Add Java variants of WriteTo{Csv,Json}.

sdks/java/extensions/schemaio-expansion-service/build.gradle

@@ -32,8 +32,14 @@ applyJavaNature(
 dependencies {
     implementation project(path: ":sdks:java:expansion-service")
     permitUnusedDeclared project(path: ":sdks:java:expansion-service") // BEAM-11761
+    implementation project(":sdks:java:extensions:google-cloud-platform-core")
+    permitUnusedDeclared project(path: ":sdks:java:extensions:google-cloud-platform-core") // BEAM-11761
+    implementation project(":sdks:java:io:csv")
+    permitUnusedDeclared project(path: ":sdks:java:io:csv") // BEAM-11761
     implementation project(":sdks:java:io:jdbc")
     permitUnusedDeclared project(":sdks:java:io:jdbc") // BEAM-11761
+    implementation project(":sdks:java:io:json")
+    permitUnusedDeclared project(path: ":sdks:java:io:json") // BEAM-11761
     implementation library.java.postgres
     permitUnusedDeclared library.java.postgres // BEAM-11761
     implementation project(path: ":model:pipeline", configuration: "shadow")

sdks/java/io/csv/src/main/java/org/apache/beam/sdk/io/csv/providers/CsvWriteTransformProvider.java

@@ -0,0 +1,145 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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 org.apache.beam.sdk.io.csv.providers;
+
+import static org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.base.Preconditions.checkArgument;
+
+import com.google.auto.service.AutoService;
+import com.google.auto.value.AutoValue;
+import java.util.Collections;
+import java.util.List;
+import org.apache.beam.sdk.io.WriteFilesResult;
+import org.apache.beam.sdk.io.csv.CsvIO;
+import org.apache.beam.sdk.schemas.AutoValueSchema;
+import org.apache.beam.sdk.schemas.Schema;
+import org.apache.beam.sdk.schemas.Schema.Field;
+import org.apache.beam.sdk.schemas.Schema.FieldType;
+import org.apache.beam.sdk.schemas.annotations.DefaultSchema;
+import org.apache.beam.sdk.schemas.annotations.SchemaFieldDescription;
+import org.apache.beam.sdk.schemas.transforms.SchemaTransform;
+import org.apache.beam.sdk.schemas.transforms.SchemaTransformProvider;
+import org.apache.beam.sdk.schemas.transforms.TypedSchemaTransformProvider;
+import org.apache.beam.sdk.transforms.MapElements;
+import org.apache.beam.sdk.values.PCollectionRowTuple;
+import org.apache.beam.sdk.values.Row;
+import org.apache.beam.sdk.values.TypeDescriptors;
+import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.base.Strings;
+import org.apache.commons.csv.CSVFormat;
+
+/**
+ * An implementation of {@link TypedSchemaTransformProvider} for {@link CsvIO#write}.
+ *
+ * <p><b>Internal only:</b> This class is actively being worked on, and it will likely change. We
+ * provide no backwards compatibility guarantees, and it should not be implemented outside the Beam
+ * repository.
+ */
+@SuppressWarnings({
+  "nullness" // TODO(https://github.com/apache/beam/issues/20497)
+})
+@AutoService(SchemaTransformProvider.class)
+public class CsvWriteTransformProvider
+    extends TypedSchemaTransformProvider<CsvWriteTransformProvider.CsvWriteConfiguration> {
+  private static final String INPUT_ROWS_TAG = "input";
+  private static final String WRITE_RESULTS = "output";
+
+  @Override
+  protected Class<CsvWriteConfiguration> configurationClass() {
+    return CsvWriteConfiguration.class;
+  }
+
+  @Override
+  protected SchemaTransform from(CsvWriteConfiguration configuration) {
+    return new CsvWriteTransform(configuration);
+  }
+
+  @Override
+  public String identifier() {
+    return String.format("beam:schematransform:org.apache.beam:csv_write:v1");
+  }
+
+  @Override
+  public List<String> inputCollectionNames() {
+    return Collections.singletonList(INPUT_ROWS_TAG);
+  }
+
+  @Override
+  public List<String> outputCollectionNames() {
+    return Collections.singletonList(WRITE_RESULTS);
+  }
+
+  /** Configuration for writing to BigQuery with Storage Write API. */
+  @DefaultSchema(AutoValueSchema.class)
+  @AutoValue
+  public abstract static class CsvWriteConfiguration {
+
+    public void validate() {
+      checkArgument(
+          !Strings.isNullOrEmpty(this.getPath()), "Path for a CSV Write must be specified.");
+    }
+
+    public static Builder builder() {
+      return new AutoValue_CsvWriteTransformProvider_CsvWriteConfiguration.Builder();
+    }
+
+    @SchemaFieldDescription("The file path to write to.")
+    public abstract String getPath();
+
+    /** Builder for {@link CsvWriteConfiguration}. */
+    @AutoValue.Builder
+    public abstract static class Builder {
+
+      public abstract Builder setPath(String path);
+
+      /** Builds a {@link CsvWriteConfiguration} instance. */
+      public abstract CsvWriteConfiguration build();
+    }
+  }
+
+  /** A {@link SchemaTransform} for {@link CsvIO#write}. */
+  protected static class CsvWriteTransform extends SchemaTransform {
+
+    private final CsvWriteConfiguration configuration;
+
+    CsvWriteTransform(CsvWriteConfiguration configuration) {
+      configuration.validate();
+      this.configuration = configuration;
+    }
+
+    @Override
+    public PCollectionRowTuple expand(PCollectionRowTuple input) {
+      WriteFilesResult<?> result =
+          input
+              .get(INPUT_ROWS_TAG)
+              .apply(CsvIO.writeRows(configuration.getPath(), CSVFormat.DEFAULT).withSuffix(""));
+      Schema outputSchema = Schema.of(Field.of("filename", FieldType.STRING));
+      return PCollectionRowTuple.of(
+          WRITE_RESULTS,
+          result
+              .getPerDestinationOutputFilenames()
+              .apply(
+                  "Collect filenames",
+                  MapElements.into(TypeDescriptors.rows())
+                      .via(
+                          (destinationAndRow) ->
+                              Row.withSchema(outputSchema)
+                                  .withFieldValue("filename", destinationAndRow.getValue())
+                                  .build()))
+              .setRowSchema(outputSchema));
+    }
+  }
+}

sdks/java/io/csv/src/main/java/org/apache/beam/sdk/io/csv/providers/package-info.java

@@ -0,0 +1,20 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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.
+ */
+
+/** Transforms for reading and writing CSV files. */
+package org.apache.beam.sdk.io.csv.providers;

sdks/java/io/json/build.gradle

@@ -0,0 +1,35 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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.
+ */
+
+plugins { id 'org.apache.beam.module' }
+applyJavaNature(
+        automaticModuleName: 'org.apache.beam.sdk.io.json'
+)
+
+description = "Apache Beam :: SDKs :: Java :: IO :: JSON"
+ext.summary = "IO to read and write JSON files."
+
+dependencies {
+    implementation project(path: ":sdks:java:core", configuration: "shadow")
+    implementation library.java.vendored_guava_32_1_2_jre
+    implementation library.java.everit_json_schema
+    testImplementation project(path: ":sdks:java:core", configuration: "shadowTest")
+    testImplementation library.java.junit
+    testRuntimeOnly project(path: ":runners:direct-java", configuration: "shadow")
+    testImplementation project(path: ":sdks:java:io:common", configuration: "testRuntimeMigration")
+}