org.springframework.util

Class PropertyPlaceholderHelper

java.lang.Object

org.springframework.util.PropertyPlaceholderHelper

public class PropertyPlaceholderHelper
extends Object

Utility class for working with Strings that have placeholder values in them. A placeholder takes the form ${name}. Using PropertyPlaceholderHelper these placeholders can be substituted for user-supplied values.

Values for substitution can be supplied using a Properties instance or using a PropertyPlaceholderHelper.PlaceholderResolver.

Since:

3.0

Author:

Juergen Hoeller, Rob Harrop

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	PropertyPlaceholderHelper.PlaceholderResolver Strategy interface used to resolve replacement values for placeholders contained in Strings.

Constructor Summary

Constructors

Constructor and Description
PropertyPlaceholderHelper(String placeholderPrefix, String placeholderSuffix) Creates a new PropertyPlaceholderHelper that uses the supplied prefix and suffix.
PropertyPlaceholderHelper(String placeholderPrefix, String placeholderSuffix, String valueSeparator, boolean ignoreUnresolvablePlaceholders) Creates a new PropertyPlaceholderHelper that uses the supplied prefix and suffix.

Method Summary

Modifier and Type	Method and Description
protected String	parseStringValue(String value, PropertyPlaceholderHelper.PlaceholderResolver placeholderResolver, Set<String> visitedPlaceholders)
String	replacePlaceholders(String value, Properties properties) Replaces all placeholders of format ${name} with the corresponding property from the supplied Properties.
String	replacePlaceholders(String value, PropertyPlaceholderHelper.PlaceholderResolver placeholderResolver) Replaces all placeholders of format ${name} with the value returned from the supplied PropertyPlaceholderHelper.PlaceholderResolver.

Methods inherited from class java.lang.Object

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

Constructor Detail

PropertyPlaceholderHelper

public PropertyPlaceholderHelper(String placeholderPrefix,
                                 String placeholderSuffix)

Creates a new PropertyPlaceholderHelper that uses the supplied prefix and suffix. Unresolvable placeholders are ignored.

Parameters:

placeholderPrefix - the prefix that denotes the start of a placeholder

placeholderSuffix - the suffix that denotes the end of a placeholder

PropertyPlaceholderHelper

public PropertyPlaceholderHelper(String placeholderPrefix,
                                 String placeholderSuffix,
                                 @Nullable
                                 String valueSeparator,
                                 boolean ignoreUnresolvablePlaceholders)

Creates a new PropertyPlaceholderHelper that uses the supplied prefix and suffix.

Parameters:

placeholderPrefix - the prefix that denotes the start of a placeholder

placeholderSuffix - the suffix that denotes the end of a placeholder

valueSeparator - the separating character between the placeholder variable and the associated default value, if any

ignoreUnresolvablePlaceholders - indicates whether unresolvable placeholders should be ignored (true) or cause an exception (false)

Method Detail

replacePlaceholders

public String replacePlaceholders(String value,
                                  Properties properties)

Replaces all placeholders of format ${name} with the corresponding property from the supplied Properties.

Parameters:

value - the value containing the placeholders to be replaced

properties - the Properties to use for replacement

Returns:

the supplied value with placeholders replaced inline

replacePlaceholders

public String replacePlaceholders(String value,
                                  PropertyPlaceholderHelper.PlaceholderResolver placeholderResolver)

Replaces all placeholders of format ${name} with the value returned from the supplied PropertyPlaceholderHelper.PlaceholderResolver.

Parameters:

value - the value containing the placeholders to be replaced

placeholderResolver - the PlaceholderResolver to use for replacement

Returns:

the supplied value with placeholders replaced inline

parseStringValue

protected String parseStringValue(String value,
                                  PropertyPlaceholderHelper.PlaceholderResolver placeholderResolver,
                                  Set<String> visitedPlaceholders)