Method loadSmap

java/org/apache/jasper/compiler/SmapUtil.java:685–755

Loads SMAP data for the given class by reading the embedded SourceDebugExtension attribute from the class file or an external .smap resource. @param className the fully qualified class name @param cl the class loader to use for loading the resource @return the parsed SmapStratum, or null if

(String className, ClassLoader cl)

     * @return the parsed SmapStratum, or {@code null} if no or invalid SMAP data is found
     */
    public static SmapStratum loadSmap(String className, ClassLoader cl) {
        // Extract SMAP from class file. First line "SMAP" is not included
        String smap = getSmap(className, cl);

        if (smap == null) {
            return null;
        }

        SmapStratum smapStratum = new SmapStratum();

        String[] lines = smap.split("\n");
        int lineIndex = 0;

        // First line is output file name
        smapStratum.setOutputFileName(lines[lineIndex]);

        // There is only one stratum (JSP) so skip to the start of the file
        // section
        lineIndex = 4;

        while (!lines[lineIndex].equals("*L")) {
            int i = lines[lineIndex].lastIndexOf(' ');
            String fileName = lines[lineIndex].substring(i + 1);
            smapStratum.addFile(fileName, lines[++lineIndex]);
            lineIndex++;
            if (lineIndex == lines.length) {
                return null;
            }
        }

        // Skip *L
        lineIndex++;
        if (lineIndex == lines.length) {
            return null;
        }

        while (!lines[lineIndex].equals("*E")) {
            LineInfo li = new LineInfo();
            // Split into in and out
            String[] inOut = lines[lineIndex].split(":");
            // Split in on comma (might not be one)
            String[] in = inOut[0].split(",");
            if (in.length == 2) {
                // There is a count
                li.setInputLineCount(Integer.parseInt(in[1]));
            }
            // Check for fileID
            String[] start = in[0].split("#");
            if (start.length == 2) {
                // There is a file ID
                li.setLineFileID(Integer.parseInt(start[1]));
            }
            li.setInputStartLine(Integer.parseInt(start[0]));
            // Split out
            String[] out = inOut[1].split(",");
            if (out.length == 2) {
                // There is an increment
                li.setOutputLineIncrement(Integer.parseInt(out[1]));