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Mtable.java

/*
 * Copyright 2002 - 2007 JEuclid, http://jeuclid.sf.net
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/* $Id: Mtable.java 795 2008-06-21 10:53:35Z maxberger $ */

package net.sourceforge.jeuclid.elements.presentation.table;

import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.geom.Dimension2D;
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;

import net.sourceforge.jeuclid.Constants;
import net.sourceforge.jeuclid.LayoutContext;
import net.sourceforge.jeuclid.context.InlineLayoutContext;
import net.sourceforge.jeuclid.context.Parameter;
import net.sourceforge.jeuclid.elements.JEuclidElement;
import net.sourceforge.jeuclid.elements.support.Dimension2DImpl;
import net.sourceforge.jeuclid.elements.support.ElementListSupport;
import net.sourceforge.jeuclid.elements.support.GraphicsSupport;
import net.sourceforge.jeuclid.elements.support.attributes.AttributesHelper;
import net.sourceforge.jeuclid.elements.support.attributes.HAlign;
import net.sourceforge.jeuclid.layout.GraphicsObject;
import net.sourceforge.jeuclid.layout.LayoutInfo;
import net.sourceforge.jeuclid.layout.LayoutStage;
import net.sourceforge.jeuclid.layout.LayoutView;
import net.sourceforge.jeuclid.layout.LayoutableNode;
import net.sourceforge.jeuclid.layout.LineObject;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.w3c.dom.Node;
import org.w3c.dom.mathml.MathMLLabeledRowElement;
import org.w3c.dom.mathml.MathMLNodeList;
import org.w3c.dom.mathml.MathMLTableCellElement;
import org.w3c.dom.mathml.MathMLTableElement;
import org.w3c.dom.mathml.MathMLTableRowElement;

/**
 * This class presents a table.
 * 
 * @version $Revision: 795 $
 */
// CHECKSTYLE:OFF
// Data abstraction coupling is "to high". but this is necessary for proper
// layout.
00062 public final class Mtable extends AbstractTableElement implements
        MathMLTableElement {
    // CHECKSTYLE:ON

    /**
     * The XML element from this class.
     */
00069     public static final String ELEMENT = "mtable";

    /** Attribute for columnalign. */
00072     static final String ATTR_COLUMNALIGN = "columnalign";

    /** Attribute for rowalign. */
00075     static final String ATTR_ROWALIGN = "rowalign";

    /** Attribute for groupalign. */
00078     static final String ATTR_GROUPALIGN = "groupalign";

    /** attribute for rowlines. */
00081     private static final String ATTR_ROWLINES = "rowlines";

    /** attribute for columnlines. */
00084     private static final String ATTR_COLUMNLINES = "columnlines";

    /** attribute for align. */
00087     private static final String ATTR_ALIGN = "align";

    /** attribute for alignmentscope. */
00090     private static final String ATTR_ALIGNMENTSCOPE = "alignmentscope";

    /** attribute for columnwidth. */
00093     private static final String ATTR_COLUMNWIDTH = "columnwidth";

    /** attribute for width. */
00096     private static final String ATTR_WIDTH = "width";

    /** attribute for rowspacing. */
00099     private static final String ATTR_ROWSPACING = "rowspacing";

    /** attribute for columnspacing. */
00102     private static final String ATTR_COLUMNSPACING = "columnspacing";

    /** attribute for frame. */
00105     private static final String ATTR_FRAME = "frame";

    /** attribute for framespacing. */
00108     private static final String ATTR_FRAMESPACING = "framespacing";

    /** attribute for equalrows. */
00111     private static final String ATTR_EQUALROWS = "equalrows";

    /** attribute for equalcolumns. */
00114     private static final String ATTR_EQUALCOLUMNS = "equalcolumns";

    /** attribute for displaystyle. */
00117     private static final String ATTR_DISPLAYSTYLE = "displaystyle";

    /** attribute for side. */
00120     private static final String ATTR_SIDE = "side";

    /** attribute for minlabelspacing. */
00123     private static final String ATTR_MINLABELSPACING = "minlabelspacing";

    /** value for no lines. */
00126     private static final String VALUE_NONE = "none";

    /** value for dashed lines. */
00129     private static final String VALUE_DASHED = "dashed";

    /** value for solid lines. */
00132     private static final String VALUE_SOLID = "solid";

    private static final long serialVersionUID = 1L;

    /**
     * Default column spacing.
     */
00139     private static final String DEFAULT_COLUMNSPACING = "0.8em";

