Mike/Marc/Chris: FootballMunging is done using tupled return type, on…

…e down, one to go

src/main/java/org/timgroup/dojo/FootballMunging.java

@@ -1,16 +1,39 @@
-package org.timgroup.dojo;
-
-import fj.data.Stream;
-
-public class FootballMunging {
-
-    private final Stream<String> lines;
-
-    public FootballMunging(Stream<String> lines) {
-        this.lines = lines;
-    }
-
-    public String teamWithSmallestDifferenceBetweenForAndAgainst() {
-        return "";
-    }
-}
+package org.timgroup.dojo;
+
+import fj.F;
+import fj.P2;
+import fj.data.Stream;
+
+import static fj.Ord.intOrd;
+import static fj.Ord.stringOrd;
+import static fj.Ord.p2Ord;
+import static fj.P.p;
+
+public class FootballMunging {
+    private final Stream<String> lines;
+
+    public FootballMunging(Stream<String> lines) {
+        this.lines = lines;
+    }
+
+    public String teamWithSmallestDifferenceBetweenForAndAgainst() {
+        return filterLines(lines).map(new F<String, P2<Integer, String>>() {
+            @Override public P2<Integer, String> f(String s) {
+                return parseLine(s);
+            }
+        }).sort(p2Ord(intOrd, stringOrd)).head()._2();
+    }
+
+    public static Stream<String> filterLines(Stream<String> footballLines) {
+        return footballLines.filter(new F<String, Boolean>() {
+            @Override public Boolean f(String s) {
+                return s.contains(" - ");
+            }
+        });
+    }
+
+    public static P2<Integer, String> parseLine(String line) {
+        final String[] fields = line.split("\\s+");
+        return p(Math.abs(Integer.valueOf(fields[7]) - Integer.valueOf(fields[9])), fields[2]);
+    }
+}

src/test/java/org/timgroup/dojo/FootballMungingTest.java

@@ -1,17 +1,37 @@
-package org.timgroup.dojo;
-
-import fj.data.Stream;
-import org.junit.Test;
-
-import static org.hamcrest.CoreMatchers.is;
-import static org.junit.Assert.assertThat;
-import static org.timgroup.dojo.Files.readLinesFrom;
-
-public class FootballMungingTest {
-
-    @Test
-    public void teamWithSmallestDifferenceBetweenForAndAgainstIsAstonVilla() {
-        Stream<String> footballLines = readLinesFrom("football.dat");
-        assertThat(new FootballMunging(footballLines).teamWithSmallestDifferenceBetweenForAndAgainst(), is("Aston_Villa"));
-    }
-}
+package org.timgroup.dojo;
+
+import fj.P2;
+import fj.data.Stream;
+import org.junit.Before;
+import org.junit.Test;
+
+import static org.hamcrest.CoreMatchers.is;
+import static org.junit.Assert.assertThat;
+import static org.timgroup.dojo.Files.readLinesFrom;
+
+public class FootballMungingTest {
+    private Stream<String> footballLines;
+
+    @Before
+    public void setup() {
+        footballLines = readLinesFrom("football.dat");
+    }
+
+    @Test
+    public void teamWithSmallestDifferenceBetweenForAndAgainstIsAstonVilla() {
+        assertThat(new FootballMunging(footballLines).teamWithSmallestDifferenceBetweenForAndAgainst(), is("Aston_Villa"));
+    }
+
+    @Test
+    public void there_are_20_lines_of_football_stats() {
+        assertThat(FootballMunging.filterLines(footballLines).length(), is(20));
+    }
+
+    @Test
+    public void parses_relevant_info_out_of_a_line() {
+        final String firstLine = "    1. Arsenal         38    26   9   3    79  -  36    87";
+        final P2<Integer, String> arsenal = FootballMunging.parseLine(firstLine);
+        assertThat(arsenal._1(), is(43));
+        assertThat(arsenal._2(), is("Arsenal"));
+    }
+}