Make private classes final
diff --git a/src/main/java/org/apache/commons/configuration2/AbstractHierarchicalConfiguration.java b/src/main/java/org/apache/commons/configuration2/AbstractHierarchicalConfiguration.java
index 458a2db..12f0fcc 100644
--- a/src/main/java/org/apache/commons/configuration2/AbstractHierarchicalConfiguration.java
+++ b/src/main/java/org/apache/commons/configuration2/AbstractHierarchicalConfiguration.java
@@ -675,7 +675,7 @@
*
* @param <T> the type of the nodes managed by this hierarchical configuration
*/
- private static class DefinedVisitor<T> extends ConfigurationNodeVisitorAdapter<T> {
+ private static final class DefinedVisitor<T> extends ConfigurationNodeVisitorAdapter<T> {
/** Stores the defined flag. */
private boolean defined;
@@ -713,7 +713,7 @@
/**
* A specialized visitor that fills a list with keys that are defined in a node hierarchy.
*/
- private class DefinedKeysVisitor extends ConfigurationNodeVisitorAdapter<T> {
+ private final class DefinedKeysVisitor extends ConfigurationNodeVisitorAdapter<T> {
/** Stores the list to be filled. */
private final Set<String> keyList;
diff --git a/src/main/java/org/apache/commons/configuration2/DataConfiguration.java b/src/main/java/org/apache/commons/configuration2/DataConfiguration.java
index a972228..5fde290 100644
--- a/src/main/java/org/apache/commons/configuration2/DataConfiguration.java
+++ b/src/main/java/org/apache/commons/configuration2/DataConfiguration.java
@@ -1431,7 +1431,7 @@
* takes care that the format pattern can be defined as a property of the wrapped configuration or temporarily passed
* when calling a conversion method.
*/
- private class DataConversionHandler extends DefaultConversionHandler {
+ private final class DataConversionHandler extends DefaultConversionHandler {
/**
* {@inheritDoc} This implementation checks for a defined data format in the following order:
* <ul>
diff --git a/src/main/java/org/apache/commons/configuration2/HierarchicalConfigurationXMLReader.java b/src/main/java/org/apache/commons/configuration2/HierarchicalConfigurationXMLReader.java
index 3c88804..e84868f 100644
--- a/src/main/java/org/apache/commons/configuration2/HierarchicalConfigurationXMLReader.java
+++ b/src/main/java/org/apache/commons/configuration2/HierarchicalConfigurationXMLReader.java
@@ -100,7 +100,7 @@
/**
* A specialized visitor class for generating SAX events for a hierarchical node structure.
*/
- private class SAXVisitor extends ConfigurationNodeVisitorAdapter<T> {
+ private final class SAXVisitor extends ConfigurationNodeVisitorAdapter<T> {
/** Constant for the attribute type. */
private static final String ATTR_TYPE = "CDATA";
diff --git a/src/main/java/org/apache/commons/configuration2/XMLPropertiesConfiguration.java b/src/main/java/org/apache/commons/configuration2/XMLPropertiesConfiguration.java
index d54962b..64fe72f 100644
--- a/src/main/java/org/apache/commons/configuration2/XMLPropertiesConfiguration.java
+++ b/src/main/java/org/apache/commons/configuration2/XMLPropertiesConfiguration.java
@@ -300,7 +300,7 @@
*
* @since 1.2
*/
- private class XMLPropertiesHandler extends DefaultHandler {
+ private final class XMLPropertiesHandler extends DefaultHandler {
/** The key of the current entry being parsed. */
private String key;
diff --git a/src/main/java/org/apache/commons/configuration2/tree/ModelTransaction.java b/src/main/java/org/apache/commons/configuration2/tree/ModelTransaction.java
index e4fd85a..a90c940 100644
--- a/src/main/java/org/apache/commons/configuration2/tree/ModelTransaction.java
+++ b/src/main/java/org/apache/commons/configuration2/tree/ModelTransaction.java
@@ -567,7 +567,7 @@
* operation is frequently used because each update of a node causes updates of the children of all parent nodes.
* Therefore, it is treated in a special way and allows adding further sub operations dynamically.
*/
- private class ChildrenUpdateOperation extends Operation {
+ private final class ChildrenUpdateOperation extends Operation {
/** A collection with new nodes to be added. */
private Collection<ImmutableNode> newNodes;
@@ -676,7 +676,7 @@
/**
* A specialized operation class for adding an attribute to a target node.
*/
- private static class AddAttributeOperation extends Operation {
+ private static final class AddAttributeOperation extends Operation {
/** The attribute name. */
private final String attributeName;
@@ -703,7 +703,7 @@
/**
* A specialized operation class for adding multiple attributes to a target node.
*/
- private static class AddAttributesOperation extends Operation {
+ private static final class AddAttributesOperation extends Operation {
/** The map with attributes. */
private final Map<String, Object> attributes;
@@ -725,7 +725,7 @@
/**
* A specialized operation class for removing an attribute from a target node.
*/
- private static class RemoveAttributeOperation extends Operation {
+ private static final class RemoveAttributeOperation extends Operation {
/** The attribute name. */
private final String attributeName;
@@ -747,7 +747,7 @@
/**
* A specialized operation class which changes the value of a node.
*/
- private static class ChangeNodeValueOperation extends Operation {
+ private static final class ChangeNodeValueOperation extends Operation {
/** The new value for the affected node. */
private final Object newValue;
@@ -769,7 +769,7 @@
/**
* A specialized operation class which changes the name of a node.
*/
- private static class ChangeNodeNameOperation extends Operation {
+ private static final class ChangeNodeNameOperation extends Operation {
/** The new node name. */
private final String newName;
@@ -791,7 +791,7 @@
/**
* A helper class which collects multiple update operations to be executed on a single node.
*/
- private class Operations {
+ private final class Operations {
/** An operation for manipulating child nodes. */
private ChildrenUpdateOperation childrenOperation;
