pig/src/main/java/org/apache/calcite/adapter/pig/PigSchemaFactory.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.calcite.adapter.pig;

import org.apache.calcite.schema.Schema;
import org.apache.calcite.schema.SchemaFactory;
import org.apache.calcite.schema.SchemaPlus;

import java.util.Map;

/**
 * Factory that creates a {@link PigSchema}.
 *
 * <p>Allows a custom schema to be included in a <code><i>model</i>.json</code>
 * file.
 */
public class PigSchemaFactory implements SchemaFactory {

  /** Public singleton, per factory contract. */
  public static final PigSchemaFactory INSTANCE = new PigSchemaFactory();

  private PigSchemaFactory() {
  }

  @Override public Schema create(SchemaPlus parentSchema, String name,
      Map<String, Object> operand) {
    return new PigSchema();
  }
}