com.twosigma.beakerx.chart.serializer.RastersSerializer.java Source code

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Here is the source code for com.twosigma.beakerx.chart.serializer.RastersSerializer.java

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/*
 *  Copyright 2017 TWO SIGMA OPEN SOURCE, LLC
 *
 *  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.twosigma.beakerx.chart.serializer;

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.twosigma.beakerx.util.SerializerUtil;
import com.twosigma.beakerx.chart.xychart.plotitem.Rasters;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.nio.file.Files;
import org.apache.commons.codec.binary.Base64;
import org.apache.commons.codec.binary.StringUtils;

public class RastersSerializer extends JsonSerializer<Rasters> {

    public static final String TYPE = "type";

    @Override
    public void serialize(Rasters rasters, JsonGenerator jgen, SerializerProvider sp) throws IOException {
        validate(rasters);

        jgen.writeStartObject();

        jgen.writeObjectField(TYPE, SerializerUtil.getTypeName(rasters));
        jgen.writeObjectField("x", rasters.getX());
        jgen.writeObjectField("y", rasters.getY());
        jgen.writeObjectField("opacity", rasters.getOpacity());
        jgen.writeObjectField("visible", rasters.getVisible());
        jgen.writeObjectField("yAxis", rasters.getYAxis());
        jgen.writeObjectField("position", rasters.getPosition());
        jgen.writeObjectField("width", rasters.getWidth());
        jgen.writeObjectField("height", rasters.getHeight());

        // datastring will override file path/url
        if (rasters.getDataString() != null) {
            jgen.writeObjectField("value", Bytes2Base64(rasters.getDataString(), null));
        } else if (!rasters.getFilePath().isEmpty()) {
            String path = rasters.getFilePath();
            File file = new File(path);

            if (!file.exists()) {
                throw new FileNotFoundException("Cannot find file " + path);
            }

            byte[] picture = Files.readAllBytes(new File(path).toPath());
            String extension = "";
            int i = path.lastIndexOf('.');
            if (i > 0) {
                extension = path.substring(i + 1);
            }

            jgen.writeObjectField("value", Bytes2Base64(picture, extension));
        } else if (!rasters.getFileUrl().isEmpty()) {
            jgen.writeObjectField("value", rasters.getFileUrl());
        }

        jgen.writeEndObject();
    }

    private void validate(Rasters raster) {
        if (raster.getY() == null || raster.getY().isEmpty()) {
            throw new IllegalStateException(Messages.PROVIDE_Y_COORDINATE);
        }

        if (raster.getHeight() == null || raster.getHeight().isEmpty()) {
            throw new IllegalStateException(Messages.PROVIDE_HEIGHT);
        }

        if (raster.getWidth() == null || raster.getWidth().isEmpty()) {
            throw new IllegalStateException(Messages.PROVIDE_WIDTH);
        }
    }

    private String Bytes2Base64(byte[] bytes, String format) {
        StringBuilder sb = new StringBuilder();
        if (format != null) {
            sb.append("data:image/").append(format).append(";base64,");
        } else {
            sb.append("data:image/png;base64,");
        }
        sb.append(StringUtils.newStringUtf8(Base64.encodeBase64(bytes, false)));
        return sb.toString();
    }
}