    /**
     * Default row spacing.
     */
00144     private static final String DEFAULT_ROWSPACING = "1.0ex";

    /**
     * Default frame spacing.
     */
00149     private static final String DEFAULT_FRAMESPACING = "0.4em 0.5ex";

    private static final String VALUE_AUTO = "auto";

    /**
     * Logger for this class
     */
00156     private static final Log LOGGER = LogFactory.getLog(Mtable.class);

    /**
     * Class for line types.
     */
00161     public enum LineType {
        /** No lines. */
        NONE,
        /** Solid line. */
        SOLID,
        /** Dashed line. */
        DASHED;

        /**
         * Parse a string and return a linetype.
         * 
         * @param s
         *            the string to parse
         * @return a line type for this string type
         */
        public static LineType parseLineType(final String s) {
            final LineType retVal;
            if (s.equalsIgnoreCase(Mtable.VALUE_SOLID)) {
                retVal = SOLID;
            } else if (s.equalsIgnoreCase(Mtable.VALUE_DASHED)) {
                retVal = DASHED;
            } else {
                retVal = NONE;
            }
            return retVal;
        }
    };

    /**
     * Class for alignment types.
     */
00192     private static final class VAlign {

        /** Align to top. */
00195         static final int TOP = 0;

        /** Align to bottom. */
00198         static final int BOTTOM = 1;

        /** Align to center. */
00201         static final int CENTER = 2;

        /** Align to baseline. */
00204         static final int BASELINE = 3;

        /** Align to axis. */
00207         static final int AXIS = 4;

        static final String VALUE_TOP = "top";

        static final String VALUE_BOTTOM = "bottom";

        static final String VALUE_CENTER = "center";

        static final String VALUE_BASELINE = "baseline";

        static final String VALUE_AXIS = "axis";

        static final VAlign BASELINE_ALIGN = new VAlign(Mtable.VAlign.BASELINE,
                0);

        private static final String INVALID_VERTICAL_ALIGNMENT_VALUE = "Invalid vertical alignment value: ";

        private final int valign;

        private final int alignTo;

        private VAlign(final int align, final int relativeTo) {
            this.valign = align;
            this.alignTo = relativeTo;
        }

        /**
         * Parse a string and return a alignment.
         * 
         * @param s
         *            the string to parse
         * @return an alignment for this string type
         */
00240         public static VAlign parseString(final String s) {
            if ((s == null) || (s.length() == 0)) {
                return null;
            }
            final int align;
            int relativeTo = 0;
            final String s2 = s.trim().toLowerCase(Locale.ENGLISH);
            final String s3;
            if (s2.startsWith(Mtable.VAlign.VALUE_TOP)) {
                align = Mtable.VAlign.TOP;
                s3 = s2.substring(Mtable.VAlign.VALUE_TOP.length()).trim();
            } else if (s2.startsWith(Mtable.VAlign.VALUE_BOTTOM)) {
                align = Mtable.VAlign.BOTTOM;
                s3 = s2.substring(Mtable.VAlign.VALUE_BOTTOM.length()).trim();
            } else if (s2.startsWith(Mtable.VAlign.VALUE_CENTER)) {
                align = Mtable.VAlign.CENTER;
                s3 = s2.substring(Mtable.VAlign.VALUE_CENTER.length()).trim();
            } else if (s2.startsWith(Mtable.VAlign.VALUE_BASELINE)) {
                align = Mtable.VAlign.BASELINE;
                s3 = s2.substring(Mtable.VAlign.VALUE_BASELINE.length()).trim();
            } else if (s2.startsWith(Mtable.VAlign.VALUE_AXIS)) {
                align = Mtable.VAlign.AXIS;
                s3 = s2.substring(Mtable.VAlign.VALUE_AXIS.length()).trim();
            } else {
                Mtable.LOGGER
                        .warn(Mtable.VAlign.INVALID_VERTICAL_ALIGNMENT_VALUE
                                + s);
                align = Mtable.VAlign.BASELINE;
                s3 = "0";
            }
            if (s3.length() > 0) {
                try {
                    relativeTo = Integer.parseInt(s3);
                } catch (final NumberFormatException nfe) {
                    Mtable.LOGGER
                            .warn(Mtable.VAlign.INVALID_VERTICAL_ALIGNMENT_VALUE
                                    + s);
                }
            }
            return new VAlign(align, relativeTo);
        }

