001/*
002 *
003 * Licensed to the Apache Software Foundation (ASF) under one
004 * or more contributor license agreements.  See the NOTICE file
005 * distributed with this work for additional information
006 * regarding copyright ownership.  The ASF licenses this file
007 * to you under the Apache License, Version 2.0 (the
008 * "License"); you may not use this file except in compliance
009 * with the License.  You may obtain a copy of the License at
010 *
011 *     http://www.apache.org/licenses/LICENSE-2.0
012 *
013 * Unless required by applicable law or agreed to in writing, software
014 * distributed under the License is distributed on an "AS IS" BASIS,
015 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
016 * See the License for the specific language governing permissions and
017 * limitations under the License.
018 */
019
020package org.apache.hadoop.hbase.rest;
021
022import java.io.IOException;
023import java.util.Iterator;
024
025import org.apache.yetus.audience.InterfaceAudience;
026import org.apache.hadoop.hbase.Cell;
027import org.apache.hadoop.hbase.filter.Filter;
028import org.apache.hadoop.hbase.rest.model.ScannerModel;
029
030@InterfaceAudience.Private
031public abstract class ResultGenerator implements Iterator<Cell> {
032
033  public static ResultGenerator fromRowSpec(final String table, 
034      final RowSpec rowspec, final Filter filter, final boolean cacheBlocks)
035      throws IOException {
036    if (rowspec.isSingleRow()) {
037      return new RowResultGenerator(table, rowspec, filter, cacheBlocks);
038    } else {
039      return new ScannerResultGenerator(table, rowspec, filter, cacheBlocks);
040    }
041  }
042
043  public static Filter buildFilter(final String filter) throws Exception {
044    return ScannerModel.buildFilter(filter);
045  }
046
047  public abstract void putBack(Cell kv);
048
049  public abstract void close();
050}