io.micronaut.context.env

Interface PropertyPlaceholderResolver

All Known Subinterfaces:

ApplicationContext

All Known Implementing Classes:

DefaultApplicationContext, DefaultPropertyPlaceholderResolver

public interface PropertyPlaceholderResolver

Interface for implementations that resolve placeholders in configuration and annotations.

Since:

1.0

Author:

Graeme Rocher

Method Summary

Modifier and Type	Method and Description
default String	getPrefix()
Optional<String>	resolvePlaceholders(String str) Resolve the placeholders and return an Optional String if it was possible to resolve them.
default <T> T	resolveRequiredPlaceholder(String str, Class<T> type) Resolves the value of a single placeholder.
default String	resolveRequiredPlaceholders(String str) Resolve the placeholders and return an Optional String if it was possible to resolve them.

Method Detail

resolvePlaceholders

Optional<String> resolvePlaceholders(String str)

Resolve the placeholders and return an Optional String if it was possible to resolve them.

Parameters:

str - The placeholder to resolve

Returns:

The optional string or Optional.empty() if resolution was not possible

getPrefix

@Nonnull
default String getPrefix()

Returns:

The prefix used

resolveRequiredPlaceholders

@Nonnull
default String resolveRequiredPlaceholders(String str)
                                             throws ConfigurationException

Resolve the placeholders and return an Optional String if it was possible to resolve them.

Parameters:

str - The placeholder to resolve

Returns:

The optional string or Optional.empty() if resolution was not possible

Throws:

ConfigurationException - If the placeholders could not be resolved

resolveRequiredPlaceholder

@Nonnull
default <T> T resolveRequiredPlaceholder(String str,
                                                  Class<T> type)
                                           throws ConfigurationException

Resolves the value of a single placeholder.

Type Parameters:

T - The type the value should be converted to

Parameters:

str - The string containing the placeholder

type - The class of the type

Returns:

The resolved value

Throws:

ConfigurationException - If multiple placeholders are found or if the placeholder could not be converted to the requested type