Refactor code

Signed-off-by: Rishabh Maurya <rishabhmaurya05@gmail.com>

Author: rishabhmaurya

server/src/main/java/org/opensearch/index/mapper/DerivedFieldMapper.java

@@ -72,9 +72,7 @@ public DerivedFieldMapper build(BuilderContext context) {
                 name
             );
             DerivedFieldType ft = new DerivedFieldType(
-                buildFullName(context),
-                type.getValue(),
-                script.getValue(),
+                new DerivedField(buildFullName(context), type.getValue(), script.getValue()),
                 fieldMapper,
                 fieldFunction
             );

server/src/main/java/org/opensearch/index/mapper/DerivedFieldType.java

@@ -23,7 +23,6 @@
 import org.opensearch.index.query.DerivedFieldQuery;
 import org.opensearch.index.query.QueryShardContext;
 import org.opensearch.script.DerivedFieldScript;
-import org.opensearch.script.Script;
 import org.opensearch.search.lookup.SearchLookup;
 
 import java.io.IOException;
@@ -40,40 +39,30 @@
  */
 @PublicApi(since = "2.14.0")
 public final class DerivedFieldType extends MappedFieldType {
-    private final String type;
 
-    private final Script script;
+    private final DerivedField derivedField;
 
     FieldMapper typeFieldMapper;
 
     final Function<Object, IndexableField> indexableFieldGenerator;
 
     public DerivedFieldType(
-        String name,
-        String type,
-        Script script,
+        DerivedField derivedField,
         boolean isIndexed,
         boolean isStored,
         boolean hasDocValues,
         Map<String, String> meta,
         FieldMapper typeFieldMapper,
         Function<Object, IndexableField> fieldFunction
     ) {
-        super(name, isIndexed, isStored, hasDocValues, typeFieldMapper.fieldType().getTextSearchInfo(), meta);
-        this.type = type;
-        this.script = script;
+        super(derivedField.getName(), isIndexed, isStored, hasDocValues, typeFieldMapper.fieldType().getTextSearchInfo(), meta);
+        this.derivedField = derivedField;
         this.typeFieldMapper = typeFieldMapper;
         this.indexableFieldGenerator = fieldFunction;
     }
 
-    public DerivedFieldType(
-        String name,
-        String type,
-        Script script,
-        FieldMapper typeFieldMapper,
-        Function<Object, IndexableField> fieldFunction
-    ) {
-        this(name, type, script, false, false, false, Collections.emptyMap(), typeFieldMapper, fieldFunction);
+    public DerivedFieldType(DerivedField derivedField, FieldMapper typeFieldMapper, Function<Object, IndexableField> fieldFunction) {
+        this(derivedField, false, false, false, Collections.emptyMap(), typeFieldMapper, fieldFunction);
     }
 
     @Override
@@ -82,7 +71,7 @@ public String typeName() {
     }
 
     public String getType() {
-        return type;
+        return derivedField.getType();
     }
 
     public NamedAnalyzer getIndexAnalyzer() {
@@ -280,7 +269,7 @@ private DerivedFieldScript.LeafFactory getDerivedFieldLeafFactory(QueryShardCont
                     + "]"
             );
         }
-        DerivedFieldScript.Factory factory = context.compile(script, DerivedFieldScript.CONTEXT);
-        return factory.newFactory(script.getParams(), context.lookup());
+        DerivedFieldScript.Factory factory = context.compile(derivedField.getScript(), DerivedFieldScript.CONTEXT);
+        return factory.newFactory(derivedField.getScript().getParams(), context.lookup());
     }
 }

server/src/test/java/org/opensearch/index/mapper/DerivedFieldTypeTests.java

@@ -28,9 +28,7 @@ private DerivedFieldType createDerivedFieldType(String type) {
         Mapper.BuilderContext context = mock(Mapper.BuilderContext.class);
         when(context.path()).thenReturn(new ContentPath());
         return new DerivedFieldType(
-            type + " _derived_field",
-            type,
-            new Script(""),
+            new DerivedField(type + " _derived_field", type, new Script("")),
             DerivedFieldSupportedTypes.getFieldMapperFromType(type, type + "_derived_field", context),
             DerivedFieldSupportedTypes.getIndexableFieldGeneratorType(type, type + "_derived_field")
         );