Fix javadoc for module "javaintegration" (#396)

Also simplifies some constructors.

Author: dr0i

metafacture-javaintegration/src/main/java/org/metafacture/javaintegration/NamedValueList.java

@@ -34,14 +34,17 @@
 public final class NamedValueList extends DefaultStreamReceiver implements List<NamedValue>, Collector<List<NamedValue>> {
 
     private Collection<List<NamedValue>> collection;
-    private List<NamedValue> list;
+    private List<NamedValue> list = new ArrayList<NamedValue>();
 
     public NamedValueList() {
-        list = new ArrayList<NamedValue>();
     }
 
+    /**
+     * Constructs a NamedValueList with a given Collection.
+     *
+     * @param collection the Collection
+     */
     public NamedValueList(final Collection<List<NamedValue>> collection) {
-        list = new ArrayList<NamedValue>();
         this.collection = collection;
     }
 

metafacture-javaintegration/src/main/java/org/metafacture/javaintegration/NamedValueSet.java

@@ -33,12 +33,9 @@
 public final class NamedValueSet extends DefaultStreamReceiver implements Set<NamedValue>, Collector<Set<NamedValue>> {
 
     private Collection<Set<NamedValue>> collection;
-    private Set<NamedValue> set;
+    private Set<NamedValue> set = new HashSet<>();
 
     public NamedValueSet() {
-        set = new HashSet<>();
-        this.collection = null;
-
     }
 
     /**
@@ -48,7 +45,6 @@ public NamedValueSet() {
      * @param collection is filled with the received results.
      */
     public NamedValueSet(final Collection<Set<NamedValue>> collection) {
-        set = new HashSet<>();
         this.collection = collection;
     }
 

metafacture-javaintegration/src/main/java/org/metafacture/javaintegration/StringListMapToStream.java

@@ -46,6 +46,12 @@ public void process(final ListMap<String, String> listMap) {
         process(listMap, getReceiver());
     }
 
+    /**
+     * Reads a {@link ListMap} and sends it to a {@link StreamReceiver}.
+     *
+     * @param listMap  the ListMap to be read
+     * @param receiver the StreamReceiver to send to
+     */
     public static void process(final ListMap<String, String> listMap, final StreamReceiver receiver) {
         receiver.startRecord(listMap.getId());
         for (final Entry<String, List<String>> entry: listMap.entrySet()) {

metafacture-javaintegration/src/main/java/org/metafacture/javaintegration/StringMap.java

@@ -33,15 +33,17 @@ public final class StringMap extends DefaultStreamReceiver implements Map<String
 
     private boolean closed;
     private Collection<Map<String, String>> collection;
-    private Map<String, String> map;
+    private Map<String, String> map = new HashMap<String, String>();
 
     public StringMap() {
-        map = new HashMap<String, String>();
-        collection = null;
     }
 
+    /**
+     * Constructs a StringMap with a given Collection.
+     *
+     * @param collection the Collection
+     */
     public StringMap(final Collection<Map<String, String>> collection) {
-        map = new HashMap<String, String>();
         this.collection = collection;
     }
 

metafacture-javaintegration/src/main/java/org/metafacture/javaintegration/ValueSet.java

@@ -31,13 +31,10 @@
  */
 public final class ValueSet extends DefaultStreamReceiver implements Set<String>, Collector<Set<String>> {
 
-    private Collection<Set<String>> collection;
+    private Collection<Set<String>> collection = new HashSet<>();
     private Set<String> set;
 
     public ValueSet() {
-        set = new HashSet<>();
-        this.collection = null;
-
     }
 
     /**
@@ -47,7 +44,6 @@ public ValueSet() {
      * @param collection is filled with the received results.
      */
     public ValueSet(final Collection<Set<String>> collection) {
-        set = new HashSet<>();
         this.collection = collection;
     }