org.apache.karaf.util

Class InterpolationHelper

java.lang.Object

org.apache.karaf.util.InterpolationHelper

public class InterpolationHelper
extends Object

Enhancement of the standard Properties managing the maintain of comments, etc.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	InterpolationHelper.SubstitutionCallback Callback for substitution

Method Summary

Methods

Modifier and Type	Method and Description
static void	performSubstitution(Map<String,String> properties) Perform substitution on a property set
static void	performSubstitution(Map<String,String> properties, org.osgi.framework.BundleContext context) Perform substitution on a property set
static void	performSubstitution(Map<String,String> properties, InterpolationHelper.SubstitutionCallback callback) Perform substitution on a property set
static String	substVars(String val, String currentKey, Map<String,String> cycleMap, Map<String,String> configProps, InterpolationHelper.SubstitutionCallback callback) This method performs property variable substitution on the specified value.

Methods inherited from class java.lang.Object

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

Method Detail

performSubstitution

public static void performSubstitution(Map<String,String> properties)

Perform substitution on a property set

Parameters:

properties - the property set to perform substitution on

performSubstitution

public static void performSubstitution(Map<String,String> properties,
                       org.osgi.framework.BundleContext context)

Perform substitution on a property set

Parameters:

properties - the property set to perform substitution on

performSubstitution

public static void performSubstitution(Map<String,String> properties,
                       InterpolationHelper.SubstitutionCallback callback)

Perform substitution on a property set

Parameters:

properties - the property set to perform substitution on

substVars

public static String substVars(String val,
               String currentKey,
               Map<String,String> cycleMap,
               Map<String,String> configProps,
               InterpolationHelper.SubstitutionCallback callback)
                        throws IllegalArgumentException

This method performs property variable substitution on the specified value. If the specified value contains the syntax ${<prop-name>}, where <prop-name> refers to either a configuration property or a system property, then the corresponding property value is substituted for the variable placeholder. Multiple variable placeholders may exist in the specified value as well as nested variable placeholders, which are substituted from inner most to outer most. Configuration properties override system properties.

Parameters:

val - The string on which to perform property substitution.

currentKey - The key of the property being evaluated used to detect cycles.

cycleMap - Map of variable references used to detect nested cycles.

configProps - Set of configuration properties.

callback - the callback to obtain substitution values

Returns:

The value of the specified string after system property substitution.

Throws:

IllegalArgumentException - If there was a syntax error in the property placeholder syntax or a recursive variable reference.