content: /*
   * 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.mapred.bridge.utils;
  
  import java.io.BufferedInputStream;
  import java.io.IOException;
  import java.util.Iterator;
  
  import com.aliyun.odps.cache.DistributedCache;
  import com.aliyun.odps.data.Record;
  
  @SuppressWarnings("deprecation")
  public final class ResourceUtils {
  
    /**
     * 读取一个名为resourceName的文件资源.
     *
     * @param resourceName
     *     资源名称
     * @return BufferedInputStream 输入流
     * @throws IOException
     */
    public static BufferedInputStream readResourceFileAsStream(String resourceName)
        throws IOException {
      return DistributedCache.readCacheFileAsStream(resourceName);
    }
    
    /**
     * 读取压缩档案类型资源，返回 BufferedInputStream 的迭代器.
     * 
     * @see #readCacheArchive(String)
     * @see DistributedCache#readCacheArchiveAsStream(String)
     * 
     * @param resourceName
     *          资源名称
     * @return BufferedInputStream的迭代器
     * @throws IOException
     *           资源未声明、资源类型不匹配以及其他读取错误抛异常
     */
    public static Iterable<BufferedInputStream> readResourceArchiveFileAsStream(String resourceName) throws IOException {
      return DistributedCache.readCacheArchiveAsStream(resourceName);
    }
    
    /**
     * 读取压缩档案类型资源，返回 BufferedInputStream 的迭代器.
     * 
     * @see #readCacheArchive(String, String)
     * @see DistributedCache#readCacheArchiveAsStream(String, String)
     * 
     * @param resourceName
     *          资源名称
     * @param relativePath
     *          读取资源的相对路径
     * @return BufferedInputStream的迭代器
     * @throws IOException
     *           资源未声明、资源类型不匹配以及其他读取错误抛异常
     */
    public static Iterable<BufferedInputStream> readResourceArchiveFileAsStream(String resourceName, String relativePath)
        throws IOException {
      return DistributedCache.readCacheArchiveAsStream(resourceName, relativePath);
    }
  
    /**
     * 读取一个名为resourceName的资源表
     *
     * @param resourceName
     *     资源名称
     * @return {@link Record}的迭代器
     * @throws IOException
     */
    public static Iterator<Record> readResourceTable(String resourceName)
        throws IOException {
      final Iterator<com.aliyun.odps.Record> itr = DistributedCache
          .readCacheTable(resourceName).iterator();
      return new Iterator<Record>() {
  
        @Override
        public boolean hasNext() {
          return itr.hasNext();
        }
  
        @Override
        public Record next() {
          com.aliyun.odps.Record r = itr.next();
          return VersionUtils.adaptRecord(r);
        }
  
        @Override
        public void remove() {
          itr.remove();
        }
  
      };
  
    }
  }
  