Examples of com.facebook.presto.jdbc.internal.jackson.databind.JsonNode

Package com.facebook.presto.jdbc.internal.jackson.databind

Examples of com.facebook.presto.jdbc.internal.jackson.databind.JsonNode

com.facebook.presto.jdbc.internal.jackson.databind.JsonNode
Base class for all JSON nodes, which form the basis of JSON Tree Model that Jackson implements. One way to think of these nodes is to consider them similar to DOM nodes in XML DOM trees.
As a general design rule, most accessors ("getters") are included in this base class, to allow for traversing structure without type casts. Most mutators, however, need to be accessed through specific sub-classes (such as ObjectNode and ArrayNode). This seems sensible because proper type information is generally available when building or modifying trees, but less often when reading a tree (newly built from parsed JSON content).
Actual concrete sub-classes can be found from package {@link com.facebook.presto.jdbc.internal.jackson.databind.node}.

    }


    @Override
    public final JsonNode findPath(String fieldName)
    {
        JsonNode value = findValue(fieldName);
        if (value == null) {
            return MissingNode.getInstance();
        }
        return value;
    }

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            return currentNode().textValue();
        case VALUE_NUMBER_INT:
        case VALUE_NUMBER_FLOAT:
            return String.valueOf(currentNode().numberValue());
        case VALUE_EMBEDDED_OBJECT:
            JsonNode n = currentNode();
            if (n != null && n.isBinary()) {
                // this will convert it to base64
                return n.asText();
            }
        }


        return (_currToken == null) ? null : _currToken.asString();
    }

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    //public byte getByteValue() throws IOException, JsonParseException


    @Override
    public NumberType getNumberType() throws IOException, JsonParseException {
        JsonNode n = currentNumericNode();
        return (n == null) ? null : n.numberType();
    }

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    @Override
    public Object getEmbeddedObject()
    {
        if (!_closed) {
            JsonNode n = currentNode();
            if (n != null) {
                if (n.isPojo()) {
                    return ((POJONode) n).getPojo();
                }
                if (n.isBinary()) {
                    return ((BinaryNode) n).binaryValue();
                }
            }
        }
        return null;

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    @Override
    public byte[] getBinaryValue(Base64Variant b64variant)
        throws IOException, JsonParseException
    {
        // Multiple possibilities...
        JsonNode n = currentNode();
        if (n != null) { // binary node?
            byte[] data = n.binaryValue();
            // (or TextNode, which can also convert automatically!)
            if (data != null) {
                return data;
            }
            // Or maybe byte[] as POJO?
            if (n.isPojo()) {
                Object ob = ((POJONode) n).getPojo();
                if (ob instanceof byte[]) {
                    return (byte[]) ob;
                }
            }

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    }


    protected JsonNode currentNumericNode()
        throws JsonParseException
    {
        JsonNode n = currentNode();
        if (n == null || !n.isNumber()) {
            JsonToken t = (n == null) ? null : n.asToken();
            throw _constructError("Current token ("+t+") not numeric, can not use numeric value accessors");
        }
        return n;
    }

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    @Override
    public ReadablePeriod deserialize(JsonParser jsonParser, DeserializationContext ctxt)
        throws IOException
    {
        JsonNode treeNode = jsonParser.readValueAsTree();
        String periodType = treeNode.path("fieldType").path("name").asText();
        String periodName = treeNode.path("periodType").path("name").asText();
        // any "weird" numbers we should worry about?
        int periodValue = treeNode.path(periodType).asInt();
        if (periodName.equals( "Seconds" )) {
            return Seconds.seconds( periodValue );
        }
        if (periodName.equals( "Minutes" )) {
            return Minutes.minutes( periodValue );

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    public HostAndPort deserialize(JsonParser jp, DeserializationContext ctxt)
        throws IOException
    {
        JsonToken t = jp.getCurrentToken();
        if (t == JsonToken.START_OBJECT) { // old style
            JsonNode root = jp.readValueAsTree();
            String host = root.path("hostText").asText();
            JsonNode n = root.get("port");
            if (n == null) {
                return HostAndPort.fromString(host);
            }
            return HostAndPort.fromParts(host, n.asInt());
        }
        if (t == JsonToken.VALUE_STRING) {
            return HostAndPort.fromString(jp.getText().trim());
        }
        // could also support arrays?

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    // Override needed to support legacy JSON Schema generator
    @Override
    protected void _depositSchemaProperty(ObjectNode propertiesNode, JsonNode schemaNode)
    {
        JsonNode props = schemaNode.get("properties");
        if (props != null) {
            Iterator<Entry<String, JsonNode>> it = props.fields();
            while (it.hasNext()) {
                Entry<String,JsonNode> entry = it.next();
                String name = entry.getKey();
                if (_nameTransformer != null) {
                    name = _nameTransformer.transform(name);

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    @Override
    public JsonNode findValue(String fieldName)
    {
        for (JsonNode node : _children) {
            JsonNode value = node.findValue(fieldName);
            if (value != null) {
                return value;
            }
        }
        return null;

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