Examples with DirectedRelationship org.neo4j.ogm.context.DirectedRelationship used on opensource projects

Example 1 with DirectedRelationship

use of org.neo4j.ogm.context.DirectedRelationship in project neo4j-ogm by neo4j.

the class EntityAccessManager method getRelationalReader.

/**
 * Returns a FieldInfo for a scalar type definition on a ClassInfo that is not a primitive graph property
 *
 * @param classInfo             A ClassInfo declaring the type definition
 * @param relationshipType      The name of the relationship in the graph
 * @param relationshipDirection The direction of the relationship in the graph
 * @return A FieldInfo or null if none exists
 */
public static FieldInfo getRelationalReader(ClassInfo classInfo, String relationshipType, Direction relationshipDirection) {
    final DirectedRelationship directedRelationship = new DirectedRelationship(relationshipType, relationshipDirection);
    final Map<DirectedRelationship, FieldInfo> relationshipFieldInfoMap = relationalReaderCache.computeIfAbsent(classInfo, key -> new ConcurrentHashMap<>());
    if (relationshipFieldInfoMap.containsKey(directedRelationship)) {
        return relationshipFieldInfoMap.get(directedRelationship);
    }
    while (classInfo != null) {
        // 1st, try to find a field explicitly annotated with the neo4j relationship type and direction
        FieldInfo fieldInfo = classInfo.relationshipField(relationshipType, relationshipDirection, STRICT_MODE);
        if (fieldInfo != null && !fieldInfo.getAnnotations().isEmpty()) {
            relationshipFieldInfoMap.put(directedRelationship, fieldInfo);
            return fieldInfo;
        }
        // If it's outgoing, then proceed to find other matches
        if (relationshipDirection != Direction.INCOMING) {
            // 3rd, try to find a field  annotated with the neo4j relationship type and direction, allowing for implied relationships
            fieldInfo = classInfo.relationshipField(relationshipType, relationshipDirection, INFERRED_MODE);
            if (fieldInfo != null && !fieldInfo.getAnnotations().isEmpty()) {
                relationshipFieldInfoMap.put(directedRelationship, fieldInfo);
                return fieldInfo;
            }
            // 4th, try to find a "XYZ" field name where XYZ is derived from the relationship type
            if (fieldInfo != null) {
                relationshipFieldInfoMap.put(directedRelationship, fieldInfo);
                return fieldInfo;
            }
        }
        classInfo = classInfo.directSuperclass();
    }
    return null;
}