private void collectInlineKnuthElements()

in fop-core/src/main/java/org/apache/fop/layoutmgr/inline/LineLayoutManager.java [698:816]
89 lines of code
26 McCabe index (conditional complexity)

    private void collectInlineKnuthElements(LayoutContext context) {
        LayoutContext inlineLC = LayoutContext.copyOf(context);

        // convert all the text in a sequence of paragraphs made
        // of KnuthBox, KnuthGlue and KnuthPenalty objects
        boolean previousIsBox = false;

        StringBuffer trace = new StringBuffer("LineLM:");

        Paragraph lastPar = null;

        InlineLevelLayoutManager curLM;
        while ((curLM = (InlineLevelLayoutManager) getChildLM()) != null) {
            List<KnuthSequence> inlineElements = curLM.getNextKnuthElements(inlineLC, effectiveAlignment);
            if (inlineElements == null || inlineElements.size() == 0) {
                /* curLM.getNextKnuthElements() returned null or an empty list;
                 * this can happen if there is nothing more to layout,
                 * so just iterate once more to see if there are other children */
                continue;
            }

            if (lastPar != null) {
                KnuthSequence firstSeq = inlineElements.get(0);

                // finish last paragraph before a new block sequence
                if (!firstSeq.isInlineSequence()) {
                    lastPar.endParagraph();
                    ElementListObserver.observe(lastPar, "line", null);
                    lastPar = null;
                    if (log.isTraceEnabled()) {
                        trace.append(" ]");
                    }
                    previousIsBox = false;
                }

                // does the first element of the first paragraph add to an existing word?
                if (lastPar != null) {
                    KnuthElement thisElement;
                    thisElement = (KnuthElement) firstSeq.get(0);
                    if (thisElement.isBox() && !thisElement.isAuxiliary()
                            && previousIsBox) {
                        lastPar.addALetterSpace();
                    }
                }
            }

            // loop over the KnuthSequences (and single KnuthElements) in returnedList
            for (Object inlineElement : inlineElements) {
                KnuthSequence sequence = (KnuthSequence) inlineElement;
                // the sequence contains inline Knuth elements
                if (sequence.isInlineSequence()) {
                    // look at the last element
                    ListElement lastElement = sequence.getLast();
                    assert lastElement != null;
                    previousIsBox = lastElement.isBox()
                            && !((KnuthElement) lastElement).isAuxiliary()
                            && ((KnuthElement) lastElement).getWidth() != 0;

                    // if last paragraph is open, add the new elements to the paragraph
                    // else this is the last paragraph
                    if (lastPar == null) {
                        lastPar = new Paragraph(this,
                                textAlignment, textAlignmentLast,
                                textIndent.getValue(this),
                                lastLineEndIndent.getValue(this));
                        lastPar.startSequence();
                        if (log.isTraceEnabled()) {
                            trace.append(" [");
                        }
                    } else {
                        if (log.isTraceEnabled()) {
                            trace.append(" +");
                        }
                    }
                    lastPar.addAll(sequence);
                    if (log.isTraceEnabled()) {
                        trace.append(" I");
                    }

                    // finish last paragraph if it was closed with a linefeed
                    if (lastElement.isPenalty()
                            && ((KnuthPenalty) lastElement).getPenalty()
                            == -KnuthPenalty.INFINITE) {
                        // a penalty item whose value is -inf
                        // represents a preserved linefeed,
                        // which forces a line break
                        lastPar.removeLast();
                        if (!lastPar.containsBox()) {
                            //only a forced linefeed on this line
                            //-> compensate with an auxiliary glue
                            lastPar.add(new KnuthGlue(ipd, 0, ipd, null, true));
                        }
                        lastPar.endParagraph();
                        ElementListObserver.observe(lastPar, "line", null);
                        lastPar = null;
                        if (log.isTraceEnabled()) {
                            trace.append(" ]");
                        }
                        previousIsBox = false;
                    }
                } else { // the sequence is a block sequence
                    // the positions will be wrapped with this LM in postProcessLineBreaks
                    knuthParagraphs.add(sequence);
                    if (log.isTraceEnabled()) {
                        trace.append(" B");
                    }
                }
            } // end of loop over returnedList
        }

        if (lastPar != null) {
            lastPar.endParagraph();
            ElementListObserver.observe(lastPar, "line", fobj.getId());
            if (log.isTraceEnabled()) {
                trace.append(" ]");
            }
        }
        log.trace(trace);
    }