Examples of org.lilyproject.util.repo.SystemFields$SystemField

org.lilyproject.util.repo.SystemFields
The idea behind SystemFields is to make system properties of records addressable as normal fields, that is, to make them addressable by a QName. This way, both fields and system properties are accessible through a uniform interface. This avoids the need to have two different addressing systems in situations that want to provide access to both.
The namespace for all system fields is org.lilyproject.system

At the time of this writing, SystemFields is used by the indexer and by conditional record updates.

It was not the intention to make the abstraction work the whole way, i.e. Record objects are not decorated to make the system fields appear, nor are they reported as 'changed fields' in the record events, etc. It seemed this could have all sorts of undesirable side-effects.
For each of the supported system fields, corresponding 'fake' FieldType objects are available. The UUIDs of these field type objects are name-based UUIDs, so they should never collide with those generated by Lily.
The FieldType objects returned by this class are not clones, so be careful not to modify them.

        // TODO should we check with the typemanager that the supplied value types are
        // of the correct type? this is not necessary for us, but might be helpful to the
        // user. OTOH, since users most of the time will go through a remote itf, such checks
        // will likely already have happened as part of serialization/deserialization code.


        SystemFields systemFields = SystemFields.getInstance(repository.getTypeManager(), repository.getIdGenerator());


        for (MutationCondition condition : conditions) {
            Object value = systemFields.softEval(record, condition.getField(), repository.getTypeManager());


            // Compare with null value is special case, handle this first
            if (condition.getValue() == null) {
                if (condition.getOp() == CompareOp.EQUAL) {
                    if (value == null) {

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            return null;
        }


        List<AvroMutationCondition> avroConditions = new ArrayList<AvroMutationCondition>(conditions.size());


        SystemFields systemFields = SystemFields.getInstance(repository.getTypeManager(), repository.getIdGenerator());


        IdentityRecordStack parentRecords = new IdentityRecordStack(parentRecord);


        for (MutationCondition condition : conditions) {
            FieldType fieldType;
            try {
                if (systemFields.isSystemField(condition.getField())) {
                    fieldType = systemFields.get(condition.getField());
                } else {
                    fieldType = repository.getTypeManager().getFieldTypeByName(condition.getField());
                }


                AvroMutationCondition avroCond = new AvroMutationCondition();

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        // Multiple repositories: ok to use public repo since only non-repository-specific things are needed
        LRepository repository = repositoryMgr.getDefaultRepository();


        List<MutationCondition> result = new ArrayList<MutationCondition>();
        SystemFields systemFields = SystemFields.getInstance(repository.getTypeManager(), repository.getIdGenerator());


        for (int i = 0; i < conditions.size(); i++) {
            JsonNode conditionNode = conditions.get(i);
            if (!conditionNode.isObject()) {
                throw new JsonFormatException("Each element in the conditions array should be an object.");
            }


            QName fieldName = QNameConverter.fromJson(JsonUtil.getString(conditionNode, "field"), namespaces);


            JsonNode valueNode = conditionNode.get("value");
            Object value = null;
            if (!valueNode.isNull()) {
                FieldType fieldType = systemFields.isSystemField(fieldName) ? systemFields.get(fieldName) :
                        repository.getTypeManager().getFieldTypeByName(fieldName);
                value = RecordReader.INSTANCE.readValue(
                        new RecordReader.ValueHandle(valueNode, "value", fieldType.getValueType()),
                        new RecordReader.ReadContext(repositoryMgr.getDefaultRepository(), namespaces,linkTransformer));
            }

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Related Classes of org.lilyproject.util.repo.SystemFields$SystemField

org.lilyproject.avro.AvroConverter

org.lilyproject.repository.api.FieldType

org.lilyproject.repository.api.QName

org.lilyproject.repository.api.RecordType

org.lilyproject.repository.api.SchemaId

org.lilyproject.repository.api.ValueType

org.lilyproject.repository.impl.MutationConditionVerifier

org.lilyproject.rest.providers.json.PostActionMessageBodyReader

java.util.UUID

org.lilyproject.repository.api.FieldTypeNotFoundException

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