Move OpenRewriteTestSupport to test-helper

Author: fabapp2

components/test-helper/src/main/java/org/springframework/sbm/java/util/JavaSourceUtil.java

@@ -0,0 +1,50 @@
+/*
+ * Copyright 2021 - 2023 the original author or 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
+ *
+ *      https://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.springframework.sbm.java.util;
+
+import java.io.File;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+public class JavaSourceUtil {
+
+    public static final Pattern PACKAGE_PATTERN = Pattern.compile("package ([\\w\\d\\.]*);");
+    public static final Pattern CLASS_PATTERN = Pattern.compile("(class|interface|enum)\\s([\\w]+).*");
+
+    public static String retrieveFullyQualifiedClassFileName(String code) {
+        Matcher classMatcher = CLASS_PATTERN.matcher(code);
+
+        String packageName = retrievePackageName(code);
+
+        if (!classMatcher.find()) throw new RuntimeException("Could not extract classname from code '" + code + "'.");
+        String className = classMatcher.group(2);
+        if (packageName.isEmpty()) {
+            return className + ".java";
+        } else {
+            return packageName.replace(".", File.separator) + File.separator + className + ".java";
+        }
+
+    }
+
+    public static String retrievePackageName(String js) {
+        Matcher packageMatcher = PACKAGE_PATTERN.matcher(js);
+        String packageName = "";
+        if (packageMatcher.find()) {
+            packageName = packageMatcher.group(1);
+        }
+        return packageName;
+    }
+}