public abstract class ForwardingMethodExpression extends MethodExpression
Constructor and Description |
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ForwardingMethodExpression() |
Modifier and Type | Method and Description |
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protected abstract MethodExpression |
delegate() |
boolean |
equals(Object obj)
Determines whether the specified object is equal to this
Expression . |
String |
getExpressionString()
Returns the original String used to create this
Expression ,
unmodified. |
MethodInfo |
getMethodInfo(ELContext context)
Evaluates the expression relative to the provided context, and
returns information about the actual referenced method.
|
int |
hashCode()
Returns the hash code for this
Expression . |
Object |
invoke(ELContext context,
Object[] params)
If a String literal is specified as the expression, returns the
String literal coerced to the expected return type of the method
signature.
|
boolean |
isLiteralText()
Returns whether this expression was created from only literal text.
|
boolean |
isParametersProvided()
Return whether this MethodExpression was created with parameters.
|
boolean |
isParmetersProvided()
Deprecated.
|
String |
toString() |
protected abstract MethodExpression delegate()
public MethodInfo getMethodInfo(ELContext context)
MethodExpression
getMethodInfo
in class MethodExpression
context
- The context of this evaluationMethodInfo
containing information
about the method the expression evaluated to.public Object invoke(ELContext context, Object[] params)
MethodExpression
ELException
is thrown if
expectedReturnType
is void or if the coercion of the String literal
to the expectedReturnType
yields an error (see Section "1.18 Type
Conversion" of the EL specification).
If not a String literal, evaluates the expression
relative to the provided context, invokes the method that was
found using the supplied parameters, and returns the result of
the method invocation.
Any parameters passed to this method is ignored if isLiteralText()
or isParmetersProvided() is true.invoke
in class MethodExpression
context
- The context of this evaluation.params
- The parameters to pass to the method, or
null
if no parameters.null
if
the method has a void
return type).public String getExpressionString()
Expression
Expression
,
unmodified.
This is used for debugging purposes but also for the purposes of comparison (e.g. to ensure the expression in a configuration file has not changed).
This method does not provide sufficient information to
re-create an expression. Two different expressions can have exactly
the same expression string but different function mappings.
Serialization should be used to save and restore the state of an
Expression
.
getExpressionString
in class Expression
public boolean isLiteralText()
Expression
This method must return true
if and only if the
expression string this expression was created from contained no
unescaped EL delimeters (${...}
or
#{...}
).
isLiteralText
in class Expression
true
if this expression was created from only
literal text; false
otherwise.public boolean equals(Object obj)
Expression
Expression
.
The result is true
if and only if the argument is
not null
, is an Expression
object that
is the of the same type (ValueExpression
or
MethodExpression
), and has an identical parsed
representation.
Note that two expressions can be equal if their expression
Strings are different. For example, ${fn1:foo()}
and ${fn2:foo()}
are equal if their corresponding
FunctionMapper
s mapped fn1:foo
and
fn2:foo
to the same method.
equals
in class Expression
obj
- the Object
to test for equality.true
if obj
equals this
Expression
; false
otherwise.Hashtable
,
Object.equals(java.lang.Object)
public boolean isParametersProvided()
MethodExpression
This method must return true
if and only if
parameters are specified in the EL, using the
expr-a.expr-b(...) syntax.
isParametersProvided
in class MethodExpression
true
if the MethodExpression was created with
parameters, false
otherwise.@Deprecated public boolean isParmetersProvided()
MethodExpression
isParmetersProvided
in class MethodExpression
public int hashCode()
Expression
Expression
.
See the note in the Expression.equals(java.lang.Object)
method on how two expressions
can be equal if their expression Strings are different. Recall that
if two objects are equal according to the equals(Object)
method, then calling the hashCode
method on each of the
two objects must produce the same integer result. Implementations must
take special note and implement hashCode
correctly.
hashCode
in class Expression
Expression
.Expression.equals(java.lang.Object)
,
Hashtable
,
Object.hashCode()
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