Examples of org.apache.sis.xml.ValueConverter

org.apache.sis.xml.ValueConverter
Performs conversions of XML element or attribute values encountered during XML (un)marshalling. Each method in this class is a converter and can be invoked at (un)marshalling time. The default implementation is straightforward and documented in the javadoc of each method.
This class provides a way to handle the errors which may exist in some XML documents. For example a URL in the document may be malformed, causing a {@link MalformedURLException}to be thrown. If this error is not handled, it will cause the (un)marshalling of the entire document to fail. An application may want to change this behavior by replacing URLs that are known to be erroneous by fixed versions of those URLs. Example:
{@preformat java}class URLFixer extends ValueConverter @Override public URL toURL(MarshalContext context, URI uri) throws MalformedURLException { try { return super.toURL(context, uri); } catch (MalformedURLException e) { if (uri.equals(KNOWN_ERRONEOUS_URI) { return FIXED_URL; } else { throw e; } } } } } See the {@link XML#CONVERTER} javadoc for an example of registering a custom{@code ValueConverter} to a (un)marshaller. @author Martin Desruisseaux (Geomatys) @since 0.3 (derived from geotk-3.07) @version 0.3 @module

         * Try to guess if the UOM is a URN or URL. We looks for character that are usually
         * part of URI but not part of unit symbols, for example ':'. We can not search for
         * '/' and '.' since they are part of UCUM representation.
         */
        final Context context = Context.current();
        final ValueConverter converter = Context.converter(context);
        if (uom.indexOf(':') >= 0) {
            final URI uri = converter.toURI(context, uom);
            String part = uri.getFragment();
            if (part != null) {
                uom = part;
                int i = uom.lastIndexOf("@gml:id=");
                if (i >= 0) {
                    i += 8; // 8 is the length of "@gml:id="
                    for (final int length=uom.length(); i<length;) {
                        final int c = uom.codePointAt(i);
                        if (!Character.isWhitespace(c)) {
                            if (c == '\'') i++;
                            break;
                        }
                        i += Character.charCount(c);
                    }
                    final int stop = uom.lastIndexOf('\'');
                    uom = CharSequences.trimWhitespaces((stop > i) ? uom.substring(i, stop) : uom.substring(i));
                }
            } else if ((part = uri.getPath()) != null) {
                uom = new File(part).getName();
            }
        }
        unit = converter.toUnit(context, uom);
    }

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     * @param  context The current context, or {@code null} if none.
     * @return The current value converter (never null).
     */
    public static ValueConverter converter(final Context context) {
        if (context != null) {
            final ValueConverter converter = context.converter;
            if (converter != null) {
                return converter;
            }
        }
        return ValueConverter.DEFAULT;

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     *
     * @throws IllegalArgumentException If the UUID is already assigned to an other object.
     */
    private void setUUID(String id) {
        final Context context = Context.current();
        final ValueConverter converter = Context.converter(context);
        final UUID uuid;
        try {
            uuid = converter.toUUID(context, id);
        } catch (IllegalArgumentException e) {
            // IF we can not store the value as a UUID, store it as a String.
            Context.warningOccured(context, this, ISOMetadata.class, "setUUID", e, false);
            id = CharSequences.trimWhitespaces(id);
            if (id != null && !id.isEmpty()) {

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            }
            case NonMarshalledAuthority.HREF: {
                URI uri = null;
                if (code != null) {
                    context = Context.current();
                    final ValueConverter converter = Context.converter(context);
                    try {
                        uri = converter.toURI(context, code);
                    } catch (URISyntaxException e) {
                        exception = e;
                        removed = setHRef(null);
                        type = URI.class;
                        break;

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                case NonMarshalledAuthority.ID: {
                    return new SpecializedIdentifier<String>(IdentifierSpace.ID, code);
                }
                case NonMarshalledAuthority.UUID: {
                    final Context context = Context.current();
                    final ValueConverter converter = Context.converter(context);
                    try {
                        return new SpecializedIdentifier<UUID>(IdentifierSpace.UUID, converter.toUUID(context, code));
                    } catch (IllegalArgumentException e) {
                        parseFailure(context, code, UUID.class, e);
                        break;
                    }
                }
                case NonMarshalledAuthority.HREF:
                case NonMarshalledAuthority.XLINK: {
                    final Context context = Context.current();
                    final ValueConverter converter = Context.converter(context);
                    final URI href;
                    try {
                        href = converter.toURI(context, code);
                    } catch (URISyntaxException e) {
                        parseFailure(context, code, URI.class, e);
                        break;
                    }
                    if (ordinal == NonMarshalledAuthority.HREF) {

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     * @param  context The current context, or {@code null} if none.
     * @return The current value converter (never null).
     */
    public static ValueConverter converter(final Context context) {
        if (context != null) {
            final ValueConverter converter = context.converter;
            if (converter != null) {
                return converter;
            }
        }
        return ValueConverter.DEFAULT;

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