Examples of org.apache.fop.layoutmgr.KnuthElement

org.apache.fop.layoutmgr.KnuthElement
This is the super class for KnuthBox, KnuthGlue and KnuthPenalty. It stores information common to all sub classes, and the methods to get it: the width, a Position and a boolean marking KnuthElements used for some special feature (for example, the additional elements used to represent a space when text alignment is right, left or center).

        stackSize = 0;


        List contentList = getNextKnuthElements(childLC, Constants.EN_START);
        ListIterator contentIter = contentList.listIterator();
        while (contentIter.hasNext()) {
            KnuthElement element = (KnuthElement) contentIter.next();
            if (element instanceof KnuthInlineBox) {
                KnuthInlineBox box = (KnuthInlineBox) element;
                // TODO handle alignment here?
            }
        }

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            // get KnuthElements from childLM
            returnedList = childLM.getNextKnuthElements(context, alignment);


            if (returnedList != null) {
                // move elements to contentList, and accumulate their size
               KnuthElement contentElement;
               while (returnedList.size() > 0) {
                    Object obj = returnedList.remove(0);
                    if (obj instanceof KnuthSequence) {
                        KnuthSequence ks = (KnuthSequence)obj;
                        for (Iterator it = ks.iterator(); it.hasNext();) {
                            contentElement = (KnuthElement)it.next();
                            stackSize += contentElement.getWidth();
                            contentList.add(contentElement);
                        }
                    } else {
                        contentElement = (KnuthElement)obj;
                        stackSize += contentElement.getWidth();
                        contentList.add(contentElement);
                    }
                }
            }
        }

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                nextIsBox = ((KnuthElement) iter.next()).isBox();
            }
            int len = 0;
            if (((KnuthElement) iter.previous()).isBox()) {
                while (iter.nextIndex() < endIndex) {
                    KnuthElement el = (KnuthElement) iter.next();
                    if (el.isBox() || el.isGlue()) {
                        len += el.getWidth();
                    }
                }
                len += ActiveCell.getElementContentLength((KnuthElement) iter.next());
            }
            return len;

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                    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();
                    }
                }
            }

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                    // create a list of the FootnoteBodyLM handling footnotes
                    // whose citations are in this line
                    List<LayoutManager> footnoteList = new LinkedList<LayoutManager>();
                    ListIterator<KnuthElement> elementIterator = seq.listIterator(startIndex);
                    while (elementIterator.nextIndex() <= endIndex) {
                        KnuthElement element = elementIterator.next();
                        if (element instanceof KnuthInlineBox
                                && ((KnuthInlineBox) element).isAnchor()) {
                            footnoteList.add(((KnuthInlineBox) element).getFootnoteBodyLM());
                        } else if (element instanceof KnuthBlockBox) {
                            footnoteList.addAll(((KnuthBlockBox) element).getFootnoteBodyLMs());

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    private void findHyphenationPoints(Paragraph currPar) {
        // hyphenate every word
        ListIterator currParIterator = currPar.listIterator(currPar.ignoreAtStart);
        // list of TLM involved in hyphenation
        List updateList = new LinkedList();
        KnuthElement firstElement;
        KnuthElement nextElement;
        // current InlineLevelLayoutManager
        InlineLevelLayoutManager currLM = null;
        // number of KnuthBox elements containing word fragments
        int boxCount;
        // number of auxiliary KnuthElements between KnuthBoxes
        int auxCount;
        StringBuffer sbChars;


        // find all hyphenation points
        while (currParIterator.hasNext()) {
            firstElement = (KnuthElement) currParIterator.next();
            //
            if (firstElement.getLayoutManager() != currLM) {
                currLM = (InlineLevelLayoutManager) firstElement.getLayoutManager();
                if (currLM != null) {
                    updateList.add(new Update(currLM, currParIterator.previousIndex()));
                } else {
                    break;
                }
            } else if (currLM == null) {
                break;
            }


