JENKINS-40737 unify data migration

src/main/java/org/jenkinsci/lib/configprovider/AbstractConfigProviderImpl.java

@@ -2,6 +2,7 @@
 
 import hudson.BulkChange;
 import hudson.XmlFile;
+import hudson.model.ItemGroup;
 import hudson.model.listeners.SaveableListener;
 
 import java.io.File;
@@ -40,6 +41,7 @@ public AbstractConfigProviderImpl() {
 
     /**
      * only used for data migration
+     * @see org.jenkinsci.plugins.configfiles.ConfigFiles
      */
     @Deprecated
     public Map<String, Config> getConfigs() {
@@ -53,6 +55,11 @@ public AbstractConfigProviderImpl() {
         return tmp;
     }
 
+    /**
+     * Only used to convert data from the old (< 1.5) storage format to the new >= 1.5.
+     * New implementations of this extension point do not need to implement this
+     */
+    @Deprecated
     public <T extends Config> T convert(Config config) {
         return (T) config;
     }

src/main/java/org/jenkinsci/plugins/configfiles/custom/CustomConfig.java

@@ -47,10 +47,6 @@ public CustomConfig(String id, String name, String comment, String content, Stri
         super(id, name, comment, content, providerId);
     }
 
-    public CustomConfig(Config config){
-        super(config);
-    }
-
     @Override
     public ConfigProvider getDescriptor() {
         return Jenkins.getActiveInstance().getDescriptorByType(CustomConfigProvider.class);
@@ -75,7 +71,7 @@ public String getDisplayName() {
 
         @Override
         public <T extends Config> T convert(Config config) {
-            return (T) new CustomConfig(config);
+            return (T) new CustomConfig(config.id, config.name, config.comment, config.content, getProviderId());
         }
 
         @Override

src/main/java/org/jenkinsci/plugins/configfiles/groovy/GroovyScript.java

@@ -48,10 +48,6 @@ public GroovyScript(String id, String name, String comment, String content, Stri
         super(id, name, comment, content, providerId);
     }
 
-    public GroovyScript(Config config){
-        super(config);
-    }
-
     @Override
     public ConfigProvider getDescriptor() {
         return Jenkins.getActiveInstance().getDescriptorByType(GroovyConfigProvider.class);
@@ -76,7 +72,7 @@ public String getDisplayName() {
 
         @Override
         public <T extends Config> T convert(Config config) {
-            return (T) new GroovyScript(config);
+            return (T) new GroovyScript(config.id, config.name, config.comment, config.content, getProviderId());
         }
 
         @Override

src/main/java/org/jenkinsci/plugins/configfiles/json/JsonConfig.java

@@ -36,9 +36,8 @@ of this software and associated documentation files (the "Software"), to deal
 
 /**
  * A config/provider to handle the special case of a Json file
- * 
+ *
  * @author Dominik Bartholdi (imod)
- * 
  */
 public class JsonConfig extends Config {
     private static final long serialVersionUID = 1L;
@@ -52,16 +51,10 @@ public JsonConfig(String id, String name, String comment, String content, String
         super(id, name, comment, fixJsonContent(content), providerId);
     }
 
-    public JsonConfig(@NonNull Config config) {
-        super(config);
-    }
-
-
     /**
      * as the form submission with stapler is done in json too, we have to do "deescape" the formated content of the json file.
-     * 
-     * @param content
-     *            the json body of the file
+     *
+     * @param content the json body of the file
      * @return deescaped json
      */
     private static String fixJsonContent(String content) {
@@ -116,7 +109,7 @@ public Config newConfig(@NonNull String id) {
 
         @Override
         public <T extends Config> T convert(Config config) {
-            return (T) new JsonConfig(config.id, config.name,config.comment,config.content,getProviderId());
+            return (T) new JsonConfig(config.id, config.name, config.comment, config.content, getProviderId());
         }
     }
 

src/main/java/org/jenkinsci/plugins/configfiles/maven/MavenToolchainsConfig.java

@@ -51,10 +51,6 @@ public MavenToolchainsConfig(String id, String name, String comment, String cont
         super(id, name, comment, content, providerId);
     }
 
-    public MavenToolchainsConfig(Config config) {
-        super(config);
-    }
-
     @Override
     public ConfigProvider getDescriptor() {
         return Jenkins.getActiveInstance().getDescriptorByType(MavenToolchainsConfigProvider.class);
@@ -102,7 +98,7 @@ public Config newConfig(@NonNull String id) {
 
         @Override
         public <T extends Config> T convert(Config config) {
-            return (T) new MavenToolchainsConfig(config);
+            return (T) new MavenToolchainsConfig(config.id, config.name, config.comment, config.content, getProviderId());
         }
 
         private String loadTemplateContent() {

src/main/java/org/jenkinsci/plugins/configfiles/xml/XmlConfig.java

@@ -47,10 +47,6 @@ public XmlConfig(String id, String name, String comment, String content, String
         super(id, name, comment, content, providerId);
     }
 
-    public XmlConfig(Config config){
-        super(config);
-    }
-
     @Override
     public ConfigProvider getDescriptor() {
         return Jenkins.getActiveInstance().getDescriptorByType(XmlConfigProvider.class);
@@ -87,7 +83,7 @@ public Config newConfig(@NonNull String id) {
 
         @Override
         public <T extends Config> T convert(Config config) {
-            return (T) new XmlConfig(config);
+            return (T) new XmlConfig(config.id, config.name, config.comment, config.content, getProviderId());
         }
 
         // ======================