Package mars.venus.editor.jeditsyntax

Class KeywordMap

java.lang.Object

mars.venus.editor.jeditsyntax.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 MIPSTokenMarker to map keywords to ids.

Version:

$Id: KeywordMap.java,v 1.16 1999/12/13 03:40:30 sp Exp $

Author:

Slava Pestov, Mike Dillon

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method	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 segment, int offset, int length)
protected int	getStringMapKey(String string)
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.
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Details

KeywordMap

public KeywordMap(boolean ignoreCase)

Creates a new KeywordMap.

Parameters:

ignoreCase - True if keys are case insensitive

KeywordMap

public KeywordMap(boolean ignoreCase,
 int capacity)

Creates a new KeywordMap.

Parameters:

ignoreCase - True if the keys are case insensitive

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

Method Details

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

Returns:

The token type for the keyword

add

public void add(String keyword,
 byte id)

Adds a key-value mapping.

Parameters:

keyword - The key

id - The value

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 string)

getSegmentMapKey

protected int getSegmentMapKey(Segment segment,
 int offset,
 int length)

toString

public String toString()

Overrides:

toString in class Object