org.apache.tomcat.util.buf
Class StringCache

java.lang.Object
  org.apache.tomcat.util.buf.StringCache

public class StringCache
extends Object

This class implements a String cache for ByteChunk and CharChunk.

Author:

Remy Maucherat

Nested Class Summary

static class	StringCache.ByteEntry
static class	StringCache.CharEntry

Field Summary

protected static int	accessCount Access count.
protected static StringCache.ByteEntry[]	bcCache Cache for byte chunk.
protected static int	bcCount toString count for byte chunk.
protected static HashMap<StringCache.ByteEntry,int[]>	bcStats Statistics hash map for byte chunk.
protected static boolean	byteEnabled Enabled ?
protected static int	cacheSize
protected static StringCache.CharEntry[]	ccCache Cache for char chunk.
protected static int	ccCount toString count for char chunk.
protected static HashMap<StringCache.CharEntry,int[]>	ccStats Statistics hash map for char chunk.
protected static boolean	charEnabled
protected static int	hitCount Hit count.
protected static int	maxStringSize
protected static int	trainThreshold

Constructor Summary

StringCache()

Method Summary

protected static int	compare(ByteChunk name, byte[] compareTo) Compare given byte chunk with byte array.
protected static int	compare(CharChunk name, char[] compareTo) Compare given char chunk with char array.
protected static String	find(ByteChunk name) Find an entry given its name in the cache and return the associated String.
protected static String	find(CharChunk name) Find an entry given its name in the cache and return the associated String.
protected static int	findClosest(ByteChunk name, StringCache.ByteEntry[] array, int len) Find an entry given its name in a sorted array of map elements.
protected static int	findClosest(CharChunk name, StringCache.CharEntry[] array, int len) Find an entry given its name in a sorted array of map elements.
int	getAccessCount()
boolean	getByteEnabled()
int	getCacheSize()
boolean	getCharEnabled()
int	getHitCount()
int	getTrainThreshold()
void	reset()
void	setByteEnabled(boolean byteEnabled)
void	setCacheSize(int cacheSize)
void	setCharEnabled(boolean charEnabled)
void	setTrainThreshold(int trainThreshold)
static String	toString(ByteChunk bc)
static String	toString(CharChunk cc)

Methods inherited from class java.lang.Object

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

Field Detail

byteEnabled

protected static boolean byteEnabled

Enabled ?

charEnabled

protected static boolean charEnabled

trainThreshold

protected static int trainThreshold

cacheSize

protected static int cacheSize

maxStringSize

protected static int maxStringSize

bcStats

protected static HashMap<StringCache.ByteEntry,int[]> bcStats

Statistics hash map for byte chunk.

bcCount

protected static int bcCount

toString count for byte chunk.

bcCache

protected static StringCache.ByteEntry[] bcCache

Cache for byte chunk.

ccStats

protected static HashMap<StringCache.CharEntry,int[]> ccStats

Statistics hash map for char chunk.

ccCount

protected static int ccCount

toString count for char chunk.

ccCache

protected static StringCache.CharEntry[] ccCache

Cache for char chunk.

accessCount

protected static int accessCount

Access count.

hitCount

protected static int hitCount

Hit count.

Constructor Detail

StringCache

public StringCache()

Method Detail

getCacheSize

public int getCacheSize()

Returns:

Returns the cacheSize.

setCacheSize

public void setCacheSize(int cacheSize)

Parameters:

cacheSize - The cacheSize to set.

getByteEnabled

public boolean getByteEnabled()

Returns:

Returns the enabled.

setByteEnabled

public void setByteEnabled(boolean byteEnabled)

Parameters:

byteEnabled - The enabled to set.

getCharEnabled

public boolean getCharEnabled()

Returns:

Returns the enabled.

setCharEnabled

public void setCharEnabled(boolean charEnabled)

Parameters:

charEnabled - The enabled to set.

getTrainThreshold

public int getTrainThreshold()

Returns:

Returns the trainThreshold.

setTrainThreshold

public void setTrainThreshold(int trainThreshold)

Parameters:

trainThreshold - The trainThreshold to set.

getAccessCount

public int getAccessCount()

Returns:

Returns the accessCount.

getHitCount

public int getHitCount()

Returns:

Returns the hitCount.

reset

public void reset()

toString

public static String toString(ByteChunk bc)

toString

public static String toString(CharChunk cc)

compare

protected static final int compare(ByteChunk name,
                                   byte[] compareTo)

Compare given byte chunk with byte array. Return -1, 0 or +1 if inferior, equal, or superior to the String.

find

protected static final String find(ByteChunk name)

Find an entry given its name in the cache and return the associated String.

findClosest

protected static final int findClosest(ByteChunk name,
                                       StringCache.ByteEntry[] array,
                                       int len)

Find an entry given its name in a sorted array of map elements. This will return the index for the closest inferior or equal item in the given array.

compare

protected static final int compare(CharChunk name,
                                   char[] compareTo)

Compare given char chunk with char array. Return -1, 0 or +1 if inferior, equal, or superior to the String.

find

protected static final String find(CharChunk name)

Find an entry given its name in the cache and return the associated String.

findClosest

protected static final int findClosest(CharChunk name,
                                       StringCache.CharEntry[] array,
                                       int len)

Find an entry given its name in a sorted array of map elements. This will return the index for the closest inferior or equal item in the given array.