public abstract class Expression extends Object implements Serializable
ValueExpression
and MethodExpression
, implementing characteristics common to both. All expressions must implement the equals() and hashCode()
methods so that two expressions can be compared for equality. They are redefined abstract in this class to force their implementation in subclasses. All expressions must also be Serializable so
that they can be saved and restored. Expressions are also designed to be immutable so that only one instance needs to be created for any given expression String / FunctionMapper
. This
allows a container to pre-create expressions and not have to reparse them each time they are evaluated.Constructor and Description |
---|
Expression() |
Modifier and Type | Method and Description |
---|---|
abstract boolean |
equals(Object obj)
Determines whether the specified object is equal to this Expression.
|
abstract String |
getExpressionString()
Returns the original String used to create this Expression, unmodified.
|
abstract int |
hashCode()
Returns the hash code for this Expression.
|
abstract boolean |
isLiteralText()
Returns whether this expression was created from only literal text.
|
public abstract boolean equals(Object obj)
public abstract String getExpressionString()
public abstract int hashCode()
equals(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 Object
equals(Object)
,
Hashtable
,
Object.hashCode()
public abstract boolean isLiteralText()
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