            // collect word fragments, ignoring auxiliary elements;
            // each word fragment was created by a different TextLM
            if (firstElement.isBox() && !firstElement.isAuxiliary()) {
                boxCount = 1;
                auxCount = 0;
                sbChars = new StringBuffer();
                sbChars.append(currLM.getWordChars(firstElement.getPosition()));
                // look if next elements are boxes too
                while (currParIterator.hasNext()) {
                    nextElement = (KnuthElement) currParIterator.next();
                    if (nextElement.isBox() && !nextElement.isAuxiliary()) {
                        // a non-auxiliary KnuthBox: append word chars
                        if (currLM != nextElement.getLayoutManager()) {
                            currLM = (InlineLevelLayoutManager) nextElement.getLayoutManager();
                            updateList.add(new Update(currLM, currParIterator.previousIndex()));
                        }
                        // append text to recreate the whole word
                        boxCount++;
                        sbChars.append(currLM.getWordChars(nextElement.getPosition()));
                    } else if (!nextElement.isAuxiliary()) {
                        // a non-auxiliary non-box KnuthElement: stop
                        // go back to the last box or auxiliary element
                        currParIterator.previous();
                        break;
                    } else {
                        if (currLM != nextElement.getLayoutManager()) {
                            currLM = (InlineLevelLayoutManager) nextElement.getLayoutManager();
                            updateList.add(new Update(currLM, currParIterator.previousIndex()));
                        }
                        // an auxiliary KnuthElement: simply ignore it
                        auxCount++;
                    }
                }
                if (log.isTraceEnabled()) {
                    log.trace(" Word to hyphenate: " + sbChars.toString());
                }
                // find hyphenation points
                HyphContext hc = getHyphenContext(sbChars);
                // ask each LM to hyphenate its word fragment
                if (hc != null) {
                    KnuthElement element = null;
                    for (int i = 0; i < (boxCount + auxCount); i++) {
                        currParIterator.previous();
                    }
                    for (int i = 0; i < (boxCount + auxCount); i++) {
                        element = (KnuthElement) currParIterator.next();
                        if (element.isBox() && !element.isAuxiliary()) {
                            ((InlineLevelLayoutManager)
                             element.getLayoutManager()).hyphenate(element.getPosition(), hc);
                        } else {
                            // nothing to do, element is an auxiliary KnuthElement
                        }
                    }
                }

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            }
        }


        // ignore the last element in the line if it is a KnuthGlue object
        ListIterator seqIterator = seq.listIterator(endElementIndex);
        KnuthElement lastElement = (KnuthElement) seqIterator.next();
        // the TLM which created the last KnuthElement in this line
        LayoutManager lastLM = lastElement.getLayoutManager();
        if (lastElement.isGlue()) {
            // Remove trailing spaces if allowed so
            if (whiteSpaceTreament == EN_IGNORE_IF_SURROUNDING_LINEFEED
                    || whiteSpaceTreament == EN_IGNORE
                    || whiteSpaceTreament == EN_IGNORE_IF_BEFORE_LINEFEED) {
                endElementIndex--;

