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16.40. Text Encoder Interface

We've seen the NamespaceRegistry in the execution context, but we've haven't yet talked about the TextEncoder interface. A TextEncoder merely does what you'd expect: it encodes the characters in a string using some implementation-specific algorithm. ModeShape provides a number of TextEncoder implementations, including:
  • The Jsr283Encoder escapes characters that are not allowed in JCR names, per the JSR-283 specification. Specifically, these are the '*', '/', ':', '[', ']', and '|' characters, which are escaped by replacing them with the Unicode characters U+F02A, U+F02F, U+F03A, U+F05B, U+F05D, and U+F07C, respectively.
  • The NoOpEncoder does no conversion.
  • The UrlEncoder converts text to be used within the different parts of a URL, as defined by Section 2.3 of RFC 2396. Note that this class does not encode a complete URL (since java.net.URLEncoder and java.net.URLDecoder should be used for such purposes).
  • The XmlNameEncoder converts any UTF-16 unicode character that is not a valid XML name character according to the World Wide Web Consortium (W3C) Extensible Markup Language (XML) 1.0 (Fourth Edition) Recommendation, escaping such characters as _xHHHH_, where HHHH stands for the four-digit hexadecimal UTF-16 unicode value for the character in the most significant bit first order. For example, the name "Customer_ID" is encoded as "Customer_x0020_ID".
  • The XmlValueEncoder escapes characters that are not allowed in XML values. Specifically, these are the '&', '<', '>', '"', and ''', which are all escaped to "&amp;", '&lt;', '&gt;', '&quot;', and '&#039;'.
  • The FileNameEncoder escapes characters that are not allowed in file names on Linux, OS X, or Windows XP. Unsafe characters are escaped as described in the UrlEncoder.
  • The SecureHashTextEncoder performs a secure hash of the input text and returns that hash as the encoded text. This encoder can be configured to use different secure hash algorithms and to return a fixed number of characters from the hash.
All of these classes also implement the TextDecoder interface, which defines a method that decodes an encoded string using the opposite transformation.
Of course, you can provide alternative implementations, and supply them to the appropriate getString(...) methods as required.
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