        public int getAlign() {
            return this.valign;
        }

        public int getRelative() {
            return this.alignTo;
        }
    }

    /**
     * Creates a math element.
     */
00294     public Mtable() {
        super();
        this.setDefaultMathAttribute(Mtable.ATTR_ALIGN,
                Mtable.VAlign.VALUE_AXIS);
        this.setDefaultMathAttribute(Mtable.ATTR_ROWALIGN,
                Mtable.VAlign.VALUE_BASELINE);
        this.setDefaultMathAttribute(Mtable.ATTR_COLUMNALIGN,
                HAlign.ALIGN_CENTER);
        this.setDefaultMathAttribute(Mtable.ATTR_GROUPALIGN, "{left}");
        this
                .setDefaultMathAttribute(Mtable.ATTR_ALIGNMENTSCOPE,
                        Constants.TRUE);
        this
                .setDefaultMathAttribute(Mtable.ATTR_COLUMNWIDTH,
                        Mtable.VALUE_AUTO);
        this.setDefaultMathAttribute(Mtable.ATTR_WIDTH, Mtable.VALUE_AUTO);
        this.setDefaultMathAttribute(Mtable.ATTR_ROWSPACING,
                Mtable.DEFAULT_ROWSPACING);
        this.setDefaultMathAttribute(Mtable.ATTR_COLUMNSPACING,
                Mtable.DEFAULT_COLUMNSPACING);
        this.setDefaultMathAttribute(Mtable.ATTR_ROWLINES, Mtable.VALUE_NONE);
        this
                .setDefaultMathAttribute(Mtable.ATTR_COLUMNLINES,
                        Mtable.VALUE_NONE);
        this.setDefaultMathAttribute(Mtable.ATTR_FRAME, Mtable.VALUE_NONE);
        this.setDefaultMathAttribute(Mtable.ATTR_FRAMESPACING,
                Mtable.DEFAULT_FRAMESPACING);
        this.setDefaultMathAttribute(Mtable.ATTR_EQUALROWS, Constants.FALSE);
        this.setDefaultMathAttribute(Mtable.ATTR_EQUALCOLUMNS, Constants.FALSE);
        this.setDefaultMathAttribute(Mtable.ATTR_DISPLAYSTYLE, Constants.FALSE);
        this.setDefaultMathAttribute(Mtable.ATTR_SIDE, HAlign.ALIGN_RIGHT);
        this.setDefaultMathAttribute(Mtable.ATTR_MINLABELSPACING,
                Mtable.DEFAULT_COLUMNSPACING);
    }

    /** {@inheritDoc} */
    @Override
00331     protected Node newNode() {
        return new Mtable();
    }

    /** {@inheritDoc} */
    @Override
00337     public LayoutContext getChildLayoutContext(final int childNum,
            final LayoutContext context) {
        return new InlineLayoutContext(this
                .applyLocalAttributesToContext(context));
    }

    private float getFramespacingh(final LayoutContext now) {
        if (Mtable.LineType.NONE.equals(this.getFrameAsLineType())) {
            return 0;
        }
        final String spacing = this.getSpaceArrayEntry(this.getFramespacing(),
                0);
        return AttributesHelper.convertSizeToPt(spacing, now,
                AttributesHelper.PT);
    }

    private float getFramespacingv(final LayoutContext now) {
        if (Mtable.LineType.NONE.equals(this.getFrameAsLineType())) {
            return 0;
        }
        final String spacing = this.getSpaceArrayEntry(this.getFramespacing(),
                1);
        return AttributesHelper.convertSizeToPt(spacing, now,
                AttributesHelper.PT);
    }

    /** {@inheritDoc} */
00364     public String getRowlines() {
        return this.getMathAttribute(Mtable.ATTR_ROWLINES);
    }

    /** {@inheritDoc} */
00369     public void setRowlines(final String rowlines) {
        this.setAttribute(Mtable.ATTR_ROWLINES, rowlines);
    }

    /** {@inheritDoc} */
00374     public String getColumnlines() {
        return this.getMathAttribute(Mtable.ATTR_COLUMNLINES);
    }

    /** {@inheritDoc} */
00379     public void setColumnlines(final String columnlines) {
        this.setAttribute(Mtable.ATTR_COLUMNLINES, columnlines);
    }

    private LineType getRowLine(final int row) {
        return Mtable.LineType.parseLineType(this.getSpaceArrayEntry(this
                .getRowlines(), row));
    }

    private LineType getColumnLine(final int col) {
        return Mtable.LineType.parseLineType(this.getSpaceArrayEntry(this
                .getColumnlines(), col));
    }

    private LineType getFrameAsLineType() {
        return Mtable.LineType.parseLineType(this.getFrame());
    }

