org.apache.wiki.variables

Interface VariableManager

All Known Implementing Classes:

DefaultVariableManager

public interface VariableManager

Manages variables. Variables are case-insensitive. A list of all available variables is on a Wiki page called "WikiVariables".

Since:

1.9.20.

Field Summary

Fields

Modifier and Type	Field and Description
static String	VAR_ERROR
static String	VAR_MSG
static String	VAR_RUNFILTERS If this variable is set to false, all filters are disabled when translating.

Method Summary

Modifier and Type	Method and Description
String	expandVariables(Context context, String source) This method does in-place expansion of any variables.
String	getValue(Context context, String varName) Returns a value of the named variable.
String	getValue(Context context, String varName, String defValue) Returns the value of a named variable.
String	getVariable(Context context, String name) Shortcut to getValue().
String	parseAndGetValue(Context context, String link) Parses the link and finds a value.

Field Detail

VAR_ERROR

static final String VAR_ERROR

See Also:

Constant Field Values

VAR_MSG

static final String VAR_MSG

See Also:

Constant Field Values

VAR_RUNFILTERS

static final String VAR_RUNFILTERS

If this variable is set to false, all filters are disabled when translating.

See Also:

Constant Field Values

Method Detail

parseAndGetValue

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".

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

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.

Parameters:

context - The WikiContext of the current page.

source - The source string.

Returns:

The source string with variables expanded.

getValue

String getValue(Context context,
                String varName,
                String defValue)

Returns the value of a named variable. See getValue(Context, String). The only difference is that this method does not throw an exception, but it returns the given default value instead.

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

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.

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.

Since:

2.2 on Engine, moved to VariableManager on 2.11.0

getValue

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.

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.