fix: also pass identifier provider to key mapper for lazy data views (#6688) (CP: 24.4)

vaadin-combo-box-flow-parent/vaadin-combo-box-flow/src/main/java/com/vaadin/flow/component/combobox/dataview/ComboBoxLazyDataView.java

@@ -25,6 +25,7 @@
 import com.vaadin.flow.data.provider.DataCommunicator;
 import com.vaadin.flow.data.provider.DataProvider;
 import com.vaadin.flow.data.provider.HasLazyDataView;
+import com.vaadin.flow.data.provider.IdentifierProvider;
 import com.vaadin.flow.data.provider.ItemCountChangeEvent;
 import com.vaadin.flow.data.provider.Query;
 import com.vaadin.flow.shared.Registration;
@@ -73,6 +74,14 @@ public void setItemCountCallback(
         getDataCommunicator().setCountCallback(callback);
     }
 
+    @Override
+    public void setIdentifierProvider(
+            IdentifierProvider<T> identifierProvider) {
+        super.setIdentifierProvider(identifierProvider);
+        getDataCommunicator().getKeyMapper()
+                .setIdentifierGetter(identifierProvider);
+    }
+
     /**
      * {@inheritDoc}
      * <p>

vaadin-combo-box-flow-parent/vaadin-combo-box-flow/src/test/java/com/vaadin/flow/component/combobox/dataview/ComboBoxLazyDataViewTest.java

@@ -15,6 +15,8 @@
  */
 package com.vaadin.flow.component.combobox.dataview;
 
+import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.List;
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.stream.Collectors;
@@ -34,6 +36,7 @@
 import com.vaadin.flow.data.provider.CallbackDataProvider;
 import com.vaadin.flow.data.provider.DataCommunicator;
 import com.vaadin.flow.data.provider.DataCommunicatorTest;
+import com.vaadin.flow.data.provider.DataKeyMapper;
 import com.vaadin.flow.data.provider.DataProvider;
 import com.vaadin.flow.function.SerializableConsumer;
 
@@ -331,4 +334,29 @@ public void getItem_withCountCallbackAndOutsideOfRange_throw() {
         dataView.getItem(1234567);
     }
 
+    @Test
+    public void setIdentifierProvider_customIdentifier_keyMapperUsesIdentifier() {
+        Item first = new Item(1L, "first");
+        Item second = new Item(2L, "middle");
+
+        List<Item> items = new ArrayList<>(Arrays.asList(first, second));
+
+        ComboBox<Item> component = new ComboBox<>();
+
+        DataCommunicator<Item> dataCommunicator = new DataCommunicator<>(
+                (item, jsonObject) -> {
+                }, null, null, component.getElement().getNode());
+        dataCommunicator.setDataProvider(
+                new CallbackDataProvider<>(query -> Stream.of(), query -> 0),
+                "", true);
+
+        ComboBoxLazyDataView<Item> dataView = new ComboBoxLazyDataView<>(
+                dataCommunicator, component);
+        DataKeyMapper<Item> keyMapper = dataCommunicator.getKeyMapper();
+        items.forEach(keyMapper::key);
+
+        Assert.assertFalse(keyMapper.has(new Item(1L, "non-present")));
+        dataView.setIdentifierProvider(Item::getId);
+        Assert.assertTrue(keyMapper.has(new Item(1L, "non-present")));
+    }
 }

vaadin-combo-box-flow-parent/vaadin-combo-box-flow/src/test/java/com/vaadin/flow/component/combobox/dataview/ComboBoxListDataViewTest.java

@@ -18,7 +18,6 @@
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
-import java.util.Objects;
 import java.util.stream.Stream;
 
 import org.junit.Assert;
@@ -153,53 +152,4 @@ protected HasListDataView<String, ComboBoxListDataView<String>> getComponent() {
         return new ComboBox<>();
     }
 
-    private static class Item {
-        private long id;
-        private String value;
-
-        public Item(long id) {
-            this.id = id;
-        }
-
-        public Item(long id, String value) {
-            this.id = id;
-            this.value = value;
-        }
-
-        public long getId() {
-            return id;
-        }
-
-        public String getValue() {
-            return value;
-        }
-
-        public void setId(long id) {
-            this.id = id;
-        }
-
-        public void setValue(String value) {
-            this.value = value;
-        }
-
-        @Override
-        public boolean equals(Object o) {
-            if (this == o)
-                return true;
-            if (o == null || getClass() != o.getClass())
-                return false;
-            Item item = (Item) o;
-            return id == item.id && Objects.equals(value, item.value);
-        }
-
-        @Override
-        public int hashCode() {
-            return Objects.hash(id, value);
-        }
-
-        @Override
-        public String toString() {
-            return String.valueOf(value);
-        }
-    }
 }

vaadin-combo-box-flow-parent/vaadin-combo-box-flow/src/test/java/com/vaadin/flow/component/combobox/dataview/Item.java

@@ -0,0 +1,69 @@
+/*
+ * Copyright 2000-2024 Vaadin Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+package com.vaadin.flow.component.combobox.dataview;
+
+import java.util.Objects;
+
+class Item {
+    private long id;
+    private String value;
+
+    public Item(long id) {
+        this.id = id;
+    }
+
+    public Item(long id, String value) {
+        this.id = id;
+        this.value = value;
+    }
+
+    public long getId() {
+        return id;
+    }
+
+    public String getValue() {
+        return value;
+    }
+
+    public void setId(long id) {
+        this.id = id;
+    }
+
+    public void setValue(String value) {
+        this.value = value;
+    }
+
+    // equals and hashCode should use both id and value for a valid test setup
+    @Override
+    public boolean equals(Object o) {
+        if (this == o)
+            return true;
+        if (o == null || getClass() != o.getClass())
+            return false;
+        Item item = (Item) o;
+        return id == item.id && Objects.equals(value, item.value);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id, value);
+    }
+
+    @Override
+    public String toString() {
+        return String.valueOf(value);
+    }
+}