Working with Builders ObjectGraphBuilder in Groovy Scripting groovy training telugu 64

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//objgraph.groovy

import groovy.transform.ToString

@ToString(includeNames = true)

class Book{

    String title

    String summary

    List<Section> sections =[]

}

@ToString(includeNames = true)

class Section{

    String title

    List<Chapter> chapters =[]

}

@ToString(includeNames = true)

class Chapter{

    String title

}

//Java Style

/*public Book createBook(){

    Book b=new Book();

    b.setTitle("My Book")

    b.setSummary("My Summary")

    Section s =new Section();

    s.setTitle("Section 1")

    Chapter c1=new Chapter();

    c1.setTitle("Chapter 1");

    Chapter c2=new Chapter();

    c2.setTitle("Chapter 2");

    s.addChapters(c1,c2);

    b.getSections().add(s)

    return book;

   }

 */

ObjectGraphBuilder builder= new ObjectGraphBuilder()

def book= builder.book(

    title:"Groovy is Action ",

    summary:"Groovy is  section "){

    section(title:"Section 1"){

        chapter(title:"Chapter 1")

        chapter(title:"Chapter 2")

        chapter(title:"Chapter 3")

    }

    section(title:"Section 2"){

        chapter(title:"Chapter 4")

        chapter(title:"Chapter 5")

        chapter(title:"Chapter 6")

    }

}

println book

Working with Builders JsonBuilder in Groovy Scripting groovy training telugu 63

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//json.groovy

import groovy.json.JsonBuilder

JsonBuilder builder =new JsonBuilder()

builder.books{

    currentBook{

        title'The 4 Hour Work week'

        isbn'978-7888-88899'

        author(first:'Timothy',last:'Ferriss', twitter:'@tferriss')

        related'The 4 hour Body ,the 4 hour chef'

    }

    nextBook{

        title'#AskGaryvee'

        isbn'978-7888-889904-4556'

        author(first:'Gary',last:'Vaynerchuck', twitter:'@garyvee')

        related'Jab,Jab,Jab,Right Hook'

    }

}

println builder.toString()

println builder.toPrettyString()

Working with Builders MarkupBuilder Exercise in Groovy Scripting groovy training telugu 62

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[Exercise] MarkupBuilder

XML

Use the MarkupBuilder to generate the following XML

<books>

    <book isbn="978-1935182443">

        <title>Groovy in Action 2nd Edition</title>

        <author>Dierk Koenig</author>

        <price>50.58</price>

    </book>

    <book isbn="978-1935182948">

        <title>Making Java Groovy</title>

        <author>Ken Kousen</author>

        <price>33.96</price>

    </book>

    <book isbn="978-1937785307">

        <title>Programming Groovy 2: Dynamic Productivity for the Java Developer</title>

        <author>Venkat Subramaniam</author>

        <price>28.92</price>

    </book>

</books>

HTML

With the same data from the xml version build an HTML page that lists that data.

Bonus

Using a FileWriter write the contents of the HTML from the MarkupBuilder to a file.

//CODE

//html.groovy

import groovy.xml.MarkupBuilder

def books =[

        [isbn:"978-1935182443",title:"Groovy in Action 2nd Edition",author:"Dierk Koeting",priece:50.58],

        [isbn:"978-1935182948",title:"Making Java Groovy",author:"Ken Kousen",priece:33.96],

        [isbn:"978-1937785307",title:"Programming Groovy 2:Dynamic Productivity for the Java Developer",author:"Venkat Subramaniam",priece:28.92]

]

MarkupBuilder builder = new MarkupBuilder()

builder.html{

    head{

        title("My Favorite Books")

    }

    body{

        h1("My Favorite Books")

        table{

            tr{

                th("ISBN")

                th("Title")

                th("Author")

                th("Price")

            }

            books.each {book ->

                tr{

                    td(book.isbon)

                    td(book.title)

                    td(book.author)

                    td(book.price)

                }

            }

        }

    }

}

//xml.groovy

import groovy.xml.MarkupBuilder

MarkupBuilder builder=new MarkupBuilder()

builder.books{

    book(isbn: "978-1935182443"){

        title("Groovy in Action 2nd Edition")

        author("Dierk Koeting")

        price("50.58")

    }

    book(isbn: "978-1935182948"){

        title("Making Java Groovy")

        author("Ken Kousen")

        price("33.96")

