isogram : add to track (#311)

* dibs: I will implement exercise isogram

* isogram: add to track

* isogram: add to track

* improve Isogram implementation

* Isogram: adjust API to use instance methods

* Improve Isogram implementation

config.json

   "language": "Java",
   "repository": "https://github.com/exercism/xjava",
   "active": true,
+
   "exercises": [
     {
       "slug": "hello-world",
       "slug": "ocr-numbers",
       "difficulty": 1,
       "topics": []
+    },
+    {
+      "slug": "isogram",
+      "difficulty": 1,
+      "topics": []
     }
   ],
   "deprecated": [
     "say"
   ]
 }
+

exercises/isogram/build.gradle

+apply plugin: "java"
+apply plugin: "eclipse"
+apply plugin: "idea"
+
+repositories {
+  mavenCentral()
+}
+
+dependencies {
+  testCompile "junit:junit:4.12"
+}
+test {
+  testLogging {
+    exceptionFormat = 'full'
+    events = ["passed", "failed", "skipped"]
+  }
+}

exercises/isogram/src/example/java/IsogramChecker.java

+package example;
+
+import java.util.HashSet;
+import java.util.Set;
+import static java.util.Arrays.stream;
+import static java.util.stream.Collectors.joining;
+
+public class IsogramChecker {
+	
+	public IsogramChecker(){
+	}
+	
+	public boolean isIsogram(String word){
+		
+		Set<Character> charSet = new HashSet<>();
+		
+		String[] words = word.split(" ");
+		String newWord = concat(words);
+		
+		words = newWord.split("-");
+		newWord = concat(words).toLowerCase();
+		
+		for(int i = 0; i < newWord.length(); i++){
+			charSet.add(newWord.charAt(i));
+		}
+		
+		return charSet.size() == newWord.length();
+	}
+	
+	private String concat(String[] words){
+		return stream(words).collect(joining());
+	}
+	
+}

exercises/isogram/src/test/java/IsogramTest.java

+package test;
+
+import static org.junit.Assert.*;
+
+import org.junit.Ignore;
+import org.junit.Test;
+import example.IsogramChecker;
+
+public class IsogramTest {
+
+	@Test
+	public void testIsogram() {
+		IsogramChecker iso = new IsogramChecker();
+		assertTrue(iso.isIsogram("duplicates"));
+	}
+	
+	@Ignore
+	@Test
+	public void testNotIsogram() {
+		IsogramChecker iso = new IsogramChecker();
+		assertFalse(iso.isIsogram("eleven"));
+	}
+	
+	@Ignore
+	@Test
+	public void testMediumLongIsogram() {
+		IsogramChecker iso = new IsogramChecker();
+		assertTrue(iso.isIsogram("subdermatoglyphic"));
+	}
+	
+	@Ignore
+	@Test
+	public void testCaseInsensitive() {
+		IsogramChecker iso = new IsogramChecker();
+		assertFalse(iso.isIsogram("Alphabet"));
+	}
+	
+	@Ignore
+	@Test
+	public void testIsogramWithHyphen() {
+		IsogramChecker iso = new IsogramChecker();
+		assertTrue(iso.isIsogram("thumbscrew-japingly"));
+	}
+	
+	@Ignore
+	@Test
+	public void testIgnoresMultipleHyphens() {
+		IsogramChecker iso = new IsogramChecker();
+		assertTrue(iso.isIsogram("Hjelmqvist-Gryb-Zock-Pfund-Wax"));
+	}
+	
+	@Ignore
+	@Test
+	public void testWorksWithGermanLetters() {
+		IsogramChecker iso = new IsogramChecker();
+		assertTrue(iso.isIsogram("Heizölrückstoßabdämpfung"));
+	}
+	
+	@Ignore
+	@Test
+	public void testIgnoresSpaces() {
+		IsogramChecker iso = new IsogramChecker();
+		assertFalse(iso.isIsogram("the quick brown fox"));
+	}
+	
+	@Ignore
+	@Test
+	public void testIgnoresSpaces2() {
+		IsogramChecker iso = new IsogramChecker();
+		assertTrue(iso.isIsogram("Emily Jung Schwartzkopf"));
+	}
+	
+	@Ignore
+	@Test
+	public void testDuplicateAccentedLetters() {
+		IsogramChecker iso = new IsogramChecker();
+		assertFalse(iso.isIsogram("éléphant"));
+	}
+
+}

exercises/settings.gradle

 include 'hamming'
 include 'hexadecimal'
 include 'hello-world'
+include 'isogram'
 include 'largest-series-product'
 include 'linked-list'
 include 'list-ops'