Create CsvIOParse scaffold (#31878)

Co-authored-by: Lahari Guduru <lahariguduru@google.com>

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

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+/*
+ * 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;
+
+import org.apache.beam.sdk.schemas.Schema;
+import org.apache.beam.sdk.transforms.DoFn;
+import org.apache.beam.sdk.transforms.PTransform;
+import org.apache.beam.sdk.transforms.ParDo;
+import org.apache.beam.sdk.values.PCollection;
+
+/**
+ * CsvIO master class that takes an input of {@link PCollection<String>} and outputs custom type
+ * {@link PCollection<T>}.
+ */
+// TODO(https://github.com/apache/beam/issues/31877): Plan for implementation after all dependencies
+// are completed.
+class CsvIOParse<T> extends PTransform<PCollection<String>, PCollection<T>> {
+
+  /** Stores required parameters for parsing. */
+  private final CsvIOParseConfiguration.Builder configBuilder;
+
+  CsvIOParse(CsvIOParseConfiguration.Builder configBuilder) {
+    this.configBuilder = configBuilder;
+  }
+
+  @Override
+  public PCollection<T> expand(PCollection<String> input) {
+    // TODO: Remove dependency to build CsvIOConfiguration with future PR, needed to pass checks.
+    configBuilder.build();
+    return input.apply(ParDo.of(new DoFn<String, T>() {}));
+  }
+
+  /** Parses to custom type not specified under {@link Schema.FieldType}. */
+  // TODO(https://github.com/apache/beam/issues/31875): Implement method.
+  void withCustomRecordParsing() {}
+
+  /** Parses cell to emit the value, as well as potential errors with filename. */
+  // TODO(https://github.com/apache/beam/issues/31876):Implement method.
+  Object parseCell(String cell, Schema.Field field) {
+    return "";
+  }
+}

sdks/java/io/csv/src/test/java/org/apache/beam/sdk/io/csv/CsvIOParseTest.java

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+/*
+ * 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;
+
+import org.apache.beam.sdk.util.SerializableUtils;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+
+/** Tests for {@link CsvIOParse}. */
+@RunWith(JUnit4.class)
+public class CsvIOParseTest {
+  @Test
+  public void isSerializable() {
+    SerializableUtils.ensureSerializable(CsvIOParse.class);
+  }
+}