@Override
    public void parse(InputStream stream, ContentHandler handler, Metadata metadata,
                      ParseContext context) throws IOException, SAXException, TikaException {

        if (!ExternalParser.check("gdalinfo")) {
            return;
        }

        // first set up and run GDAL
        // process the command
        TemporaryResources tmp = new TemporaryResources();
        TikaInputStream tis = TikaInputStream.get(stream, tmp, metadata);

        String runCommand = processCommand(tis);
        String output = execCommand(new String[]{runCommand});

        // now extract the actual metadata params
        // from the GDAL output in the content stream
        // to do this, we need to literally process the output
        // from the invoked command b/c we can't read metadata and
        // output text from the handler in ExternalParser
        // at the same time, so for now, we can't use the
        // ExternalParser to do this and I've had to bring some of
        // that functionality directly into this class
        // TODO: investigate a way to do both using ExternalParser

        extractMetFromOutput(output, metadata);
        applyPatternsToOutput(output, metadata, getPatterns());

        // make the content handler and provide output there
        // now that we have metadata
        processOutput(handler, metadata, output);
    }
@Test
    public void testParseMetadata() {
        assumeTrue(canRun());
        final String expectedNcInst =
                "NCAR (National Center for Atmospheric Research, Boulder, CO, USA)";
        final String expectedModelNameEnglish = "NCAR CCSM";
        final String expectedProgramId = "Source file unknown Version unknown Date unknown";
        final String expectedProjectId = "IPCC Fourth Assessment";
        final String expectedRealization = "1";
        final String expectedTitle = "model output prepared for IPCC AR4";
        final String expectedSub8Name = "\":ua";
        final String expectedSub8Desc = "[1x17x128x256] eastward_wind (32-bit floating-point)";

        GDALParser parser = new GDALParser();
        InputStream stream = TestGDALParser.class
                .getResourceAsStream("/test-documents/sresa1b_ncar_ccsm3_0_run1_200001.nc");
        Metadata met = new Metadata();
        BodyContentHandler handler = new BodyContentHandler();
        try {
            parser.parse(stream, handler, met, new ParseContext());
            assertNotNull(met);
            assertNotNull(met.get("NC_GLOBAL#institution"));
            assertEquals(expectedNcInst, met.get("NC_GLOBAL#institution"));
            assertNotNull(met.get("NC_GLOBAL#model_name_english"));
            assertEquals(expectedModelNameEnglish, met.get("NC_GLOBAL#model_name_english"));
            assertNotNull(met.get("NC_GLOBAL#prg_ID"));
            assertEquals(expectedProgramId, met.get("NC_GLOBAL#prg_ID"));
            assertNotNull(met.get("NC_GLOBAL#prg_ID"));
            assertEquals(expectedProgramId, met.get("NC_GLOBAL#prg_ID"));
            assertNotNull(met.get("NC_GLOBAL#project_id"));
            assertEquals(expectedProjectId, met.get("NC_GLOBAL#project_id"));
            assertNotNull(met.get("NC_GLOBAL#realization"));
            assertEquals(expectedRealization, met.get("NC_GLOBAL#realization"));
            assertNotNull(met.get("NC_GLOBAL#title"));
            assertEquals(expectedTitle, met.get("NC_GLOBAL#title"));
            assertNotNull(met.get("SUBDATASET_8_NAME"));
            assertTrue(met.get("SUBDATASET_8_NAME").endsWith(expectedSub8Name));
            assertNotNull(met.get("SUBDATASET_8_DESC"));
            assertEquals(expectedSub8Desc, met.get("SUBDATASET_8_DESC"));
        } catch (Exception e) {
            e.printStackTrace();
            fail(e.getMessage());
        }
    }