Added auto assign distribution set to target filter query feature

Signed-off-by: Dominik Herbst <dominik.herbst@bosch-si.com>

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

@@ -0,0 +1,70 @@
+/**
+ * Copyright (c) 2015 Bosch Software Innovations 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 Target model which can be used in the REST API
+ * e.g. for sorting etc.
+ *
+ */
+public enum TargetFilterQueryFields implements FieldNameProvider {
+
+    /**
+     * The id field.
+     */
+    ID("id"),
+
+    /**
+     * The name field.
+     */
+    NAME("name"),
+
+    /**
+     * distribution set which is set as auto assign distribution set
+     */
+    AUTOASSIGNDISTRIBUTIONSET("autoAssignDistributionSet", "name", "version");
+
+
+    private final String fieldName;
+    private List<String> subEntityAttributes;
+    private boolean mapField;
+
+    TargetFilterQueryFields(final String fieldName) {
+        this(fieldName, false, Collections.emptyList());
+    }
+
+    TargetFilterQueryFields(final String fieldName, final String... subEntityAttribues) {
+        this(fieldName, false, Arrays.asList(subEntityAttribues));
+    }
+
+    TargetFilterQueryFields(final String fieldName, final boolean mapField, final List<String> subEntityAttribues) {
+        this.fieldName = fieldName;
+        this.mapField = mapField;
+        this.subEntityAttributes = subEntityAttribues;
+    }
+
+    @Override
+    public List<String> getSubEntityAttributes() {
+        return subEntityAttributes;
+    }
+
+    @Override
+    public boolean isMap() {
+        return mapField;
+    }
+
+    @Override
+    public String getFieldName() {
+        return fieldName;
+    }
+}