import com.sun.corba.se.impl.orbutil.RepositoryIdUtility; //导入依赖的package包/类
/**
 * Examines the valuetag to see how many (if any) repository IDs
 * are present on the wire.  If no repository ID information
 * is on the wire but the expectedType or expectedTypeRepId
 * is known, it will return one of those (favoring the
 * expectedType's repId). Failing that, it uses the supplied
 * BoxedValueHelper to obtain the repository ID, as a last resort.
 */
private String readRepositoryIds(int valueTag,
                                 Class expectedType,
                                 String expectedTypeRepId,
                                 BoxedValueHelper factory) {
    switch(repIdUtil.getTypeInfo(valueTag)) {
        case RepositoryIdUtility.NO_TYPE_INFO :
            // Throw an exception if we have no repository ID info and
            // no expectedType to work with.  Otherwise, how would we
            // know what to unmarshal?
            if (expectedType == null) {
                if (expectedTypeRepId != null) {
                    return expectedTypeRepId;
                } else if (factory != null) {
                    return factory.get_id();
                } else {
                    throw wrapper.expectedTypeNullAndNoRepId(
                        CompletionStatus.COMPLETED_MAYBE);
                }
            }
            return repIdStrs.createForAnyType(expectedType);
        case RepositoryIdUtility.SINGLE_REP_TYPE_INFO :
            return read_repositoryId();
        case RepositoryIdUtility.PARTIAL_LIST_TYPE_INFO :
            return read_repositoryIds();
        default:
            throw wrapper.badValueTag( CompletionStatus.COMPLETED_MAYBE,
                Integer.toHexString(valueTag) ) ;
    }
}
 

import com.sun.corba.se.impl.orbutil.RepositoryIdUtility; //导入依赖的package包/类
public void start_value() {
    // Read value tag
    int vType = readValueTag();

    if (vType == 0) {
        // Stream needs to go into a state where it
        // throws standard exception until end_value
        // is called.  This means the sender didn't
        // send any custom data.  If the reader here
        // tries to read more, we need to throw an
        // exception before reading beyond where
        // we're supposed to
        specialNoOptionalDataState = true;

        return;
    }

    if (vType == 0xffffffff) {
        // One should never indirect to a custom wrapper
        throw wrapper.customWrapperIndirection(
            CompletionStatus.COMPLETED_MAYBE);
    }

    if (repIdUtil.isCodeBasePresent(vType)) {
        throw wrapper.customWrapperWithCodebase(
            CompletionStatus.COMPLETED_MAYBE);
    }

    if (repIdUtil.getTypeInfo(vType)
        != RepositoryIdUtility.SINGLE_REP_TYPE_INFO) {
        throw wrapper.customWrapperNotSingleRepid(
            CompletionStatus.COMPLETED_MAYBE);
    }


    // REVISIT - Could verify repository ID even though
    // it isn't used elsewhere
    read_repositoryId();

    // Note: isChunked should be true here.  Should have
    // been set to true in the containing value's read_value
    // method.

    start_block();
    end_flag--;
    chunkedValueNestingLevel--;
}