Package com.day.text

Class Replace

java.lang.Object

com.day.text.Replace

public class Replace
extends Object

The Replace class implements the string replacement functionality formerly coded in the base/base_replace.c C file. This class acts as a data container for the concrete replacement definition and also does the actual replacement for the String/UString ECMA host object and also for Java clients.

The usage of this class is relatively simple :

1. Acquire an instance through the default constructor
2. Add Pattern strings through the addPattern(String, String), addPattern(int, String, String) or addPatterns(String[][]) calls
3. Optionally set replacement flags
4. call replace(String, int) for each string you want to work on

The flags for the replacement are defined as follows :

REPLACE_IGNORE_HTML

Don't replace anything contained within a tag enclosed in < and >, resp.

REPLACE_WHOLE_WORD

Only replace occurrences of patterns when they form standalone words.

The replacement algorithm works in three steps :

1. All occurrences of the patterns are looked for in the string
2. Within theses occurrences, collisions are resolved using a weighting algorithm which is based on the pattern length using a weight reference.
3. For each occurrence not invalidated through collision detection, the pattern is replaced by the replacement. The rest of the input String is copied to the destination unmodified.

Field Summary

Fields

Modifier and Type	Field	Description
static final int	REPLACE_IGNORE_HTML	Replacement flag to ignore any strings occuring within HTML tags
static final int	REPLACE_NONE	Replacment flag indicating no special treatment
static final int	REPLACE_WHOLE_WORD	Replacement flag to only replace search words occuring as stand- alone words

Constructor Summary

Constructors

Constructor	Description
Replace()	Default constructor for the replacement object

Method Summary

Modifier and Type	Method	Description
void	addPattern(int pos, String pattern, String replacement)	Insert the pattern at the indicated position in the internal pattern list
void	addPattern(String pattern, String replacement)	Append the pattern to the internal pattern list
void	addPatterns(String[][] prPairs)	Append all the pattern/replacement String pairs to the list.
int	getFlags()	Returns the current flags
Iterator	getPatterns()	Returns an iterator over the existing patterns
String	replace(String source)	calls replace(String, int) with wref=0
String	replace(String source, int wref)	The real replacement of the patterns within the input takes place here.
void	setFlags(int flags)	Set the indicated replacement flags

Methods inherited from class java.lang.Object

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

Field Details

REPLACE_NONE

public static final int REPLACE_NONE

Replacment flag indicating no special treatment

See Also:

• Constant Field Values

REPLACE_IGNORE_HTML

public static final int REPLACE_IGNORE_HTML

Replacement flag to ignore any strings occuring within HTML tags

See Also:

• Constant Field Values

REPLACE_WHOLE_WORD

public static final int REPLACE_WHOLE_WORD

Replacement flag to only replace search words occuring as stand- alone words

See Also:

• Constant Field Values

Constructor Details

Replace

public Replace()

Default constructor for the replacement object

Method Details

replace

public String replace(String source)

calls replace(String, int) with wref=0

replace

public String replace(String source,
 int wref)

The real replacement of the patterns within the input takes place here.

Parameters:

source - The String to do the work in

wref - Reference weight (?)

setFlags

public void setFlags(int flags)

Set the indicated replacement flags

Parameters:

flags - The flags to set

getFlags

public int getFlags()

Returns the current flags

Returns:

the current flags

addPattern

public void addPattern(int pos,
 String pattern,
 String replacement)

Insert the pattern at the indicated position in the internal pattern list

Parameters:

pos - The position to insert the pattern at

pattern - The pattern String for the new pattern

replacement - The replacement String for the new pattern

addPattern

public void addPattern(String pattern,
 String replacement)

Append the pattern to the internal pattern list

Parameters:

pattern - The pattern String for the new pattern

replacement - The replacement String for the new pattern

addPatterns

public void addPatterns(String[][] prPairs)

Append all the pattern/replacement String pairs to the list. Each entry is supposed to contain at least two entries.

Parameters:

prPairs - An Array of pattern/replacement String pairs.

getPatterns

public Iterator getPatterns()

Returns an iterator over the existing patterns

Returns:

an iterator over the existing patterns