Thibau/datalift-sdmxdatacube

package org.datalift.sdmxdatacube.utils;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;

/**
 * Utility for SDMX files
 *
 * @author thibaut
 *
 */
public class SdmxFileUtils {

    /**
     * Check if a Reader contains Sdmx XML
     *
     * @param i
     *            the Reader
     * @return True if i contains SDMX XML, else false
     * @throws IOException
     */
    public static boolean isSdmx(InputStream is) throws IOException {
        BufferedReader in = new BufferedReader(new InputStreamReader(is));
        String line = null;
        boolean comment = false;
        int max_line = 100;
        String uri_sdmx = "http://www.sdmx.org/resources/sdmxml/schemas/v2_1/";

        while ((line = in.readLine()) != null && max_line > 0) {
            if (comment) {
                if (line.contains("-->"))
                    comment = false;
            } else {
                if (line.contains("<!--") && line.contains("-->"))
                    comment = false;
                else if (line.contains("<!--"))
                    comment = true;
            }

            if (!comment) {
                --max_line;
                if (line.contains(uri_sdmx))
                    return true;
            }
        }
        return false;
    }
}