public interface JexlContext
JEXL variable names in their simplest form are 'java-like' identifiers. JEXL also considers 'ant' inspired variables expressions as valid. For instance, the expression 'x.y.z' is an 'antish' variable and will be resolved as a whole by the context, i.e. using the key "x.y.z". This proves to be useful to solve "fully qualified class names".
The interpreter variable resolution algorithm will try the different sequences of identifiers till it finds one that exists in the context; if "x" is an object known in the context (JexlContext.has("x") returns true), "x.y" will not be looked up in the context but will most likely refer to "x.getY()".
Note that JEXL may use '$jexl' and '$ujexl' variables for internal purpose; setting or getting those variables may lead to unexpected results unless specified otherwise.
Modifier and Type | Interface and Description |
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static interface |
JexlContext.AnnotationProcessor
A marker interface of the JexlContext that processes annotations.
|
static interface |
JexlContext.CancellationHandle
A marker interface of the JexlContext sharing a cancelling flag.
|
static interface |
JexlContext.ClassNameResolver
A marker interface that solves a simple class name into a fully-qualified one.
|
static interface |
JexlContext.ModuleProcessor
A marker interface of the JexlContext that processes module definitions.
|
static interface |
JexlContext.NamespaceFunctor
A marker interface of the JexlContext, NamespaceFunctor allows creating an instance
to delegate namespace methods calls to.
|
static interface |
JexlContext.NamespaceResolver
A marker interface of the JexlContext that declares how to resolve a namespace from its name;
it is used by the interpreter during evaluation.
|
static interface |
JexlContext.OptionsHandle
A marker interface of the JexlContext that exposes runtime evaluation options.
|
static interface |
JexlContext.PragmaProcessor
A marker interface of the JexlContext that processes pragmas.
|
static interface |
JexlContext.ThreadLocal
A marker interface of the JexlContext that indicates the interpreter to put this context
in the JexlEngine thread local context instance during evaluation.
|
Modifier and Type | Method and Description |
---|---|
Object |
get(String name)
Gets the value of a variable.
|
boolean |
has(String name)
Checks whether a variable is defined in this context.
|
void |
set(String name,
Object value)
Sets the value of a variable.
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