# Class CharsetMapper

java.lang.Object
org.apache.catalina.util.CharsetMapper

public class CharsetMapper extends Object
Utility class that attempts to map from a Locale to the corresponding character set to be used for interpreting input text (or generating output text) when the Content-Type header does not include one. You can customize the behavior of this class by modifying the mapping data it loads, or by subclassing it (to change the algorithm) and then using your own version for a particular web application.

Author:
  Craig R. McClanahan

- ## Field Summary

  Fields
  Modifier and Type
  Field
  Description
  `static final String`
  `DEFAULT_RESOURCE`
  Default properties resource name.

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `CharsetMapper()`
  Construct a new CharsetMapper using the default properties resource.
  `CharsetMapper(String name)`
  Construct a new CharsetMapper using the specified properties resource.

- ## Method Summary

  Modifier and Type
  Method
  Description
  `void`
  `addCharsetMappingFromDeploymentDescriptor(String locale, String charset)`
  The deployment descriptor can have a locale-encoding-mapping-list element which describes the webapp's desired mapping from locale to charset.
  `String`
  `getCharset(Locale locale)`
  Calculate the name of a character set to be assumed, given the specified Locale and the absence of a character set specified as part of the content type header.

  ### Methods inherited from class java.lang.Object

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

- ## Field Details

  - ### DEFAULT_RESOURCE

    public static final String DEFAULT_RESOURCE
    Default properties resource name.
    See Also:
      - Constant Field Values

- ## Constructor Details

  - ### CharsetMapper

    public CharsetMapper()
    Construct a new CharsetMapper using the default properties resource.

  - ### CharsetMapper

    public CharsetMapper(String name)
    Construct a new CharsetMapper using the specified properties resource.
    Parameters:
      `name` - Name of a properties resource to be loaded
    Throws:
      `IllegalArgumentException` - if the specified properties resource could not be loaded for any reason.

- ## Method Details

  - ### getCharset

    public String getCharset(Locale locale)
    Calculate the name of a character set to be assumed, given the specified Locale and the absence of a character set specified as part of the content type header.
    Parameters:
      `locale` - The locale for which to calculate a character set
    Returns:
      the charset name

  - ### addCharsetMappingFromDeploymentDescriptor

    public void addCharsetMappingFromDeploymentDescriptor(String locale, String charset)
    The deployment descriptor can have a locale-encoding-mapping-list element which describes the webapp's desired mapping from locale to charset. This method gets called when processing the web.xml file for a context
    Parameters:
      `locale` - The locale for a character set
      `charset` - The charset to be associated with the locale