feat(model): add data_visualization layout block

slack-api-model/src/main/java/com/slack/api/model/block/Blocks.java

@@ -129,4 +129,10 @@ public static ShareShortcutBlock shareShortcut() {
         return ShareShortcutBlock.builder().build();
     }
 
+    // DataVisualizationBlock
+
+    public static DataVisualizationBlock dataVisualization(ModelConfigurator<DataVisualizationBlock.DataVisualizationBlockBuilder> configurator) {
+        return configurator.configure(DataVisualizationBlock.builder()).build();
+    }
+
 }

slack-api-model/src/main/java/com/slack/api/model/block/DataVisualizationAxisConfig.java

@@ -0,0 +1,34 @@
+package com.slack.api.model.block;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import java.util.List;
+
+/**
+ * The axis configuration of a bar, area, or line {@link DataVisualizationChart}.
+ *
+ * @see <a href="https://docs.slack.dev/reference/block-kit/blocks/data-visualization-block">Data visualization block</a>
+ */
+@Data
+@Builder
+@NoArgsConstructor
+@AllArgsConstructor
+public class DataVisualizationAxisConfig {
+    /**
+     * The x-axis labels that define the display order of categories. Each maximum 20 characters.
+     */
+    private List<String> categories;
+
+    /**
+     * The x-axis title. Maximum 50 characters.
+     */
+    private String xLabel;
+
+    /**
+     * The y-axis title. Maximum 50 characters.
+     */
+    private String yLabel;
+}

slack-api-model/src/main/java/com/slack/api/model/block/DataVisualizationBlock.java

@@ -0,0 +1,33 @@
+package com.slack.api.model.block;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+/**
+ * A data visualization is a layout block used to render a chart from supplied data. The chart may be
+ * a pie, bar, area, or line chart, configured via the {@link DataVisualizationChart chart} object.
+ *
+ * @see <a href="https://docs.slack.dev/reference/block-kit/blocks/data-visualization-block">Data visualization block</a>
+ */
+@Data
+@Builder
+@NoArgsConstructor
+@AllArgsConstructor
+public class DataVisualizationBlock implements LayoutBlock {
+    public static final String TYPE = "data_visualization";
+    private final String type = TYPE;
+
+    /**
+     * The label displayed above the chart. Maximum 50 characters.
+     */
+    private String title;
+
+    /**
+     * The chart to render. One of pie, bar, area, or line.
+     */
+    private DataVisualizationChart chart;
+
+    private String blockId;
+}

slack-api-model/src/main/java/com/slack/api/model/block/DataVisualizationChart.java

@@ -0,0 +1,43 @@
+package com.slack.api.model.block;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import java.util.List;
+
+/**
+ * The chart rendered by a {@link DataVisualizationBlock}.
+ *
+ * <p>For a pie chart ({@code type} = {@code pie}), supply {@code segments}. For a bar, area, or line
+ * chart ({@code type} = {@code bar}, {@code area}, or {@code line}), supply {@code series} together
+ * with an {@link DataVisualizationAxisConfig axis config}.</p>
+ *
+ * @see <a href="https://docs.slack.dev/reference/block-kit/blocks/data-visualization-block">Data visualization block</a>
+ */
+@Data
+@Builder
+@NoArgsConstructor
+@AllArgsConstructor
+public class DataVisualizationChart {
+    /**
+     * The type of chart. One of {@code pie}, {@code bar}, {@code area}, or {@code line}.
+     */
+    private String type;
+
+    /**
+     * The segments of a pie chart. Required for pie charts; between 1 and 6 items.
+     */
+    private List<DataVisualizationSegment> segments;
+
+    /**
+     * The data series of a bar, area, or line chart. Required for those chart types; between 1 and 6 items.
+     */
+    private List<DataVisualizationSeries> series;
+
+    /**
+     * The axis configuration for a bar, area, or line chart. Required for those chart types.
+     */
+    private DataVisualizationAxisConfig axisConfig;
+}

slack-api-model/src/main/java/com/slack/api/model/block/DataVisualizationDataPoint.java