    }

    book(isbn: "978-1937785307"){

        title("Programming Groovy 2:Dynamic Productivity for the Java Developer")

        author("Venkat Subramaniam")

        price("28.92")

    }

}

Working with Builders MarkupBuilder HTML in Groovy Scripting groovy training telugu 61

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html.groovy

import groovy.xml.MarkupBuilder

MarkupBuilder builder= new MarkupBuilder()

List courses =[

        [id:1, name:'Apache Groovy'],

        [id:2, name:'java']

]

builder.html{

    head{

        title'About Rashmi'

        description  'This is an about me page'

        keywords'Rashmi ,Groovy, Java'

    }

    body{

        h1'About Me'

        p'This is a bunch of text about me........'

        section{

            h2 'About Me'

            table{

                tr{

                    th 'id'

                    th'name'

                }

              courses.each {course ->

                  tr{

                      td course.id

                      td course.name

                  }

              }

            }

        }

    }

}

Working with Builders MarkupBuilder XML in Groovy Scripting groovy training telugu 60

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xml.groovy

import groovy.xml.MarkupBuilder

MarkupBuilder builder=new MarkupBuilder()

builder.omitEmptyAttributes= true

builder.omitNullAttributes=true

builder.sports{

    sport(id:1){

        name'Baseball'

    }

    sport(id:2){

        name'Basketball'

    }

    sport(id:3){

        name'Football'

    }

    sport(id:4){

        name'Hockey'

    }

    sport(id:null,foo:''){

        name:''

    }

}

Compile Time Meta Programming Exercise in Groovy Scripting groovy training telugu 59

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------------------------------------------------------------------

[Exercise] AST Transformations

AST Transformations

We looking at a lot of AST Transformations in this section. 

Now I want you to go through the documentation and 

find one that we didn't look at and see if you can get it to work on

 your own.

//Person.groovy

package clone

import groovy.transform.AutoClone

@AutoClone

class Person {

    String first

    String last

    List favItems

    Date since

}

//clonedemo.groovy

package clone

def p = new Person(first:'John', last:'Smith', favItems:['ipod', 'shiraz'], since:new Date())

def p2 = p.clone()

assert p instanceof Cloneable

assert p.favItems instanceof Cloneable

assert p.since instanceof Cloneable

assert !(p.first instanceof Cloneable)

assert !p.is(p2)

assert !p.favItems.is(p2.favItems)

assert !p.since.is(p2.since)

assert p.first.is(p2.first)

Compile Time Meta Programming @Builder in Groovy Scripting groovy training telugu 58

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//Developer

package builder

import groovy.transform.ToString

import groovy.transform.builder.Builder

@Builder

@ToString(includeNames = true)

class Developer {

    String firstName

    String lastName

    String middleInitial

    String email

    Date hireDate

    List languages

}

//default.groovy

package builder

Developer dan =Developer

    .builder()

    .firstName("Dan")

    .lastName("Vega")

    .middleInitial("A")

    .email("danvega@gmail.com")

    .hireDate(new Date())

    .languages(["java","Groovy"])

    .build()

println dan

assert dan.firstName="Dan"

assert dan.lastName="Vega"

assert dan.languages.size()==2

Compile Time Meta Programming @CompileStatic in Groovy Scripting groovy training telugu 57

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import groovy.transform.CompileStatic

import groovy.transform.TypeChecked

import groovy.transform.TypeCheckinMode

@CompileStatic

class SomeClass

{

String foo()

}

String bar()

{

}

@CompileStatic(TypeCheckingMode.SKIP)

void noReturn(){

}

}

Compile Time Meta Programming @Typechecked in Groovy Scripting groovy training telugu 56

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package TypeChecked

import groovy.transform.TypeChecked

@TypeChecked

class Person {

    String firstname

    String lastname

    String getFullName(){

        "$firstname $lastname"

    }

}

Compile Time Meta Programming @Immutable in Groovy Scripting groovy training telugu 55

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//Person.groovy

package Immutable

import groovy.transform.Immutable

import groovy.transform.ToString

@ToString

@Immutable

class Person {

    String first

    String last

}

//app.groovy

package Immutable

Person p= new Person(first:"Dan",last:"vega")

println p.toString()

p.first ="Andy"

Compile Time Meta Programming @Sortable in Groovy Scripting groovy training telugu 54

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//Person.groovy

package theraldanvega

import groovy.transform.Canonical

import groovy.transform.Sortable

@Sortable(includes = ['last','first'])

