org.yaml.snakeyaml.env

Class EnvScalarConstructor

java.lang.Object

org.yaml.snakeyaml.constructor.BaseConstructor

org.yaml.snakeyaml.constructor.SafeConstructor

org.yaml.snakeyaml.constructor.Constructor

org.yaml.snakeyaml.env.EnvScalarConstructor

public class EnvScalarConstructor
extends Constructor

Construct scalar for format ${VARIABLE} replacing the template with the value from environment.

See Also:

Variable substitution, Variable substitution

Nested Class Summary

Nested classes/interfaces inherited from class org.yaml.snakeyaml.constructor.Constructor

Constructor.ConstructMapping, Constructor.ConstructScalar, Constructor.ConstructSequence, Constructor.ConstructYamlObject

Nested classes/interfaces inherited from class org.yaml.snakeyaml.constructor.SafeConstructor

SafeConstructor.ConstructUndefined, SafeConstructor.ConstructYamlBinary, SafeConstructor.ConstructYamlBool, SafeConstructor.ConstructYamlFloat, SafeConstructor.ConstructYamlInt, SafeConstructor.ConstructYamlMap, SafeConstructor.ConstructYamlNull, SafeConstructor.ConstructYamlOmap, SafeConstructor.ConstructYamlPairs, SafeConstructor.ConstructYamlSeq, SafeConstructor.ConstructYamlSet, SafeConstructor.ConstructYamlStr, SafeConstructor.ConstructYamlTimestamp

Field Summary

Fields

Modifier and Type	Field and Description
static Pattern	ENV_FORMAT
static Tag	ENV_TAG

Fields inherited from class org.yaml.snakeyaml.constructor.SafeConstructor

undefinedConstructor

Fields inherited from class org.yaml.snakeyaml.constructor.BaseConstructor

composer, loadingConfig, rootTag, typeDefinitions, typeTags, yamlClassConstructors, yamlConstructors, yamlMultiConstructors

Constructor Summary

Constructors

Constructor and Description
EnvScalarConstructor()

Method Summary

Methods

Modifier and Type	Method and Description
String	apply(String name, String separator, String value, String environment) Implement the logic for missing and unset variables
String	getEnv(String key) Get value of the environment variable

Methods inherited from class org.yaml.snakeyaml.constructor.Constructor

getClassForName, getClassForNode

Methods inherited from class org.yaml.snakeyaml.constructor.SafeConstructor

constructMapping2ndStep, constructSet2ndStep, createLongOrBigInteger, flattenMapping, processDuplicateKeys

Methods inherited from class org.yaml.snakeyaml.constructor.BaseConstructor

addTypeDescription, checkData, constructArray, constructArrayStep2, constructDocument, constructMapping, constructObject, constructObjectNoCheck, constructScalar, constructSequence, constructSequenceStep2, constructSet, constructSet, createArray, createDefaultList, createDefaultMap, createDefaultSet, finalizeConstruction, getConstructor, getData, getPropertyUtils, getSingleData, isAllowDuplicateKeys, isExplicitPropertyUtils, isWrappedToRootException, newInstance, newInstance, newInstance, newList, newMap, newSet, postponeMapFilling, postponeSetFilling, setAllowDuplicateKeys, setComposer, setPropertyUtils, setWrappedToRootException

Methods inherited from class java.lang.Object

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

Field Detail

ENV_TAG

public static final Tag ENV_TAG

ENV_FORMAT

public static final Pattern ENV_FORMAT

Constructor Detail

EnvScalarConstructor

public EnvScalarConstructor()

Method Detail

apply

public String apply(String name,
           String separator,
           String value,
           String environment)

Implement the logic for missing and unset variables

Parameters:

name - - variable name in the template

separator - - separator in the template, can be :-, -, :?, ?

value - - default value or the error in the template

environment - - the value from environment for the provided variable

Returns:

the value to apply in the template

getEnv

public String getEnv(String key)

Get value of the environment variable

Parameters:

key - - the name of the variable

Returns:

value or null if not set