/*
 * 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.hadoop.hive.ql.ddl.workloadmanagement;

import java.io.DataOutputStream;
import java.io.IOException;

import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hive.ql.ddl.DDLOperation;
import org.apache.hadoop.hive.ql.ddl.DDLOperationContext;
import org.apache.hadoop.hive.ql.ddl.DDLUtils;
import org.apache.hadoop.hive.ql.metadata.HiveException;

/**
 * Operation process of showing resource plans.
 */
public class ShowResourcePlanOperation extends DDLOperation {
  private final ShowResourcePlanDesc desc;

  public ShowResourcePlanOperation(DDLOperationContext context, ShowResourcePlanDesc desc) {
    super(context);
    this.desc = desc;
  }

  @Override
  public int execute() throws HiveException, IOException {
    // TODO: Enhance showResourcePlan to display all the pools, triggers and mappings.
    try (DataOutputStream out = DDLUtils.getOutputStream(new Path(desc.getResFile()), context)) {
      String planName = desc.getResourcePlanName();
      if (planName != null) {
        context.getFormatter().showFullResourcePlan(out, context.getDb().getResourcePlan(planName));
      } else {
        context.getFormatter().showResourcePlans(out, context.getDb().getAllResourcePlans());
      }
    }

    return 0;
  }
}
