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java.lang.Objectjavax.el.Expression
javax.el.MethodExpression
org.apache.el.MethodExpressionLiteral
public class MethodExpressionLiteral
Constructor Summary | |
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MethodExpressionLiteral()
|
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MethodExpressionLiteral(java.lang.String expr,
java.lang.Class expectedType,
java.lang.Class[] paramTypes)
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Method Summary | |
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boolean |
equals(java.lang.Object obj)
Determines whether the specified object is equal to this Expression . |
java.lang.String |
getExpressionString()
Returns the original String used to create this Expression ,
unmodified. |
javax.el.MethodInfo |
getMethodInfo(javax.el.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 . |
java.lang.Object |
invoke(javax.el.ELContext context,
java.lang.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(java.io.ObjectInput in)
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void |
writeExternal(java.io.ObjectOutput out)
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Methods inherited from class javax.el.MethodExpression |
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isParmetersProvided |
Methods inherited from class java.lang.Object |
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clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public MethodExpressionLiteral()
public MethodExpressionLiteral(java.lang.String expr, java.lang.Class expectedType, java.lang.Class[] paramTypes)
Method Detail |
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public javax.el.MethodInfo getMethodInfo(javax.el.ELContext context) throws javax.el.ELException
javax.el.MethodExpression
getMethodInfo
in class javax.el.MethodExpression
context
- The context of this evaluation
MethodInfo
containing information
about the method the expression evaluated to.
javax.el.PropertyNotFoundException
- if one of the property
resolutions failed because a specified variable or property
does not exist or is not readable.
javax.el.MethodNotFoundException
- if no suitable method can be found.
javax.el.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 java.lang.Object invoke(javax.el.ELContext context, java.lang.Object[] params) throws javax.el.ELException
javax.el.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 isParametersProvided() is true.
invoke
in class javax.el.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).
javax.el.PropertyNotFoundException
- if one of the property
resolutions failed because a specified variable or property
does not exist or is not readable.
javax.el.MethodNotFoundException
- if no suitable method can be found.
javax.el.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 java.lang.String getExpressionString()
javax.el.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 javax.el.Expression
public boolean equals(java.lang.Object obj)
javax.el.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 ${fn2:foo()}
are equal if their corresponding
FunctionMapper
s mapped fn1:foo
and
fn2:foo
to the same method.
equals
in class javax.el.Expression
obj
- the Object
to test for equality.
true
if obj
equals this
Expression
; false
otherwise.Hashtable
,
Object.equals(java.lang.Object)
public int hashCode()
javax.el.Expression
Expression
.
See the note in the Expression.equals(java.lang.Object)
method on how two expressions
can be equal if their expression Strings are different. Recall that
if two objects are equal according to the equals(Object)
method, then calling the hashCode
method on each of the
two objects must produce the same integer result. Implementations must
take special note and implement hashCode
correctly.
hashCode
in class javax.el.Expression
Expression
.Expression.equals(java.lang.Object)
,
Hashtable
,
Object.hashCode()
public boolean isLiteralText()
javax.el.Expression
This method must return true
if and only if the
expression string this expression was created from contained no
unescaped EL delimeters (${...}
or
#{...}
).
isLiteralText
in class javax.el.Expression
true
if this expression was created from only
literal text; false
otherwise.public void readExternal(java.io.ObjectInput in) throws java.io.IOException, java.lang.ClassNotFoundException
readExternal
in interface java.io.Externalizable
java.io.IOException
java.lang.ClassNotFoundException
public void writeExternal(java.io.ObjectOutput out) throws java.io.IOException
writeExternal
in interface java.io.Externalizable
java.io.IOException
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