@@ -0,0 +1,28 @@
+package com.slack.api.model.block;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+/**
+ * A single data point of a {@link DataVisualizationSeries}.
+ *
+ * @see <a href="https://docs.slack.dev/reference/block-kit/blocks/data-visualization-block">Data visualization block</a>
+ */
+@Data
+@Builder
+@NoArgsConstructor
+@AllArgsConstructor
+public class DataVisualizationDataPoint {
+    /**
+     * The x-axis category. Must match a category defined in the chart's
+     * {@link DataVisualizationAxisConfig axis config}. Maximum 20 characters.
+     */
+    private String label;
+
+    /**
+     * The y-axis value. Negative values are permitted.
+     */
+    private Double value;
+}

slack-api-model/src/main/java/com/slack/api/model/block/DataVisualizationSegment.java

@@ -0,0 +1,27 @@
+package com.slack.api.model.block;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+/**
+ * A single segment of a pie chart within a {@link DataVisualizationChart}.
+ *
+ * @see <a href="https://docs.slack.dev/reference/block-kit/blocks/data-visualization-block">Data visualization block</a>
+ */
+@Data
+@Builder
+@NoArgsConstructor
+@AllArgsConstructor
+public class DataVisualizationSegment {
+    /**
+     * The legend/hover text for the segment. Maximum 20 characters.
+     */
+    private String label;
+
+    /**
+     * The weight of the segment. Must be greater than 0.
+     */
+    private Double value;
+}

slack-api-model/src/main/java/com/slack/api/model/block/DataVisualizationSeries.java

@@ -0,0 +1,29 @@
+package com.slack.api.model.block;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import java.util.List;
+
+/**
+ * A single data series of a bar, area, or line chart within a {@link DataVisualizationChart}.
+ *
+ * @see <a href="https://docs.slack.dev/reference/block-kit/blocks/data-visualization-block">Data visualization block</a>
+ */
+@Data
+@Builder
+@NoArgsConstructor
+@AllArgsConstructor
+public class DataVisualizationSeries {
+    /**
+     * The legend identifier for the series. Must be unique per chart. Maximum 20 characters.
+     */
+    private String name;
+
+    /**
+     * The data points of the series, one per category. Between 1 and 20 items.
+     */
+    private List<DataVisualizationDataPoint> data;
+}

slack-api-model/src/main/java/com/slack/api/util/json/GsonLayoutBlockFactory.java

@@ -61,6 +61,8 @@ private Class<? extends LayoutBlock> getLayoutClassInstance(String typeName) {
                 return RichTextBlock.class;
             case ShareShortcutBlock.TYPE:
                 return ShareShortcutBlock.class;
+            case DataVisualizationBlock.TYPE:
+                return DataVisualizationBlock.class;
             default:
                 if (failOnUnknownProperties) {
                     throw new JsonParseException("Unsupported layout block type: " + typeName);

