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Structr is an open source framework based on the popular Neo4j graph database.
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/**
* Copyright (C) 2010-2016 Structr GmbH
*
* This file is part of Structr .
*
* Structr is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* Structr is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Structr. If not, see implements DeserializationStrategy {
private static final Logger logger = Logger.getLogger(TypeAndPropertySetDeserializationStrategy.class.getName());
protected Set identifyingPropertyKeys = null;
protected Set foreignPropertyKeys = null;
protected RelationProperty relationProperty = null;
protected boolean createIfNotExisting = false;
protected Class targetType = null;
//~--- constructors ---------------------------------------------------
public SchemaDeserializationStrategy(final boolean createIfNotExisting, final Class targetType, final Set identifyingPropertyKeys, final Set foreignPropertyKeys) {
this.createIfNotExisting = createIfNotExisting;
this.identifyingPropertyKeys = identifyingPropertyKeys;
this.foreignPropertyKeys = foreignPropertyKeys;
this.targetType = targetType;
}
@Override
public void setRelationProperty(final RelationProperty relationProperty) {
this.relationProperty = relationProperty;
}
@Override
public T deserialize(SecurityContext securityContext, Class type, S source, final Object context) throws FrameworkException {
if (source instanceof JsonInput) {
PropertyMap attributes = PropertyMap.inputTypeToJavaType(securityContext, type, ((JsonInput)source).getAttributes());
return deserialize(securityContext, type, attributes, context);
}
if (source instanceof Map) {
PropertyMap attributes = PropertyMap.inputTypeToJavaType(securityContext, type, (Map)source);
return deserialize(securityContext, type, attributes, context);
}
return null;
}
private T deserialize(final SecurityContext securityContext, final Class type, final PropertyMap attributes, final Object context) throws FrameworkException {
final App app = StructrApp.getInstance(securityContext);
if (attributes != null) {
Result result = Result.EMPTY_RESULT;
// remove attributes that do not belong to the target node
final PropertyMap foreignProperties = new PropertyMap();
for (final Iterator it = attributes.keySet().iterator(); it.hasNext();) {
final PropertyKey key = it.next();
if (foreignPropertyKeys.contains(key)) {
// move entry to foreign map and remove from attributes
foreignProperties.put(key, attributes.get(key));
it.remove();
}
}
// retrieve and remove source type name (needed for foreign properties)
final String sourceTypeName = (String)((Map)context).get("name");
// Check if properties contain the UUID attribute
if (attributes.containsKey(GraphObject.id)) {
result = new Result(app.getNodeById(attributes.get(GraphObject.id)), false);
} else {
boolean attributesComplete = true;
// Check if all property keys of the PropertySetNotion are present
for (PropertyKey key : identifyingPropertyKeys) {
attributesComplete &= attributes.containsKey(key);
}
if (attributesComplete) {
// collect only those key-value pairs that are needed to
// identify the correct schema node (do not use related
// attributes to search for nodes)
final PropertyMap identifyingKeyValues = new PropertyMap();
for (final PropertyKey key : identifyingPropertyKeys) {
identifyingKeyValues.put(key, attributes.get(key));
}
result = app.nodeQuery(type).and(identifyingKeyValues).getResult();
}
}
// test set notion attributes for relationship creation
Map notionPropertyMap = (Map)securityContext.getAttribute("notionProperties");
if (notionPropertyMap == null) {
notionPropertyMap = new HashMap<>();
securityContext.setAttribute("notionProperties", notionPropertyMap);
}
// just check for existance
String errorMessage = null;
final int size = result.size();
switch (size) {
case 0:
if (createIfNotExisting) {
// create node and return it
T newNode = app.create(type, attributes);
if (newNode != null) {
notionPropertyMap.put(getStorageKey(relationProperty, newNode, sourceTypeName), foreignProperties);
return newNode;
}
}
errorMessage = "No node found for the given properties and auto-creation not enabled";
break;
case 1:
final T typedResult = getTypedResult(result, type);
notionPropertyMap.put(getStorageKey(relationProperty, typedResult, sourceTypeName), foreignProperties);
// set properties on existing node (relationships)
for (final Entry entry : attributes.entrySet()) {
typedResult.setProperty(entry.getKey(), entry.getValue());
}
return typedResult;
default:
errorMessage = "Found " + size + " nodes for given type and properties, property set is ambiguous";
logger.log(Level.SEVERE, "Found {0} nodes for given type and properties, property set is ambiguous!\n"
+ "This is often due to wrong modeling, or you should consider creating a uniquness constraint for " + type.getName(), size);
break;
}
throw new FrameworkException(404, errorMessage, new PropertiesNotFoundToken(type.getSimpleName(), AbstractNode.base, attributes));
}
return null;
}
private T getTypedResult(Result result, Class type) throws FrameworkException {
GraphObject obj = result.get(0);
if (!type.isAssignableFrom(obj.getClass())) {
throw new FrameworkException(422, "Node type mismatch", new TypeToken(type.getSimpleName(), null, type.getSimpleName()));
}
return result.get(0);
}
private String getStorageKey(final RelationProperty relationProperty, final NodeInterface newNode, final String sourceTypeName) {
switch (relationProperty.getDirectionKey()) {
case "in":
return newNode.getName() + relationProperty.getRelation().name() + sourceTypeName;
case "out":
return sourceTypeName + relationProperty.getRelation().name() + newNode.getName();
}
return null;
}
}
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