Package org.apache.juneau.svl.vars

Class EnvVariablesVar

java.lang.Object

org.apache.juneau.svl.Var

org.apache.juneau.svl.SimpleVar

org.apache.juneau.svl.DefaultingVar

org.apache.juneau.svl.vars.EnvVariablesVar

public class EnvVariablesVar
extends DefaultingVar

Environment variable variable resolver.

The format for this var is "$E{envVar[,defaultValue]}".

Example:

// Create a variable resolver that resolves environment variables (e.g. "$E{PATH}") VarResolver varResolver = VarResolver.create().vars(EnvVariablesVar.class).build(); // Use it! System.out.println(varResolver.resolve("Environment variable PATH is set to $E{PATH}"));

Since this is a SimpleVar, any variables contained in the result will be recursively resolved.
Likewise, if the arguments contain any variables, those will be resolved before they are passed to this var.

See Also:

• Simple Variable Language Basics

Field Summary

Fields

Modifier and Type	Field	Description
static final String	NAME	The name of this variable.

Constructor Summary

Constructors

Constructor	Description
EnvVariablesVar()	Constructor.

Method Summary

Modifier and Type	Method	Description
String	resolve(VarResolverSession session, String varVal)	The interface that needs to be implemented for subclasses of SimpleVar.

Methods inherited from class org.apache.juneau.svl.DefaultingVar

doResolve

Methods inherited from class org.apache.juneau.svl.SimpleVar

resolveTo

Methods inherited from class org.apache.juneau.svl.Var

allowNested, allowRecurse, canResolve, getName

Methods inherited from class java.lang.Object

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

Field Details

NAME

public static final String NAME

The name of this variable.

See Also:

• Constant Field Values

Constructor Details

EnvVariablesVar

public EnvVariablesVar()

Constructor.

Method Details

resolve

public String resolve(VarResolverSession session,
 String varVal)

Description copied from class: Var

The interface that needs to be implemented for subclasses of SimpleVar.

Specified by:

resolve in class Var

Parameters:

session - The session object used for a single instance of a var resolution.

varVal - The inside argument of the variable.

Returns:

The resolved value.