    /**
     * Gets an entry in a white-space separated string.
     * <p>
     * If the entry requested is beyond the index, the last entry is returned.
     * 
     * @todo This method is probably useful for other attribute values. Examine,
     *       and move to a more common place. (like AttrHelper)
     * @param string
     *            the string in which to look.
     * @param index
     *            index of the element (0-based)
     * @return the element at that index
     */
00410     private String getSpaceArrayEntry(final String string, final int index) {
        final String[] array;
        if (string == null) {
            array = new String[0];
        } else {
            array = string.split("\\s");
        }
        int cur = -1;
        String last = "";
        for (final String s : array) {
            if (s.length() > 0) {
                cur++;
                if (cur == index) {
                    return s;
                }
                last = s;
            }
        }
        return last;
    }

    /** {@inheritDoc} */
00432     public String getColumnwidth() {
        return this.getMathAttribute(Mtable.ATTR_COLUMNWIDTH);
    }

    /** {@inheritDoc} */
00437     public void setColumnwidth(final String columnwidth) {
        this.setAttribute(Mtable.ATTR_COLUMNWIDTH, columnwidth);
    }

    /** {@inheritDoc} */
00442     public String getWidth() {
        return this.getMathAttribute(Mtable.ATTR_WIDTH);
    }

    /** {@inheritDoc} */
00447     public void setWidth(final String width) {
        this.setAttribute(Mtable.ATTR_WIDTH, width);
    }

    /** {@inheritDoc} */
00452     public String getAlign() {
        return this.getMathAttribute(Mtable.ATTR_ALIGN);
    }

    /** {@inheritDoc} */
00457     public void setAlign(final String align) {
        this.setAttribute(Mtable.ATTR_ALIGN, align);
    }

    /** {@inheritDoc} */
00462     public String getAlignmentscope() {
        return this.getMathAttribute(Mtable.ATTR_ALIGNMENTSCOPE);
    }

    /** {@inheritDoc} */
00467     public void setAlignmentscope(final String alignmentscope) {
        this.setAttribute(Mtable.ATTR_ALIGNMENTSCOPE, alignmentscope);
    }

    /** {@inheritDoc} */
00472     public String getRowspacing() {
        return this.getMathAttribute(Mtable.ATTR_ROWSPACING);
    }

    /** {@inheritDoc} */
00477     public void setRowspacing(final String rowspacing) {
        this.setAttribute(Mtable.ATTR_ROWSPACING, rowspacing);
    }

    /** {@inheritDoc} */
00482     public String getColumnspacing() {
        return this.getMathAttribute(Mtable.ATTR_COLUMNSPACING);
    }

    /** {@inheritDoc} */
00487     public void setColumnspacing(final String columnspacing) {
        this.setAttribute(Mtable.ATTR_COLUMNSPACING, columnspacing);
    }

    /** {@inheritDoc} */
00492     public String getFrame() {
        return this.getMathAttribute(Mtable.ATTR_FRAME);
    }

    /** {@inheritDoc} */
00497     public void setFrame(final String frame) {
        this.setAttribute(Mtable.ATTR_FRAME, frame);
    }

    /** {@inheritDoc} */
00502     public String getFramespacing() {
        return this.getMathAttribute(Mtable.ATTR_FRAMESPACING);
    }

    /** {@inheritDoc} */
00507     public void setFramespacing(final String framespacing) {
        this.setAttribute(Mtable.ATTR_FRAMESPACING, framespacing);
    }

    /** {@inheritDoc} */
00512     public String getEqualrows() {
        return this.getMathAttribute(Mtable.ATTR_EQUALROWS);
    }

    /** {@inheritDoc} */
00517     public void setEqualrows(final String equalrows) {
        this.setAttribute(Mtable.ATTR_EQUALROWS, equalrows);
    }

    /** {@inheritDoc} */
00522     public String getEqualcolumns() {
        return this.getMathAttribute(Mtable.ATTR_EQUALCOLUMNS);
    }

    /** {@inheritDoc} */
00527     public void setEqualcolumns(final String equalcolumns) {
        this.setAttribute(Mtable.ATTR_EQUALCOLUMNS, equalcolumns);
    }

    /** {@inheritDoc} */
00532     public String getDisplaystyle() {
        return this.getMathAttribute(Mtable.ATTR_DISPLAYSTYLE);
    }

    /** {@inheritDoc} */
00537     public void setDisplaystyle(final String displaystyle) {
        this.setAttribute(Mtable.ATTR_DISPLAYSTYLE, displaystyle);
    }