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        for (int i = 0; i < children.getLength(); i++) {
            Node node = children.item(i); 
            if (node instanceof Element) {
                pos++;
                Element domEl = (Element)node;
                KnuthElement knuthEl = (KnuthElement)elementList.getElementList().get(pos);
                if ("skip".equals(domEl.getLocalName())) {
                    pos += Integer.parseInt(getElementText(domEl)) - 1;
                } else if ("box".equals(domEl.getLocalName())) {
                    if (!(knuthEl instanceof KnuthBox)) {
                        fail("Expected KnuthBox"
                                + " at position " + pos 
                                + " but got: " + knuthEl.getClass().getName());
                    }
                    if (domEl.getAttribute("w").length() > 0) {
                        int w = Integer.parseInt(domEl.getAttribute("w"));
                        if (w != knuthEl.getW()) {
                            fail("Expected w=" + w 
                                    + " at position " + pos 
                                    + " but got: " + knuthEl.getW());
                        }
                    }
                    if ("true".equals(domEl.getAttribute("aux"))) {
                        if (!knuthEl.isAuxiliary()) {
                            fail("Expected auxiliary box"
                                    + " at position " + pos);
                        }
                    }
                    if ("false".equals(domEl.getAttribute("aux"))) {
                        if (knuthEl.isAuxiliary()) {
                            fail("Expected a normal, not an auxiliary box"
                                    + " at position " + pos);
                        }
                    }
                } else if ("penalty".equals(domEl.getLocalName())) {
                    if (!(knuthEl instanceof KnuthPenalty)) {
                        fail("Expected KnuthPenalty "
                                + " at position " + pos 
                                + " but got: " + knuthEl.getClass().getName());
                    }
                    KnuthPenalty pen = (KnuthPenalty)knuthEl;
                    if (domEl.getAttribute("w").length() > 0) {
                        int w = Integer.parseInt(domEl.getAttribute("w"));
                        if (w != knuthEl.getW()) {
                            fail("Expected w=" + w 
                                    + " at position " + pos 
                                    + " but got: " + knuthEl.getW());
                        }
                    }
                    if (domEl.getAttribute("p").length() > 0) {
                        if ("<0".equals(domEl.getAttribute("p"))) {
                            if (knuthEl.getP() >= 0) {
                                fail("Expected p<0" 
                                        + " at position " + pos 
                                        + " but got: " + knuthEl.getP());
                            }
                        } else if (">0".equals(domEl.getAttribute("p"))) {
                            if (knuthEl.getP() <= 0) {
                                fail("Expected p>0" 
                                        + " at position " + pos 
                                        + " but got: " + knuthEl.getP());
                            }
                        } else {
                            int p;
                            if ("INF".equalsIgnoreCase(domEl.getAttribute("p"))) {
                                p = KnuthPenalty.INFINITE;
                            } else if ("INFINITE".equalsIgnoreCase(domEl.getAttribute("p"))) {
                                p = KnuthPenalty.INFINITE;
                            } else if ("-INF".equalsIgnoreCase(domEl.getAttribute("p"))) {
                                p = -KnuthPenalty.INFINITE;
                            } else if ("-INFINITE".equalsIgnoreCase(domEl.getAttribute("p"))) {
                                p = -KnuthPenalty.INFINITE;
                            } else {
                                p = Integer.parseInt(domEl.getAttribute("p"));
                            }
                            if (p != knuthEl.getP()) {
                                fail("Expected p=" + p 
                                        + " at position " + pos 
                                        + " but got: " + knuthEl.getP());
                            }
                        }
                    }
                    if ("true".equals(domEl.getAttribute("flagged"))) {
                        if (!pen.isFlagged()) {
                            fail("Expected flagged penalty"
                                    + " at position " + pos); 
                        }
                    } else if ("false".equals(domEl.getAttribute("flagged"))) {
                        if (pen.isFlagged()) {
                            fail("Expected non-flagged penalty"
                                    + " at position " + pos);
                        }
                    }
                    if ("true".equals(domEl.getAttribute("aux"))) {
                        if (!pen.isAuxiliary()) {
                            fail("Expected auxiliary penalty"
                                    + " at position " + pos); 
                        }
                    } else if ("false".equals(domEl.getAttribute("aux"))) {
                        if (pen.isAuxiliary()) {
                            fail("Expected non-auxiliary penalty"
                                    + " at position " + pos); 
                        }
                    }
                } else if ("glue".equals(domEl.getLocalName())) {
                    if (!(knuthEl instanceof KnuthGlue)) {
                        fail("Expected KnuthGlue" 
                                + " at position " + pos 
                                + " but got: " + knuthEl.getClass().getName());
                    }
                    KnuthGlue glue = (KnuthGlue)knuthEl;
                    if (domEl.getAttribute("w").length() > 0) {
                        int w = Integer.parseInt(domEl.getAttribute("w"));
                        if (w != knuthEl.getW()) {
                            fail("Expected w=" + w 
                                    + " at position " + pos 
                                    + " but got: " + knuthEl.getW());
                        }
                    }
                    if (domEl.getAttribute("y").length() > 0) {
                        int stretch = Integer.parseInt(domEl.getAttribute("y"));
                        if (stretch != knuthEl.getY()) {
                            fail("Expected y=" + stretch 
                                    + " (stretch) at position " + pos 
                                    + " but got: " + knuthEl.getY());
                        }
                    }
                    if (domEl.getAttribute("z").length() > 0) {
                        int shrink = Integer.parseInt(domEl.getAttribute("z"));
                        if (shrink != knuthEl.getZ()) {
                            fail("Expected z=" + shrink 
                                    + " (shrink) at position " + pos 
                                    + " but got: " + knuthEl.getZ());
                        }
                    }
                } else {
                    throw new IllegalArgumentException("Invalid child node for 'element-list': " 
                            + domEl.getLocalName()

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            if (elementLists[i] == null) {
                continue;
            }
            while (end[i] + 1 < elementLists[i].size()) {
                end[i]++;
                KnuthElement el = (KnuthElement)elementLists[i].get(end[i]);
                if (el.isPenalty()) {
                    this.lastMaxPenalty = Math.max(this.lastMaxPenalty, el.getW());
                    if (el.getP() <= -KnuthElement.INFINITE) {
                        log.debug("FORCED break encountered!");
                        forcedBreaks[i] = true;
                        break;
                    } else if (el.getP() < KnuthElement.INFINITE) {
                        //First legal break point
                        break;
                    }
                } else if (el.isGlue()) {
                    if (end[i] > 0) {
                        KnuthElement prev = (KnuthElement)elementLists[i].get(end[i] - 1);
                        if (prev.isBox()) {
                            //Second legal break point
                            break;
                        }
                    }
                    widths[i] += el.getW();

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                    bPrevWasKnuthBox = 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()
                            && bPrevWasKnuthBox) {
                        lastPar.addALetterSpace();
                    }
                }
            }

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Related Classes of org.apache.fop.layoutmgr.KnuthElement

org.apache.fop.layoutengine.ElementListCheck

org.apache.fop.layoutmgr.inline.ContentLayoutManager

org.apache.fop.layoutmgr.inline.FootnoteLayoutManager

org.apache.fop.layoutmgr.inline.InlineLayoutManager

org.apache.fop.layoutmgr.inline.InlineStackingLayoutManager

org.apache.fop.layoutmgr.inline.LineLayoutManager

org.apache.fop.layoutmgr.inline.LineLayoutManager$LineBreakingAlgorithm

org.apache.fop.layoutmgr.inline.LineLayoutManager$Paragraph

org.apache.fop.layoutmgr.inline.TextLayoutManager

org.apache.fop.layoutmgr.list.ListItemLayoutManager

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