slack-api-model/src/test/java/test_locally/api/model/block/BlockKitTest.java

@@ -1802,6 +1802,110 @@ public void parseLinkTriggerMessages() {
     }
 
 
+    @Test
+    public void parseDataVisualizationPie() {
+        // https://docs.slack.dev/reference/block-kit/blocks/data-visualization-block
+        String json = "{\n" +
+                "  \"blocks\": [\n" +
+                "    {\n" +
+                "      \"type\": \"data_visualization\",\n" +
+                "      \"block_id\": \"dv1\",\n" +
+                "      \"title\": \"Sales by region\",\n" +
+                "      \"chart\": {\n" +
+                "        \"type\": \"pie\",\n" +
+                "        \"segments\": [\n" +
+                "          { \"label\": \"North\", \"value\": 40 },\n" +
+                "          { \"label\": \"South\", \"value\": 60 }\n" +
+                "        ]\n" +
+                "      }\n" +
+                "    }\n" +
+                "  ]\n" +
+                "}";
+        Message message = GsonFactory.createSnakeCase().fromJson(json, Message.class);
+        assertThat(message, is(notNullValue()));
+        assertThat(message.getBlocks().size(), is(1));
+        DataVisualizationBlock block = (DataVisualizationBlock) message.getBlocks().get(0);
+        assertThat(block.getType(), is("data_visualization"));
+        assertThat(block.getBlockId(), is("dv1"));
+        assertThat(block.getTitle(), is("Sales by region"));
+        assertThat(block.getChart().getType(), is("pie"));
+        assertThat(block.getChart().getSegments().size(), is(2));
+        assertThat(block.getChart().getSegments().get(0).getLabel(), is("North"));
+        assertThat(block.getChart().getSegments().get(0).getValue(), is(40.0));
+        assertThat(block.getChart().getSeries(), is(nullValue()));
+        assertThat(block.getChart().getAxisConfig(), is(nullValue()));
+    }
+
+    @Test
+    public void parseDataVisualizationBar() {
+        // https://docs.slack.dev/reference/block-kit/blocks/data-visualization-block
+        String json = "{\n" +
+                "  \"blocks\": [\n" +
+                "    {\n" +
+                "      \"type\": \"data_visualization\",\n" +
+                "      \"title\": \"Revenue\",\n" +
+                "      \"chart\": {\n" +
+                "        \"type\": \"bar\",\n" +
+                "        \"series\": [\n" +
+                "          {\n" +
+                "            \"name\": \"2025\",\n" +
+                "            \"data\": [\n" +
+                "              { \"label\": \"Q1\", \"value\": 100 },\n" +
+                "              { \"label\": \"Q2\", \"value\": -20 }\n" +
+                "            ]\n" +
+                "          }\n" +
+                "        ],\n" +
+                "        \"axis_config\": {\n" +
+                "          \"categories\": [\"Q1\", \"Q2\"],\n" +
+                "          \"x_label\": \"Quarter\",\n" +
+                "          \"y_label\": \"USD\"\n" +
+                "        }\n" +
+                "      }\n" +
+                "    }\n" +
+                "  ]\n" +
+                "}";
+        Message message = GsonFactory.createSnakeCase().fromJson(json, Message.class);
+        assertThat(message, is(notNullValue()));
+        assertThat(message.getBlocks().size(), is(1));
+        DataVisualizationBlock block = (DataVisualizationBlock) message.getBlocks().get(0);
+        assertThat(block.getTitle(), is("Revenue"));
+        assertThat(block.getChart().getType(), is("bar"));
+        assertThat(block.getChart().getSeries().size(), is(1));
+        assertThat(block.getChart().getSeries().get(0).getName(), is("2025"));
+        assertThat(block.getChart().getSeries().get(0).getData().size(), is(2));
+        assertThat(block.getChart().getSeries().get(0).getData().get(1).getValue(), is(-20.0));
+        assertThat(block.getChart().getAxisConfig().getCategories(), is(Arrays.asList("Q1", "Q2")));
+        assertThat(block.getChart().getAxisConfig().getXLabel(), is("Quarter"));
+        assertThat(block.getChart().getAxisConfig().getYLabel(), is("USD"));
+        assertThat(block.getChart().getSegments(), is(nullValue()));
+    }
+
+    @Test
+    public void dataVisualizationBuilderRoundTrip() {
+        DataVisualizationBlock block = dataVisualization(dv -> dv
+                .blockId("dv-builder")
+                .title("Sales by region")
+                .chart(DataVisualizationChart.builder()
+                        .type("pie")
+                        .segments(Arrays.asList(
+                                DataVisualizationSegment.builder().label("North").value(40.0).build(),
+                                DataVisualizationSegment.builder().label("South").value(60.0).build()
+                        ))
+                        .build()));
+        assertThat(block, is(notNullValue()));
+        assertThat(block.getType(), is("data_visualization"));
+
+        Gson gson = GsonFactory.createSnakeCase();
+        String output = gson.toJson(block);
+        DataVisualizationBlock parsed = gson.fromJson(output, DataVisualizationBlock.class);
+        assertThat(parsed.getTitle(), is("Sales by region"));
+        assertThat(parsed.getBlockId(), is("dv-builder"));
+        assertThat(parsed.getChart().getType(), is("pie"));
+        assertThat(parsed.getChart().getSegments().size(), is(2));
+        assertThat(parsed.getChart().getSegments().get(1).getLabel(), is("South"));
+        assertThat(parsed.getChart().getSegments().get(1).getValue(), is(60.0));
+    }
+
     @Test
     public void parseRichTextElements() {
         String json = "{\n" +