alice.util.jedit

Class KeywordMap

java.lang.Object

alice.util.jedit.KeywordMap

public class KeywordMap
extends Object

A KeywordMap is similar to a hashtable in that it maps keys to values. However, the `keys' are Swing segments. This allows lookups of text substrings without the overhead of creating a new string object.

This class is used by CTokenMarker to map keywords to ids.

Author:

Slava Pestov, Mike Dillon

Field Summary

Fields

Modifier and Type	Field and Description
protected int	mapLength

Constructor Summary

Constructors

Constructor and Description
KeywordMap(boolean ignoreCase) Creates a new KeywordMap.
KeywordMap(boolean ignoreCase, int mapLength) Creates a new KeywordMap.

Method Summary

Methods

Modifier and Type	Method and Description
void	add(String keyword, byte id) Adds a key-value mapping.
boolean	getIgnoreCase() Returns true if the keyword map is set to be case insensitive, false otherwise.
protected int	getSegmentMapKey(Segment s, int off, int len)
protected int	getStringMapKey(String s)
byte	lookup(Segment text, int offset, int length) Looks up a key.
void	setIgnoreCase(boolean ignoreCase) Sets if the keyword map should be case insensitive.

Methods inherited from class java.lang.Object

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

Field Detail

mapLength

protected int mapLength

Constructor Detail

KeywordMap

public KeywordMap(boolean ignoreCase)

Creates a new KeywordMap.

Parameters:

ignoreCase - True if keys are case insensitive

KeywordMap

public KeywordMap(boolean ignoreCase,
          int mapLength)

Creates a new KeywordMap.

Parameters:

ignoreCase - True if the keys are case insensitive

mapLength - The number of `buckets' to create. A value of 52 will give good performance for most maps.

Method Detail

lookup

public byte lookup(Segment text,
          int offset,
          int length)

Looks up a key.

Parameters:

text - The text segment

offset - The offset of the substring within the text segment

length - The length of the substring

add

public void add(String keyword,
       byte id)

Adds a key-value mapping.

Parameters:

keyword - The key

getIgnoreCase

public boolean getIgnoreCase()

Returns true if the keyword map is set to be case insensitive, false otherwise.

setIgnoreCase

public void setIgnoreCase(boolean ignoreCase)

Sets if the keyword map should be case insensitive.

Parameters:

ignoreCase - True if the keyword map should be case insensitive, false otherwise

getStringMapKey

protected int getStringMapKey(String s)

getSegmentMapKey

protected int getSegmentMapKey(Segment s,
                   int off,
                   int len)