Package org.apache.fop.layoutmgr

Class ElementListUtils

java.lang.Object
org.apache.fop.layoutmgr.ElementListUtils
public final class ElementListUtils extends Object
Utilities for Knuth element lists.

  • Method Details

    • removeLegalBreaks

      public static boolean removeLegalBreaks(List elements, MinOptMax constraint)
      Removes legal breaks in an element list. A constraint can be specified to limit the range in which the breaks are removed. Legal breaks occuring before at least constraint.opt space is filled will be removed.
      Parameters:
      elements - the element list
      constraint - min/opt/max value to restrict the range in which the breaks are removed.
      Returns:
      true if the opt constraint is bigger than the list contents

    • removeLegalBreaks

      public static boolean removeLegalBreaks(List elements, int constraint)
      Removes legal breaks in an element list. A constraint can be specified to limit the range in which the breaks are removed. Legal breaks occuring before at least constraint space is filled will be removed.
      Parameters:
      elements - the element list
      constraint - value to restrict the range in which the breaks are removed.
      Returns:
      true if the constraint is bigger than the list contents

    • removeLegalBreaksFromEnd

      public static boolean removeLegalBreaksFromEnd(List elements, int constraint)
      Removes legal breaks in an element list. A constraint can be specified to limit the range in which the breaks are removed. Legal breaks within the space specified through the constraint (starting from the end of the element list) will be removed.
      Parameters:
      elements - the element list
      constraint - value to restrict the range in which the breaks are removed.
      Returns:
      true if the constraint is bigger than the list contents

    • calcContentLength

      public static int calcContentLength(List elems, int start, int end)
      Calculates the content length of the given element list. Warning: It doesn't take any stretch and shrink possibilities into account.
      Parameters:
      elems - the element list
      start - element at which to start
      end - element at which to stop
      Returns:
      the content length

    • calcContentLength

      public static int calcContentLength(List elems)
      Calculates the content length of the given element list. Warning: It doesn't take any stretch and shrink possibilities into account.
      Parameters:
      elems - the element list
      Returns:
      the content length

    • endsWithForcedBreak

      public static boolean endsWithForcedBreak(List elems)
      Indicates whether the given element list ends with a forced break.
      Parameters:
      elems - the element list
      Returns:
      true if the list ends with a forced break

    • startsWithForcedBreak

      public static boolean startsWithForcedBreak(List elems)
      Indicates whether the given element list starts with a forced break.
      Parameters:
      elems - the element list
      Returns:
      true if the list starts with a forced break

    • endsWithNonInfinitePenalty

      public static boolean endsWithNonInfinitePenalty(List elems)
      Indicates whether the given element list ends with a penalty with a non-infinite penalty value.
      Parameters:
      elems - the element list
      Returns:
      true if the list ends with a non-infinite penalty

    • determinePreviousBreak

      public static int determinePreviousBreak(List elems, int startIndex)
      Determines the position of the previous break before the start index on an element list.
      Parameters:
      elems - the element list
      startIndex - the start index
      Returns:
      the position of the previous break, or -1 if there was no previous break

    • isEmptyBox

      public static boolean isEmptyBox(List elements)