feat: add VersionFileProjectType and register in ProjectTypeFactory (#124)

src/main/java/io/jenkins/plugins/conventionalcommits/utils/ProjectTypeFactory.java

@@ -3,6 +3,7 @@
 import java.io.File;
 import java.util.HashMap;
 import java.util.Map;
+import io.jenkins.plugins.conventionalcommits.utils.VersionFileProjectType;
 
 /** Factory class to support multiple project types. */
 public class ProjectTypeFactory {
@@ -18,6 +19,7 @@ public class ProjectTypeFactory {
     projectTypeMap.put("helm", new HelmProjectType());
     projectTypeMap.put("go", new GoProjectType());
     projectTypeMap.put("php", new PhpProjectType());
+            projectTypeMap.put("version", new VersionFileProjectType());
   }
 
   /**

src/main/java/io/jenkins/plugins/conventionalcommits/utils/VersionFileProjectType.java

@@ -0,0 +1,58 @@
+package io.jenkins.plugins.conventionalcommits.utils;
+
+import com.github.zafarkhaja.semver.Version;
+import io.jenkins.plugins.conventionalcommits.process.ProcessHelper;
+import java.io.File;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+
+/**
+ * ProjectType implementation that uses a simple VERSION file.
+ *
+ * This class detects a plain text file named VERSION (or a custom file
+ * name passed to the constructor) in the project root directory. The file
+ * must contain a single semantic version (e.g. "1.0.0"). When present,
+ * this ProjectType returns the current version from the file and writes
+ * the next version back to the same file after a bump.
+ */
+public class VersionFileProjectType extends ProjectType {
+
+    private final String versionFileName;
+
+    /** Creates a VersionFileProjectType that looks for a file named "VERSION". */
+    public VersionFileProjectType() {
+        this("VERSION");
+    }
+
+    /**
+     * Creates a VersionFileProjectType with a custom version file name.
+     *
+     * @param versionFileName name of the file containing the version string
+     */
+    public VersionFileProjectType(String versionFileName) {
+        this.versionFileName = versionFileName;
+    }
+
+    @Override
+    public boolean check(File directory) {
+        return new File(directory, versionFileName).exists();
+    }
+
+    @Override
+    public Version getCurrentVersion(File directory, ProcessHelper processHelper)
+            throws IOException, InterruptedException {
+        // Ignore the processHelper parameter as this project type does not need it
+        Path path = new File(directory, versionFileName).toPath();
+        String content = Files.readString(path).trim();
+        return Version.valueOf(content);
+    }
+
+    @Override
+    public void writeVersion(File directory, Version nextVersion, ProcessHelper processHelper)
+            throws IOException, InterruptedException {
+        // Ignore the processHelper parameter; simply write the version string
+        Path path = new File(directory, versionFileName).toPath();
+        Files.writeString(path, nextVersion.toString() + System.lineSeparator());
+    }
+}