freemarker.template.expression
Class Dot

java.lang.Object
  freemarker.template.expression.Dot

All Implemented Interfaces:

Expression, Operator, Unary, Variable, java.io.Serializable

public final class Dot
extends java.lang.Object
implements Unary, Variable, java.io.Serializable

The dot operator. Used to reference items inside a TemplateHashModel. It associates with other Variable expressions to its left.

Version:

$Id: Dot.java 1153 2013-04-15 10:59:37Z run2000 $

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from interface freemarker.template.expression.Unary

Unary.Association

Constructor Summary

Dot(Identifier id)
Create a new Dot instruction.

Method Summary

boolean	equals(java.lang.Object o) Determines whether this object is equal to the given object.
Unary.Association	getAssociationType() Retrieve the operator association for this operator.
TemplateModel	getAsTemplateModel(TemplateWriteableHashModel modelRoot) The TemplateModel value of this Expression.
java.lang.String	getName(TemplateWriteableHashModel modelRoot) Retrieve the name of this portion of the variable.
ExpressionBuilder.Precedence	getPrecedence() Return the precedence for this operator to the caller.
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() Are both the target and the identifier specified?
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.
void	setTarget(Expression target) Sets the target of this Dot operator.
void	setTemplateModel(TemplateWriteableHashModel modelRoot, TemplateModel value) Implements a write of the given value to a writeable hash model.
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

Dot

public Dot(Identifier id)

Create a new Dot instruction.

Parameters:

id - the identifier to the right of the dot.

Throws:

java.lang.NullPointerException - the identifier is null

Method Detail

getName

public java.lang.String getName(TemplateWriteableHashModel modelRoot)

Retrieve the name of this portion of the variable.

Specified by:

getName in interface Variable

Parameters:

modelRoot - the model to be used in cases where the variable is the result of an Expression.

isComplete

public boolean isComplete()

Are both the target and the identifier specified?

Specified by:

isComplete in interface Expression

Returns:

true if the target and identifier are both specified, 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

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

Throws:

TemplateException - the expression could not be evaluated for some reason

setTemplateModel

public void setTemplateModel(TemplateWriteableHashModel modelRoot,
                             TemplateModel value)
                      throws TemplateException

Implements a write of the given value to a writeable hash model.

Specified by:

setTemplateModel in interface Variable

Parameters:

modelRoot - the root model, for determining context

value - the value to be assigned

Throws:

TemplateException - there was a problem performing the assignment

getAssociationType

public Unary.Association getAssociationType()

Retrieve the operator association for this operator.

Specified by:

getAssociationType in interface Unary

Returns:

POSTFIX.

setTarget

public void setTarget(Expression target)

Sets the target of this Dot operator.

Specified by:

setTarget in interface Unary

Throws:

java.lang.IllegalArgumentException - the target is of the wrong type for this operator.

getPrecedence

public ExpressionBuilder.Precedence getPrecedence()

Return the precedence for this operator to the caller. Used for associating operators according to precedence.

Specified by:

getPrecedence in interface Operator

Returns:

an enumeration indicating the precedence of this operator

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()

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