Privatise key & value; add protected setters (fields were protected)

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/collections/trunk@1477599 13f79535-47bb-0310-9956-ffa450edef68

src/main/java/org/apache/commons/collections4/keyvalue/AbstractKeyValue.java

@@ -28,9 +28,9 @@ import org.apache.commons.collections4.KeyValue;
 public abstract class AbstractKeyValue<K, V> implements KeyValue<K, V> {
 
     /** The key */
-    protected K key;
+    private K key;
     /** The value */
-    protected V value;
+    private V value;
 
     /**
      * Constructs a new pair with the specified key and given value.
@@ -53,6 +53,12 @@ public abstract class AbstractKeyValue<K, V> implements KeyValue<K, V> {
         return key;
     }
 
+    protected K setKey(K key) {
+        final K old = this.key;
+        this.key = key;
+        return old;
+    }
+
     /**
      * Gets the value from the pair.
      *
@@ -62,6 +68,12 @@ public abstract class AbstractKeyValue<K, V> implements KeyValue<K, V> {
         return value;
     }
 
+    protected V setValue(V value) {
+        final V old = this.value;
+        this.value = value;
+        return old;
+    }
+
     /**
      * Gets a debugging String view of the pair.
      * 

src/main/java/org/apache/commons/collections4/keyvalue/AbstractMapEntry.java

@@ -48,10 +48,9 @@ public abstract class AbstractMapEntry<K, V> extends AbstractKeyValue<K, V> impl
      * @param value  the new value
      * @return the previous value
      */
+    @Override
     public V setValue(final V value) {
-        final V answer = this.value;
-        this.value = value;
-        return answer;
+        return super.setValue(value);
     }
 
     /**

src/main/java/org/apache/commons/collections4/keyvalue/DefaultKeyValue.java

@@ -77,14 +77,13 @@ public class DefaultKeyValue<K, V> extends AbstractKeyValue<K, V> {
      * @return the old key
      * @throws IllegalArgumentException if key is this object
      */
+    @Override
     public K setKey(final K key) {
         if (key == this) {
             throw new IllegalArgumentException("DefaultKeyValue may not contain itself as a key.");
         }
 
-        final K old = this.key;
-        this.key = key;
-        return old;
+        return super.setKey(key);
     }
 
     /** 
@@ -94,14 +93,13 @@ public class DefaultKeyValue<K, V> extends AbstractKeyValue<K, V> {
      * @param value the new value
      * @throws IllegalArgumentException if value is this object
      */
+    @Override
     public V setValue(final V value) {
         if (value == this) {
             throw new IllegalArgumentException("DefaultKeyValue may not contain itself as a value.");
         }
 
-        final V old = this.value;
-        this.value = value;
-        return old;
+        return super.setValue(value);
     }
 
     //-----------------------------------------------------------------------