    /** {@inheritDoc} */
00542     public String getSide() {
        return this.getMathAttribute(Mtable.ATTR_SIDE);
    }

    /** {@inheritDoc} */
00547     public void setSide(final String side) {
        this.setAttribute(Mtable.ATTR_SIDE, side);
    }

    /** {@inheritDoc} */
00552     public String getMinlabelspacing() {
        return this.getMathAttribute(Mtable.ATTR_MINLABELSPACING);
    }

    /** {@inheritDoc} */
00557     public void setMinlabelspacing(final String minlabelspacing) {
        this.setAttribute(Mtable.ATTR_MINLABELSPACING, minlabelspacing);
    }

    /** {@inheritDoc} */
00562     public MathMLNodeList getRows() {
        // TODO: Implement
        return null;
    }

    /** {@inheritDoc} */
00568     public MathMLTableRowElement insertEmptyRow(final int index) {
        // TODO: Implement
        return null;
    }

    /** {@inheritDoc} */
00574     public MathMLLabeledRowElement insertEmptyLabeledRow(final int index) {
        // TODO: Implement
        return null;
    }

    /** {@inheritDoc} */
00580     public MathMLTableRowElement getRow(final int index) {
        // TODO: Implement
        return null;
    }

    /** {@inheritDoc} */
00586     public MathMLTableRowElement insertRow(final int index,
            final MathMLTableRowElement newRow) {
        // TODO: Implement
        return null;
    }

    /** {@inheritDoc} */
00593     public MathMLTableRowElement setRow(final int index,
            final MathMLTableRowElement newRow) {
        // TODO: Implement
        return null;
    }

    /** {@inheritDoc} */
00600     public void deleteRow(final int index) {
        // TODO: Implement
    }

    /** {@inheritDoc} */
00605     public MathMLTableRowElement removeRow(final int index) {
        // TODO: Implement
        return null;
    }

    /** {@inheritDoc} */
00611     public void deleteRow(final long index) {
        // TODO Auto-generated method stub

    }

    /** {@inheritDoc} */
00617     public MathMLTableRowElement getRow(final long index) {
        // TODO Auto-generated method stub
        return null;
    }

    /** {@inheritDoc} */
00623     public MathMLLabeledRowElement insertEmptyLabeledRow(final long index) {
        // TODO Auto-generated method stub
        return null;
    }

    /** {@inheritDoc} */
00629     public MathMLTableRowElement insertEmptyRow(final long index) {
        // TODO Auto-generated method stub
        return null;
    }

    /** {@inheritDoc} */
00635     public MathMLTableRowElement insertRow(final long index,
            final MathMLTableRowElement newRow) {
        // TODO Auto-generated method stub
        return null;
    }

    /** {@inheritDoc} */
00642     public MathMLTableRowElement removeRow(final long index) {
        // TODO Auto-generated method stub
        return null;
    }

    /** {@inheritDoc} */
00648     public MathMLTableRowElement setRow(final long index,
            final MathMLTableRowElement newRow) {
        // TODO Auto-generated method stub
        return null;
    }

    /** {@inheritDoc} */
    // CHECKSTYLE:OFF
    // Function is too long. Unfortunately it has to be for proper layout
    @Override
00658     public void layoutStageInvariant(final LayoutView view,
            final LayoutInfo info, final LayoutStage stage,
            final LayoutContext context) {
        // CHECKSTYLE:ON
        final Graphics2D g = view.getGraphics();
        final LayoutContext now = this.applyLocalAttributesToContext(context);
        final List<LayoutableNode> children = this.getChildrenToLayout();
        final LayoutInfo[] rowInfos = new LayoutInfo[children.size()];
        final LayoutableNode[] rowChild = new LayoutableNode[children.size()];
        float y = 0;
        int rows = 0;

        // Layout Rows vertically, calculate height of the table.
        final float vFrameSpacing = this.getFramespacingv(now);
        float height = vFrameSpacing;
        for (final LayoutableNode child : children) {
            rowChild[rows] = child;
            final LayoutInfo mtrInfo = view.getInfo(child);
            y += mtrInfo.getAscentHeight(stage);
            rowInfos[rows] = mtrInfo;
            rows++;
            mtrInfo.moveTo(0, y, stage);
            y += mtrInfo.getDescentHeight(stage);
            height = y;
            y += AttributesHelper.convertSizeToPt(this.getSpaceArrayEntry(this
                    .getRowspacing(), rows), now, AttributesHelper.PT);
        }
        height += vFrameSpacing;

        final float verticalShift = this.shiftTableVertically(stage, context,
                g, rowInfos, rows, height);

        final List<LayoutableNode>[] mtdChildren = this
                .createListOfMtdChildren(rowChild, rows);
        this.stretchAndAlignMtds(view, mtdChildren, rowInfos, rows, stage);

        final List<Float> columnwidth = this.calculateBasicColumnWidth(view,
                stage, rows, mtdChildren);

