First commit

JawadSourceCde/code/Chapter01/GroovyFileReader

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+f = new File("test.txt")
+f.eachLine{println it}

JawadSourceCde/code/Chapter01/ListSum.groovy

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+class ListSum{
+  public static int sum(list){
+    def result = 0
+    list.each{
+      result += it
+    }
+    return result
+  }
+}
+
+a = [1,2,3,4,5]
+println ListSum.sum(a)

JawadSourceCde/code/Chapter01/Lists.groovy

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+list1 = []; list2 = [];list3 = []
+for (element in 0..9){
+  list1 += element
+  list2 += element + 1
+  list3 += (list1[element] + list2[element]) / 2
+}
+list3.each{
+  println it
+}

JawadSourceCde/code/Chapter01/SubStringTest.groovy

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+assert "Test_String".substring(0,4) == "Test"

JawadSourceCde/code/Chapter01/SubStringTest.java

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+public class SubStringTest {
+  public static void main(String[] args) {
+    System.out.println("Test_String".substring(0,4));
+  }
+}

JawadSourceCde/code/Chapter01/com/apress/groovygrailsrecipes/chap01/SampleFileReader.java

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+package com.apress.groovygrailsrecipes.chap01;
+
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileReader;
+import java.io.IOException;
+
+public class SampleFileReader {
+  static public String readFile(File file) {
+    StringBuffer contents = new StringBuffer();
+    try {
+      BufferedReader reader = new BufferedReader(new FileReader(file));
+      try {
+        String line = null;
+        while ((line = reader.readLine()) != null) {
+          contents.append(line).append
+          (System.getProperty("line.separator"));
+        }
+      } finally {
+        reader.close();
+      }
+    } catch (IOException ex) {
+      contents.append(ex.getMessage());
+      ex.printStackTrace();
+    }
+    return contents.toString();
+  }
+
+  public static void main(String[] args) {
+    File file = new File("test.txt");
+    System.out.println(SampleFileReader.readFile(file));
+  }
+}

JawadSourceCde/code/Chapter01/test.txt

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+Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Duis quis nunc. Etiam mollis velit nec eros. Suspendisse id velit a diam viverra porta. Fusce est lacus, dictum id, hendrerit nec, congue vitae, elit. Nullam vulputate. Quisque ultricies sapien et ipsum. Nunc urna lectus, hendrerit non, semper ut, dapibus et, enim. Ut venenatis faucibus sapien. Pellentesque feugiat, sem eget tincidunt eleifend, quam nulla sodales quam, ut porttitor enim leo in nulla. Proin dolor dolor, faucibus a, vestibulum ut, sagittis lobortis, nisi. Fusce quis justo eu pede dignissim ultricies. Donec vel justo. Vivamus nec sem at ante tincidunt bibendum. Ut ornare. Vivamus dolor. Proin a nunc. Nulla elementum, magna non rutrum euismod, eros lectus molestie lorem, ut ultrices eros neque faucibus nisi. Aenean sed elit id lectus pulvinar porta. Integer leo lectus, condimentum eu, varius eu, molestie ac, risus.
+
+Nam erat neque, rutrum eu, tristique cursus, scelerisque eget, urna. Pellentesque suscipit dolor quis augue. Nunc rutrum leo sit amet elit. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Fusce blandit massa et est. Vivamus orci. Fusce mollis elementum felis. Fusce dignissim, elit id semper scelerisque, justo urna dignissim justo, at euismod urna arcu a dui. Nullam faucibus. Ut volutpat, urna in adipiscing aliquam, nibh mauris ullamcorper orci, sit amet aliquam elit magna nec mi. Ut lacus. Aliquam eget metus ac nibh hendrerit interdum. Quisque massa augue, facilisis vel, tincidunt in, euismod a, ligula. Aenean aliquam sapien in diam aliquam sollicitudin. Pellentesque eget risus vel leo accumsan malesuada. Mauris enim. Vivamus eleifend. Proin accumsan congue velit. Suspendisse quam magna, hendrerit vehicula, pharetra eu, dapibus sit amet, tortor. 

JawadSourceCde/code/Chapter02/Assertions.groovy

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+println "Welcome to $language"
+return "The End"

JawadSourceCde/code/Chapter02/AssertionsCustomError.groovy

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+a = [1,2,3]
+assert a.size() == 2 , "list ${a} must be of size 2"

JawadSourceCde/code/Chapter02/AutomaticConversion

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+int var = 1
+var = 2.7
+assert var == 2
+assert var.class in Integer
+var = '1' as char
+assert var == 49
+assert var.class in Integer

JawadSourceCde/code/Chapter02/CalculateRaise.groovy

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+public class Employee{
+def salary
+public double calculateRaise(c){
+        return c(salary)
+    }
+}
+
+Employee employee1 = new Employee(salary:1000)
+def raise1 = {salary -> (salary * 1.5) }
+assert employee1.calculateRaise(raise1) == 1500
+
+Employee employee2 = new Employee(salary:500)
+def raise2 = {salary -> (salary + 300) }
+assert employee2.calculateRaise(raise2) == 800

