/*
 * 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.eagle.log.entity.old;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import org.apache.eagle.log.base.taggedlog.TaggedLogAPIEntity;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import org.apache.eagle.log.base.taggedlog.TaggedLogObjectMapper;
import org.apache.eagle.log.entity.InternalLog;
import org.apache.eagle.common.EagleBase64Wrapper;

public class GenericByRowkeyReader {
    private static final Logger LOG = LoggerFactory.getLogger(GenericByRowkeyReader.class);

    private TaggedLogObjectMapper mapper;
    private String table;
    private String columnFamily;
    private boolean outputAll;
    private List<String> outputColumns;
    private GenericReader.EntityFactory entityFactory;

    public GenericByRowkeyReader(TaggedLogObjectMapper mapper, GenericReader.EntityFactory entityFactory,
                                 String table, String columnFamily, boolean outputAll,
                                 List<String> outputColumns) {
        this.mapper = mapper;
        this.entityFactory = entityFactory;
        this.table = table;
        this.columnFamily = columnFamily;
        this.outputAll = outputAll;
        this.outputColumns = outputColumns;
    }

    public List<TaggedLogAPIEntity> read(List<String> rowkeys) throws IOException {
        HBaseLogByRowkeyReader reader = new HBaseLogByRowkeyReader(this.table, this.columnFamily, outputAll,
                                                                   outputColumns);
        List<TaggedLogAPIEntity> entities = new ArrayList<TaggedLogAPIEntity>();
        try {
            reader.open();
            for (String rowkeyString : rowkeys) {
                byte[] rowkey = EagleBase64Wrapper.decode(rowkeyString);
                InternalLog log = reader.get(rowkey);
                TaggedLogAPIEntity entity = entityFactory.create();
                entities.add(entity);
                entity.setTags(log.getTags());
                entity.setTimestamp(log.getTimestamp());
                entity.setEncodedRowkey(log.getEncodedRowkey());
                entity.setPrefix(log.getPrefix());
                Map<String, byte[]> qualifierValues = log.getQualifierValues();
                mapper.populateQualifierValues(entity, qualifierValues);
            }
        } catch (IOException ex) {
            LOG.error("Fail read by rowkey", ex);
            throw ex;
        } finally {
            reader.close();
        }

        return entities;
    }
}