        // TODO This is where Alignment-Groups should be calculated

        final float totalWidth = this.layoutColumnsHorizontally(view, stage,
                now, rows, mtdChildren, columnwidth);

        this.setRowWidth(stage, rowInfos, rows, totalWidth);

        this.addRowLines(info, rowInfos, rows, totalWidth, stage, now);
        this.addColumnLines(info, columnwidth, verticalShift, height, now);
        this.addFrame(info, totalWidth, verticalShift, height, now);

        final float hFrameSpacing = this.getFramespacingh(now);
        final Dimension2D borderLeftTop = new Dimension2DImpl(hFrameSpacing,
                vFrameSpacing);
        final Dimension2D borderRightBottom = new Dimension2DImpl(
                hFrameSpacing, vFrameSpacing);
        ElementListSupport.fillInfoFromChildren(view, info, this, stage,
                borderLeftTop, borderRightBottom);
    }

    private void addFrame(final LayoutInfo info, final float width,
            final float verticalShift, final float height,
            final LayoutContext now) {
        final LineType lineType = this.getFrameAsLineType();
        final boolean solid = Mtable.LineType.SOLID.equals(lineType);
        final boolean dashed = Mtable.LineType.DASHED.equals(lineType);
        if (dashed || solid) {
            final float lineWidth = GraphicsSupport.lineWidth(now);
            final float lineInset = lineWidth / 2.0f;
            final Color color = (Color) now.getParameter(Parameter.MATHCOLOR);
            final List<GraphicsObject> go = info.getGraphicObjects();
            final float vFrameSpacing = this.getFramespacingv(now);

            final float left = lineInset;
            final float right = width - lineInset;
            final float top = verticalShift + lineInset - vFrameSpacing;
            final float bottom = height + verticalShift - lineInset;
            go.add(new LineObject(left, top, right, top, lineWidth, color,
                    dashed));
            go.add(new LineObject(left, bottom, right, bottom, lineWidth,
                    color, dashed));
            go.add(new LineObject(left, top, left, bottom, lineWidth, color,
                    dashed));
            go.add(new LineObject(right, top, right, bottom, lineWidth, color,
                    dashed));
        }
    }

    private void addRowLines(final LayoutInfo info,
            final LayoutInfo[] rowInfos, final int rows, final float width,
            final LayoutStage stage, final LayoutContext now) {
        final float lineWidth = GraphicsSupport.lineWidth(now);
        final Color color = (Color) now.getParameter(Parameter.MATHCOLOR);

        final float inFrameStart = this.getFramespacingh(now);
        for (int row = 0; row < rows - 1; row++) {
            final LineType lineType = this.getRowLine(row);
            final boolean solid = Mtable.LineType.SOLID.equals(lineType);
            final boolean dashed = Mtable.LineType.DASHED.equals(lineType);
            if (dashed || solid) {
                final float y = (rowInfos[row].getPosY(stage)
                        + rowInfos[row].getDescentHeight(stage)
                        + rowInfos[row + 1].getPosY(stage) - rowInfos[row + 1]
                        .getAscentHeight(stage)) / 2.0f;
                info.getGraphicObjects().add(
                        new LineObject(inFrameStart, y, width - inFrameStart,
                                y, lineWidth, color, dashed));
            }
        }
    }

    private void addColumnLines(final LayoutInfo info,
            final List<Float> columnwidth, final float verticalShift,
            final float height, final LayoutContext now) {
        final float lineWidth = GraphicsSupport.lineWidth(now);
        final Color color = (Color) now.getParameter(Parameter.MATHCOLOR);
        float x = this.getFramespacingh(now);

        final float inFrameStart = this.getFramespacingv(now);
        final float colsm1 = columnwidth.size() - 1;
        for (int col = 0; col < colsm1; col++) {
            final LineType lineType = this.getColumnLine(col);
            final boolean solid = Mtable.LineType.SOLID.equals(lineType);
            final boolean dashed = Mtable.LineType.DASHED.equals(lineType);
            if (dashed || solid) {
                final float halfSpace = this.getSpaceAfterColumn(now, col) / 2.0f;
                x += columnwidth.get(col) + halfSpace;
                info.getGraphicObjects().add(
                        new LineObject(x, verticalShift, x, height
                                + verticalShift - inFrameStart, lineWidth,
                                color, dashed));
                x += halfSpace;
            }
        }
    }

