org.apache.fop.layoutmgr

Class ElementListUtils

java.lang.Object

org.apache.fop.layoutmgr.ElementListUtils

public class ElementListUtils
extends java.lang.Object

Utilities for Knuth element lists.

Constructor Summary

Constructors

Constructor and Description
ElementListUtils()

Method Summary

Methods

Modifier and Type	Method and Description
static int	calcContentLength(java.util.List elems) Calculates the content length of the given element list.
static int	calcContentLength(java.util.List elems, int start, int end) Calculates the content length of the given element list.
static int	determinePreviousBreak(java.util.List elems, int startIndex) Determines the position of the previous break before the start index on an element list.
static boolean	endsWithForcedBreak(java.util.LinkedList elems) Indicates whether the given element list ends with a forced break.
static boolean	removeLegalBreaks(java.util.LinkedList elements, int constraint) Removes legal breaks in an element list.
static boolean	removeLegalBreaks(java.util.LinkedList elements, MinOptMax constraint) Removes legal breaks in an element list.
static boolean	removeLegalBreaksFromEnd(java.util.LinkedList elements, int constraint) Removes legal breaks in an element list.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ElementListUtils

public ElementListUtils()

Method Detail

removeLegalBreaks

public static boolean removeLegalBreaks(java.util.LinkedList 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(java.util.LinkedList 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(java.util.LinkedList 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(java.util.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(java.util.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(java.util.LinkedList 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

determinePreviousBreak

public static int determinePreviousBreak(java.util.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