Package groovy.yaml

Class YamlBuilder

java.lang.Object
groovy.lang.GroovyObjectSupport
groovy.yaml.YamlBuilder
All Implemented Interfaces:
GroovyObject, Writable
public class YamlBuilder extends GroovyObjectSupport implements Writable
A builder for creating YAML payloads.
Since:
3.0.0

  • Constructor Details

    • YamlBuilder

      public YamlBuilder()

  • Method Details

    • getContent

      public Object getContent()

    • call

      public Object call(Map m)
      Named arguments can be passed to the YAML builder instance to create a root YAML object

      Example: 

      
 def yaml = new groovy.yaml.YamlBuilder()
 yaml name: "Guillaume", age: 33

 assert yaml.toString() == '''---
 name: "Guillaume"
 age: 33
 '''
      Parameters:
      m - a map of key / value pairs
      Returns:
      a map of key / value pairs

    • call

      public Object call(List l)
      A list of elements as arguments to the YAML builder creates a root YAML array

      Example: 

      
 def yaml = new groovy.yaml.YamlBuilder()
 def result = yaml([1, 2, 3])

 assert result instanceof List
 assert yaml.toString() == '''---
 - 1
 - 2
 - 3
 '''
      Parameters:
      l - a list of values
      Returns:
      a list of values

    • call

      public Object call(Object... args)
      Varargs elements as arguments to the YAML builder create a root YAML array

      Example: 

      
 def yaml = new groovy.yaml.YamlBuilder()
 def result = yaml 1, 2, 3

 assert result instanceof List
 assert yaml.toString() == '''---
 - 1
 - 2
 - 3
 '''
      Parameters:
      args - an array of values
      Returns:
      a list of values

    • call

      public Object call(Iterable coll, Closure c)
      A collection and closure passed to a YAML builder will create a root YAML array applying the closure to each object in the collection

      Example: 

      
 class Author {
      String name
 }
 def authors = [new Author (name: "Guillaume"), new Author (name: "Jochen"), new Author (name: "Paul")]

 def yaml = new groovy.yaml.YamlBuilder()
 yaml authors, { Author author ->
      name author.name
 }

 assert yaml.toString() == '''---
 - name: "Guillaume"
 - name: "Jochen"
 - name: "Paul"
 '''
      Parameters:
      coll - a collection
      c - a closure used to convert the objects of coll
      Returns:
      a list of values

    • call

      public Object call(Collection coll, Closure c)
      Delegates to call(Iterable, Closure)
      Parameters:
      coll -
      c -

    • call

      public Object call(Closure c)
      A closure passed to a YAML builder will create a root YAML object

      Example: 

      
 def yaml = new groovy.yaml.YamlBuilder()
 def result = yaml {
      name "Guillaume"
      age 33
 }

 assert result instanceof Map
 assert yaml.toString() == '''---
 name: "Guillaume"
 age: 33
 '''
      Parameters:
      c - a closure whose method call statements represent key / values of a YAML object
      Returns:
      a map of key / value pairs

    • invokeMethod

      public Object invokeMethod(String name, Object args)
      A method call on the YAML builder instance will create a root object with only one key whose name is the name of the method being called. This method takes as arguments:
      • a closure
      • a map (ie. named arguments)
      • a map and a closure
      • or no argument at all

      Example with a classical builder-style: 

      
 def yaml = new groovy.yaml.YamlBuilder()
 def result = yaml.person {
      name "Guillaume"
      age 33
 }

 assert result instanceof Map
 assert yaml.toString() == '''---
 person:
   name: "Guillaume"
   age: 33
 '''
      Or alternatively with a method call taking named arguments: 
      
 def yaml = new groovy.yaml.YamlBuilder()
 yaml.person name: "Guillaume", age: 33

 assert yaml.toString() == '''---
 person:
   name: "Guillaume"
   age: 33
 '''
      If you use named arguments and a closure as last argument, the key/value pairs of the map (as named arguments) and the key/value pairs represented in the closure will be merged together — the closure properties overriding the map key/values in case the same key is used. 
      
 def yaml = new groovy.yaml.YamlBuilder()
 yaml.person(name: "Guillaume", age: 33) { town "Paris" }

 assert yaml.toString() == '''---
 person:
   name: "Guillaume"
   age: 33
   town: "Paris"
 '''
      The empty args call will create a key whose value will be an empty YAML object: 
      
 def yaml = new groovy.yaml.YamlBuilder()
 yaml.person()

 assert yaml.toString() == '''---
 person: {}
 '''
      Specified by:
      invokeMethod in interface GroovyObject
      Parameters:
      name - the single key
      args - the value associated with the key
      Returns:
      a map with a single key

    • toString

      public String toString()
      Serializes the internal data structure built with the builder to a conformant YAML payload string

      Example: 

      
 def yaml = new groovy.yaml.YamlBuilder()
 yaml { temperature 37 }

 assert yaml.toString() == '''---
 temperature: 37
 '''
      Overrides:
      toString in class Object
      Returns:
      a YAML output

    • writeTo

      public Writer writeTo(Writer out) throws IOException
      The YAML builder implements the Writable interface, so that you can have the builder serialize itself the YAML payload to a writer.

      Example: 

      
 def yaml = new groovy.yaml.YamlBuilder()
 yaml { temperature 37 }

 def out = new StringWriter()
 out << yaml

 assert out.toString() == '''---
 temperature: 37
 '''
      Specified by:
      writeTo in interface Writable
      Parameters:
      out - a writer on which to serialize the YAML payload
      Returns:
      the writer
      Throws:
      IOException - if an error occurred while outputting data to the writer