@Override
    public FileObject getFileForInput(JavaFileManager.Location location, String packageName,
            String relativeName) throws IOException {
        throw new UnsupportedOperationException();
    }
MemFileManager is a memory based implementation of the JavaFileManager
interface

@author tiwe
querydsl-codegen-utils/src/main/java/com/querydsl/codegen/utils/MemFileManager.java