@Canonical

class Person {

    String first

    String last

}

//app.groovy

package theraldanvega

Person p1=new Person("Katie","Vega")

Person p2=new Person("Dan","Vega")

Person p3=new Person("andy","Vega")

Person p4=new Person("Jan","Vega")

Person p5=new Person("Jason","NotaVega")

def vegas=[p1,p2,p3,p4,p5]

println vegas.toSorted()

Compile Time Meta Programming @Singleton in Groovy Scripting groovy training telugu 53

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//DatabaseConnection.groovy

@Singleton

class DatabaseConnection {

}

//app.groovy

DatabaseConnection db =new DatabaseConnection()

println db

Compile Time Meta Programming @Canonical in Groovy Scripting groovy training telugu 52

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http://docs.groovy-lang.org/latest/html/gapi/index.html?groovy/lang/Range

//app.groovy

Person p1= new Person("Dan","vega","danvega@gmail.com")

Person p2= new Person("Dan","vega","danvega@gmail.com")

assert p1==p2

println p.toString()

//Person.groovy

import groovy.transform.Canonical

@Canonical

class Person{

String first

String last

String email

}

Compile Time Meta Programming @Tuple Constructor in Groovy Scripting groovy training telugu 51

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http://docs.groovy-lang.org/latest/html/gapi/index.html?groovy/lang/Range

//app.groovy

Person p= new Person("Dan","vega","danvega@gmail.com")

println p.toString()

//Person.groocy

import groovy.transform.ToString

import groovy.transform.TupleConstructor

@ToString

@TupleConstructor

class Person{

String first

String last

String email

}

Compile Time Meta Programming @EqualsAndHashCode in Groovy Scripting groovy training telugu 50

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http://docs.groovy-lang.org/latest/html/gapi/index.html?groovy/lang/Range

//Person.groovy

import groovy.transform.EqualsAndHashCode

@EqualsAndHashCode(exludes =["email"])

class Person {

String first

String last

String email

}

//app.groovy

Person p1= new Person(first:"Dan",last:"vega",email:"danvega@gmail.com")

Person p2= new Person(first:"Dan",last:"vega",email:"danvega@gmail.com")

assert p1==p2

Compile Time Meta Programming @ToString in Groovy Scripting groovy training telugu 49

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//Person.groovy

import groovy.transform.ToString

@ToString(includeNames = true, excludes =['email'])

class Person {

    String first

    String last

    String email

   

    }

//app.groovy

Person p= new Person(first:"Dan",last:"vega",email:"danvega@gmail.com")

println p.toString()

Exercise Runtime Metaprogrammings in Groovy Scripting groovy training telugu 48

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[Exercise] Runtime Metaprogramming

GroovyObject

Create a class and implement each of the following methods from the GroovyObject Interface

invokeMethod

getProperty

setProperty

Expando

Create an Expando Class

Add some properties and methods to it

Knowing that a class's metaclass is an expando to create your own class and add properties and methods to it.

Times Two

Add a new method to the Integer class called `timesTwo`

This method should be available to any instance of Integer

What is another approach that we can take to create this method that would be a little more controlled?

 

//Code

//Developer.groovy

class Developer{

String first

String last

String email

List languages

Developer(){

}

def invokeMethod(String name,Object args){

println "invokeMethod()called with args $args"

}

defgetProperty(String property){

println"getProperty called..."

metaClass.getProperty(this,property)

}

void setProperty(String property,Object newValue){

println"setProperty() called with name $property and newValue $newValue"

metaClass.setProperty(this,property,newValue)

}

}

//GroovyObjectDemo.groovy

Developer developer = newDeveloper(first:"Dan",last:"Vega",email:"danvega@gmail.com")

developer.writeCode("Groovy")

println developer.first

developer.languages=["Groovy","Java]

//ExpandoDemo.groovy

Expando e = new Expando()

e.first="Dan"

e.last="Vega"

e.email="danvega@gmail.com"

e.getFullName={

"$first,$last"

}

println e.toString()

println e.getFullName()

@groovy.transform.ToString(includeNames =true)

class Person {

String first,last

}

Person p=new Person(first:"Dan,last:"Vega")

p.metaClass.email="danvega@gmail.com"

println p

println p.email

//SquaredDemo.groovy

Integer.metaClass.timesTwo={delegate *2}

println 2.timesTwo()

println 4.timesTwo()

println 5.timesTwo()

println 6.timesTwo()

