protected void populateArtifactMapFromStream()

in jbatch/src/main/java/org/apache/batchee/container/services/factory/DefaultBatchArtifactFactory.java [119:187]
40 lines of code
9 McCabe index (conditional complexity)

    protected void populateArtifactMapFromStream(final ArtifactMap tempMap, final InputStream is) {
        final XMLInputFactory xmlInputFactory = XMLInputFactory.newInstance();
        try {
            final XMLStreamReader xmlStreamReader = xmlInputFactory.createXMLStreamReader(is);

            boolean processedRoot = false;

            // We are going to take advantage of the simplified structure of a
            // line
            // E.g.:
            // <batch-artifacts>
            //   <item-processor id=MyItemProcessor class=jsr352/sample/MyItemProcessorImpl/>
            //   ..
            // </batch-artifacts>
            //
            // and have much simpler logic than general-purpose parsing would
            // require.
            while (xmlStreamReader.hasNext()) {
                int event = xmlStreamReader.next();

                // Until we reach end of document
                if (event == END_DOCUMENT) {
                    break;
                }

                // At this point we have either:
                //    A) just passed START_DOCUMENT, and are at START_ELEMENT for the root,
                //       <batch-artifacts>, or
                //    B) we have just passed END_ELEMENT for one of the artifacts which is a child of
                //       <batch-artifacts>.
                //
                //  Only handle START_ELEMENT now so we can skip whitespace CHARACTERS events.
                //
                if (event == START_ELEMENT) {
                    if (!processedRoot) {
                        QName rootQName = xmlStreamReader.getName();
                        if (!rootQName.equals(BATCH_ROOT_ELEM)) {
                            throw new IllegalStateException("Expecting document with root element QName: " + BATCH_ROOT_ELEM
                                + ", but found root element with QName: " + rootQName);
                        } else {
                            processedRoot = true;
                        }
                    } else {

                        // Should only need localName
                        final String annotationShortName = xmlStreamReader.getLocalName();
                        final String id = xmlStreamReader.getAttributeValue(null, "id");
                        final String className = xmlStreamReader.getAttributeValue(null, "class");
                        tempMap.addEntry(annotationShortName, id, className);

                        // Ignore anything else (text/whitespace) within this
                        // element
                        while (event != END_ELEMENT) {
                            event = xmlStreamReader.next();
                        }
                    }
                }
            }
            xmlStreamReader.close();
        } catch (final Exception e) {
            throw new RuntimeException(e);
        } finally {
            try {
                is.close();
            } catch (final IOException e) {
                // no-op
            }
        }
    }