Class ValueExpressionLiteral
- java.lang.Object
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- jakarta.el.Expression
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- jakarta.el.ValueExpression
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- com.sun.el.ValueExpressionLiteral
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- All Implemented Interfaces:
java.io.Externalizable
,java.io.Serializable
public final class ValueExpressionLiteral extends ValueExpression implements java.io.Externalizable
- See Also:
- Serialized Form
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Field Summary
Fields Modifier and Type Field Description private java.lang.Class<?>
expectedType
private static long
serialVersionUID
private java.lang.Object
value
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Constructor Summary
Constructors Constructor Description ValueExpressionLiteral()
ValueExpressionLiteral(java.lang.Object value, java.lang.Class<?> expectedType)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description boolean
equals(ValueExpressionLiteral ve)
boolean
equals(java.lang.Object obj)
Determines whether the specified object is equal to thisExpression
.java.lang.Class<?>
getExpectedType()
Returns the type the result of the expression will be coerced to after evaluation.java.lang.String
getExpressionString()
Returns the original String used to create thisExpression
, unmodified.java.lang.Class<?>
getType(ELContext context)
Evaluates the expression relative to the provided context, and returns the most general type that is acceptable for an object to be passed as thevalue
parameter in a future call to theValueExpression.setValue(jakarta.el.ELContext, java.lang.Object)
method.java.lang.Object
getValue(ELContext context)
Evaluates the expression relative to the provided context, and returns the resulting value.int
hashCode()
Returns the hash code for thisExpression
.boolean
isLiteralText()
Returns whether this expression was created from only literal text.boolean
isReadOnly(ELContext context)
Evaluates the expression relative to the provided context, and returnstrue
if a call toValueExpression.setValue(jakarta.el.ELContext, java.lang.Object)
will always fail.void
readExternal(java.io.ObjectInput in)
void
setValue(ELContext context, java.lang.Object value)
Evaluates the expression relative to the provided context, and sets the result to the provided value.void
writeExternal(java.io.ObjectOutput out)
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Methods inherited from class jakarta.el.ValueExpression
getValueReference
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Field Detail
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serialVersionUID
private static final long serialVersionUID
- See Also:
- Constant Field Values
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value
private java.lang.Object value
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expectedType
private java.lang.Class<?> expectedType
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Method Detail
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getValue
public java.lang.Object getValue(ELContext context)
Description copied from class:ValueExpression
Evaluates the expression relative to the provided context, and returns the resulting value.The resulting value is automatically coerced to the type returned by
getExpectedType()
, which was provided to theExpressionFactory
when this expression was created.- Specified by:
getValue
in classValueExpression
- Parameters:
context
- The context of this evaluation.- Returns:
- The result of the expression evaluation.
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setValue
public void setValue(ELContext context, java.lang.Object value)
Description copied from class:ValueExpression
Evaluates the expression relative to the provided context, and sets the result to the provided value.- Specified by:
setValue
in classValueExpression
- Parameters:
context
- The context of this evaluation.value
- The new value to be set.
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isReadOnly
public boolean isReadOnly(ELContext context)
Description copied from class:ValueExpression
Evaluates the expression relative to the provided context, and returnstrue
if a call toValueExpression.setValue(jakarta.el.ELContext, java.lang.Object)
will always fail.- Specified by:
isReadOnly
in classValueExpression
- Parameters:
context
- The context of this evaluation.- Returns:
true
if the expression is read-only orfalse
if not.
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getType
public java.lang.Class<?> getType(ELContext context)
Description copied from class:ValueExpression
Evaluates the expression relative to the provided context, and returns the most general type that is acceptable for an object to be passed as thevalue
parameter in a future call to theValueExpression.setValue(jakarta.el.ELContext, java.lang.Object)
method.This is not always the same as
getValue().getClass()
. For example, in the case of an expression that references an array element, thegetType
method will return the element type of the array, which might be a superclass of the type of the actual element that is currently in the specified array element.- Specified by:
getType
in classValueExpression
- Parameters:
context
- The context of this evaluation.- Returns:
- the most general acceptable type; otherwise undefined.
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getExpectedType
public java.lang.Class<?> getExpectedType()
Description copied from class:ValueExpression
Returns the type the result of the expression will be coerced to after evaluation.- Specified by:
getExpectedType
in classValueExpression
- Returns:
- the
expectedType
passed to theExpressionFactory.createValueExpression
method that created thisValueExpression
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getExpressionString
public java.lang.String getExpressionString()
Description copied from class:Expression
Returns the original String used to create thisExpression
, 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
.- Specified by:
getExpressionString
in classExpression
- Returns:
- The original expression String.
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equals
public boolean equals(java.lang.Object obj)
Description copied from class:Expression
Determines whether the specified object is equal to thisExpression
.The result is
true
if and only if the argument is notnull
, is anExpression
object that is the of the same type (ValueExpression
orMethodExpression
), 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 correspondingFunctionMapper
s mappedfn1:foo
andfn2:foo
to the same method.- Specified by:
equals
in classExpression
- Parameters:
obj
- theObject
to test for equality.- Returns:
true
ifobj
equals thisExpression
;false
otherwise.- See Also:
Hashtable
,Object.equals(java.lang.Object)
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equals
public boolean equals(ValueExpressionLiteral ve)
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hashCode
public int hashCode()
Description copied from class:Expression
Returns the hash code for thisExpression
.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 theequals(Object)
method, then calling thehashCode
method on each of the two objects must produce the same integer result. Implementations must take special note and implementhashCode
correctly.- Specified by:
hashCode
in classExpression
- Returns:
- The hash code for this
Expression
. - See Also:
Expression.equals(java.lang.Object)
,Hashtable
,Object.hashCode()
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isLiteralText
public boolean isLiteralText()
Description copied from class:Expression
Returns whether this expression was created from only literal text.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#{...}
).- Specified by:
isLiteralText
in classExpression
- Returns:
true
if this expression was created from only literal text;false
otherwise.
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writeExternal
public void writeExternal(java.io.ObjectOutput out) throws java.io.IOException
- Specified by:
writeExternal
in interfacejava.io.Externalizable
- Throws:
java.io.IOException
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readExternal
public void readExternal(java.io.ObjectInput in) throws java.io.IOException, java.lang.ClassNotFoundException
- Specified by:
readExternal
in interfacejava.io.Externalizable
- Throws:
java.io.IOException
java.lang.ClassNotFoundException
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