Package org.springframework.data.neo4j.fieldaccess

Source Code of org.springframework.data.neo4j.fieldaccess.OneToNRelationshipFieldAccessorFactory$OneToNRelationshipFieldAccessor

/**
* Copyright 2011 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*      http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

package org.springframework.data.neo4j.fieldaccess;

import static org.springframework.data.neo4j.support.DoReturn.doReturn;

import java.util.Collections;
import java.util.HashSet;
import java.util.Set;

import org.neo4j.graphdb.Direction;
import org.neo4j.graphdb.Node;
import org.neo4j.graphdb.RelationshipType;
import org.springframework.data.neo4j.core.NodeBacked;
import org.springframework.data.neo4j.mapping.Neo4JPersistentProperty;
import org.springframework.data.neo4j.mapping.RelationshipInfo;
import org.springframework.data.neo4j.support.GraphDatabaseContext;

public class OneToNRelationshipFieldAccessorFactory<T extends NodeBacked, TARGET extends NodeBacked> extends NodeRelationshipFieldAccessorFactory<T, TARGET> {
 
  public OneToNRelationshipFieldAccessorFactory(GraphDatabaseContext graphDatabaseContext) {
    super(graphDatabaseContext);
  }

    @Override
    public boolean accept(final Neo4JPersistentProperty property) {
        if (!property.isRelationship()) return false;
        final RelationshipInfo info = property.getRelationshipInfo();
        return info.isMultiple() && info.targetsNodes() && !info.isReadonly();
    }

    @Override
  public FieldAccessor<T> forField(final Neo4JPersistentProperty property) {
        final RelationshipInfo relationshipInfo = property.getRelationshipInfo();
        final Class<TARGET> targetType = (Class<TARGET>) relationshipInfo.getTargetType().getType();
        return new OneToNRelationshipFieldAccessor<T, TARGET>(relationshipInfo.getRelationshipType(), relationshipInfo.getDirection(), targetType, graphDatabaseContext,property);
  }

  public static class OneToNRelationshipFieldAccessor<T extends NodeBacked, TARGET extends NodeBacked> extends NodeToNodesRelationshipFieldAccessor<T, TARGET> {

      public OneToNRelationshipFieldAccessor(final RelationshipType type, final Direction direction, final Class<TARGET> elementClass, final GraphDatabaseContext graphDatabaseContext, Neo4JPersistentProperty property) {
          super(elementClass, graphDatabaseContext, direction, type,property);
      }

      @Override
    public Object setValue(final T entity, final Object newVal) {
          final Node node = checkUnderlyingNode(entity);
          if (newVal == null) {
              removeMissingRelationships(node, Collections.<Node>emptySet());
              return null;
          }
          final Set<Node> targetNodes = checkTargetIsSetOfNodebacked(newVal);
          removeMissingRelationships(node, targetNodes);
          createAddedRelationships(node, targetNodes);
          return createManagedSet(entity, (Set<TARGET>) newVal);
      }

      @Override
      public Object getValue(final T entity) {
          checkUnderlyingNode(entity);
          final Set<TARGET> result = createEntitySetFromRelationshipEndNodes(entity);
          return doReturn(createManagedSet(entity, result));
      }

      @Override
    public Object getDefaultImplementation() {
          return new HashSet<TARGET>();
    }
  }
}
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