From b13001c5cc7baaed5bc45937b64efd82c7f15c43 Mon Sep 17 00:00:00 2001
From: Sven Efftinge <sven.efftinge@itemis.de>
Date: Wed, 13 Feb 2013 08:33:22 +0100
Subject: [PATCH] Added samples for Xtend

---
 samples/Xtend/BasicExpressions.xtend | 93 ++++++++++++++++++++++++++++
 samples/Xtend/Movies.xtend           | 60 ++++++++++++++++++
 2 files changed, 153 insertions(+)
 create mode 100644 samples/Xtend/BasicExpressions.xtend
 create mode 100644 samples/Xtend/Movies.xtend

diff --git a/samples/Xtend/BasicExpressions.xtend b/samples/Xtend/BasicExpressions.xtend
new file mode 100644
index 00000000..f6cdb1a3
--- /dev/null
+++ b/samples/Xtend/BasicExpressions.xtend
@@ -0,0 +1,93 @@
+/*******************************************************************************
+ * Copyright (c) 2012 itemis AG (http://www.itemis.eu) and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *******************************************************************************/
+package example2
+
+import org.junit.Test
+import static org.junit.Assert.*
+
+
+class BasicExpressions {
+	
+	@Test def void literals() {
+		// string literals work with single or double quotes
+		assertEquals('Hello', "Hello")
+		
+		// number literals (big decimals in this case)
+		assertEquals(42, 20 + 20 + 1 * 2)
+		assertEquals(42.00bd, 0.00bd + 42bd)
+		
+		// boolean literals
+		assertEquals(true, !false)
+		
+		// class literals
+		assertEquals(getClass(), typeof(BasicExpressions))
+	}
+	
+	@Test def void collections() {
+		// There are various static methods to create collections
+		// and numerous extension methods which make working with them
+		// convenient.
+		val list = newArrayList('Hello', 'World')
+		assertEquals('HELLO', list.map[toUpperCase].head)
+		
+		val set  = newHashSet(1, 3, 5)
+		assertEquals(2, set.filter[ it >= 3].size)
+		
+		val map  = newHashMap('one' -> 1, 'two' -> 2, 'three' -> 3)
+		assertEquals( 2 , map.get('two'))
+	}
+	
+	@Test def void controlStructures() {
+		// 'if' looks like in Java
+		if ('text'.length == 4) {
+			// but it's an expression so it can be used in more flexible ways:
+			assertEquals( 42 , if ('foo' != 'bar') 42 else -24 )
+		} else {
+			fail('Never happens!')
+		}
+		
+		// in a switch the first match wins
+		switch (t : 'text') {
+			// use predicates
+			case t.length > 8 :
+				fail('Never happens!')
+			// use equals
+			case 'text' :
+				assertTrue(true)
+			default :
+				fail('never happens!')
+		}
+		
+		// switch also supports type guards, which provide a safe 
+		// and convenient alternative to Java's 'instanceof'-cascades.
+		val Object someValue = 'a string typed to Object'
+		assertEquals('string', 
+			switch someValue {
+				Number : 'number'
+				String : 'string' 
+			})
+	}
+	
+	@Test def void loops() {
+		// for loop
+		var counter = 1
+		for (i : 1 .. 10) {
+			assertEquals(counter, i)
+			counter = counter + 1
+		}
+		
+		// while loop
+		val iterator = newArrayList(1,2,3,4,5).iterator
+		counter = 1
+		while(iterator.hasNext) {
+			val i = iterator.next
+			assertEquals(counter, i)
+			counter = counter + 1
+		}
+	}
+}
diff --git a/samples/Xtend/Movies.xtend b/samples/Xtend/Movies.xtend
new file mode 100644
index 00000000..f243695f
--- /dev/null
+++ b/samples/Xtend/Movies.xtend
@@ -0,0 +1,60 @@
+/*******************************************************************************
+ * Copyright (c) 2012 itemis AG (http://www.itemis.eu) and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ * 
+ * Author - Sven Efftinge
+ *******************************************************************************/
+package example6
+
+import org.junit.Test
+import static org.junit.Assert.*
+import java.io.FileReader
+import java.util.Set
+import static extension com.google.common.io.CharStreams.*
+
+class Movies {
+	
+	/**
+	 * @return the total number of action movies
+	 */ 
+	@Test def void numberOfActionMovies() {
+		assertEquals(828, movies.filter[categories.contains('Action')].size)
+	}
+	
+	/**
+	 * @return the year the best rated movie of 80ies (1980-1989) was released.
+	 */
+	@Test def void yearOfBestMovieFrom80ies() {
+		assertEquals(1989, movies.filter[(1980..1989).contains(year)].sortBy[rating].last.year)
+	}
+	
+	/**
+	 * @return the sum of the number of votes of the two top rated movies.
+	 */
+	@Test def void sumOfVotesOfTop2() {
+		val long movies = movies.sortBy[-rating].take(2).map[numberOfVotes].reduce[a, b| a + b]
+		assertEquals(47_229, movies)
+	}
+	
+	val movies = new FileReader('data.csv').readLines.map[ line |
+		val segments = line.split('  ').iterator
+		return new Movie(
+			segments.next, 
+			Integer::parseInt(segments.next), 
+			Double::parseDouble(segments.next), 
+			Long::parseLong(segments.next), 
+			segments.toSet
+		)
+	]
+}
+
+@Data class Movie {
+	String title
+	int year
+	double rating
+	long numberOfVotes
+	Set<String> categories 
+}