feat: DML prototype

google-cloud-firestore/src/main/java/com/google/cloud/firestore/Pipeline.java

@@ -41,9 +41,13 @@
 import com.google.cloud.firestore.pipeline.stages.AddFields;
 import com.google.cloud.firestore.pipeline.stages.Aggregate;
 import com.google.cloud.firestore.pipeline.stages.AggregateOptions;
+import com.google.cloud.firestore.pipeline.stages.Delete;
+import com.google.cloud.firestore.pipeline.stages.DeleteOptions;
 import com.google.cloud.firestore.pipeline.stages.Distinct;
 import com.google.cloud.firestore.pipeline.stages.FindNearest;
 import com.google.cloud.firestore.pipeline.stages.FindNearestOptions;
+import com.google.cloud.firestore.pipeline.stages.Insert;
+import com.google.cloud.firestore.pipeline.stages.InsertOptions;
 import com.google.cloud.firestore.pipeline.stages.Limit;
 import com.google.cloud.firestore.pipeline.stages.Offset;
 import com.google.cloud.firestore.pipeline.stages.PipelineExecuteOptions;
@@ -58,6 +62,8 @@
 import com.google.cloud.firestore.pipeline.stages.Union;
 import com.google.cloud.firestore.pipeline.stages.Unnest;
 import com.google.cloud.firestore.pipeline.stages.UnnestOptions;
+import com.google.cloud.firestore.pipeline.stages.Upsert;
+import com.google.cloud.firestore.pipeline.stages.UpsertOptions;
 import com.google.cloud.firestore.pipeline.stages.Where;
 import com.google.cloud.firestore.telemetry.MetricsUtil.MetricsContext;
 import com.google.cloud.firestore.telemetry.TelemetryConstants;
@@ -995,6 +1001,105 @@ public Pipeline unnest(Selectable field, UnnestOptions options) {
     return append(new Unnest(field, options));
   }
 
+  /**
+   * Performs a delete operation on documents from previous stages.
+   *
+   * @return A new {@code Pipeline} object with this stage appended to the stage list.
+   */
+  @BetaApi
+  public Pipeline delete() {
+    return append(new Delete());
+  }
+
+  /**
+   * Performs a delete operation on documents from previous stages.
+   *
+   * @param target The collection to delete from.
+   * @return A new {@code Pipeline} object with this stage appended to the stage list.
+   */
+  @BetaApi
+  public Pipeline delete(CollectionReference target) {
+    return append(Delete.withCollection(target));
+  }
+
+  /**
+   * Performs a delete operation on documents from previous stages.
+   *
+   * @param deleteStage The {@code Delete} stage to append.
+   * @param options The {@code DeleteOptions} to apply to the stage.
+   * @return A new {@code Pipeline} object with this stage appended to the stage list.
+   */
+  @BetaApi
+  public Pipeline delete(Delete deleteStage, DeleteOptions options) {
+    return append(deleteStage.withOptions(options));
+  }
+
+  /**
+   * Performs an upsert operation using documents from previous stages.
+   *
+   * @return A new {@code Pipeline} object with this stage appended to the stage list.
+   */
+  @BetaApi
+  public Pipeline upsert() {
+    return append(new Upsert());
+  }
+
+  /**
+   * Performs an upsert operation using documents from previous stages.
+   *
+   * @param target The collection to upsert to.
+   * @return A new {@code Pipeline} object with this stage appended to the stage list.
+   */
+  @BetaApi
+  public Pipeline upsert(CollectionReference target) {
+    return append(Upsert.withCollection(target));
+  }
+
+  /**
+   * Performs an upsert operation using documents from previous stages.
+   *
+   * @param upsertStage The {@code Upsert} stage to append.
+   * @param options The {@code UpsertOptions} to apply to the stage.
+   * @return A new {@code Pipeline} object with this stage appended to the stage list.
+   */
+  @BetaApi
+  public Pipeline upsert(Upsert upsertStage, UpsertOptions options) {
+    return append(upsertStage.withOptions(options));
+  }
+
+  /**
+   * Performs an insert operation using documents from previous stages.
+   *
+   * @return A new {@code Pipeline} object with this stage appended to the stage list.
+   */
+  @BetaApi
+  public Pipeline insert() {
+    return append(new Insert());
+  }
+
+  /**
+   * Performs an insert operation using documents from previous stages.
+   *
+   * @param target The collection to insert to.
+   * @return A new {@code Pipeline} object with this stage appended to the stage list.
+   */
+  @BetaApi
+  public Pipeline insert(CollectionReference target) {
+    return append(Insert.withCollection(target));
+  }
+
+  /**
+   * Performs an insert operation using documents from previous stages.
+   *
+   * @param insertStage The {@code Insert} stage to append.
+   * @param options The {@code InsertOptions} to apply to the stage.
+   * @return A new {@code Pipeline} object with this stage appended to the stage list.
+   */
+  @BetaApi
+  public Pipeline insert(Insert insertStage, InsertOptions options) {
+    return append(insertStage.withOptions(options));
+  }
+
   /**
    * Adds a generic stage to the pipeline.
    *

google-cloud-firestore/src/main/java/com/google/cloud/firestore/pipeline/stages/ConflictResolution.java

@@ -0,0 +1,35 @@
+/*
+ * Copyright 2026 Google LLC
+ *
+ * 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.google.cloud.firestore.pipeline.stages;
+
+/** Defines the conflict resolution options for an Upsert pipeline stage. */
+public enum ConflictResolution {
+  OVERWRITE("OVERWRITE"),
+  MERGE("MERGE"),
+  FAIL("FAIL"),
+  KEEP("KEEP");
+
+  private final String value;
+
+  ConflictResolution(String value) {
+    this.value = value;
+  }
+
+  public String getValue() {
+    return value;
+  }
+}

google-cloud-firestore/src/main/java/com/google/cloud/firestore/pipeline/stages/Delete.java

