com.smartitengineering.event.hub.spi.hbase.persistents.Utils.java Source code

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Here is the source code for com.smartitengineering.event.hub.spi.hbase.persistents.Utils.java

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/*
It is a application for event distribution to event n-consumers with m-sources.
Copyright (C) 2010 "Imran M Yousuf <imran@smartitengineering.com>"
    
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or any later
version.
    
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.
    
You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package com.smartitengineering.event.hub.spi.hbase.persistents;

import java.io.DataInput;
import java.io.EOFException;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.nio.ByteBuffer;
import java.util.Arrays;
import java.util.Collections;
import java.util.Date;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Map.Entry;
import org.apache.commons.codec.binary.StringUtils;
import org.apache.commons.lang.time.DateFormatUtils;
import org.apache.commons.lang.time.DateUtils;
import org.apache.hadoop.hbase.util.Bytes;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 *
 * @author imyousuf
 */
public final class Utils {

    private static final Logger logger = LoggerFactory.getLogger(Utils.class);

    private Utils() {
    }

    public static byte[] toBytes(final Date date) {
        if (date == null) {
            return new byte[0];
        }
        try {
            return StringUtils.getBytesUtf8(DateFormatUtils.ISO_DATETIME_TIME_ZONE_FORMAT.format(date));
        } catch (Exception ex) {
            throw new RuntimeException(ex);
        }
    }

    public static Date toDate(final byte[] dateBytes) {
        try {
            String dateString = StringUtils.newStringUtf8(dateBytes);
            return DateUtils.parseDate(dateString,
                    new String[] { DateFormatUtils.ISO_DATETIME_TIME_ZONE_FORMAT.getPattern() });
        } catch (Exception ex) {
            throw new RuntimeException(ex);
        }
    }

    public static void organizeByPrefix(Map<byte[], byte[]> fieldMap, Map<String, Map<String, byte[]>> fieldsByName,
            char separator) {
        logger.info("Organize by their prefix so that each field cells can be processed at once");
        for (Entry<byte[], byte[]> entry : fieldMap.entrySet()) {
            final String key = Bytes.toString(entry.getKey());
            final int indexOfFirstColon = key.indexOf(separator);
            if (indexOfFirstColon > -1) {
                final String fieldName = key.substring(0, indexOfFirstColon);
                final byte[] fieldNameBytes = Bytes.toBytes(fieldName);
                if (Bytes.startsWith(entry.getKey(), fieldNameBytes)) {
                    Map<String, byte[]> fieldCells = fieldsByName.get(fieldName);
                    if (fieldCells == null) {
                        fieldCells = new LinkedHashMap<String, byte[]>();
                        fieldsByName.put(fieldName, fieldCells);
                    }
                    fieldCells.put(Bytes.toString(entry.getKey()), entry.getValue());
                }
            } else {
                fieldsByName.put(key, Collections.singletonMap(Bytes.toString(entry.getKey()), entry.getValue()));
            }
        }
    }

    public static String readStringInUTF8(DataInput in) throws IOException, UnsupportedEncodingException {
        int allocationBlockSize = 2000;
        int capacity = allocationBlockSize;
        int length = 0;
        ByteBuffer buffer = ByteBuffer.allocate(allocationBlockSize);
        boolean notEof = true;
        while (notEof) {
            try {
                buffer.put(in.readByte());
                if (++length >= capacity) {
                    capacity += allocationBlockSize;
                    buffer.limit(capacity);
                }
            } catch (EOFException ex) {
                notEof = false;
            }
        }
        String string = StringUtils.newStringUtf8(Arrays.copyOf(buffer.array(), length));
        return string;
    }
}