com.esri.geoportal.harvester.api.base.DataReferenceSerializer.java Source code

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Here is the source code for com.esri.geoportal.harvester.api.base.DataReferenceSerializer.java

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/*
 * Copyright 2016 Esri, Inc.
 *
 * 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.esri.geoportal.harvester.api.base;

import com.esri.geoportal.commons.constants.MimeType;
import com.esri.geoportal.harvester.api.DataReference;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintStream;
import java.net.URI;
import java.net.URISyntaxException;
import java.time.Instant;
import java.time.OffsetDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;
import java.util.Base64;
import java.util.Calendar;
import java.util.Date;
import org.apache.commons.lang3.StringUtils;

/**
 * Data reference serializer.
 */
public class DataReferenceSerializer {

    private final static Base64.Encoder ENCODER = Base64.getEncoder();
    private final static Base64.Decoder DECODER = Base64.getDecoder();
    private final static DateTimeFormatter FORMATTER = DateTimeFormatter.ISO_OFFSET_DATE_TIME;

    /**
     * Serializes data reference
     *
     * @param out output print stream
     * @param ref data reference
     * @throws IOException if serialization fails
     */
    public void serialize(PrintStream out, DataReference ref) throws IOException {

        byte[] bBrokerUri = ENCODER.encode(ref.getBrokerUri().toASCIIString().getBytes("UTF-8"));
        byte[] bBrokerName = ENCODER.encode(StringUtils.trimToEmpty(ref.getBrokerName()).getBytes("UTF-8"));
        byte[] bId = ENCODER.encode(ref.getId().getBytes("UTF-8"));
        byte[] bLastModifiedDate = ENCODER
                .encode((ref.getLastModifiedDate() != null ? formatIsoDate(ref.getLastModifiedDate()) : "")
                        .getBytes("UTF-8"));
        byte[] bSourceUri = ENCODER.encode(ref.getSourceUri().toASCIIString().getBytes("UTF-8"));
        byte[] bContent = ENCODER.encode(ref.getContent());
        byte[] bContentType = ENCODER.encode(
                ref.getContentType() != null ? ref.getContentType().toString().getBytes("UTF-8") : new byte[0]);

        out.write(bBrokerUri);
        out.write(',');
        out.write(bBrokerName);
        out.write(',');
        out.write(bId);
        out.write(',');
        out.write(bLastModifiedDate);
        out.write(',');
        out.write(bSourceUri);
        out.write(',');
        out.write(bContentType);
        out.write(',');
        out.write(bContent);
        out.write('\r');
        out.write('\n');
        out.flush();
    }

    /**
     * De-serializes data reference
     *
     * @param input input stream
     * @return data reference
     * @throws IOException if de-serialization fails
     * @throws URISyntaxException if de-serialization fails
     */
    public DataReference deserialize(InputStream input) throws IOException, URISyntaxException {
        BufferedReader reader = new BufferedReader(new InputStreamReader(input, "UTF-8"));
        String line = reader.readLine();
        if (line != null) {
            String[] split = line.split(",");
            if (split.length == 7) {
                int i = 0;
                byte[] bBrokerUri = DECODER.decode(split[i++].getBytes("UTF-8"));
                byte[] bBrokerName = DECODER.decode(split[i++].getBytes("UTF-8"));
                byte[] bId = DECODER.decode(split[i++].getBytes("UTF-8"));
                byte[] bLastModifiedDate = DECODER.decode(split[i++].getBytes("UTF-8"));
                byte[] bSourceUri = DECODER.decode(split[i++].getBytes("UTF-8"));
                byte[] bContentType = DECODER.decode(split[i++].getBytes("UTF-8"));
                byte[] bContent = DECODER.decode(split[i++].getBytes("UTF-8"));

                URI brokerUri = URI.create(new String(bBrokerUri, "UTF-8"));
                String sBrokerName = new String(bBrokerName, "UTF-8");
                String sId = new String(bId, "UTF-8");
                String sLastModifiedDate = new String(bLastModifiedDate, "UTF-8");
                URI sourceUri = URI.create(new String(bSourceUri, "UTF-8"));

                Date lastModifiedDate = !sLastModifiedDate.isEmpty()
                        ? Date.from(OffsetDateTime.from(FORMATTER.parse(sLastModifiedDate)).toInstant())
                        : null;
                MimeType contentType = MimeType.parse(new String(bContentType, "UTF-8"));

                return new SimpleDataReference(brokerUri, sBrokerName, sId, lastModifiedDate, sourceUri, bContent,
                        contentType);
            }
        }
        return null;
    }

    private String formatIsoDate(Date date) {
        Instant instant = date.toInstant();
        Calendar cal = Calendar.getInstance();
        cal.setTime(date);
        ZoneOffset zoneOffset = ZoneOffset.ofHours(cal.getTimeZone().getRawOffset() / (1000 * 60 * 60));
        OffsetDateTime ofInstant = OffsetDateTime.ofInstant(instant, zoneOffset);
        return FORMATTER.format(ofInstant);
    }
}