Examples of org.apache.camel.TypeConverter

org.apache.camel.TypeConverter
emq.apache.org/camel/type-converter.html">to different types such as to and from String, InputStream/OutputStream, Reader/Writer, Document, byte[], ByteBuffer etc @version $Revision: 563607 $


                // register fallback converters
                URL fallbackUrl = bundle.getEntry(META_INF_FALLBACK_TYPE_CONVERTER);
                if (fallbackUrl != null) {
                    LOG.debug("Found {} to load the FallbackTypeConverter", META_INF_FALLBACK_TYPE_CONVERTER);
                    TypeConverter tc = createInstance("FallbackTypeConverter", fallbackUrl, registry.getInjector());
                    registry.addFallbackTypeConverter(tc, false);
                }


                // now clear the maps so we do not hold references
                visitedClasses.clear();

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                return Void.TYPE;
            }
        }


        // try to find a suitable type converter
        TypeConverter converter = getOrFindTypeConverter(type, value);
        if (converter != null) {
            log.trace("Using converter: {} to convert {}", converter, key);
            Object rc;
            if (tryConvert) {
                rc = converter.tryConvertTo(type, exchange, value);
            } else {
                rc = converter.convertTo(type, exchange, value);
            }
            if (rc == null && converter.allowNull()) {
                return null;
            } else if (rc != null) {
                return rc;
            }
        }


        // not found with that type then if it was a primitive type then try again with the wrapper type
        if (type.isPrimitive()) {
            Class<?> primitiveType = ObjectHelper.convertPrimitiveTypeToWrapperType(type);
            if (primitiveType != type) {
                Class<?> fromType = value.getClass();
                TypeConverter tc = getOrFindTypeConverter(primitiveType, value);
                if (tc != null) {
                    // add the type as a known type converter as we can convert from primitive to object converter
                    addTypeConverter(type, fromType, tc);
                    Object rc;
                    if (tryConvert) {
                        rc = tc.tryConvertTo(primitiveType, exchange, value);
                    } else {
                        rc = tc.convertTo(primitiveType, exchange, value);
                    }
                    if (rc == null && tc.allowNull()) {
                        return null;
                    } else if (rc != null) {
                        return rc;
                    }
                }
            }
        }


        // fallback converters
        for (FallbackTypeConverter fallback : fallbackConverters) {
            TypeConverter tc = fallback.getFallbackTypeConverter();
            Object rc;
            if (tryConvert) {
                rc = tc.tryConvertTo(type, exchange, value);
            } else {
                rc = tc.convertTo(type, exchange, value);
            }
            if (rc == null && tc.allowNull()) {
                return null;
            }


            if (Void.TYPE.equals(rc)) {
                // it cannot be converted so give up

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    @Override
    public void addTypeConverter(Class<?> toType, Class<?> fromType, TypeConverter typeConverter) {
        log.trace("Adding type converter: {}", typeConverter);
        TypeMapping key = new TypeMapping(toType, fromType);
        TypeConverter converter = typeMappings.get(key);
        // only override it if its different
        // as race conditions can lead to many threads trying to promote the same fallback converter
        if (typeConverter != converter) {
            if (converter != null) {
                log.warn("Overriding type converter from: " + converter + " to: " + typeConverter);

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    @Override
    public boolean removeTypeConverter(Class<?> toType, Class<?> fromType) {
        log.trace("Removing type converter from: {} to: {}", fromType, toType);
        TypeMapping key = new TypeMapping(toType, fromType);
        TypeConverter converter = typeMappings.remove(key);
        if (converter != null) {
            typeMappings.remove(key);
            misses.remove(key);
        }
        return converter != null;

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        Class<?> fromType = null;
        if (value != null) {
            fromType = value.getClass();
        }
        TypeMapping key = new TypeMapping(toType, fromType);
        TypeConverter converter = typeMappings.get(key);
        if (converter == null) {
            // converter not found, try to lookup then
            converter = lookup(toType, fromType);
            if (converter != null) {
                typeMappings.putIfAbsent(key, converter);

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    protected TypeConverter doLookup(Class<?> toType, Class<?> fromType, boolean isSuper) {


        if (fromType != null) {
            // lets try if there is a direct match
            TypeConverter converter = getTypeConverter(toType, fromType);
            if (converter != null) {
                return converter;
            }


            // try the interfaces
            for (Class<?> type : fromType.getInterfaces()) {
                converter = getTypeConverter(toType, type);
                if (converter != null) {
                    return converter;
                }
            }


            // try super then
            Class<?> fromSuperClass = fromType.getSuperclass();
            if (fromSuperClass != null && !fromSuperClass.equals(Object.class)) {
                converter = doLookup(toType, fromSuperClass, true);
                if (converter != null) {
                    return converter;
                }
            }
        }


        // only do these tests as fallback and only on the target type (eg not on its super)
        if (!isSuper) {
            if (fromType != null && !fromType.equals(Object.class)) {


                // lets try classes derived from this toType
                Set<Map.Entry<TypeMapping, TypeConverter>> entries = typeMappings.entrySet();
                for (Map.Entry<TypeMapping, TypeConverter> entry : entries) {
                    TypeMapping key = entry.getKey();
                    Class<?> aToType = key.getToType();
                    if (toType.isAssignableFrom(aToType)) {
                        Class<?> aFromType = key.getFromType();
                        // skip Object based we do them last
                        if (!aFromType.equals(Object.class) && aFromType.isAssignableFrom(fromType)) {
                            return entry.getValue();
                        }
                    }
                }