JawadSourceCde/code/Chapter02/Closures.groovy

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+//Simple closure with no arguments
+def clos1 = { println "hello world!" }
+//Calling the closure
+clos1()
+
+//A closure with arguments
+def clos2 = {arg1,arg2 -> println arg1+arg2}
+clos2(3,4)
+
+//A closure defined inside a method. The closure is bound to the
+//variables within its scope
+def method1(book){
+    def prefix = "The title of the book is: "
+    return {println prefix + book}
+}
+
+def clos3 = method1("Groovy")
+clos3()

JawadSourceCde/code/Chapter02/DoubleQuotesString.groovy

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+def language = "Groovy"
+def text = "Welcome to $language"
+assert text == "Welcome to Groovy"
+assert text as groovy.lang.GString

JawadSourceCde/code/Chapter02/DynamicTyping.groovy

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+def var = 1
+assert var.class in java.lang.Integer
+var = 'Hello World'    
+assert var.class in java.lang.String

JawadSourceCde/code/Chapter02/FileCreator.java

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+//FileCreator.java:
+
+import java.io.File;
+import java.io.IOException;
+
+public class FileCreator {
+  public static void main (String args[]){
+    File file = new File("C:\\temp\\groovy.txt");
+    try {
+      file.createNewFile();
+    } catch (IOException e) {
+      e.printStackTrace();
+    }
+  }
+}
+

JawadSourceCde/code/Chapter02/GDK.groovy

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+//java.lang.Object
+def a = [1,2,3]
+assert a.any {it > 2} //At least one element satisfies the condition
+assert a.every{it > 0} //All elements must satisfy the condition
+//Iterate over all the elements calling the closure on each item
+assert a.collect{it * 2} == [2,4,6] 
+assert a.findAll{it > 2} == [3] //Finds all elements that satisfy the condition
+a.print(a) //Prints the values of a, can be also written as print(a)
+
+//java.lang.Number
+def x = 10
+assert x.abs() == 10 //Returns absolute value
+assert x.compareTo(3) == 1 //Compares two numbers
+assert x.div(2) == 5 //Divides two numbers
+def total = 0
+x.downto(5) {
+number -> total += number} //Sums the numbers from 10 to 5 inclusive
+assert total == 45 
+total = 0
+x.upto(15){
+number -> total += number} //Sums the numbers from 10 to 15 inclusive
+assert total == 75
+
+//java.io.File
+def f = new File("C:\\temp\\groovy.txt") //Marks a file for creation
+f.text = "Groovy rocks!" //File will be created if it doesn't exist
+assert f.exists()
+assert f.text == "Groovy rocks!"
+f.append("Doesn't?") //Appends text to the file
+assert f.text =="Groovy rocks!Doesn't?"
+f.renameTo(new File("C:\\temp\\groovyRenamed.txt")) //Renames a file
+assert f.name == "groovy.txt" //Files are immutable
+[new File("C:\\temp\\groovy.txt"),new File("C:\\temp\\groovyRenamed.txt")].
+each{it.delete()} //Deletes both files

JawadSourceCde/code/Chapter02/GroovyBeans.groovy

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+class Person{
+String firstName
+String lastName
+def getName(){
+    firstName + ' ' + lastName
+}
+ static void main(args) {
+       def person = new Person()
+       person.firstName = 'Bashar'
+       person.lastName = 'Abdul'
+       assert person.firstName == 'Bashar'
+       assert person.name == 'Bashar Abdul'
+    }
+}

JawadSourceCde/code/Chapter02/GroovyCastException.groovy

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+int var = 1
+assert var as java.lang.Integer
+var = 'Hello World'

JawadSourceCde/code/Chapter02/GroovyClassLoaderExample.java

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+import groovy.lang.GroovyClassLoader;
+import groovy.lang.GroovyObject;
+
+import java.io.File;
+
+public class GroovyClassLoaderExample{
+
+  public static void main(String args[]) {
+    try {
+      GroovyClassLoader loader = new GroovyClassLoader();
+      Class fileCreator = loader.parseClass
+        (new File("GroovySimpleFileCreator.groovy"));
+      GroovyObject object = (GroovyObject) fileCreator.newInstance();
+      object.invokeMethod("createFile", "C:\\temp\\emptyFile.txt");
+    } catch (Exception e) {
+      e.printStackTrace();
+    }
+  }
+}

JawadSourceCde/code/Chapter02/GroovyClassLoaderExample2.java

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+import groovy.lang.GroovyClassLoader;
+import groovy.lang.GroovyObject;
+
+import java.io.File;
+
+public class GroovyClassLoaderExample2{
+
+  public static void main(String args[]) {
+    try {
+      GroovyClassLoader loader = new GroovyClassLoader();
+      Class groovyClass = loader.parseClass(new File("Square.groovy"));
+      GroovyObject object = (GroovyObject) groovyClass.newInstance();
+      object.invokeMethod("setX", 10);
+      Shape shape = (Shape) object;
+      assert shape.calculateArea() == 100;
+    } catch (Exception e) {
+      e.printStackTrace();
+    }
+  }
+}

