Package com.nwalsh.xalan

Class Table

java.lang.Object
com.nwalsh.xalan.Table
public class Table extends Object

Xalan extensions supporting Tables

$Id: Table.java 6886 2007-06-26 18:03:49Z mzjn $

Copyright (C) 2000 Norman Walsh.

This class provides a Xalan implementation of some code to adjust CALS Tables to HTML Tables.

Column Widths

The adjustColumnWidths method takes a result tree fragment (assumed to contain the colgroup of an HTML Table) and returns the result tree fragment with the column widths adjusted to HTML terms.

Convert Lengths

The convertLength method takes a length specification of the form 9999.99xx (where "xx" is a unit) and returns that length as an integral number of pixels. For convenience, percentage lengths are returned unchanged.

The recognized units are: inches (in), centimeters (cm), millimeters (mm), picas (pc, 1pc=12pt), points (pt), and pixels (px). A number with no units is assumed to be pixels.

Change Log:

1.0

Initial release.

  • Field Details

    • unitHash

      protected static Hashtable unitHash
      The hash used to associate units with a length in pixels.

    • foURI

      protected static String foURI
      The FO namespace name.

  • Constructor Details

    • Table

      public Table()

      Constructor for Verbatim

      All of the methods are static, so the constructor does nothing.

  • Method Details

    • initializeHash

      protected static void initializeHash()
      Initialize the internal hash table with proper values.

    • setPixelsPerInch

      public static void setPixelsPerInch(int value)
      Set the pixels-per-inch value. Only positive values are legal.

    • getPixelsPerInch

      public int getPixelsPerInch()
      Return the current pixels-per-inch value.

    • convertLength

      public static int convertLength(String length)

      Convert a length specification to a number of pixels.

      The specified length should be of the form [+/-]999.99xx, where xx is a valid unit.

    • adjustColumnWidths

      public DocumentFragment adjustColumnWidths(org.apache.xalan.extensions.ExpressionContext context, NodeIterator xalanNI)

      Adjust column widths in an HTML table.

      The specification of column widths in CALS (a relative width plus an optional absolute width) are incompatible with HTML column widths. This method adjusts CALS column width specifiers in an attempt to produce equivalent HTML specifiers.

      In order for this method to work, the CALS width specifications should be placed in the "width" attribute of the <col>s within a <colgroup>. Then the colgroup result tree fragment is passed to this method.

      This method makes use of two parameters from the XSL stylesheet that calls it: nominal.table.width and table.width. The value of nominal.table.width must be an absolute distance. The value of table.width can be either absolute or relative.

      Presented with a mixture of relative and absolute lengths, the table width is used to calculate appropriate values. If the table.width is relative, the nominal width is used for this calculation.

      There are three possible combinations of values:

      1. There are no relative widths; in this case the absolute widths are used in the HTML table.
      2. There are no absolute widths; in this case the relative widths are used in the HTML table.
      3. There are a mixture of absolute and relative widths:
        1. If the table width is absolute, all widths become absolute.
        2. If the table width is relative, make all the widths absolute relative to the nominal table width then turn them all back into relative widths.
      Parameters:
      context - The stylesheet context; supplied automatically by Xalan
      xalanNI -
      Returns:
      The result tree fragment containing the adjusted colgroup.

    • correctRoundingError

      protected String[] correctRoundingError(String[] widths)
      Correct rounding errors introduced in calculating the width of each column. Make sure they sum to 100% in the end.