                // lets test for Object based converters as last resort
                TypeConverter converter = getTypeConverter(toType, Object.class);
                if (converter != null) {
                    return converter;
                }
            }
        }

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        Class<?> sourceType = value.getClass();
        if (GenericFile.class.isAssignableFrom(sourceType)) {
            GenericFile<?> genericFile = (GenericFile<?>) value;
            if (genericFile.getFile() != null) {
                Class<?> genericFileType = genericFile.getFile().getClass();
                TypeConverter converter = registry.lookup(Payload.class, genericFileType);
                if (converter != null) {
                    return (T) converter.convertTo(Payload.class, genericFile.getFile());
                }
            }
        }
        return null;
    }

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    public JcrProducer(JcrEndpoint jcrEndpoint) throws RepositoryException {
        super(jcrEndpoint);
    }


    public void process(Exchange exchange) throws Exception {
        TypeConverter converter = exchange.getContext().getTypeConverter();
        Session session = openSession();
        Message message = exchange.getIn();
        String operation = determineOperation(message);
        try {
            if (JcrConstants.JCR_INSERT.equals(operation)) {
                Node base = findOrCreateNode(session.getRootNode(), getJcrEndpoint().getBase());
                Node node = findOrCreateNode(base, getNodeName(message));
                Map<String, Object> headers = filterComponentHeaders(message.getHeaders());
                for (String key : headers.keySet()) {
                    Object header = message.getHeader(key);
                    if (header != null && Object[].class.isAssignableFrom(header.getClass())) {
                        Value[] value = converter.convertTo(Value[].class, exchange, header);
                        node.setProperty(key, value);
                    } else {
                        Value value = converter.convertTo(Value.class, exchange, header);
                        node.setProperty(key, value);
                    }
                }
                node.addMixin("mix:referenceable");
                exchange.getOut().setBody(node.getIdentifier());
                session.save();
            } else if (JcrConstants.JCR_GET_BY_ID.equals(operation)) {
                Node node = session.getNodeByIdentifier(exchange.getIn()
                        .getMandatoryBody(String.class));
                PropertyIterator properties = node.getProperties();
                while (properties.hasNext()) {
                    Property property = properties.nextProperty();
                    Class<?> aClass = classForJCRType(property);
                    Object value;
                    if (property.isMultiple()) {
                        value = converter.convertTo(aClass, exchange, property.getValues());
                    } else {
                        value = converter.convertTo(aClass, exchange, property.getValue());
                    }
                    message.setHeader(property.getName(), value);
                }
            } else {
                throw new RuntimeException("Unsupported operation: " + operation);

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            LOG.trace("Content-Length: {}", len);
        } else {
            response = new DefaultFullHttpResponse(HttpVersion.HTTP_1_1, HttpResponseStatus.valueOf(code));
        }
        
        TypeConverter tc = message.getExchange().getContext().getTypeConverter();


        // append headers
        // must use entrySet to ensure case of keys is preserved
        for (Map.Entry<String, Object> entry : message.getHeaders().entrySet()) {
            String key = entry.getKey();
            Object value = entry.getValue();
            // use an iterator as there can be multiple values. (must not use a delimiter)
            final Iterator<?> it = ObjectHelper.createIterator(value, null);
            while (it.hasNext()) {
                String headerValue = tc.convertTo(String.class, it.next());
                if (headerValue != null && headerFilterStrategy != null
                        && !headerFilterStrategy.applyFilterToCamelHeaders(key, headerValue, message.getExchange())) {
                    LOG.trace("HTTP-Header: {}={}", key, headerValue);
                    response.headers().add(key, headerValue);
                }

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        // update HTTP method accordingly as we know if we have a body or not
        HttpMethod method = NettyHttpHelper.createMethod(message, body != null);
        request.setMethod(method);
        
        TypeConverter tc = message.getExchange().getContext().getTypeConverter();


        // if we bridge endpoint then we need to skip matching headers with the HTTP_QUERY to avoid sending
        // duplicated headers to the receiver, so use this skipRequestHeaders as the list of headers to skip
        Map<String, Object> skipRequestHeaders = null;
        if (configuration.isBridgeEndpoint()) {
            String queryString = message.getHeader(Exchange.HTTP_QUERY, String.class);
            if (queryString != null) {
                skipRequestHeaders = URISupport.parseQuery(queryString);
            }
            // Need to remove the Host key as it should be not used
            message.getHeaders().remove("host");
        }


        // append headers
        // must use entrySet to ensure case of keys is preserved
        for (Map.Entry<String, Object> entry : message.getHeaders().entrySet()) {
            String key = entry.getKey();
            Object value = entry.getValue();


            // we should not add headers for the parameters in the uri if we bridge the endpoint
            // as then we would duplicate headers on both the endpoint uri, and in HTTP headers as well
            if (skipRequestHeaders != null && skipRequestHeaders.containsKey(key)) {
                continue;
            }


            // use an iterator as there can be multiple values. (must not use a delimiter)
            final Iterator<?> it = ObjectHelper.createIterator(value, null, true);
            while (it.hasNext()) {
                String headerValue = tc.convertTo(String.class, it.next());


                if (headerValue != null && headerFilterStrategy != null
                        && !headerFilterStrategy.applyFilterToCamelHeaders(key, headerValue, message.getExchange())) {
                    LOG.trace("HTTP-Header: {}={}", key, headerValue);
                    request.headers().add(key, headerValue);

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