public ConstraintDefinition _createConstrant(Label label, String key) {
Schema schema = graphDb.schema();
for (ConstraintDefinition constraint : schema.getConstraints(label))
for (String property : constraint.getPropertyKeys())
if (property.equals(key)) return constraint; // already existing
return schema.constraintFor(label).assertPropertyIsUnique(key).create();
}
/**
* Defines constraints for the graph property model. Creates indexes for blocks and transactions.
*/
protected void createIndexesAndUniqueConstraints() {
try (Transaction tx = graphDatabase.beginTx()) {
Schema schema = graphDatabase.schema();
if (!schema.getIndexes().iterator().hasNext()) {
LOGGER.debug("Creating Indexes and Unique Constraints.");
schema.constraintFor(LabelType.Block).assertPropertyIsUnique("hash").create();
schema.constraintFor(LabelType.Block).assertPropertyIsUnique("height").create();
// No unique constraints for transactions (see BIP30)
schema.indexFor(LabelType.Transaction).on("hash").create();
schema.constraintFor(LabelType.Address).assertPropertyIsUnique("hash").create();
schema.indexFor(LabelType.Coinbase).on("hash").create();
schema.indexFor(LabelType.LatestBlock).on("height").create();
}
tx.success();
}
}