Preprocessing source code as a part of a maven build

<build>
  <plugins>
    <plugin>
      <groupId>org.apache.maven.plugins</groupId>
      <artifactId>maven-antrun-plugin</artifactId>
      <executions>
        <execution>
          <id>process-sources</id>
          <phase>process-sources</phase>
          <configuration>
            <tasks>
               <!-- Put the code to run the program here -->
            </tasks>
          </configuration>
          <goals>
            <goal>run</goal>
          </goals>
        </execution>
      </executions>
    </plugin>
  </plugins>
</build>