Make more deterministic with LinkedHashMaps and LinkedHashSets (#62)

Author: msridhar

src/pcminer/Author.java

@@ -1,7 +1,7 @@
 package pcminer;
 
-import java.util.HashMap;
-import java.util.HashSet;
+import java.util.LinkedHashMap;
+import java.util.LinkedHashSet;
 import java.util.Map;
 import java.util.Set;
 
@@ -25,8 +25,8 @@ private Author(String name) {
         (name.indexOf(" ") != -1) ? name.substring(0, name.lastIndexOf(" ")).trim() : "";
     this.lastName =
         (name.indexOf(" ") != -1) ? name.substring(name.lastIndexOf(" ") + 1).trim() : name;
-    this.publications = new HashSet<Publication>();
-    this.committees = new HashSet<CommitteeRole>();
+    this.publications = new LinkedHashSet<>();
+    this.committees = new LinkedHashSet<>();
   }
 
   public void addPublication(Publication pub) {
@@ -145,15 +145,15 @@ public String toJson(int indent) {
   private final Set<Publication> publications;
   private final Set<CommitteeRole> committees;
 
-  private static Map<String, String> nameMappings = new HashMap<String, String>();
-  private static Map<Author, Author> authors = new HashMap<Author, Author>();
+  private static Map<String, String> nameMappings = new LinkedHashMap<>();
+  private static Map<Author, Author> authors = new LinkedHashMap<>();
 
   public static void addNameMapping(String from, String to) {
     nameMappings.put(from, to);
   }
 
   public static Set<Author> getAuthors() {
-    return new HashSet<Author>(authors.keySet());
+    return new LinkedHashSet<>(authors.keySet());
   }
 
   public static int nrAuthors() {

src/pcminer/Conference.java

@@ -1,6 +1,6 @@
 package pcminer;
 
-import java.util.HashMap;
+import java.util.LinkedHashMap;
 import java.util.Map;
 
 public class Conference {
@@ -56,7 +56,7 @@ public String getName() {
     return name;
   }
 
-  private static Map<Conference, Conference> conferences = new HashMap<Conference, Conference>();
+  private static Map<Conference, Conference> conferences = new LinkedHashMap<>();
 
   private final String name;
 }

src/pcminer/ConferenceInstance.java

@@ -1,6 +1,6 @@
 package pcminer;
 
-import java.util.HashMap;
+import java.util.LinkedHashMap;
 import java.util.Map;
 
 public class ConferenceInstance {
@@ -80,7 +80,7 @@ public static int nrConferenceInstances() {
   }
 
   private static final Map<ConferenceInstance, ConferenceInstance> conferenceInstances =
-      new HashMap<ConferenceInstance, ConferenceInstance>();
+      new LinkedHashMap<>();
 
   private final Conference conference;
   private final String year;