TDC São Paulo - Palestra: Groovy como você nunca viu

ast.groovy

package tdc.groovy.awesome

import groovy.transform.Immutable
import groovy.transform.ToString

// @TypeChecked
// @CompileStatic

@ToString
@Immutable
class Person {
    String name
    Integer id
}

def p = new Person(id: 1, name: 'Groovy')
p.id = 12 // exception

boilerplate.groovy

package tdc.groovy.awesome;

import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

class Boilerplate {

    public static void main(String[] args) {

        def names = ['Homer', 'Marge', 'Bart', 'Lisa']
        println names

        def b = new Boilerplate();
        def shortNames = names.findAll { name -> name.size() <= 4 }
        def shortNamesStream = names
                .stream()
                .filter {name -> name.length() <= 4}
                .collect(Collectors.toList())

        println shortNames
        println shortNamesStream

    }
}

builders.groovy

package tdc.groovy.awesome

import groovy.json.JsonBuilder
import groovy.xml.MarkupBuilder

// MarkupBuilder
// JSON


def json = new JsonBuilder()
json.eventos {
    evento {
        name 'TDC 2016'
        palestra 'Groovy'
    }
}
println json

dsl.groovy

package tdc.groovy.awesome

import groovy.transform.CompileStatic
import groovy.transform.TypeChecked

// Operator overloading
// Closure Delegate (EmailSender) @DelegatesTo
// Category

class EmailSender {
    def from(String from) { println "From $from"}
    def to(String ...to) { println "To: ${to.join(',')}" }
    def message(String msg) { println "Message: ${msg}"}
}

def email(@DelegatesTo(EmailSender) Closure cls) {
    cls.delegate = new EmailSender()
    cls()
}

@TypeChecked
@CompileStatic
def enviaEmail() {
    email {
        from '[email protected]'
        to '[email protected]'
        message 'Fala ai john!! Blza?!!'
    }
}

java_interop.groovy

package tdc.groovy.awesome

println 'http://www.google.com.br'.toURL().text

println 'ls -l'.execute().text

optional.groovy

package tdc.groovy.awesome

//Optional (Typing, Semicolons, Parentheses, public & return keyword);

def hello(String saudacao) {
    "Bem vindos ao " + saudacao
}

def nomes = ['Dooms', 'Tincas', 'John']
println nomes.class

hello "TDC 2016"

def map = [nome: 'Dooms', lang:'Groovy']
map.each { e ->
    println "${e.key} ${e.value}"
}

(1..10).each { n ->
    println n
}