Examples of org.apache.sis.storage.StorageConnector

org.apache.sis.storage.StorageConnector
Information for creating a connection to a {@link DataStore} in read and/or write mode.{@code StorageConnector} wraps an input {@link Object}, which can be any of the following types:
- A {@link java.nio.file.Path} or a {@link java.io.File} or file or a directory in a file system.
- A {@link java.net.URI} or a {@link java.net.URL} to a distant resource.
- A {@link CharSequence} interpreted as a filename or a URL.
- A {@link java.nio.channels.Channel} or a {@link DataInput}.
- A {@link DataSource} or a {@link Connection} to a JDBC database.
- Any other {@code DataStore}-specific object, for example {@link ucar.nc2.NetcdfFile}.
The {@link #getStorageAs(Class)} method provides the storage as an object of the given type, openingthe input stream if necessary. This class tries to open the stream only once - subsequent invocation of {@code getStorageAs(…)} may return the same input stream.
This class is used only for discovery of a {@code DataStore} implementation capable to handle the input.Once a suitable {@code DataStore} has been found, the {@code StorageConnector} instance is typicallydiscarded since each data store implementation will use their own input/output objects.

Instances of this class are serializable if the {@code storage} object given at construction timeis serializable.
@author Martin Desruisseaux (Geomatys) @since 0.3 @version 0.3 @module

        final String file = files.get(0);
        if (file.endsWith(".xml")) {
            final Object obj = XML.unmarshal(new File(file));
            metadata = (obj instanceof Metadata) ? (Metadata) obj : null;
        } else {
            final NetcdfStore store = new NetcdfStore(new StorageConnector(file));
            try {
                metadata = store.getMetadata();
            } finally {
                store.close();
            }

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     *
     * @throws DataStoreException Should never happen.
     */
    @Test
    public void testCanOpenFromStream() throws DataStoreException {
        final StorageConnector c = new StorageConnector(IOTestCase.getResourceAsStream(NCEP));
        final NetcdfStoreProvider provider = new NetcdfStoreProvider();
        assertTrue(provider.canOpen(c));
        c.closeAllExcept(null);
    }

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     * @throws DataStoreException Should never happen.
     */
    @Test
    public void testCanOpenFromUCAR() throws IOException, DataStoreException {
        final NetcdfFile file = open(NCEP);
        final StorageConnector c = new StorageConnector(file);
        final NetcdfStoreProvider provider = new NetcdfStoreProvider();
        assertTrue(provider.canOpen(c));
        file.close();
    }

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     * @throws IOException If an error occurred while opening the NetCDF file.
     * @throws DataStoreException Should never happen.
     */
    @Test
    public void testDecoderFromStream() throws IOException, DataStoreException {
        final StorageConnector c = new StorageConnector(IOTestCase.getResourceAsStream(NCEP));
        final Decoder decoder = NetcdfStoreProvider.decoder(TestCase.LISTENERS, c);
        assertInstanceOf(NCEP, ChannelDecoder.class, decoder);
        decoder.close();
    }

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     * @throws IOException If an error occurred while opening the NetCDF file.
     * @throws DataStoreException Should never happen.
     */
    @Test
    public void testDecoderFromUCAR() throws IOException, DataStoreException {
        final StorageConnector c = new StorageConnector(open(NCEP));
        final Decoder decoder = NetcdfStoreProvider.decoder(TestCase.LISTENERS, c);
        assertInstanceOf(NCEP, DecoderWrapper.class, decoder);
        decoder.close();
    }

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     * @throws DataStoreException If an error occurred while reading the metadata.
     */
    @Test
    public void testMetadata() throws DataStoreException {
        final Metadata metadata;
        final XMLStore store = new XMLStore(new StorageConnector(new StringReader(XML)));
        try {
            metadata = store.getMetadata();
            assertSame("Expected cached value.", metadata, store.getMetadata());
        } finally {
            store.close();

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     * @throws DataStoreException Should never happen.
     */
    @Test
    public void testProbeContentFromReader() throws DataStoreException {
        final XMLStoreProvider p = new XMLStoreProvider();
        final StorageConnector c = new StorageConnector(new StringReader(XMLStoreTest.XML));
        final ProbeResult      r = p.probeContent(c);
        c.closeAllExcept(null);
        assertTrue  ("isSupported()", r.isSupported());
        assertEquals("getMimeType()", "application/vnd.iso.19139+xml", r.getMimeType());
    }

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     *
     * @throws DataStoreException Should never happen.
     */
    @Test
    public void testProbeContentFromStream() throws DataStoreException {
        final StorageConnector c = new StorageConnector(IOTestCase.getResourceAsStream(NCEP));
        final NetcdfStoreProvider provider = new NetcdfStoreProvider();
        final ProbeResult probe = provider.probeContent(c);
        assertTrue  ("isSupported", probe.isSupported());
        assertEquals("getMimeType", NetcdfStoreProvider.MIME_TYPE, probe.getMimeType());
        assertEquals("getVersion",  new Version("1"), probe.getVersion());
        c.closeAllExcept(null);
    }

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     * @throws DataStoreException Should never happen.
     */
    @Test
    public void testProbeContentFromUCAR() throws IOException, DataStoreException {
        final NetcdfFile file = open(NCEP);
        final StorageConnector c = new StorageConnector(file);
        final NetcdfStoreProvider provider = new NetcdfStoreProvider();
        final ProbeResult probe = provider.probeContent(c);
        assertTrue  ("isSupported", probe.isSupported());
        assertEquals("getMimeType", NetcdfStoreProvider.MIME_TYPE, probe.getMimeType());
        assertNull  ("getVersion",  probe.getVersion());

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     * @throws IOException If an error occurred while opening the NetCDF file.
     * @throws DataStoreException Should never happen.
     */
    @Test
    public void testDecoderFromStream() throws IOException, DataStoreException {
        final StorageConnector c = new StorageConnector(IOTestCase.getResourceAsStream(NCEP));
        final Decoder decoder = NetcdfStoreProvider.decoder(TestCase.LISTENERS, c);
        assertInstanceOf(NCEP, ChannelDecoder.class, decoder);
        decoder.close();
    }

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