org.apache.jasper.xmlparser

Class XMLChar

java.lang.Object

org.apache.jasper.xmlparser.XMLChar

public class XMLChar
extends Object

This class defines the basic XML character properties. The data in this class can be used to verify that a character is a valid XML character or if the character is a space, name start, or name character.

A series of convenience methods are supplied to ease the burden of the developer. Because inlining the checks can improve per character performance, the tables of character properties are public. Using the character as an index into the CHARS array and applying the appropriate mask flag (e.g. MASK_VALID), yields the same results as calling the convenience methods. There is one exception: check the comments for the isValid method for details.

Author:

Glenn Marcy, IBM, Andy Clark, IBM, Eric Ye, IBM, Arnaud Le Hors, IBM, Michael Glavassevich, IBM, Rahul Srivastava, Sun Microsystems Inc.

Constructor Summary

Constructors

Constructor and Description
XMLChar()

Method Summary

Methods

Modifier and Type	Method and Description
static boolean	isContent(int c) Returns true if the specified character can be considered content.
static boolean	isHighSurrogate(int c) Returns whether the given character is a high surrogate
static boolean	isInvalid(int c) Returns true if the specified character is invalid.
static boolean	isLowSurrogate(int c) Returns whether the given character is a low surrogate
static boolean	isName(int c) Returns true if the specified character is a valid name character as defined by production [4] in the XML 1.0 specification.
static boolean	isNameStart(int c) Returns true if the specified character is a valid name start character as defined by production [5] in the XML 1.0 specification.
static boolean	isSpace(int c) Returns true if the specified character is a space character as defined by production [3] in the XML 1.0 specification.
static boolean	isValid(int c) Returns true if the specified character is valid.
static boolean	isValidIANAEncoding(String ianaEncoding) Returns true if the encoding name is a valid IANA encoding.
static int	supplemental(char h, char l) Returns true the supplemental character corresponding to the given surrogates.

Methods inherited from class java.lang.Object

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

Constructor Detail

XMLChar

public XMLChar()

Method Detail

supplemental

public static int supplemental(char h,
               char l)

Returns true the supplemental character corresponding to the given surrogates.

Parameters:

h - The high surrogate.

l - The low surrogate.

isHighSurrogate

public static boolean isHighSurrogate(int c)

Returns whether the given character is a high surrogate

Parameters:

c - The character to check.

isLowSurrogate

public static boolean isLowSurrogate(int c)

Returns whether the given character is a low surrogate

Parameters:

c - The character to check.

isValid

public static boolean isValid(int c)

Returns true if the specified character is valid. This method also checks the surrogate character range from 0x10000 to 0x10FFFF.

If the program chooses to apply the mask directly to the CHARS array, then they are responsible for checking the surrogate character range.

Parameters:

c - The character to check.

isInvalid

public static boolean isInvalid(int c)

Returns true if the specified character is invalid.

Parameters:

c - The character to check.

isContent

public static boolean isContent(int c)

Returns true if the specified character can be considered content.

Parameters:

c - The character to check.

isSpace

public static boolean isSpace(int c)

Returns true if the specified character is a space character as defined by production [3] in the XML 1.0 specification.

Parameters:

c - The character to check.

isNameStart

public static boolean isNameStart(int c)

Returns true if the specified character is a valid name start character as defined by production [5] in the XML 1.0 specification.

Parameters:

c - The character to check.

isName

public static boolean isName(int c)

Returns true if the specified character is a valid name character as defined by production [4] in the XML 1.0 specification.

Parameters:

c - The character to check.

isValidIANAEncoding

public static boolean isValidIANAEncoding(String ianaEncoding)

Returns true if the encoding name is a valid IANA encoding. This method does not verify that there is a decoder available for this encoding, only that the characters are valid for an IANA encoding name.

Parameters:

ianaEncoding - The IANA encoding name.