import com.sun.xml.internal.bind.v2.schemagen.xmlschema.TypeHost; //导入依赖的package包/类
/**
 * Writes a type attribute (if the referenced type is a global type)
 * or writes out the definition of the anonymous type in place (if the referenced
 * type is not a global type.)
 *
 * Also provides processing for ID/IDREF, MTOM @xmime, and swa:ref
 *
 * ComplexTypeHost and SimpleTypeHost don't share an api for creating
 * and attribute in a type-safe way, so we will compromise for now and
 * use _attribute().
 */
private void writeTypeRef(TypeHost th, NonElementRef<T, C> typeRef, String refAttName) {
    // ID / IDREF handling
    switch(typeRef.getSource().id()) {
    case ID:
        th._attribute(refAttName, new QName(WellKnownNamespace.XML_SCHEMA, "ID"));
        return;
    case IDREF:
        th._attribute(refAttName, new QName(WellKnownNamespace.XML_SCHEMA, "IDREF"));
        return;
    case NONE:
        // no ID/IDREF, so continue on and generate the type
        break;
    default:
        throw new IllegalStateException();
    }

    // MTOM handling
    MimeType mimeType = typeRef.getSource().getExpectedMimeType();
    if( mimeType != null ) {
        th._attribute(new QName(WellKnownNamespace.XML_MIME_URI, "expectedContentTypes", "xmime"), mimeType.toString());
    }

    // ref:swaRef handling
    if(generateSwaRefAdapter(typeRef)) {
        th._attribute(refAttName, new QName(WellKnownNamespace.SWA_URI, "swaRef", "ref"));
        return;
    }

    // type name override
    if(typeRef.getSource().getSchemaType()!=null) {
        th._attribute(refAttName,typeRef.getSource().getSchemaType());
        return;
    }

    // normal type generation
    writeTypeRef(th, typeRef.getTarget(), refAttName);
}