Examples with ReadOperations org.neo4j.kernel.api.ReadOperations used on opensource projects

Example 36 with ReadOperations

use of org.neo4j.kernel.api.ReadOperations in project neo4j by neo4j.

the class BuiltInProcedures method listIndexes.

@Description("List all indexes in the database.")
@Procedure(name = "db.indexes", mode = READ)
public Stream<IndexResult> listIndexes() throws ProcedureException {
    try (Statement statement = tx.acquireStatement()) {
        ReadOperations operations = statement.readOperations();
        TokenNameLookup tokens = new StatementTokenNameLookup(operations);
        List<NewIndexDescriptor> indexes = asList(operations.indexesGetAll());
        Set<NewIndexDescriptor> uniqueIndexes = asSet(operations.uniqueIndexesGetAll());
        indexes.addAll(uniqueIndexes);
        indexes.sort(Comparator.comparing(a -> a.userDescription(tokens)));
        ArrayList<IndexResult> result = new ArrayList<>();
        for (NewIndexDescriptor index : indexes) {
            try {
                String type;
                if (uniqueIndexes.contains(index)) {
                    type = IndexType.NODE_UNIQUE_PROPERTY.typeName();
                } else {
                    type = IndexType.NODE_LABEL_PROPERTY.typeName();
                }
                result.add(new IndexResult("INDEX ON " + index.schema().userDescription(tokens), operations.indexGetState(index).toString(), type));
            } catch (IndexNotFoundKernelException e) {
                throw new ProcedureException(Status.Schema.IndexNotFound, e, "No index on ", index.userDescription(tokens));
            }
        }
        return result.stream();
    }
}

Example 37 with ReadOperations

use of org.neo4j.kernel.api.ReadOperations in project neo4j by neo4j.

the class SchemaProcedure method buildSchemaGraph.

public GraphResult buildSchemaGraph() {
    final Map<String, NodeImpl> nodes = new HashMap<>();
    final Map<String, Set<RelationshipImpl>> relationships = new HashMap<>();
    try (Statement statement = kernelTransaction.acquireStatement()) {
        ReadOperations readOperations = statement.readOperations();
        StatementTokenNameLookup statementTokenNameLookup = new StatementTokenNameLookup(readOperations);
        try (Transaction transaction = graphDatabaseAPI.beginTx()) {
            // add all labelsInDatabase
            ResourceIterator<Label> labelsInDatabase = graphDatabaseAPI.getAllLabelsInUse().iterator();
            while (labelsInDatabase.hasNext()) {
                Label label = labelsInDatabase.next();
                Map<String, Object> properties = new HashMap<>();
                Iterator<NewIndexDescriptor> indexDescriptorIterator = readOperations.indexesGetForLabel(readOperations.labelGetForName(label.name()));
                ArrayList<String> indexes = new ArrayList<>();
                while (indexDescriptorIterator.hasNext()) {
                    NewIndexDescriptor index = indexDescriptorIterator.next();
                    String[] propertyNames = PropertyNameUtils.getPropertyKeys(statementTokenNameLookup, index.schema().getPropertyIds());
                    indexes.add(String.join(",", propertyNames));
                }
                properties.put("indexes", indexes);
                Iterator<ConstraintDescriptor> nodePropertyConstraintIterator = readOperations.constraintsGetForLabel(readOperations.labelGetForName(label.name()));
                ArrayList<String> constraints = new ArrayList<>();
                while (nodePropertyConstraintIterator.hasNext()) {
                    PropertyConstraint constraint = ConstraintBoundary.map(nodePropertyConstraintIterator.next());
                    constraints.add(constraint.userDescription(statementTokenNameLookup));
                }
                properties.put("constraints", constraints);
                getOrCreateLabel(label.name(), properties, nodes);
            }
            //add all relationships
            Iterator<RelationshipType> relationshipTypeIterator = graphDatabaseAPI.getAllRelationshipTypesInUse().iterator();
            while (relationshipTypeIterator.hasNext()) {
                RelationshipType relationshipType = relationshipTypeIterator.next();
                String relationshipTypeGetName = relationshipType.name();
                int relId = readOperations.relationshipTypeGetForName(relationshipTypeGetName);
                ResourceIterator<Label> labelsInUse = graphDatabaseAPI.getAllLabelsInUse().iterator();
                List<NodeImpl> startNodes = new LinkedList<>();
                List<NodeImpl> endNodes = new LinkedList<>();
                while (labelsInUse.hasNext()) {
                    Label labelToken = labelsInUse.next();
                    String labelName = labelToken.name();
                    Map<String, Object> properties = new HashMap<>();
                    NodeImpl node = getOrCreateLabel(labelName, properties, nodes);
                    int labelId = readOperations.labelGetForName(labelName);
                    if (readOperations.countsForRelationship(labelId, relId, ReadOperations.ANY_LABEL) > 0) {
                        startNodes.add(node);
                    }
                    if (readOperations.countsForRelationship(ReadOperations.ANY_LABEL, relId, labelId) > 0) {
                        endNodes.add(node);
                    }
                }
                for (NodeImpl startNode : startNodes) {
                    for (NodeImpl endNode : endNodes) {
                        RelationshipImpl relationship = addRelationship(startNode, endNode, relationshipTypeGetName, relationships);
                    }
                }
            }
            transaction.success();
            return getGraphResult(nodes, relationships);
        }
    }
}

Example 38 with ReadOperations

use of org.neo4j.kernel.api.ReadOperations in project neo4j by neo4j.

the class GraphPropertiesProxy method getAllProperties.

@Override
public Map<String, Object> getAllProperties() {
    try (Statement statement = actions.statement()) {
        Map<String, Object> properties = new HashMap<>();
        ReadOperations readOperations = statement.readOperations();
        PrimitiveIntIterator propertyKeys = readOperations.graphGetPropertyKeys();
        while (propertyKeys.hasNext()) {
            int propertyKeyId = propertyKeys.next();
            properties.put(readOperations.propertyKeyGetName(propertyKeyId), readOperations.graphGetProperty(propertyKeyId));
        }
        return properties;
    } catch (PropertyKeyIdNotFoundKernelException e) {
        throw new IllegalStateException("Property key retrieved through kernel API should exist.", e);
    }
}

Example 39 with ReadOperations

use of org.neo4j.kernel.api.ReadOperations in project neo4j by neo4j.

the class NodeProxy method getDegree.

@Override
public int getDegree(RelationshipType type, Direction direction) {
    try (Statement statement = actions.statement()) {
        ReadOperations ops = statement.readOperations();
        int typeId = ops.relationshipTypeGetForName(type.name());
        if (typeId == NO_ID) {
            // This type doesn't even exist. Return 0
            return 0;
        }
        return ops.nodeGetDegree(nodeId, direction, typeId);
    } catch (EntityNotFoundException e) {
        throw new NotFoundException("Node not found.", e);
    }
}

Example 40 with ReadOperations

use of org.neo4j.kernel.api.ReadOperations in project neo4j by neo4j.

the class GraphPropertiesProxy method getProperties.

@Override
public Map<String, Object> getProperties(String... names) {
    try (Statement statement = actions.statement()) {
        Map<String, Object> properties = new HashMap<>();
        ReadOperations readOperations = statement.readOperations();
        for (String name : names) {
            int propertyKeyId = readOperations.propertyKeyGetForName(name);
            Object value = readOperations.graphGetProperty(propertyKeyId);
            if (value != null) {
                properties.put(name, value);
            }
        }
        return properties;
    }
}