Package org.apache.tomcat.util.buf

Class CharChunk

java.lang.Object

org.apache.tomcat.util.buf.AbstractChunk

org.apache.tomcat.util.buf.CharChunk

All Implemented Interfaces:

Serializable, CharSequence, Cloneable

public final class CharChunk
extends AbstractChunk
implements CharSequence

Utilities to manipulate char chunks. While String is the easiest way to manipulate chars ( search, substrings, etc), it is known to not be the most efficient solution - Strings are designed as immutable and secure objects.

Author:

dac@sun.com, James Todd [gonzo@sun.com], Costin Manolache, Remy Maucherat

See Also:

• Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static interface	CharChunk.CharInputChannel	Input interface, used when the buffer is empty.
static interface	CharChunk.CharOutputChannel	When we need more space we'll either grow the buffer ( up to the limit ) or send it to a channel.

Field Summary

Fields inherited from class org.apache.tomcat.util.buf.AbstractChunk

ARRAY_MAX_SIZE, end, hasHashCode, isSet, sm, start

Constructor Summary

Constructors

Constructor	Description
CharChunk()	Creates a new, uninitialized CharChunk object.
CharChunk(int initial)

Method Summary

Modifier and Type	Method	Description
void	allocate(int initial, int limit)
void	append(char c)
void	append(char[] src, int off, int len)	Add data to the buffer.
void	append(String s)	Append a string to the buffer.
void	append(String s, int off, int len)	Append a string to the buffer.
void	append(CharChunk src)
char	charAt(int index)
Object	clone()
boolean	endsWith(String s)
boolean	equals(char[] b2, int off2, int len2)
boolean	equals(Object obj)
boolean	equals(String s)	Compares the message bytes to the specified String object.
boolean	equals(CharChunk cc)
boolean	equalsIgnoreCase(String s)	Compares the message bytes to the specified String object.
void	flushBuffer()	Send the buffer to the sink.
char[]	getBuffer()
protected int	getBufferElement(int index)
char[]	getChars()
int	indexOf(char c)
static int	indexOf(char[] chars, int start, int end, char s)	Returns the first instance of the given character in the given char array between the specified start and end.
int	indexOf(char c, int starting)	Returns the first instance of the given character in this CharChunk starting at the specified char.
int	length()
void	makeSpace(int count)	Make space for len chars.
void	setCharInputChannel(CharChunk.CharInputChannel in)	When the buffer is empty, read the data from the input channel.
void	setCharOutputChannel(CharChunk.CharOutputChannel out)	When the buffer is full, write the data to the output channel.
void	setChars(char[] c, int off, int len)	Sets the buffer to the specified subarray of characters.
boolean	startsWith(String s)
boolean	startsWithIgnoreCase(String s, int pos)	Returns true if the buffer starts with the specified string.
CharSequence	subSequence(int start, int end)
int	subtract()
int	subtract(char[] dest, int off, int len)
String	toString()
String	toStringInternal()

Methods inherited from class org.apache.tomcat.util.buf.AbstractChunk

getEnd, getLength, getLimit, getLimitInternal, getOffset, getStart, hash, hashCode, indexOf, isNull, recycle, setEnd, setLimit, setOffset, setStart

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.lang.CharSequence

chars, codePoints, isEmpty

Constructor Details

CharChunk

public CharChunk()

Creates a new, uninitialized CharChunk object.

CharChunk

public CharChunk(int initial)

Method Details

clone

public Object clone()
             throws CloneNotSupportedException

Overrides:

clone in class Object

Throws:

CloneNotSupportedException

allocate

public void allocate(int initial,
 int limit)

setChars

public void setChars(char[] c,
 int off,
 int len)

Sets the buffer to the specified subarray of characters.

Parameters:

c - the characters

off - the start offset of the characters

len - the length of the characters

getChars

public char[] getChars()

Returns:

the buffer.

getBuffer

public char[] getBuffer()

Returns:

the buffer.

setCharInputChannel

public void setCharInputChannel(CharChunk.CharInputChannel in)

When the buffer is empty, read the data from the input channel.

