XMLChar (Xerces2 Implementation)

java.lang.Object
- org.apache.xerces.util.XMLChar

```
public class XMLChar
extends java.lang.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.

Version:

$Id: XMLChar.java 674378 2008-07-07 00:52:45Z mrglavas $

Author:

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

Field Summary

Fields
Modifier and Type	Field and Description
`static int`	`MASK_CONTENT` Content character mask.
`static int`	`MASK_NAME` Name character mask.
`static int`	`MASK_NAME_START` Name start character mask.
`static int`	`MASK_NCNAME` NCName character mask.
`static int`	`MASK_NCNAME_START` NCName start character mask.
`static int`	`MASK_PUBID` Pubid character mask.
`static int`	`MASK_SPACE` Space character mask.
`static int`	`MASK_VALID` Valid character mask.

Constructor Summary

Constructors
Constructor and Description

XMLChar()

Constructors
Constructor and Description
`XMLChar()`

Method Summary

Methods
Modifier and Type	Method and Description
`static char`	`highSurrogate(int c)` Returns the high surrogate of a supplemental character
`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`	`isMarkup(int c)` Returns true if the specified character can be considered markup.
`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`	`isNCName(int c)` Returns true if the specified character is a valid NCName character as defined by production [5] in Namespaces in XML recommendation.
`static boolean`	`isNCNameStart(int c)` Returns true if the specified character is a valid NCName start character as defined by production [4] in Namespaces in XML recommendation.
`static boolean`	`isPubid(int c)` Returns true if the specified character is a valid Pubid character as defined by production [13] 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`	`isSupplemental(int c)` Returns true if the specified character is a supplemental character.
`static boolean`	`isValid(int c)` Returns true if the specified character is valid.
`static boolean`	`isValidIANAEncoding(java.lang.String ianaEncoding)` Returns true if the encoding name is a valid IANA encoding.
`static boolean`	`isValidJavaEncoding(java.lang.String javaEncoding)` Returns true if the encoding name is a valid Java encoding.
`static boolean`	`isValidName(java.lang.String name)` Check to see if a string is a valid Name according to [5] in the XML 1.0 Recommendation
`static boolean`	`isValidNCName(java.lang.String ncName)` Check to see if a string is a valid NCName according to [4] from the XML Namespaces 1.0 Recommendation
`static boolean`	`isValidNmtoken(java.lang.String nmtoken)` Check to see if a string is a valid Nmtoken according to [7] in the XML 1.0 Recommendation
`static char`	`lowSurrogate(int c)` Returns the low surrogate of a supplemental character
`static int`	`supplemental(char h, char l)` Returns true the supplemental character corresponding to the given surrogates.
`static java.lang.String`	`trim(java.lang.String value)` Trims space characters as defined by production [3] in the XML 1.0 specification from both ends of the given string.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - MASK_VALID
```
public static final int MASK_VALID
```
    Valid character mask.
    
    See Also:
    Constant Field Values
  - MASK_SPACE
```
public static final int MASK_SPACE
```
    Space character mask.
    
    See Also:
    Constant Field Values
  - MASK_NAME_START
```
public static final int MASK_NAME_START
```
    Name start character mask.
    
    See Also:
    Constant Field Values
  - MASK_NAME
```
public static final int MASK_NAME
```
    Name character mask.
    
    See Also:
    Constant Field Values
  - MASK_PUBID
```
public static final int MASK_PUBID
```
    Pubid character mask.
    
    See Also:
    Constant Field Values
  - MASK_CONTENT
```
public static final int MASK_CONTENT
```
    Content character mask. Special characters are those that can be considered the start of markup, such as '<' and '&'. The various newline characters are considered special as well. All other valid XML characters can be considered content.
    This is an optimization for the inner loop of character scanning.
    
    See Also:
    Constant Field Values
  - MASK_NCNAME_START
```
