retrieveList api for labels

wise-webapp/src/main/java/com/wisemapping/rest/model/RestLabel.java

@@ -3,7 +3,10 @@ package com.wisemapping.rest.model;
 import com.wisemapping.model.Label;
 import org.codehaus.jackson.annotate.JsonAutoDetect;
 import org.codehaus.jackson.annotate.JsonIgnore;
+import org.codehaus.jackson.annotate.JsonIgnoreProperties;
 import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
 import javax.xml.bind.annotation.XmlAccessType;
 import javax.xml.bind.annotation.XmlAccessorType;
 import javax.xml.bind.annotation.XmlRootElement;
@@ -18,6 +21,7 @@ import static org.codehaus.jackson.annotate.JsonAutoDetect.Visibility.PUBLIC_ONL
         isGetterVisibility = NONE,
         getterVisibility = PUBLIC_ONLY
 )
+@JsonIgnoreProperties(ignoreUnknown = true)
 public class RestLabel {
 
     @JsonIgnore
@@ -32,6 +36,15 @@ public class RestLabel {
         this.label = label;
     }
 
+    public void setParent(@NotNull final Label parent) {
+        this.label.setParent(parent);
+    }
+
+    @Nullable
+    public Label getParent() {
+        return this.label.getParent();
+    }
+
     public String getTitle() {
         return this.label.getTitle();
     }

wise-webapp/src/main/java/com/wisemapping/rest/model/RestLabelList.java

@@ -0,0 +1,26 @@
+package com.wisemapping.rest.model;
+
+import com.wisemapping.model.Label;
+import org.jetbrains.annotations.NotNull;
+
+import javax.xml.bind.annotation.XmlElement;
+import java.util.ArrayList;
+import java.util.List;
+
+public class RestLabelList {
+
+    @NotNull private final List<RestLabel> restLabels;
+
+    public RestLabelList(@NotNull final List<Label> labels) {
+        this.restLabels = new ArrayList<>(labels.size());
+        for (Label label : labels) {
+            this.restLabels.add(new RestLabel(label));
+        }
+    }
+
+    @NotNull @XmlElement(name = "label")
+    public List<RestLabel> getLabels() {
+        return restLabels;
+    }
+
+}