@Beta @GwtCompatible public abstract class UnicodeEscaper extends EscaperAn
Escaperthat converts literal text into a format safe for inclusion in a particular context (such as an XML document). Typically (but not always), the inverse process of "unescaping" the text is performed automatically by the relevant parser.
For example, an XML escaper would convert the literal string
"<Bar>"from being confused with an XML tag. When the resulting XML document is parsed, the parser API will return this text as the original literal string
Note: This class is similar to
CharEscaperbut with one very important difference. A CharEscaper can only process Java UTF16 characters in isolation and may not cope when it encounters surrogate pairs. This class facilitates the correct escaping of all Unicode characters.
As there are important reasons, including potential security issues, to handle Unicode correctly if you are considering implementing a new escaper you should favor using UnicodeEscaper wherever possible.
UnicodeEscaperinstance is required to be stateless, and safe when used concurrently by multiple threads.
Several popular escapers are defined as constants in classes like
SourceCodeEscapers. To create your own escapers extend this class and implement the
All Methods Instance Methods Concrete Methods Modifier and Type Method Description
escape(String string)Returns the escaped form of a given literal string.
escapeReturns the escaped form of a given literal string.
If you are escaping input in arbitrary successive chunks, then it is not generally safe to use this method. If an input string ends with an unmatched high surrogate character, then this method will throw
IllegalArgumentException. You should ensure your input is valid UTF-16 before calling this method.
Note: When implementing an escaper it is a good idea to override this method for efficiency by inlining the implementation of
nextEscapeIndex(CharSequence, int, int)directly. Doing this for
PercentEscapermore than doubled the performance for unescaped strings (as measured by