@@ -0,0 +1,68 @@
+/*
+ * Copyright 2024 Google LLC
+ *
+ * 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.google.cloud.firestore.pipeline.stages;
+
+import com.google.api.core.BetaApi;
+import com.google.api.core.InternalApi;
+import com.google.cloud.firestore.CollectionReference;
+import com.google.cloud.firestore.PipelineUtils;
+import com.google.firestore.v1.Value;
+import java.util.ArrayList;
+import java.util.List;
+import javax.annotation.Nullable;
+
+@InternalApi
+public final class Delete extends Stage {
+
+  @Nullable private final String path;
+
+  private Delete(@Nullable String path, InternalOptions options) {
+    super("delete", options);
+    this.path = path;
+  }
+
+  @BetaApi
+  public Delete() {
+    this(null, InternalOptions.EMPTY);
+  }
+
+  @BetaApi
+  public static Delete withCollection(CollectionReference target) {
+    String path = target.getPath();
+    return new Delete(path.startsWith("/") ? path : "/" + path, InternalOptions.EMPTY);
+  }
+
+  @BetaApi
+  public Delete withOptions(DeleteOptions options) {
+    return new Delete(path, this.options.adding(options));
+  }
+
+  @BetaApi
+  public Delete withReturns(DeleteReturn returns) {
+    return new Delete(
+        path, this.options.with("returns", PipelineUtils.encodeValue(returns.getValue())));
+  }
+
+  @Override
+  Iterable<Value> toStageArgs() {
+    List<Value> args = new ArrayList<>();
+    if (path != null) {
+      args.add(Value.newBuilder().setReferenceValue(path).build());
+    }
+    return args;
+  }
+}

google-cloud-firestore/src/main/java/com/google/cloud/firestore/pipeline/stages/DeleteOptions.java

@@ -0,0 +1,38 @@
+/*
+ * Copyright 2024 Google LLC
+ *
+ * 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.google.cloud.firestore.pipeline.stages;
+
+import com.google.api.core.BetaApi;
+
+/** Options for a Delete pipeline stage. */
+@BetaApi
+public class DeleteOptions extends WriteOptions<DeleteOptions> {
+
+  /** Creates a new, empty `DeleteOptions` object. */
+  public DeleteOptions() {
+    super(InternalOptions.EMPTY);
+  }
+
+  DeleteOptions(InternalOptions options) {
+    super(options);
+  }
+
+  @Override
+  DeleteOptions self(InternalOptions options) {
+    return new DeleteOptions(options);
+  }
+}

google-cloud-firestore/src/main/java/com/google/cloud/firestore/pipeline/stages/DeleteReturn.java

@@ -0,0 +1,33 @@
+/*
+ * Copyright 2026 Google LLC
+ *
+ * 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.google.cloud.firestore.pipeline.stages;
+
+/** Defines the return value options for a Delete pipeline stage. */
+public enum DeleteReturn {
+  EMPTY("EMPTY"),
+  DOCUMENT_ID("DOCUMENT_ID");
+
+  private final String value;
+
+  DeleteReturn(String value) {
+    this.value = value;
+  }
+
+  public String getValue() {
+    return value;
+  }
+}

google-cloud-firestore/src/main/java/com/google/cloud/firestore/pipeline/stages/Insert.java

@@ -0,0 +1,78 @@
+/*
+ * Copyright 2024 Google LLC
+ *
+ * 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.google.cloud.firestore.pipeline.stages;
+
+import com.google.api.core.BetaApi;
+import com.google.api.core.InternalApi;
+import com.google.cloud.firestore.CollectionReference;
+import com.google.cloud.firestore.PipelineUtils;
+import com.google.cloud.firestore.pipeline.expressions.Selectable;
+import com.google.firestore.v1.Value;
+import java.util.ArrayList;
+import java.util.List;
+import javax.annotation.Nullable;
+
+@InternalApi
+public final class Insert extends Stage {
+
+  @Nullable private final String path;
+
+  private Insert(@Nullable String path, InternalOptions options) {
+    super("insert", options);
+    this.path = path;
+  }
+
+  @BetaApi
+  public Insert() {
+    this(null, InternalOptions.EMPTY);
+  }
+
+  @BetaApi
+  public static Insert withCollection(CollectionReference target) {
+    String path = target.getPath();
+    return new Insert(path.startsWith("/") ? path : "/" + path, InternalOptions.EMPTY);
+  }
+
+  @BetaApi
+  public Insert withOptions(InsertOptions options) {
+    return new Insert(path, this.options.adding(options));
+  }
+
+  @BetaApi
+  public Insert withReturns(InsertReturn returns) {
+    return new Insert(
+        path, this.options.with("returns", PipelineUtils.encodeValue(returns.getValue())));
+  }
+
+  @BetaApi
+  public Insert withTransformations(Selectable... transformations) {
+    return new Insert(
+        path,
+        this.options.with(
+            "transformations",
+            PipelineUtils.encodeValue(PipelineUtils.selectablesToMap(transformations))));
+  }
+
+  @Override
+  Iterable<Value> toStageArgs() {
+    List<Value> args = new ArrayList<>();
+    if (path != null) {
+      args.add(Value.newBuilder().setReferenceValue(path).build());
+    }
+    return args;
+  }
+}