Examples with SaveOnReadInputStream org.teiid.dqp.internal.process.SaveOnReadInputStream used on opensource projects

Example 1 with SaveOnReadInputStream

use of org.teiid.dqp.internal.process.SaveOnReadInputStream in project teiid by teiid.

the class ConnectorWorkItem method convertToRuntimeType.

static Object convertToRuntimeType(BufferManager bm, Object value, Class<?> desiredType, CommandContext context) throws TransformationException {
    if (desiredType != DataTypeManager.DefaultDataClasses.XML || !(value instanceof Source)) {
        if (value instanceof DataSource) {
            final DataSource ds = (DataSource) value;
            try {
                // Teiid uses the datasource interface in a degenerate way that
                // reuses the stream, so we test for that here
                InputStream initial = ds.getInputStream();
                InputStream other = null;
                try {
                    other = ds.getInputStream();
                } catch (IOException e) {
                // likely streaming
                }
                if (other != null && initial != other) {
                    initial.close();
                    other.close();
                    if (value instanceof InputStreamFactory) {
                        return asLob((InputStreamFactory) value, desiredType);
                    }
                    return asLob(new InputStreamFactory() {

                        @Override
                        public InputStream getInputStream() throws IOException {
                            return ds.getInputStream();
                        }
                    }, desiredType);
                }
                // $NON-NLS-1$
                FileStore fs = bm.createFileStore("bytes");
                // TODO: guess at the encoding from the content type
                FileStoreInputStreamFactory fsisf = new FileStoreInputStreamFactory(fs, Streamable.ENCODING);
                SaveOnReadInputStream is = new SaveOnReadInputStream(initial, fsisf);
                if (context != null) {
                    context.addCreatedLob(fsisf);
                }
                return asLob(is.getInputStreamFactory(), desiredType);
            } catch (IOException e) {
                throw new TransformationException(QueryPlugin.Event.TEIID30500, e, e.getMessage());
            }
        }
        if (value instanceof InputStreamFactory) {
            return asLob((InputStreamFactory) value, desiredType);
        }
        if (value instanceof GeometryInputSource) {
            GeometryInputSource gis = (GeometryInputSource) value;
            try {
                InputStream is = gis.getEwkb();
                if (is != null) {
                    return GeometryUtils.geometryFromEwkb(is, gis.getSrid());
                }
            } catch (Exception e) {
                throw new TransformationException(e);
            }
            try {
                Reader r = gis.getGml();
                if (r != null) {
                    return GeometryUtils.geometryFromGml(r, gis.getSrid());
                }
            } catch (Exception e) {
                throw new TransformationException(e);
            }
        }
    }
    if (value instanceof Source) {
        if (!(value instanceof InputStreamFactory)) {
            if (value instanceof StreamSource) {
                StreamSource ss = (StreamSource) value;
                InputStream is = ss.getInputStream();
                Reader r = ss.getReader();
                if (is == null && r != null) {
                    is = new ReaderInputStream(r, Streamable.CHARSET);
                }
                // $NON-NLS-1$
                final FileStore fs = bm.createFileStore("xml");
                final FileStoreInputStreamFactory fsisf = new FileStoreInputStreamFactory(fs, Streamable.ENCODING);
                value = new SaveOnReadInputStream(is, fsisf).getInputStreamFactory();
                if (context != null) {
                    context.addCreatedLob(fsisf);
                }
            } else if (value instanceof StAXSource) {
                // TODO: do this lazily.  if the first access to get the STaXSource, then
                // it's more efficient to let the processing happen against STaX
                StAXSource ss = (StAXSource) value;
                try {
                    // $NON-NLS-1$
                    final FileStore fs = bm.createFileStore("xml");
                    final FileStoreInputStreamFactory fsisf = new FileStoreInputStreamFactory(fs, Streamable.ENCODING);
                    value = new SaveOnReadInputStream(new XMLInputStream(ss, XMLSystemFunctions.getOutputFactory(true)), fsisf).getInputStreamFactory();
                    if (context != null) {
                        context.addCreatedLob(fsisf);
                    }
                } catch (XMLStreamException e) {
                    throw new TransformationException(e);
                }
            } else {
                // maybe dom or some other source we want to get out of memory
                StandardXMLTranslator sxt = new StandardXMLTranslator((Source) value);
                SQLXMLImpl sqlxml;
                try {
                    sqlxml = XMLSystemFunctions.saveToBufferManager(bm, sxt, context);
                } catch (TeiidComponentException e) {
                    throw new TransformationException(e);
                } catch (TeiidProcessingException e) {
                    throw new TransformationException(e);
                }
                return new XMLType(sqlxml);
            }
        }
        return new XMLType(new SQLXMLImpl((InputStreamFactory) value));
    }
    return DataTypeManager.convertToRuntimeType(value, desiredType != DataTypeManager.DefaultDataClasses.OBJECT);
}