private void parseContent()

in apm-agent-plugins/apm-profiling-plugin/src/main/java/co/elastic/apm/agent/profiler/asyncprofiler/JfrParser.java [155:253]
88 lines of code
19 McCabe index (conditional complexity)

    private void parseContent() throws IOException {
        BufferedFile bufferedFile = this.bufferedFile;
        int contentTypeId = bufferedFile.getInt();
        logger.debug("Parsing content type {}", contentTypeId);
        int count = bufferedFile.getInt();
        switch (contentTypeId) {
            case ContentTypeId.CONTENT_THREAD:
                for (int i = 0; i < count; i++) {
                    int threadId = bufferedFile.getInt();
                    String threadName = readUtf8String().toString();
                }
                break;
            case ContentTypeId.CONTENT_JAVA_THREAD:
                for (int i = 0; i < count; i++) {
                    bufferedFile.ensureRemaining(16);
                    long javaThreadId = bufferedFile.getUnsafeLong();
                    int nativeThreadId = bufferedFile.getUnsafeInt();
                    int threadGroup = bufferedFile.getUnsafeInt();
                    nativeTidToJavaTid.put(nativeThreadId, javaThreadId);
                }
                break;
            case ContentTypeId.CONTENT_THREAD_GROUP:
                // no info
                break;
            case ContentTypeId.CONTENT_STACKTRACE:
                for (int i = 0; i < count; i++) {
                    bufferedFile.ensureRemaining(13);
                    int pos = (int) bufferedFile.position();
                    // always an integer
                    // see profiler.h
                    // MAX_CALLTRACES = 65536
                    int stackTraceKey = (int) bufferedFile.getUnsafeLong();
                    this.stackTraceIdToFilePositions.put(stackTraceKey, pos);
                    bufferedFile.getUnsafe(); // truncated
                    int numFrames = bufferedFile.getUnsafeInt();
                    int sizeOfFrame = 13;
                    bufferedFile.skip(numFrames * sizeOfFrame);
                }
                break;
            case ContentTypeId.CONTENT_CLASS:
                for (int i = 0; i < count; i++) {
                    bufferedFile.ensureRemaining(26);
                    // classId is an incrementing integer, no way there are more than 2 billion distinct ones
                    int classId = (int) bufferedFile.getUnsafeLong();
                    bufferedFile.getUnsafeLong(); // loader class
                    // symbol ids are incrementing integers, no way there are more than 2 billion distinct ones
                    int classNameSymbolId = (int) bufferedFile.getUnsafeLong();
                    classIdToClassNameSymbolId.put(classId, classNameSymbolId); // class name
                    bufferedFile.getUnsafeShort(); // access flags
                }
                break;
            case ContentTypeId.CONTENT_METHOD:
                for (int i = 1; i <= count; i++) {
                    bufferedFile.ensureRemaining(35);
                    long id = bufferedFile.getUnsafeLong();
                    // classId is an incrementing integer, no way there are more than 2 billion distinct ones
                    int classId = (int) bufferedFile.getUnsafeLong();
                    // symbol ids are incrementing integers, no way there are more than 2 billion distinct ones
                    int methodNameSymbolId = (int) bufferedFile.getUnsafeLong();
                    frameIdToFrame.put(id, FRAME_NULL);
                    frameIdToClassId.put(id, classId);
                    frameIdToMethodSymbol.put(id, methodNameSymbolId);
                    bufferedFile.getUnsafeLong(); // signature
                    bufferedFile.getUnsafeShort(); // modifiers
                    bufferedFile.getUnsafe(); // hidden
                }
                break;
            case ContentTypeId.CONTENT_SYMBOL:
                for (int i = 0; i < count; i++) {
                    // symbol ids are incrementing integers, no way there are more than 2 billion distinct ones
                    int symbolId = (int) bufferedFile.getLong();
                    int pos = (int) bufferedFile.position();
                    symbolIdToPos.put(symbolId, pos);
                    symbolIdToString.put(symbolId, SYMBOL_NULL);
                    skipString();
                }
                break;
            case ContentTypeId.CONTENT_STATE:
                // we're not really interested in the thread states
                // but we sill have to consume the bytes
                for (int i = 1; i <= count; i++) {
                    bufferedFile.getShort();
                    skipString();
                }
                break;
            case ContentTypeId.CONTENT_FRAME_TYPE:
                isJavaFrameType = new boolean[count + 1];
                for (int i = 1; i <= count; i++) {
                    int id = bufferedFile.get();
                    if (i != id) {
                        throw new IllegalStateException("Expecting ids to be incrementing");
                    }
                    isJavaFrameType[id] = JAVA_FRAME_TYPES.contains(readUtf8String().toString());
                }
                break;
            default:
                throw new IOException("Unknown content type " + contentTypeId);
        }
    }