    private void stretchAndAlignMtds(final LayoutView view,
            final List<LayoutableNode>[] mtdChildren,
            final LayoutInfo[] rowInfos, final int rows, final LayoutStage stage) {
        for (int i = 0; i < rows; i++) {
            final float rowAscent = rowInfos[i].getAscentHeight(stage);
            final float rowDescent = rowInfos[i].getDescentHeight(stage);
            for (final LayoutableNode n : mtdChildren[i]) {
                final LayoutInfo mtdInfo = view.getInfo(n);

                final VAlign valign = this.getVAlign((JEuclidElement) n, i);
                final float verticalShift;
                if (valign.getAlign() == Mtable.VAlign.TOP) {
                    verticalShift = -rowAscent + mtdInfo.getAscentHeight(stage);
                } else if (valign.getAlign() == Mtable.VAlign.BOTTOM) {
                    verticalShift = rowDescent
                            - mtdInfo.getDescentHeight(stage);
                } else if (valign.getAlign() == Mtable.VAlign.CENTER) {
                    verticalShift = (-rowAscent + rowDescent
                            + mtdInfo.getAscentHeight(stage) - mtdInfo
                            .getDescentHeight(stage)) / 2.0f;
                } else if (valign.getAlign() == Mtable.VAlign.AXIS) {
                    // TODO: This uses center instead of axis.
                    verticalShift = (-rowAscent + rowDescent
                            + mtdInfo.getAscentHeight(stage) - mtdInfo
                            .getDescentHeight(stage)) / 2.0f;
                } else {
                    // BASELINE
                    verticalShift = 0.0f;
                }
                mtdInfo.shiftVertically(verticalShift, stage);
                mtdInfo.setStretchAscent(rowAscent + verticalShift);
                mtdInfo.setStretchDescent(rowDescent - verticalShift);
            }
        }
    }

    private float shiftTableVertically(final LayoutStage stage,
            final LayoutContext context, final Graphics2D g,
            final LayoutInfo[] rowInfos, final int rows, final float height) {
        // Shift table by given vertical alignment
        // final String alignStr = this.getAlign();
        // AlignmentType align =
        // Mtable.AlignmentType.parseAlignmentType(alignStr);
        // TODO: Proper vertical alignment;
        // This is "axis" alignment.
        final float verticalShift = -this.getMiddleShift(g, context) - height
                / 2.0f;

        for (int i = 0; i < rows; i++) {
            rowInfos[i].shiftVertically(verticalShift, stage);
        }
        return verticalShift;
    }

    @SuppressWarnings("unchecked")
    private List<LayoutableNode>[] createListOfMtdChildren(
            final LayoutableNode[] rowChild, final int rows) {
        final List<LayoutableNode>[] mtdChildren = new List[rows];
        for (int i = 0; i < rows; i++) {
            if (rowChild[i] instanceof MathMLTableRowElement) {
                mtdChildren[i] = rowChild[i].getChildrenToLayout();
            } else {
                mtdChildren[i] = new ArrayList<LayoutableNode>(1);
                mtdChildren[i].add(rowChild[i]);
            }
        }
        return mtdChildren;
    }

    private List<Float> calculateBasicColumnWidth(final LayoutView view,
            final LayoutStage stage, final int rows,
            final List<LayoutableNode>[] mtdChildren) {
        final List<Float> columnwidth = new ArrayList<Float>();
        for (int i = 0; i < rows; i++) {
            int missing = mtdChildren[i].size() - columnwidth.size();
            while (missing > 0) {
                columnwidth.add(0.0f);
                missing--;
            }
            int col = 0;
            for (final LayoutableNode n : mtdChildren[i]) {
                final float width = Math.max(columnwidth.get(col), view
                        .getInfo(n).getWidth(stage));
                columnwidth.set(col, width);
                col++;
            }
        }
        if (Boolean.parseBoolean(this.getEqualcolumns())) {
            this.makeEqual(columnwidth);
        }
        return columnwidth;
    }

    private void makeEqual(final List<Float> columnwidth) {
        float maxWidth = 0.0f;
        for (final Float width : columnwidth) {
            maxWidth = Math.max(width, maxWidth);
        }
        final int cols = columnwidth.size();
        for (int i = 0; i < cols; i++) {
            columnwidth.set(i, maxWidth);
        }
    }