JawadSourceCde/code/Chapter02/GroovyFileCreator.groovy

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+class GroovyFileCreator {
+  static void main(args) {
+    File file = new File("C:\\temp\\groovy.txt");
+    file.createNewFile();
+  }
+}

JawadSourceCde/code/Chapter02/GroovyJSR223Example.java

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+import javax.script.Invocable;
+import javax.script.ScriptEngine;
+import javax.script.ScriptEngineManager;
+
+public class GroovyJSR223Example {
+
+  public static void main(String args[]) {
+    try {
+      ScriptEngineManager factory = new ScriptEngineManager();
+      ScriptEngine engine = factory.getEngineByName("groovy");
+      String HelloLanguage = "def hello(language) {return \"Hello $language\"}";
+      engine.eval(HelloLanguage);
+      Invocable inv = (Invocable) engine;
+      Object[] params = { new String("Groovy") };
+      Object result = inv.invokeFunction("hello", params);
+      assert result.equals("Hello Groovy");
+    } catch (Exception e) {
+      // TODO Auto-generated catch block
+      e.printStackTrace();
+    }
+  }
+}

JawadSourceCde/code/Chapter02/GroovyScriptEngineExample.java

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+import groovy.lang.Binding;
+import groovy.util.GroovyScriptEngine;
+
+public class GroovyScriptEngineExample {
+
+  public static void main(String args[]) {
+    try {
+      GroovyScriptEngine engine = new GroovyScriptEngine("");
+      Binding binding = new Binding();
+      binding.setVariable("language", "Groovy");
+      Object value = engine.run("SimpleScript.groovy", binding);
+      assert value.equals("The End");
+    } catch (Exception e) {
+      e.printStackTrace();
+    }
+
+  }
+}

JawadSourceCde/code/Chapter02/GroovyShellExample.java

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+import groovy.lang.Binding;
+import groovy.lang.GroovyShell;
+
+public class GroovyShellExample {
+
+  public static void main(String args[]) {
+    Binding binding = new Binding();
+    binding.setVariable("x", 10);
+    binding.setVariable("language", "Groovy");
+    GroovyShell shell = new GroovyShell(binding);
+    Object value = shell.evaluate
+      ("println \"Welcome to $language\"; y = x * 2; z = x * 3; return x ");
+    assert value.equals(10);
+    assert binding.getVariable("y").equals(20);
+    assert binding.getVariable("z").equals(30);
+  }
+}

JawadSourceCde/code/Chapter02/GroovySimpleFileCreator.groovy

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+class GroovySimpleFileCreator {
+  public createFile(String fileName){
+    File file = new File(fileName);
+    file.createNewFile();
+  }
+}

JawadSourceCde/code/Chapter02/Lists.groovy

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+def a = [] //Empty list
+a += [1,2,3] //Adding elements to a list
+assert a == [1,2,3]
+assert a.size == 3
+a << 4 << 5 //Another way of adding elements to a list
+assert a == [1,2,3,4,5]
+a.add(6) //A third way of adding elements to a list
+assert a == [1,2,3,4,5,6]
+
+//Accessing elements of a list
+assert a[0] == 1 //Using a subscript
+assert a.get(0) == 1 //Using get
+assert a.getAt(0) == 1 //Using getAt
+assert a[-1]  == 6 //Last element index starts at -1 backwards
+
+//Modifying elements in a list
+a.putAt(1,1)
+assert a == [1,1,3,4,5,6]
+assert a.set(1,2) == 1 //Will return the old value
+assert a == [1,2,3,4,5,6]
+
+//Iterating over a list
+a.each{ println "$it"}
+//Printing items in a list with their index
+a.eachWithIndex{it, index -> println item : "$it", index : "$index"}
+
+//Removing items from a list
+a -= 1 //Remove number 1
+assert a == [2,3,4,5,6]
+a = a.minus([2,3,4]) //Remove the sublist [2,3,4]
+assert a == [5,6]

JawadSourceCde/code/Chapter02/Maps.groovy

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+//Creating a map
+def map = ['name':'Bashar','age':26,skills:['Java','Groovy'], 'author':true]
+assert map.size() == 4
+
+//Adding a key/value pair to a map
+map += ['city':'Tucson']
+assert map == ['name':'Bashar','age':26,skills:['Java','Groovy'],
+               'author':true, 'city':'Tucson']
+//Alternative way of adding a key/value pair to a map
+map['state'] = 'AZ'
+assert map == ['name':'Bashar','age':26,skills:['Java','Groovy'],
+               'author':true, 'city':'Tucson', 'state':'AZ']
+//Accessing map elements
+assert map.city == 'Tucson'
+assert map['city'] == 'Tucson'
+assert map.get('city') == 'Tucson'
+assert map.getAt('city') == 'Tucson'
+assert map.skills[0] == 'Java'
+
+//Keys are unique
+assert ['name':'Bashar','name':'Abdul'] == ['name':'Abdul']
+
+//Iterating over a map
+map.each{ it -> println it.key + ":" + it.value}
+map.eachWithIndex{ it, index -> println "item $index - " + it.key + ":" + it.value}