Allow configuring persistent index format version in the Maven plugin

maven-plugin/src/it/indexVersion/pom.xml

@@ -0,0 +1,45 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+ xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+ <modelVersion>4.0.0</modelVersion>
+
+ <groupId>org.jboss.jandex</groupId>
+ <artifactId>jandex-maven-plugin-indexVersion</artifactId>
+ <version>1.0-SNAPSHOT</version>
+
+ <properties>
+ <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+ <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
+
+ <maven.compiler.source>1.8</maven.compiler.source>
+ <maven.compiler.target>1.8</maven.compiler.target>
+ </properties>
+
+ <build>
+ <plugins>
+ <plugin>
+ <groupId>org.apache.maven.plugins</groupId>
+ <artifactId>maven-compiler-plugin</artifactId>
+ <version>@version.maven-compiler-plugin@</version>
+ </plugin>
+
+ <plugin>
+ <groupId>@project.groupId@</groupId>
+ <artifactId>@project.artifactId@</artifactId>
+ <version>@project.version@</version>
+ <executions>
+ <execution>
+ <id>make-index</id>
+ <goals>
+ <goal>jandex</goal>
+ </goals>
+ <configuration>
+ <!-- oldest version of V2 index -->
+ <indexVersion>6</indexVersion>
+ </configuration>
+ </execution>
+ </executions>
+ </plugin>
+ </plugins>
+ </build>
+</project>

maven-plugin/src/it/indexVersion/src/main/java/org/jboss/jandex/maven/indexVersion/SomeClass.java

@@ -0,0 +1,4 @@
+package org.jboss.jandex.maven.indexVersion;
+
+public class SomeClass {
+}

maven-plugin/src/it/indexVersion/verify.groovy

@@ -0,0 +1,13 @@
+import org.jboss.jandex.IndexReader
+import org.jboss.jandex.PackedDataInputStream
+
+def jandexFile = new File(basedir, 'target/classes/META-INF/jandex.idx')
+assert jandexFile.exists() : "File ${jandexFile} does not exist"
+assert jandexFile.length() > 0 : "File ${jandexFile} is empty"
+
+def data = new PackedDataInputStream(jandexFile.newInputStream())
+assert data.readInt() == 0xBABE1F15 as int // magic
+assert data.readUnsignedByte() == 6 // version
+
+def index = new IndexReader(jandexFile.newInputStream()).read()
+assert index.getKnownClasses().size() == 1 : "Index ${jandexFile} does not contain exactly 1 class"

maven-plugin/src/it/smoketest/pom.xml

@@ -42,4 +42,4 @@
  </plugin>
  </plugins>
  </build>
-</project>
+</project>

maven-plugin/src/main/java/org/jboss/jandex/maven/JandexGoal.java

@@ -113,6 +113,12 @@ public class JandexGoal extends AbstractMojo {
  @Parameter(defaultValue = "jandex.idx")
  private String indexName;
 
+ /**
+ * Persistent index format version to write. Defaults to max supported version.
+ */
+ @Parameter
+ private Integer indexVersion;
+
  /**
  * Skip execution if set.
  */
@@ -169,7 +175,11 @@ public void execute() throws MojoExecutionException {
  Files.createDirectories(indexDir.toPath());
  try (OutputStream out = new CachingOutputStream(indexFile)) {
  IndexWriter writer = new IndexWriter(out);
- writer.write(index);
+ if (indexVersion != null) {
+ writer.write(index, indexVersion);
+ } else {
+ writer.write(index);
+ }
  }
  } catch (IOException e) {
  throw new MojoExecutionException("Could not save index " + indexFile, e);