Package org.aksw.commons.util.string

Class Envsubst

java.lang.Object

org.aksw.commons.util.string.Envsubst

public class Envsubst
extends Object

A basic 'envsubst' implementation. Just uses regex matching for substituting placeholders in a string. Does not precompile templates - we may want to switch to a fully fledged template engine for that.

Field Summary

Fields

Modifier and Type	Field	Description
static final Pattern	PLACEHOLDER_PATTERN	Regex for matching strings such as '${varname}' variable names cannot include the '}' symbol

Constructor Summary

Constructors

Constructor	Description
Envsubst()

Method Summary

Modifier and Type	Method	Description
static String	envsubst(String input, Function<String,String> getReplacement)	Perform substitution of placeholders of form "${name}"

Methods inherited from class java.lang.Object

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

Field Details

PLACEHOLDER_PATTERN

public static final Pattern PLACEHOLDER_PATTERN

Regex for matching strings such as '${varname}' variable names cannot include the '}' symbol

Constructor Details

Envsubst

public Envsubst()

Method Details

envsubst

public static String envsubst(String input,
 Function<String,String> getReplacement)

Perform substitution of placeholders of form "${name}"

Parameters:

input - A string in which to replace placeholder patterns

getReplacement - Function that receives the variable name of a match and can return a substitution string. A result of null leaves the placeholder unchanged in order to allow for future substitution.

Returns: