public class MethodExpressionLiteral extends MethodExpression implements Externalizable
Constructor and Description |
---|
MethodExpressionLiteral() |
MethodExpressionLiteral(String expr,
Class<?> expectedType,
Class<?>[] paramTypes) |
Modifier and Type | Method and Description |
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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.
|
void |
readExternal(ObjectInput in) |
void |
writeExternal(ObjectOutput out) |
isParametersProvided, isParmetersProvided
public MethodInfo getMethodInfo(ELContext context) throws ELException
MethodExpression
getMethodInfo
in class MethodExpression
context
- The context of this evaluationMethodInfo
containing information about the method the expression evaluated to.PropertyNotFoundException
- if one of the property resolutions failed because a specified variable or property
does not exist or is not readable.MethodNotFoundException
- if no suitable method can be found.ELException
- if an exception was thrown while performing property or variable resolution. The thrown exception
must be included as the cause property of this exception, if available.public Object invoke(ELContext context, Object[] params) throws ELException
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 Jakarta Expression Language 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).PropertyNotFoundException
- if one of the property resolutions failed because a specified variable or property
does not exist or is not readable.MethodNotFoundException
- if no suitable method can be found.ELException
- if a String literal is specified and expectedReturnType of the MethodExpression is void or if the
coercion of the String literal to the expectedReturnType yields an error (see Section "1.18 Type Conversion").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 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 ${fn2:foo()}
are equal if their corresponding FunctionMapper
s
mapped fn1:foo
and fn2:foo
to the same method.
equals
in class Expression
obj
- the Object
to test for equality.true
if obj
equals this Expression
; false
otherwise.Hashtable
,
Object.equals(java.lang.Object)
public int hashCode()
Expression
Expression
.
See the note in the Expression.equals(java.lang.Object)
method on how two expressions can be equal if their expression Strings are
different. Recall that if two objects are equal according to the equals(Object)
method, then calling the
hashCode
method on each of the two objects must produce the same integer result. Implementations must
take special note and implement hashCode
correctly.
hashCode
in class Expression
Expression
.Expression.equals(java.lang.Object)
,
Hashtable
,
Object.hashCode()
public boolean isLiteralText()
Expression
This method must return true
if and only if the expression string this expression was created from
contained no unescaped Jakarta Expression Language delimeters (${...}
or #{...}
).
isLiteralText
in class Expression
true
if this expression was created from only literal text; false
otherwise.public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException
readExternal
in interface Externalizable
IOException
ClassNotFoundException
public void writeExternal(ObjectOutput out) throws IOException
writeExternal
in interface Externalizable
IOException
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