MetaProgramming Intercept Cache Invoke Patternin Groovy Scripting groovy training telugu 47

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//InterceptCacheInvoke.groovy

class Developer{

List languages =[]

def methodMissing(String name, args){

println "${name}() method was called..."

if(name.startsWith('write')){

String language = name.split("write")[1]

if(languages.contains(language)){

def impl ={Object [] theArgs ->

"I like to write code in $language"

}

getMetaClass()."$name"=impl

return impl(args)

}

}

}

}

Developer dan =new Developer()

dan.languages << "Groovy"

dan.languages << "Java"

println dan.metaClass.method.size()

dan.writeGroovy()

dan.writeGroovy()

dan.writeGroovy()

println dan.metaClass.method.size()

dan.writeJava()

dan.writeJava()

dan.writeJava()

println dan.metaClass.method.size()

MetaProgramming Category Class in Groovy Scripting groovy training telugu 46

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//catDemo.groovy

package therealdanvega

//String.metaClass.shout={-> toUpperCase()}

//println "Hello World!".shout()

use(StringCategory){

println "Hello,World!".shout()

}

println "Hello,World!".shout()

//StringCategory.groovvy

package therealdanvega

class StringCategory{

static String shout(String str){

str.toUpperCase()

}

}

//time.groovy

package therealdanvega

import groovy.time.TimeCategory

use(TimeCategory){

println 1.minute.from.now

println 10.hour.ago

def someDate=new Date()

println someDate -3.months

}

MetaProgramming Meta Class in Groovy Scripting groovy training telugu 45

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package therealdanvega

//meta class

//Expando e= new Expando()

//e.name='Dan'

//e.writeCode={-> println "$nsme loves to write code....."}

//e.writeCode

class Developer{

}

Developer dan= new Developer()

dan.metaClass.name="Dan"

dan.metaClass.wrutwCode={-> println "$name loves to write code...."}

dan.writeCode()

String.metaClass.shout={-> toUpperCase()}

println"hello dan".shout()

MetaProgramming Customizing the MOP in Groovy Scripting groovy training telugu 44

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------------------------------------------------------------------------------------------------------------------

//InvokeDemo.groovy

package therealdnvega

//this method is called when the method you called is not present in the groovy

class InvokeDemo{

def invokeMethod(String name,Object args){

return"called invokeMethod $name $args"

}

def test(){

return "method exists"

}

}

def invokeDemo = new InvokeDemo()

assert invokeDemo.test()=="method exists"

assert invokeDemo.someMethod()=="called invokeMEthod someMethod[]"

//GetPropertyDemo.groovy

package therealdnvega

class PropertyDemo{

def prop1="prop1"

def prop2="prop2"

def prop3="prop3"

def getProperty(String name){

println "getProperty() called with argumeny $name"

// return

if(metaClass.getProperty(this,name)){

return metaClass.getProperty(this,name)

}

else{

println "less do something fun with this property"

return "party time....

}

}

}

def pd=new PropertyDemo()

println pd.prop1

println pd.prop2

println pd.prop3

println pd.prop4

MetaProgramming Meta Object Protocol in Groovy Scripting groovy training telugu 43

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Object Oriented Programming Exercise in Groovy Scripting groovy training telugu 42

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[Exercise] What makes up a class

Tweet

We are going to create a class that represents a single tweet.

This is an exercise both about code and starting to think about what

goes into building a class. There is no right or wrong answer here 

so don't be afraid to build your class how you see fit. I will go 

over in the review what I was thinking about when I built mine but 

again my answer is not the right one. 

What properties and methods go into building a tweet class? 

Bonus Points

How could you extract mentions and hashtags from the post text? 

class Tweet{

String post

String username

Date postDateTime

private List favorites=[]

private List retweets=[]

private List mentions=[]

private List hashtags=[]

void favorite(String username){

favorites<<username

}

List getFavorites(){

favorites

}

void retweets(String username){

retweets << username

}

List getRetweets(){

retweets

}

}

Tweet tweet= new Tweet(post:"This Groovy Course is Awesome",username:"@therealdanvega",postDateTime:new Date())

println tweet

tweet.favorite("@ApacheGroovy")

tweet.retweet("@ApacheGroovy")

println tweet.getFavorites()

println tweet.getRetweets()

Object Oriented Programming Groovy Beans in Groovy Scripting groovy training telugu 41

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