freemarker.template.expression
Class HashLiteral

java.lang.Object
  freemarker.template.expression.HashLiteral

All Implemented Interfaces:

Expression, java.io.Serializable

public final class HashLiteral
extends java.lang.Object
implements Expression, java.io.Serializable

Represents a literal Hash model in a FM-Classic template. The hash model is not evaluated until run time, since the model may contain variables or other more complex expressions that can't be determined at compile time.

Version:

$Id: HashLiteral.java 1101 2013-04-01 04:17:32Z run2000 $

See Also:

Serialized Form

Constructor Summary

HashLiteral(java.util.List<Expression> values)
Constructor that takes a list of Expression elements to be evaluated as a hash model at run time.

Method Summary

boolean	equals(java.lang.Object o) Determines whether this object is equal to the given object.
TemplateModel	getAsTemplateModel(TemplateWriteableHashModel modelRoot) The TemplateModel value of this Expression.
java.util.Set<ExpressionUtils.ExpressionType>	getType() Determine the type of result that can be calculated by this expression.
int	hashCode() Returns the hash code for this operator.
boolean	isComplete() Has the HashLiteral been populated?
boolean	isConstant() Determine whether result calculated by this expression is a constant value.
Expression	resolveExpression() Resolves the current expression, possibly into a different expression object.
java.lang.String	toString() Returns a string representation of the object.

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

HashLiteral

public HashLiteral(java.util.List<Expression> values)

Constructor that takes a list of Expression elements to be evaluated as a hash model at run time.

Parameters:

values - the values to be added to the HashLiteral

Throws:

java.lang.NullPointerException - the value list is null

java.lang.IllegalArgumentException - there are an odd number of arguments in the value list

Method Detail

getAsTemplateModel

public TemplateModel getAsTemplateModel(TemplateWriteableHashModel modelRoot)
                                 throws TemplateException

The TemplateModel value of this Expression.

Specified by:

getAsTemplateModel in interface Expression

Parameters:

modelRoot - the template model that will be evaluated by the expression

Returns:

a FastHash containing the values in the hash model

Throws:

TemplateException - the expression could not be evaluated for some reason

isComplete

public boolean isComplete()

Has the HashLiteral been populated?

Specified by:

isComplete in interface Expression

Returns:

true if the HashLiteral is populated, otherwise false

getType

public java.util.Set<ExpressionUtils.ExpressionType> getType()

Determine the type of result that can be calculated by this expression. This is in the form of an integer constant ored together from values in the ExpressionUtils class.

Specified by:

getType in interface Expression

isConstant

public boolean isConstant()

Determine whether result calculated by this expression is a constant value.

Specified by:

isConstant in interface Expression

toString

public java.lang.String toString()

Returns a string representation of the object.

Overrides:

toString in class java.lang.Object

Returns:

a String representation of this expression

equals

public boolean equals(java.lang.Object o)

Determines whether this object is equal to the given object.

Overrides:

equals in class java.lang.Object

Parameters:

o - the object to be compared with

Returns:

true if the objects are equal, otherwise false

hashCode

public int hashCode()

Returns the hash code for this operator.

Overrides:

hashCode in class java.lang.Object

Returns:

the hash code of this object

resolveExpression

public Expression resolveExpression()
                             throws TemplateException

Resolves the current expression, possibly into a different expression object. This is loosely equivalent to the serialization protocol's readResolve method. Situations where this may be used are:

• Caching frequently-used expression objects
• Evaluating constant expressions, and returning a constant reference

Specified by:

resolveExpression in interface Expression

Throws:

TemplateException