org.mule.module.apikit.uri

Class TokenVariable

java.lang.Object

org.mule.module.apikit.uri.TokenVariable

All Implemented Interfaces:

Expandable, Matchable, Token

public class TokenVariable
extends Object
implements Token, Matchable

A URI token wrapping a variable.

Variables follow the following expression:

 var         = varname [ "=" vardefault ]
 varname     = (ALPHA / DIGIT)*(ALPHA / DIGIT / "." / "_" / "-" )
 vardefault  = *(unreserved / pct-encoded)
 

Version:

30 December 2008

Author:

Christophe Lauret

Constructor Summary

Constructors

Constructor and Description
TokenVariable(String exp) Creates a new variable token.
TokenVariable(Variable var) Creates a new variable token.

Method Summary

Methods

Modifier and Type	Method and Description
boolean	equals(Object o) Two tokens are equals if and only if their string expression is equal.
String	expand(Parameters variables) Expands this object to produce a URI fragment as defined by the URI Template specifications.
String	expression() The expression corresponding to this token.
Variable	getVariable() Returns the variable wrapped by this token.
int	hashCode()
boolean	isResolvable() Indicates whether this token can be resolved.
boolean	match(String value) Indicates whether this token matches the specified part of a URL.
Pattern	pattern() Returns a regular expression pattern corresponding to this object.
boolean	resolve(String expanded, Map<Variable,Object> values) Resolves the specified expanded URI part for this token.
protected static String	strip(String exp) Removes the curly brackets from the specified expression.
String	toString()
protected static List<Variable>	toVariables(String exp) Returns the variables for a given expression containing a list of variables.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.mule.module.apikit.uri.Token

expression, isResolvable

Constructor Detail

TokenVariable

public TokenVariable(String exp)
              throws NullPointerException,
                     URITemplateSyntaxException

Creates a new variable token.

Parameters:

exp - The expression to create a new.

Throws:

NullPointerException - If the specified expression is null.

URITemplateSyntaxException - If the specified expression could not be parsed as a variable.

TokenVariable

public TokenVariable(Variable var)
              throws NullPointerException

Creates a new variable token.

Parameters:

var - The variable this token corresponds to.

Throws:

NullPointerException - If the specified text is null.

Method Detail

getVariable

public Variable getVariable()

Returns the variable wrapped by this token.

Returns:

The variable wrapped by this token.

expand

public String expand(Parameters variables)

Expands this object to produce a URI fragment as defined by the URI Template specifications.

Specified by:

expand in interface Expandable

Parameters:

variables - The list of parameters and their values for substitution.

Returns:

The expanded URI fragment

match

public boolean match(String value)

Indicates whether this token matches the specified part of a URL.

Specified by:

match in interface Matchable

Parameters:

value - The part of URL to test for matching.

Returns:

true if it matches; false otherwise.

pattern

public Pattern pattern()

Returns a regular expression pattern corresponding to this object.

Specified by:

pattern in interface Matchable

Returns:

The regular expression pattern corresponding to this object.

resolve

public boolean resolve(String expanded,
              Map<Variable,Object> values)

Resolves the specified expanded URI part for this token.

The resolution process requires all variables referenced in the token to be mapped to the value that is present in the expanded URI data.

Specified by:

resolve in interface Token

Parameters:

expanded - The part of the URI that correspond to an expanded version of the token.

values - The variables mapped to their values as a result of resolution.

Returns:

true this operation was successful; false otherwise.

isResolvable

public boolean isResolvable()

Indicates whether this token can be resolved.

A resolvable token contains variables which can be resolved.

By default a token is resolvable if it can be matched.

Specified by:

isResolvable in interface Token

Returns:

true if variables can be resolved from the specified pattern; false otherwise.

expression

public String expression()

The expression corresponding to this token.

Specified by:

expression in interface Token

Returns:

The expression corresponding to this token.

equals

public boolean equals(Object o)

Two tokens are equals if and only if their string expression is equal.

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object

strip

protected static final String strip(String exp)

Removes the curly brackets from the specified expression.

If the expression is already stripped, this method returns the same string.

Parameters:

The - expression to 'strip'.

Returns:

The raw expression (without the curly brackets).

toVariables

protected static final List<Variable> toVariables(String exp)
                                           throws URITemplateSyntaxException

Returns the variables for a given expression containing a list of variables.

Parameters:

exp - An expression containing a comma separated list of variables.

Returns:

A list of variables.

Throws:

URITemplateSyntaxException - If thrown by the Variable parse method.