Examples with DifferentiationFailedException org.apache.commons.jrcs.diff.DifferentiationFailedException used on opensource projects

Example 1 with DifferentiationFailedException

use of org.apache.commons.jrcs.diff.DifferentiationFailedException in project OpenGrok by OpenGrok.

the class PageConfig method getDiffData.

/**
 * Get all data required to create a diff view w.r.t. to this request in one
 * go.
 *
 * @return an instance with just enough information to render a sufficient
 * view. If not all required parameters were given either they are
 * supplemented with reasonable defaults if possible, otherwise the related
 * field(s) are {@code null}. {@link DiffData#errorMsg}
 *  {@code != null} indicates, that an error occured and one should not try
 * to render a view.
 */
public DiffData getDiffData() {
    DiffData data = new DiffData();
    data.path = getPath().substring(0, path.lastIndexOf('/'));
    data.filename = Util.htmlize(getResourceFile().getName());
    String srcRoot = getSourceRootPath();
    String context = req.getContextPath();
    String[] filepath = new String[2];
    data.rev = new String[2];
    data.file = new String[2][];
    data.param = new String[2];
    /*
         * Basically the request URI looks like this:
         * http://$site/$webapp/diff/$resourceFile?r1=$fileA@$revA&r2=$fileB@$revB
         * The code below extracts file path and revision from the URI.
         */
    for (int i = 1; i <= 2; i++) {
        String p = req.getParameter("r" + i);
        if (p != null) {
            int j = p.lastIndexOf("@");
            if (j != -1) {
                filepath[i - 1] = p.substring(0, j);
                data.rev[i - 1] = p.substring(j + 1);
            }
        }
    }
    if (data.rev[0] == null || data.rev[1] == null || data.rev[0].length() == 0 || data.rev[1].length() == 0 || data.rev[0].equals(data.rev[1])) {
        data.errorMsg = "Please pick two revisions to compare the changed " + "from the <a href=\"" + context + Prefix.HIST_L + getUriEncodedPath() + "\">history</a>";
        return data;
    }
    data.genre = AnalyzerGuru.getGenre(getResourceFile().getName());
    if (data.genre == null || txtGenres.contains(data.genre)) {
        InputStream[] in = new InputStream[2];
        try {
            // Get input stream for both older and newer file.
            for (int i = 0; i < 2; i++) {
                File f = new File(srcRoot + filepath[i]);
                in[i] = HistoryGuru.getInstance().getRevision(f.getParent(), f.getName(), data.rev[i]);
                if (in[i] == null) {
                    data.errorMsg = "Unable to get revision " + Util.htmlize(data.rev[i]) + " for file: " + Util.htmlize(getPath());
                    return data;
                }
            }
            /*
                 * If the genre of the older revision cannot be determined,
                 * (this can happen if the file was empty), try with newer
                 * version.
                 */
            for (int i = 0; i < 2 && data.genre == null; i++) {
                try {
                    data.genre = AnalyzerGuru.getGenre(in[i]);
                } catch (IOException e) {
                    data.errorMsg = "Unable to determine the file type: " + Util.htmlize(e.getMessage());
                }
            }
            if (data.genre != Genre.PLAIN && data.genre != Genre.HTML) {
                return data;
            }
            ArrayList<String> lines = new ArrayList<>();
            Project p = getProject();
            for (int i = 0; i < 2; i++) {
                // SRCROOT is read with UTF-8 as a default.
                try (BufferedReader br = new BufferedReader(ExpandTabsReader.wrap(IOUtils.createBOMStrippedReader(in[i], StandardCharsets.UTF_8.name()), p))) {
                    String line;
                    while ((line = br.readLine()) != null) {
                        lines.add(line);
                    }
                    data.file[i] = lines.toArray(new String[lines.size()]);
                    lines.clear();
                }
                in[i] = null;
            }
        } catch (Exception e) {
            data.errorMsg = "Error reading revisions: " + Util.htmlize(e.getMessage());
        } finally {
            for (int i = 0; i < 2; i++) {
                IOUtils.close(in[i]);
            }
        }
        if (data.errorMsg != null) {
            return data;
        }
        try {
            data.revision = Diff.diff(data.file[0], data.file[1]);
        } catch (DifferentiationFailedException e) {
            data.errorMsg = "Unable to get diffs: " + Util.htmlize(e.getMessage());
        }
        for (int i = 0; i < 2; i++) {
            try {
                URI u = new URI(null, null, null, filepath[i] + "@" + data.rev[i], null);
                data.param[i] = u.getRawQuery();
            } catch (URISyntaxException e) {
                LOGGER.log(Level.WARNING, "Failed to create URI: ", e);
            }
        }
        data.full = fullDiff();
        data.type = getDiffType();
    }
    return data;
}