Parameters:

in - The input channel

setCharOutputChannel

public void setCharOutputChannel(CharChunk.CharOutputChannel out)

When the buffer is full, write the data to the output channel. Also used when large amount of data is appended. If not set, the buffer will grow to the limit.

Parameters:

out - The output channel

append

public void append(char c)
            throws IOException

Throws:

IOException

append

public void append(CharChunk src)
            throws IOException

Throws:

IOException

append

public void append(char[] src,
 int off,
 int len)
            throws IOException

Add data to the buffer.

Parameters:

src - Char array

off - Offset

len - Length

Throws:

IOException - Writing overflow data to the output channel failed

append

public void append(String s)
            throws IOException

Append a string to the buffer.

Parameters:

s - The string

Throws:

IOException - Writing overflow data to the output channel failed

append

public void append(String s,
 int off,
 int len)
            throws IOException

Append a string to the buffer.

Parameters:

s - The string

off - Offset

len - Length

Throws:

IOException - Writing overflow data to the output channel failed

subtract

public int subtract()
             throws IOException

Throws:

IOException

subtract

public int subtract(char[] dest,
 int off,
 int len)
             throws IOException

Throws:

IOException

flushBuffer

public void flushBuffer()
                 throws IOException

Send the buffer to the sink. Called by append() when the limit is reached. You can also call it explicitly to force the data to be written.

Throws:

IOException - Writing overflow data to the output channel failed

makeSpace

public void makeSpace(int count)

Make space for len chars. If len is small, allocate a reserve space too. Never grow bigger than the limit or AbstractChunk.ARRAY_MAX_SIZE.

Parameters:

count - The size

toString

public String toString()

Specified by:

toString in interface CharSequence

Overrides:

toString in class Object

toStringInternal

public String toStringInternal()

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

equals

public boolean equals(String s)

Compares the message bytes to the specified String object.

Parameters:

s - the String to compare

Returns:

true if the comparison succeeded, false otherwise

equalsIgnoreCase

public boolean equalsIgnoreCase(String s)

Compares the message bytes to the specified String object.

Parameters:

s - the String to compare

Returns:

true if the comparison succeeded, false otherwise

equals

public boolean equals(CharChunk cc)

equals

public boolean equals(char[] b2,
 int off2,
 int len2)

startsWith

public boolean startsWith(String s)

Parameters:

s - The string

Returns:

true if the message bytes starts with the specified string.

startsWithIgnoreCase

public boolean startsWithIgnoreCase(String s,
 int pos)

Returns true if the buffer starts with the specified string.

Parameters:

s - the string

pos - The position

Returns:

true if the start matches

endsWith

public boolean endsWith(String s)

Parameters:

s - The string

Returns:

true if the message bytes end with the specified string.

getBufferElement

protected int getBufferElement(int index)

Specified by:

getBufferElement in class AbstractChunk

Parameters:

index - the element location in the buffer

Returns:

the element

indexOf

public int indexOf(char c)

indexOf

public int indexOf(char c,
 int starting)

Returns the first instance of the given character in this CharChunk starting at the specified char. If the character is not found, -1 is returned.

Parameters:

c - The character

starting - The start position

Returns:

The position of the first instance of the character or -1 if the character is not found.

indexOf

public static int indexOf(char[] chars,
 int start,
 int end,
 char s)

Returns the first instance of the given character in the given char array between the specified start and end.

Parameters:

chars - The array to search

start - The point to start searching from in the array

end - The point to stop searching in the array

s - The character to search for

Returns:

The position of the first instance of the character or -1 if the character is not found.

charAt

public char charAt(int index)

Specified by:

charAt in interface CharSequence

subSequence

public CharSequence subSequence(int start,
 int end)

Specified by:

subSequence in interface CharSequence

length

public int length()

Specified by:

length in interface CharSequence