com.ibm.commons.util.io
Class CharacterStreamCache

java.lang.Object
  com.ibm.commons.util.io.CharacterStreamCache

public class CharacterStreamCache
extends java.lang.Object

Characters buffer.

This class is used to store characters and provides both an Writer for storing the bytes and an Reader for reading them. It stores the characters in memory in a highly optimized way, with a possibility of using a backing file when the content is bigger than a predefined threshold.

Nested Class Summary

protected class	CharacterStreamCache.InternalReader
protected class	CharacterStreamCache.InternalWriter

Field Summary

static int	DEFAULT_BLOCKSIZE
static int	DEFAULT_THRESHOLD

Constructor Summary

CharacterStreamCache()

CharacterStreamCache(int blockSize, int threshold)

Method Summary

void	clear() Clear the data inside the cache.
void	copyFrom(java.io.Reader r) Init the data from an existing reader.
void	copyTo(java.io.File f) Copy the stream to a file.
void	copyTo(java.io.Writer w) Copy the stream to another stream.
char	getChar(int pos) Get an indexed character.
long	getLength() Get the number of stored bytes.
java.io.Reader	getReader() Get a reader on the stored data.
java.io.Writer	getWriter() Get a writer to store the data.
boolean	isEqual(CharacterStreamCache other)
char[]	toCharArray() Convert to a char array.
java.lang.String	toString()
void	write(char[] b, int off, int len)
void	write(int b)

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_BLOCKSIZE

public static final int DEFAULT_BLOCKSIZE

See Also:

Constant Field Values

DEFAULT_THRESHOLD

public static final int DEFAULT_THRESHOLD

See Also:

Constant Field Values

Constructor Detail

CharacterStreamCache

public CharacterStreamCache()

CharacterStreamCache

public CharacterStreamCache(int blockSize,
                            int threshold)

Method Detail

isEqual

public boolean isEqual(CharacterStreamCache other)

getLength

public long getLength()

Get the number of stored bytes.

getChar

public char getChar(int pos)

Get an indexed character.

clear

public void clear()

Clear the data inside the cache.

getReader

public java.io.Reader getReader()

Get a reader on the stored data.

getWriter

public java.io.Writer getWriter()

Get a writer to store the data.

copyFrom

public void copyFrom(java.io.Reader r)
              throws java.io.IOException

Init the data from an existing reader.

Throws:

java.io.IOException

copyTo

public void copyTo(java.io.Writer w)
            throws java.io.IOException

Copy the stream to another stream.

Throws:

java.io.IOException

copyTo

public void copyTo(java.io.File f)
            throws java.io.IOException

Copy the stream to a file.

Throws:

java.io.IOException

toCharArray

public char[] toCharArray()

Convert to a char array. WARN: this fct is *not* really optimized!

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

write

public final void write(int b)
                 throws java.io.IOException

Throws:

java.io.IOException

write

public final void write(char[] b,
                        int off,
                        int len)
                 throws java.io.IOException

Throws:

java.io.IOException