Examples with LwM2mObject org.eclipse.leshan.core.node.LwM2mObject used on opensource projects

Example 21 with LwM2mObject

use of org.eclipse.leshan.core.node.LwM2mObject in project leshan by eclipse.

the class LwM2mNodeTlvDecoder method parseTlv.

@SuppressWarnings("unchecked")
private static <T extends LwM2mNode> T parseTlv(Tlv[] tlvs, LwM2mPath path, LwM2mModel model, Class<T> nodeClass) throws CodecException {
    LOG.trace("Parsing TLV content for path {}: {}", path, tlvs);
    // Object
    if (nodeClass == LwM2mObject.class) {
        List<LwM2mObjectInstance> instances = new ArrayList<>();
        // is it an array of TLV resources?
        if (// 
        tlvs.length > 0 && (tlvs[0].getType() == TlvType.MULTIPLE_RESOURCE || tlvs[0].getType() == TlvType.RESOURCE_VALUE)) {
            ObjectModel oModel = model.getObjectModel(path.getObjectId());
            if (oModel == null) {
                LOG.warn("No model for object {}. The tlv is decoded assuming this is a single instance object", path.getObjectId());
                instances.add(parseObjectInstanceTlv(tlvs, path.getObjectId(), 0, model));
            } else if (!oModel.multiple) {
                instances.add(parseObjectInstanceTlv(tlvs, path.getObjectId(), 0, model));
            } else {
                throw new CodecException("Object instance TLV is mandatory for multiple instances object [path:%s]", path);
            }
        } else {
            for (Tlv tlv : tlvs) {
                if (tlv.getType() != TlvType.OBJECT_INSTANCE)
                    throw new CodecException("Expected TLV of type OBJECT_INSTANCE but was %s  [path:%s]", tlv.getType().name(), path);
                instances.add(parseObjectInstanceTlv(tlv.getChildren(), path.getObjectId(), tlv.getIdentifier(), model));
            }
        }
        return (T) new LwM2mObject(path.getObjectId(), instances);
    } else // Object instance
    if (nodeClass == LwM2mObjectInstance.class) {
        if (tlvs.length == 1 && tlvs[0].getType() == TlvType.OBJECT_INSTANCE) {
            if (path.isObjectInstance() && tlvs[0].getIdentifier() != path.getObjectInstanceId()) {
                throw new CodecException("Id conflict between path [%s] and instance TLV [%d]", path, tlvs[0].getIdentifier());
            }
            // object instance TLV
            return (T) parseObjectInstanceTlv(tlvs[0].getChildren(), path.getObjectId(), tlvs[0].getIdentifier(), model);
        } else {
            // array of TLV resources
            // try to retrieve the instanceId from the path or the model
            Integer instanceId = path.getObjectInstanceId();
            if (instanceId == null) {
                // single instance object?
                ObjectModel oModel = model.getObjectModel(path.getObjectId());
                if (oModel != null && !oModel.multiple) {
                    instanceId = 0;
                } else {
                    instanceId = LwM2mObjectInstance.UNDEFINED;
                }
            }
            return (T) parseObjectInstanceTlv(tlvs, path.getObjectId(), instanceId, model);
        }
    } else // Resource
    if (nodeClass == LwM2mResource.class) {
        ResourceModel resourceModel = model.getResourceModel(path.getObjectId(), path.getResourceId());
        if (tlvs.length == 0 && resourceModel != null && !resourceModel.multiple) {
            // else we consider this is a multi-instance resource
            throw new CodecException("TLV payload is mandatory for single resource %s", path);
        } else if (tlvs.length == 1 && tlvs[0].getType() != TlvType.RESOURCE_INSTANCE) {
            if (path.isResource() && path.getResourceId() != tlvs[0].getIdentifier()) {
                throw new CodecException("Id conflict between path [%s] and resource TLV [%s]", path, tlvs[0].getIdentifier());
            }
            return (T) parseResourceTlv(tlvs[0], path.getObjectId(), path.getObjectInstanceId(), model);
        } else {
            Type expectedRscType = getResourceType(path, model);
            return (T) LwM2mMultipleResource.newResource(path.getResourceId(), parseTlvValues(tlvs, expectedRscType, path), expectedRscType);
        }
    } else {
        throw new IllegalArgumentException("invalid node class: " + nodeClass);
    }
}