    private void setRowWidth(final LayoutStage stage,
            final LayoutInfo[] rowInfos, final int rows, final float totalWidth) {
        for (int i = 0; i < rows; i++) {
            rowInfos[i].setWidth(totalWidth, stage);
        }
    }

    private float layoutColumnsHorizontally(final LayoutView view,
            final LayoutStage stage, final LayoutContext now, final int rows,
            final List<LayoutableNode>[] mtdChildren,
            final List<Float> columnwidth) {
        final float hFrameSpacing = this.getFramespacingh(now);
        float totalWidth = hFrameSpacing;
        for (int i = 0; i < rows; i++) {
            float x = hFrameSpacing;
            int col = 0;
            for (final LayoutableNode n : mtdChildren[i]) {
                final LayoutInfo mtdInfo = view.getInfo(n);
                final HAlign halign = this.getHAlign((JEuclidElement) n, col);
                final float colwi = columnwidth.get(col);
                final float xo = halign.getHAlignOffset(stage, mtdInfo, colwi);
                mtdInfo.moveTo(x + xo, mtdInfo.getPosY(stage), stage);
                // mtdInfo.setWidth(colwi, stage);
                mtdInfo.setStretchWidth(colwi);
                x += colwi;
                totalWidth = Math.max(totalWidth, x);
                x += this.getSpaceAfterColumn(now, col);
                col++;
            }
        }
        return totalWidth + hFrameSpacing;
    }

    private float getSpaceAfterColumn(final LayoutContext now, final int col) {
        final float columnSpace = AttributesHelper.convertSizeToPt(this
                .getSpaceArrayEntry(this.getColumnspacing(), col), now,
                AttributesHelper.PT);
        return columnSpace;
    }

    private HAlign getHAlign(final JEuclidElement n, final int col) {
        assert n != null;
        final HAlign retVal;
        if (n instanceof MathMLTableCellElement) {
            final MathMLTableCellElement cell = (MathMLTableCellElement) n;
            final String alignString = cell.getColumnalign();
            final HAlign halign = HAlign.parseString(alignString, null);
            if (halign == null) {
                retVal = this.getHAlign(n.getParent(), col);
            } else {
                retVal = halign;
            }
        } else if (n instanceof MathMLTableRowElement) {
            final MathMLTableRowElement rowE = (MathMLTableRowElement) n;
            final String alignArray = rowE.getColumnalign();
            if ((alignArray != null) && (alignArray.length() > 0)) {
                retVal = HAlign.parseString(this.getSpaceArrayEntry(alignArray,
                        col), HAlign.CENTER);
            } else {
                retVal = this.getHAlign(n.getParent(), col);
            }
        } else if (n instanceof MathMLTableElement) {
            final MathMLTableElement table = (MathMLTableElement) n;
            final String alignArray = table.getColumnalign();
            if ((alignArray != null) && (alignArray.length() > 0)) {
                retVal = HAlign.parseString(this.getSpaceArrayEntry(alignArray,
                        col), HAlign.CENTER);
            } else {
                retVal = HAlign.CENTER;
            }
        } else {
            retVal = this.getHAlign(n.getParent(), col);
        }
        return retVal;
    }

    private VAlign getVAlign(final JEuclidElement n, final int row) {
        assert n != null;
        final VAlign retVal;
        if (n instanceof MathMLTableCellElement) {
            final MathMLTableCellElement cell = (MathMLTableCellElement) n;
            final String alignString = cell.getRowalign();
            final Mtable.VAlign valign = Mtable.VAlign.parseString(alignString);
            if (valign == null) {
                retVal = this.getVAlign(n.getParent(), row);
            } else {
                retVal = valign;
            }
        } else if (n instanceof MathMLTableRowElement) {
            final MathMLTableRowElement rowE = (MathMLTableRowElement) n;
            final String alignString = rowE.getRowalign();
            final Mtable.VAlign valign = Mtable.VAlign.parseString(alignString);
            if (valign == null) {
                retVal = this.getVAlign(n.getParent(), row);
            } else {
                retVal = valign;
            }
        } else if (n instanceof MathMLTableElement) {
            final MathMLTableElement table = (MathMLTableElement) n;
            final String alignArray = table.getRowalign();
            if ((alignArray != null) && (alignArray.length() > 0)) {
                retVal = Mtable.VAlign.parseString(this.getSpaceArrayEntry(
                        alignArray, row));
            } else {
                retVal = Mtable.VAlign.BASELINE_ALIGN;
            }
        } else {
            retVal = this.getVAlign(n.getParent(), row);
        }
        return retVal;
    }

}

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