public static final int MASK_NCNAME_START
```
    NCName start character mask.
    
    See Also:
    Constant Field Values
  - MASK_NCNAME
```
public static final int MASK_NCNAME
```
    NCName character mask.
    
    See Also:
    Constant Field Values
- Constructor Detail
  - XMLChar
```
public XMLChar()
```
- Method Detail
  - isSupplemental
```
public static boolean isSupplemental(int c)
```
    Returns true if the specified character is a supplemental character.
    
    Parameters:
    c - The character to check.
  - 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.
  - highSurrogate
```
public static char highSurrogate(int c)
```
    Returns the high surrogate of a supplemental character
    
    Parameters:
    c - The supplemental character to "split".
  - lowSurrogate
```
public static char lowSurrogate(int c)
```
    Returns the low surrogate of a supplemental character
    
    Parameters:
    c - The supplemental character to "split".
  - 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.
  - isMarkup
```
public static boolean isMarkup(int c)
```
    Returns true if the specified character can be considered markup. Markup characters include '<', '&', and '%'.
    
    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.
  - isNCNameStart
```
public static boolean isNCNameStart(int c)
```
    Returns true if the specified character is a valid NCName start character as defined by production [4] in Namespaces in XML recommendation.
    
    Parameters:
    c - The character to check.
  - isNCName
```
public static boolean isNCName(int c)
```
    Returns true if the specified character is a valid NCName character as defined by production [5] in Namespaces in XML recommendation.
    
    Parameters:
    c - The character to check.
  - isPubid
```
public static boolean isPubid(int c)
```
    Returns true if the specified character is a valid Pubid character as defined by production [13] in the XML 1.0 specification.
    
    Parameters:
    c - The character to check.
  - isValidName
```
public static boolean isValidName(java.lang.String name)
```
    Check to see if a string is a valid Name according to [5] in the XML 1.0 Recommendation
    
    Parameters:
    name - string to check
    
    Returns:
    true if name is a valid Name
  - isValidNCName
```
public static boolean isValidNCName(java.lang.String ncName)
```
    Check to see if a string is a valid NCName according to [4] from the XML Namespaces 1.0 Recommendation
    
    Parameters:
    ncName - string to check
    
    Returns:
    true if name is a valid NCName
  - isValidNmtoken
```
public static boolean isValidNmtoken(java.lang.String nmtoken)
```
    Check to see if a string is a valid Nmtoken according to [7] in the XML 1.0 Recommendation
    
    Parameters:
    nmtoken - string to check
    
    Returns:
    true if nmtoken is a valid Nmtoken
  - isValidIANAEncoding
```
public static boolean isValidIANAEncoding(java.lang.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.
  - isValidJavaEncoding
```
public static boolean isValidJavaEncoding(java.lang.String javaEncoding)
```
    Returns true if the encoding name is a valid Java encoding. This method does not verify that there is a decoder available for this encoding, only that the characters are valid for an Java encoding name.
    
    Parameters:
    javaEncoding - The Java encoding name.
  - trim
```
public static java.lang.String trim(java.lang.String value)
```
    Trims space characters as defined by production [3] in the XML 1.0 specification from both ends of the given string.
    
    Parameters:
    value - the string to be trimmed
    
    Returns:
    the given string with the space characters trimmed from both ends

Class XMLChar

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

MASK_VALID

MASK_SPACE

MASK_NAME_START

MASK_NAME

MASK_PUBID

MASK_CONTENT

MASK_NCNAME_START

MASK_NCNAME

Constructor Detail

XMLChar

Method Detail

isSupplemental

supplemental

highSurrogate

lowSurrogate

isHighSurrogate

isLowSurrogate

isValid

isInvalid

isContent

isMarkup

isSpace

isNameStart

isName

isNCNameStart

isNCName

isPubid

isValidName

isValidNCName

isValidNmtoken

isValidIANAEncoding

isValidJavaEncoding

trim