipeList() {
-
         final List<CheckstyleViolation> violations = CheckstyleReportParser
                 .parse(Path.of(getViolationReportPath()));
 
         return CheckstyleRecipeRegistry.getRecipes(violations);
     }
+
+    private ConfigConfiguration loadCheckstyleConfiguration()
+            throws CheckstyleException, IOException {
+        Properties props = new Properties();
+        final String propFile = getPropertiesPath();
+
+        if (propFile == null) {
+            props = System.getProperties();
+        }
+        else {
+            try (FileInputStream input = new FileInputStream(propFile)) {
+                props.load(input);
+            }
+            catch (FileNotFoundException exception) {
+                throw new IllegalArgumentException("Failed to read: " + propFile, exception);
+            }
+        }
+        return ConfigurationMapper.mapConfiguration(ConfigurationLoader.loadConfiguration(
+                getCheckstyleConfigurationPath(), new PropertiesExpander(props)));
+    }
 }

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

@@ -0,0 +1,39 @@
+///////////////////////////////////////////////////////////////////////////////////////////////
+// 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.Map;
+
+public final class ConfigConfiguration {
+    private final Map<String, String> properties;
+    private final ConfigConfiguration[] children;
+
+    public ConfigConfiguration(Map<String, String> properties, ConfigConfiguration[] children) {
+        this.properties = properties;
+        this.children = children;
+    }
+
+    public Map<String, String> getProperties() {
+        return properties;
+    }
+
+    public ConfigConfiguration[] getChildren() {
+        return children;
+    }
+
+}

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

@@ -0,0 +1,56 @@
+///////////////////////////////////////////////////////////////////////////////////////////////
+// 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.Map;
+
+import com.puppycrawl.tools.checkstyle.api.CheckstyleException;
+import com.puppycrawl.tools.checkstyle.api.Configuration;
+
+public final class ConfigurationMapper {
+
+    private ConfigurationMapper() {
+        // utility class
+    }
+
+    public static ConfigConfiguration 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 IllegalArgumentException("Error getting property "
+                        + propertyName + ": " + exception.getMessage());
+            }
+        }
+
+        final Configuration[] checkstyleChildren = config.getChildren();
+        final ConfigConfiguration[] simpleChildren =
+                new ConfigConfiguration[checkstyleChildren.length];
+        for (int index = 0; index < checkstyleChildren.length; index++) {
+            simpleChildren[index] = mapConfiguration(checkstyleChildren[index]);
+        }
+
+        return new ConfigConfiguration(properties, simpleChildren);
+    }
+}

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

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