Small refactoring + additional classes

Signed-off-by: Stanislav Trailov <Stanislav.Trailov@bosch.io>

hawkbit-core/src/main/java/org/eclipse/hawkbit/repository/DistributionSetTagFields.java

@@ -0,0 +1,69 @@
+/**
+ * Copyright (c) 2023 Bosch.IO GmbH and others.
+ *
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ */
+package org.eclipse.hawkbit.repository;
+
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+
+/**
+ * Describing the fields of the Tag model which can be used in the REST API e.g.
+ * for sorting etc.
+ * Additionally here were added fields for DistributionSet in order
+ * filtering over distribution set fields also.
+ */
+public enum DistributionSetTagFields implements FieldNameProvider {
+  /**
+   * The id field.
+   */
+  ID("id"),
+
+  /**
+   * The name field.
+   */
+  NAME("name"),
+  /**
+   * The description field.
+   */
+  DESCRIPTION("description"),
+  /**
+   * The controllerId field.
+   */
+  COLOUR("colour"),
+
+  /**
+   *
+   */
+  DISTRIBUTIONSET("assignedToDistributionSet",
+      DistributionSetFields.ID.getFieldName(), DistributionSetFields.NAME.getFieldName());
+
+  private final String fieldName;
+
+  private final List<String> subEntityAttributes;
+
+  private DistributionSetTagFields(final String fieldName) {
+    this.fieldName = fieldName;
+    this.subEntityAttributes = Collections.emptyList();
+  }
+
+  private DistributionSetTagFields(final String fieldName, final String... subEntityAttributes) {
+    this.fieldName = fieldName;
+    this.subEntityAttributes = Arrays.asList(subEntityAttributes);
+  }
+
+  @Override
+  public List<String> getSubEntityAttributes() {
+    return Collections.unmodifiableList(subEntityAttributes);
+  }
+
+  @Override
+  public String getFieldName() {
+    return fieldName;
+  }
+}

hawkbit-core/src/main/java/org/eclipse/hawkbit/repository/TargetTagFields.java

@@ -0,0 +1,69 @@
+/**
+ * Copyright (c) 2023 Bosch.IO GmbH and others.
+ *
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ */
+package org.eclipse.hawkbit.repository;
+
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+
+/**
+ * Describing the fields of the Tag model which can be used in the REST API e.g.
+ * for sorting etc.
+ * Additionally here were added fields for Target in order
+ * filtering over target fields also.
+ */
+public enum TargetTagFields implements FieldNameProvider {
+  /**
+   * The id field.
+   */
+  ID("id"),
+
+  /**
+   * The name field.
+   */
+  NAME("name"),
+  /**
+   * The description field.
+   */
+  DESCRIPTION("description"),
+  /**
+   * The controllerId field.
+   */
+  COLOUR("colour"),
+
+  /**
+   *
+   */
+  TARGET("assignedToTargets",
+      TargetFields.ID.getFieldName(), TargetFields.NAME.getFieldName());
+
+  private final String fieldName;
+
+  private final List<String> subEntityAttributes;
+
+  private TargetTagFields(final String fieldName) {
+    this.fieldName = fieldName;
+    this.subEntityAttributes = Collections.emptyList();
+  }
+
+  private TargetTagFields(final String fieldName, final String... subEntityAttributes) {
+    this.fieldName = fieldName;
+    this.subEntityAttributes = Arrays.asList(subEntityAttributes);
+  }
+
+  @Override
+  public List<String> getSubEntityAttributes() {
+    return Collections.unmodifiableList(subEntityAttributes);
+  }
+
+  @Override
+  public String getFieldName() {
+    return fieldName;
+  }
+}