Added unset-methods to the Requirements-API. ConfigurationService ignores unset requirements now.

Author: sebinside

src/main/java/org/codeoverflow/chatoverflow/api/plugin/configuration/Requirement.java

@@ -70,6 +70,13 @@ public boolean isSet() {
         return value != null;
     }
 
+    /**
+     * Unsets the requirement by inserting the value null
+     */
+    void unsetValue() {
+        value = null;
+    }
+
     /**
      * Returns if the requirement is optional
      *

src/main/java/org/codeoverflow/chatoverflow/api/plugin/configuration/Requirements.java

@@ -65,12 +65,33 @@ private <T extends Serializable> Requirement<T> addRequirement(Map<String, Requi
         return requirement;
     }
 
+    /**
+     * Returns a requirement of any type (input / output / parameter) with the given unique id.
+     *
+     * @param uniqueRequirementId the plugin unique requirement id
+     * @return an optional encapsulating the requirement or none
+     */
     public Optional<? extends Requirement<? extends Serializable>> getRequirementById(String uniqueRequirementId) {
         return getAllEntries()
                 .filter(entry -> entry.getKey().equals(uniqueRequirementId))
                 .map(Map.Entry::getValue).findFirst();
     }
 
+    /**
+     * Unsets the value of a requirement specified by the unique id.
+     *
+     * @param uniqueRequirementId the plugin unique requirement id
+     * @return true, if a requirement with the given id exists
+     */
+    public boolean unsetRequirementById(String uniqueRequirementId) {
+        Optional<? extends Requirement<? extends Serializable>> requirement =
+                getAllEntries().filter(entry -> entry.getKey().equals(uniqueRequirementId))
+                        .map(Map.Entry::getValue).findFirst();
+
+        requirement.ifPresent(Requirement::unsetValue);
+        return requirement.isPresent();
+    }
+
     /**
      * Tests, if all non-optional requirements had been set (e.g. by the framework)
      *