public abstract class ExpressionSupport extends Object implements Expression
ExpressionSupport
an abstract base class for Expression implementations
which provides default implementations of some of the
typesafe evaluation methods.
Modifier and Type | Field and Description |
---|---|
protected static Iterator |
EMPTY_ITERATOR |
NULL
Constructor and Description |
---|
ExpressionSupport() |
Modifier and Type | Method and Description |
---|---|
boolean |
evaluateAsBoolean(JellyContext context)
Evaluates the expression with the given context
coercing the result to be a boolean.
|
Iterator |
evaluateAsIterator(JellyContext context)
Evaluates the expression with the given context
coercing the result to be an Iterator.
|
String |
evaluateAsString(JellyContext context)
Evaluates the expression with the given context
coercing the result to be a String.
|
Object |
evaluateRecurse(JellyContext context)
This method evaluates the expression until a value (a non-Expression) object
is returned.
|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
evaluate, getExpressionText
protected static final Iterator EMPTY_ITERATOR
public String evaluateAsString(JellyContext context)
Expression
evaluateAsString
in interface Expression
public Object evaluateRecurse(JellyContext context)
Expression
Sometimes when Jelly is used inside Maven the value of an expression can actually be another expression. For example if a properties file is read, the values of variables can actually be expressions themselves.
e.g. ${foo.bar} can lookup "foo.bar" in a Maven context which could actually be another expression.
So using this method, nested expressions can be evaluated to the actual underlying value object.
evaluateRecurse
in interface Expression
public boolean evaluateAsBoolean(JellyContext context)
Expression
evaluateAsBoolean
in interface Expression
public Iterator evaluateAsIterator(JellyContext context)
Expression
evaluateAsIterator
in interface Expression
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