com.hammurapi.config.bootstrap
Class TokenExpander

java.lang.Object
  com.hammurapi.config.bootstrap.TokenExpander

public class TokenExpander
extends Object

Expands tokens like $[myToken] to token values. Nested tokens are supported, i.e. if myToken value contains $[someOtherToken] then it will also be expanded. $[ can be escaped by adding extra $, e.g. $$[ will be replaced with $[. Token can contain default value separated from the token name by pipe, e.g. $[myToken|tokenDefaultValue].

Author:

Pavel Vlasov

Nested Class Summary

static interface

TokenExpander.TokenSource Source of tokens.

Field Summary

static String	TOKEN_CLOSING_CHAR
static String	TOKEN_FIRST_OPENING_CHAR
static String	TOKEN_SECOND_OPENING_CHAR

Constructor Summary

TokenExpander(TokenExpander.TokenSource tokens)
Creates a new instance of PropertyParser

TokenExpander(TokenExpander.TokenSource tokens, char tokenFirstOpeningChar, char tokenSecondOpeningChar, char tokenClosingChar)
Creates a new instance of TokenExpander.

Method Summary

String	expand(String str) Parses a string by replacing occurences of ${<property name>} with property values.
String	expandToken(String token, String defaultValue) Property parsing.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

TOKEN_CLOSING_CHAR

public static final String TOKEN_CLOSING_CHAR

See Also:

Constant Field Values

TOKEN_SECOND_OPENING_CHAR

public static final String TOKEN_SECOND_OPENING_CHAR

See Also:

Constant Field Values

TOKEN_FIRST_OPENING_CHAR

public static final String TOKEN_FIRST_OPENING_CHAR

See Also:

Constant Field Values

Constructor Detail

TokenExpander

public TokenExpander(TokenExpander.TokenSource tokens)

Creates a new instance of PropertyParser

Parameters:

properties - Properties

useNameAsDefault - If true then property name will be used as property default value.

TokenExpander

public TokenExpander(TokenExpander.TokenSource tokens,
                     char tokenFirstOpeningChar,
                     char tokenSecondOpeningChar,
                     char tokenClosingChar)

Creates a new instance of TokenExpander.

Parameters:

tokens -

tokenFirstOpeningChar - Token first opening char. Default is $.

tokenSecondOpeningChar - Token second opening char. Default is {.

tokenClosingChar - Token closing char. Default is }.

Method Detail

expandToken

public String expandToken(String token,
                          String defaultValue)
                   throws ConfigurationException

Property parsing. Replaces string ${<property name>} with property value. If property value contains ${<other property name>} it will be parsed.

Throws:

ConfigurationException

expand

public String expand(String str)
              throws ConfigurationException

Parses a string by replacing occurences of ${<property name>} with property values. If property value contains ${<other property name>} it will be parsed.

Throws:

ConfigurationException