com.hurence.logisland.processor.hbase.io.JsonRowSerializer.java Source code

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Here is the source code for com.hurence.logisland.processor.hbase.io.JsonRowSerializer.java

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/**
 * Copyright (C) 2016 Hurence (support@hurence.com)
 *
 * Licensed 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.hurence.logisland.processor.hbase.io;

import com.hurence.logisland.service.hbase.scan.ResultCell;
import org.apache.commons.lang3.StringEscapeUtils;

import java.io.IOException;
import java.io.OutputStream;
import java.nio.charset.Charset;

/**
 * Serializes a row from HBase to a JSON document of the form:
 *
 * {
 *  "row" : "row1",
 *  "cells": {
 *      "fam1:qual1" : "val1",
 *      "fam1:qual2" : "val2"
 *  }
 * }
 *
 */
public class JsonRowSerializer implements RowSerializer {

    private final Charset charset;

    public JsonRowSerializer(final Charset charset) {
        this.charset = charset;
    }

    @Override
    public String serialize(byte[] rowKey, ResultCell[] cells) {
        final StringBuilder jsonBuilder = new StringBuilder();
        jsonBuilder.append("{");

        final String row = new String(rowKey, charset);
        jsonBuilder.append("\"row\":").append("\"").append(StringEscapeUtils.escapeJson(row)).append("\"");

        jsonBuilder.append(", \"cells\": {");
        int i = 0;
        for (final ResultCell cell : cells) {
            final String cellFamily = new String(cell.getFamilyArray(), cell.getFamilyOffset(),
                    cell.getFamilyLength(), charset);
            final String cellQualifier = new String(cell.getQualifierArray(), cell.getQualifierOffset(),
                    cell.getQualifierLength(), charset);

            if (i > 0) {
                jsonBuilder.append(", ");
            }
            jsonBuilder.append("\"").append(StringEscapeUtils.escapeJson(cellFamily)).append(":")
                    .append(StringEscapeUtils.escapeJson(cellQualifier)).append("\":\"")
                    .append(StringEscapeUtils.escapeJson(new String(cell.getValueArray(), cell.getValueOffset(),
                            cell.getValueLength(), charset)))
                    .append("\"");
            i++;
        }

        jsonBuilder.append("}}");
        return jsonBuilder.toString();
    }

    @Override
    public void serialize(final byte[] rowKey, final ResultCell[] cells, final OutputStream out)
            throws IOException {
        final String json = serialize(rowKey, cells);
        out.write(json.getBytes(charset));
    }

}