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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 com.aliyun.odps.udf.local.datasource;
  
  import java.io.File;
  import java.io.IOException;
  import java.io.PrintWriter;
  
  import com.aliyun.odps.Column;
  import com.aliyun.odps.PartitionSpec;
  import com.aliyun.odps.local.common.WareHouse;
  import com.aliyun.odps.local.common.utils.PartitionUtils;
  import com.aliyun.odps.udf.UDTFCollector;
  import com.aliyun.odps.udf.local.LocalRunError;
  
  public class UDTFTableCollector implements UDTFCollector {
  
    PrintWriter pw;
    Column[] schema;
  
    public UDTFTableCollector(String project, String table, String[] partitions) throws IOException {
      PartitionSpec partitionSpec = null;
      if (partitions != null && partitions.length > 0) {
        partitionSpec = new PartitionSpec();
        for (String p : partitions) {
          String[] kv = p.split("=");
          if (kv.length != 2) {
            throw new LocalRunError("Invalid partition:" + p + " of table " + project + "." + table);
          }
          partitionSpec.set(kv[0], kv[1]);
        }
      }
  
      WareHouse wareHouse = WareHouse.getInstance();
      if (partitions != null) {
        if (!wareHouse.existsPartition(project, table, partitionSpec)) {
          throw new LocalRunError(
              "partition " + project + "." + table + "(" + PartitionUtils.toString(partitionSpec)
              + ") not exists");
        }
        File partitionDir = wareHouse.getPartitionDir(project, table, partitionSpec);
        pw = new PrintWriter(new File(partitionDir, "data"));
      } else {
        if (!wareHouse.existsTable(project, table)) {
          throw new LocalRunError("output table:" + project + "." + table + " not exists");
        }
        File tableDir = wareHouse.getTableDir(project, table);
        pw = new PrintWriter(new File(tableDir, "data"));
      }
  
      schema = wareHouse.getTableMeta(project, table).getCols();
  
    }
  
    @Override
    public void collect(Object[] args) {
  
    }
  
  }
  