com.highcharts.export.converter.SVGConverter.java Source code

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Here is the source code for com.highcharts.export.converter.SVGConverter.java

Source

/**
 * @license Highcharts JS v2.3.3 (2012-11-02)
 *
 * (c) 20012-2014
 *
 * Author: Gert Vaartjes
 *
 * License: www.highcharts.com/license
 */
package com.highcharts.export.converter;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.net.SocketTimeoutException;
import java.util.HashMap;
import java.util.Map;
import java.util.NoSuchElementException;
import java.util.concurrent.TimeoutException;

import org.apache.commons.codec.binary.Base64;
import org.apache.commons.io.FileUtils;
import org.apache.commons.lang.RandomStringUtils;
import org.apache.log4j.Logger;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.google.gson.Gson;
import com.highcharts.export.pool.PoolException;
import com.highcharts.export.pool.BlockingQueuePool;
import com.highcharts.export.server.Server;
import com.highcharts.export.util.MimeType;

@Service("svgConverter")
public class SVGConverter {

    @Autowired
    private BlockingQueuePool serverPool;
    protected static Logger logger = Logger.getLogger("converter");

    public ByteArrayOutputStream convert(String input, MimeType mime, String constructor, String callback,
            Float width, Float scale)
            throws SVGConverterException, IOException, PoolException, NoSuchElementException, TimeoutException {

        ByteArrayOutputStream stream = null;

        // get filename
        String extension = mime.name().toLowerCase();
        String outFilename = createUniqueFileName("." + extension);

        Map<String, String> params = new HashMap<String, String>();
        Gson gson = new Gson();

        params.put("infile", input);
        params.put("outfile", outFilename);

        if (constructor != null && !constructor.isEmpty()) {
            params.put("constr", constructor);
        }

        if (callback != null && !callback.isEmpty()) {
            params.put("callback", callback);
        }

        if (width != null) {
            params.put("width", String.valueOf(width));
        }

        if (scale != null) {
            params.put("scale", String.valueOf(scale));
        }

        String json = gson.toJson(params);
        String output = requestServer(json);

        // check for errors
        if (output.substring(0, 5).equalsIgnoreCase("error")) {
            logger.debug("recveived error from phantomjs: " + output);
            throw new SVGConverterException("recveived error from phantomjs:" + output);
        }

        stream = new ByteArrayOutputStream();
        if (output.equalsIgnoreCase(outFilename)) {
            // in case of pdf, phantom cannot base64 on pdf files
            stream.write(FileUtils.readFileToByteArray(new File(outFilename)));
        } else {
            // assume phantom is returning SVG or a base64 string for images
            if (extension.equals("svg")) {
                stream.write(output.getBytes());
            } else {
                stream.write(Base64.decodeBase64(output));
            }
        }
        return stream;
    }

    public String requestServer(String params)
            throws SVGConverterException, TimeoutException, NoSuchElementException, PoolException {
        Server server = null;

        try {
            server = (Server) serverPool.borrowObject();
            String response = server.request(params);

            return response;
        } catch (SocketTimeoutException ste) {
            throw new TimeoutException(ste.getMessage());
        } catch (TimeoutException te) {
            throw new TimeoutException(te.getMessage());
        } catch (PoolException nse) {
            logger.error("POOL EXHAUSTED!!");
            throw new PoolException(nse.getMessage());
        } catch (Exception e) {
            logger.debug(e.getMessage());
            throw new SVGConverterException("Error converting SVG" + e.getMessage());
        } finally {
            try {
                serverPool.returnObject(server, true);
            } catch (Exception e) {
                logger.error("Exception while returning server to pool: " + e.getMessage());
            }
        }
    }

    public String createUniqueFileName(String extension) throws IOException {
        return System.getProperty("java.io.tmpdir") + "/" + RandomStringUtils.randomAlphanumeric(8) + extension;
    }
}