Package org.apache.wiki.variables

Class DefaultVariableManager

java.lang.Object
org.apache.wiki.variables.DefaultVariableManager
All Implemented Interfaces:
VariableManager
public class DefaultVariableManager
extends Object
implements VariableManager
Manages variables. Variables are case-insensitive. A list of all available variables is on a Wiki page called "WikiVariables".
Since:
1.9.20.

  • Constructor Details

    • DefaultVariableManager

      public DefaultVariableManager​(Properties props)
      Creates a VariableManager object using the property list given.
      Parameters:
      props - The properties.

  • Method Details

    • parseAndGetValue

      public String parseAndGetValue​(Context context, String link) throws IllegalArgumentException, NoSuchVariableException
      Parses the link and finds a value. This is essentially used once LinkParsingOperations#isVariableLink(String) has found that the link text actually contains a variable. For example, you could pass in "{$username}" and get back "JanneJalkanen".
      Specified by:
      parseAndGetValue in interface VariableManager
      Parameters:
      context - The WikiContext
      link - The link text containing the variable name.
      Returns:
      The variable value.
      Throws:
      IllegalArgumentException - If the format is not valid (does not start with "{$", is zero length, etc.)
      NoSuchVariableException - If a variable is not known.

    • expandVariables

      public String expandVariables​(Context context, String source)
      This method does in-place expansion of any variables. However, the expansion is not done twice, that is, a variable containing text $variable will not be expanded.

      The variables should be in the same format ({$variablename} as in the web pages.

      Specified by:
      expandVariables in interface VariableManager
      Parameters:
      context - The WikiContext of the current page.
      source - The source string.
      Returns:
      The source string with variables expanded.

    • getValue

      public String getValue​(Context context, String varName, String defValue)
      Returns the value of a named variable. See VariableManager.getValue(Context, String). The only difference is that this method does not throw an exception, but it returns the given default value instead.
      Specified by:
      getValue in interface VariableManager
      Parameters:
      context - WikiContext
      varName - The name of the variable
      defValue - A default value.
      Returns:
      The variable value, or if not found, the default value.

    • getVariable

      public String getVariable​(Context context, String name)
      Shortcut to getValue(). However, this method does not throw a NoSuchVariableException, but returns null in case the variable does not exist.
      Specified by:
      getVariable in interface VariableManager
      Parameters:
      context - WikiContext to look the variable in
      name - Name of the variable to look for
      Returns:
      Variable value, or null, if there is no such variable.

    • getValue

      public String getValue​(Context context, String varName) throws IllegalArgumentException, NoSuchVariableException
      Returns a value of the named variable. The resolving order is
      1. Known "constant" name, such as "pagename", etc. This is so that pages could not override certain constants.
      2. WikiContext local variable. This allows a programmer to set a parameter which cannot be overridden by user.
      3. HTTP Session
      4. HTTP Request parameters
      5. WikiPage variable. As set by the user with the SET directive.
      6. jspwiki.properties
      Use this method only whenever you really need to have a parameter that can be overridden by anyone using the wiki.
      Specified by:
      getValue in interface VariableManager
      Parameters:
      context - The WikiContext
      varName - Name of the variable.
      Returns:
      The variable value.
      Throws:
      IllegalArgumentException - If the name is somehow broken.
      NoSuchVariableException - If a variable is not known.