samza-api/src/main/java/org/apache/samza/sql/schema/SqlSchemaBuilder.java

/*
 * 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.samza.sql.schema;

import java.util.ArrayList;
import java.util.List;


/**
 * Builder class to build the {@link SqlSchema}.
 */
public class SqlSchemaBuilder {
  private List<String> fieldNames = new ArrayList<>();
  private List<SqlFieldSchema> fieldSchemas = new ArrayList<>();

  private SqlSchemaBuilder() {
  }

  public static SqlSchemaBuilder builder() {
    return new SqlSchemaBuilder();
  }

  public SqlSchemaBuilder addField(String name, SqlFieldSchema fieldType) {
    if (name == null || name.isEmpty() || fieldType == null)
      throw new IllegalArgumentException();

    fieldNames.add(name);
    fieldSchemas.add(fieldType);
    return this;
  }

  public SqlSchema build() {
    return new SqlSchema(fieldNames, fieldSchemas);
  }
}