io.undertow.predicate

Class PredicateParser

java.lang.Object

io.undertow.predicate.PredicateParser

public class PredicateParser
extends Object

Parser that can build a predicate from a string representation. The underlying syntax is quite simple, and example is shown below:

path["/MyPath"] or (method[value="POST"] and not headersPresent[value={Content-Type, "Content-Encoding"}, ignoreTrailer=true]

The following boolean operators are built in, listed in order or precedence: - not - and - or

They work pretty much as you would expect them to. All other tokens are taken to be predicate names. If the predicate does not require any parameters then the brackets can be omitted, otherwise they are mandatory.

If a predicate is only being passed a single parameter then the parameter name can be omitted. Strings can be enclosed in optional double or single quotations marks, and quotation marks can be escaped using \".

Array types are represented via a comma separated list of values enclosed in curly braces.

TODO: should we use antlr (or whatever) here? I don't really want an extra dependency just for this...

Author:

Stuart Douglas

Constructor Summary

Constructors

Constructor and Description
PredicateParser()

Method Summary

Modifier and Type	Method and Description
static Predicate	parse(String string, ClassLoader classLoader)

Methods inherited from class java.lang.Object

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

Constructor Detail

PredicateParser

public PredicateParser()

Method Detail

parse

public static final Predicate parse(String string,
                                    ClassLoader classLoader)