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RESTHeart MongoDB - MongoDB plugin
/*-
* ========================LICENSE_START=================================
* restheart-mongodb
* %%
* Copyright (C) 2014 - 2024 SoftInstigate
* %%
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 Affero General Public License
* along with this program. If not, see }
*/
public class Relationship {
private static final Logger LOGGER = LoggerFactory.getLogger(Relationship.class);
/**
*
*/
public static final String RELATIONSHIPS_ELEMENT_NAME = "rels";
/**
*
*/
public static final String REL_ELEMENT_NAME = "rel";
/**
*
*/
public static final String TYPE_ELEMENT_NAME = "type";
/**
*
*/
public static final String ROLE_ELEMENT_NAME = "role";
/**
*
*/
public static final String TARGET_DB_ELEMENT_NAME = "target-db";
/**
*
*/
public static final String TARGET_COLLECTION_ELEMENT_NAME = "target-coll";
/**
*
*/
public static final String REF_ELEMENT_NAME = "ref-field";
/**
*
* @param collProps
* @return
* @throws InvalidMetadataException
*/
public static List getFromJson(BsonDocument collProps)
throws InvalidMetadataException {
if (collProps == null) {
return null;
}
ArrayList ret = new ArrayList<>();
BsonValue _rels = collProps.get(RELATIONSHIPS_ELEMENT_NAME);
if (_rels == null) {
return ret;
}
if (!_rels.isArray()) {
throw new InvalidMetadataException(
"element '"
+ RELATIONSHIPS_ELEMENT_NAME
+ "' is not an array list."
+ _rels);
}
BsonArray rels = _rels.asArray();
for (BsonValue _rel : rels.getValues()) {
if (!_rel.isDocument()) {
throw new InvalidMetadataException(
"element '"
+ RELATIONSHIPS_ELEMENT_NAME
+ "' is not valid."
+ _rel);
}
BsonDocument rel = _rel.asDocument();
ret.add(getRelFromJson(rel));
}
return ret;
}
private static Relationship getRelFromJson(BsonDocument content)
throws InvalidMetadataException {
BsonValue _rel = content.get(REL_ELEMENT_NAME);
BsonValue _type = content.get(TYPE_ELEMENT_NAME);
BsonValue _role = content.get(ROLE_ELEMENT_NAME);
BsonValue _targetDb = content.get(TARGET_DB_ELEMENT_NAME);
BsonValue _targetCollection = content.get(TARGET_COLLECTION_ELEMENT_NAME);
BsonValue _referenceField = content.get(REF_ELEMENT_NAME);
if (_rel == null || !_rel.isString()) {
throw new InvalidMetadataException(
(_rel == null ? "missing " : "invalid ")
+ REL_ELEMENT_NAME
+ " element.");
}
if (_type == null || !_type.isString()) {
throw new InvalidMetadataException(
(_type == null ? "missing " : "invalid ")
+ TYPE_ELEMENT_NAME
+ " element.");
}
if (_role == null || !_role.isString()) {
throw new InvalidMetadataException(
(_role == null ? "missing " : "invalid ")
+ ROLE_ELEMENT_NAME
+ " element.");
}
if (_targetDb != null && !_targetDb.isString()) {
throw new InvalidMetadataException(
"invalid "
+ TARGET_DB_ELEMENT_NAME
+ " field.");
}
if (_targetCollection == null || !_targetCollection.isString()) {
throw new InvalidMetadataException(
(_targetCollection == null ? "missing " : "invalid ")
+ TARGET_COLLECTION_ELEMENT_NAME
+ " element.");
}
if (_referenceField == null || !_referenceField.isString()) {
throw new InvalidMetadataException(
(_referenceField == null ? "missing " : "invalid ")
+ REF_ELEMENT_NAME
+ " element.");
}
String rel = _rel.asString().getValue();
String type = _type.asString().getValue();
String role = _role.asString().getValue();
String targetDb = _targetDb == null
? null
: _targetDb.asString().getValue();
String targetCollection = _targetCollection.asString().getValue();
String referenceField = _referenceField.asString().getValue();
return new Relationship(
rel,
type,
role,
targetDb,
targetCollection,
referenceField);
}
private final String rel;
private final TYPE type;
private final ROLE role;
private final String targetDb;
private final String targetCollection;
private final String referenceField;
/**
*
* @param rel
* @param type
* @param role
* @param targetDb
* @param targetCollection
* @param referenceField
*/
public Relationship(
String rel,
TYPE type,
ROLE role,
String targetDb,
String targetCollection,
String referenceField) {
this.rel = rel;
this.type = type;
this.role = role;
this.targetDb = targetDb;
this.targetCollection = targetCollection;
this.referenceField = referenceField;
}
/**
*
* @param rel
* @param type
* @param role
* @param targetDb
* @param targetCollection
* @param referenceField
* @throws InvalidMetadataException
*/
public Relationship(
String rel,
String type,
String role,
String targetDb,
String targetCollection,
String referenceField)
throws InvalidMetadataException {
this.rel = rel;
try {
this.type = TYPE.valueOf(type);
} catch (IllegalArgumentException iae) {
throw new InvalidMetadataException(
"invalid type value: "
+ type
+ ". valid values are "
+ Arrays.toString(TYPE.values()),
iae);
}
try {
this.role = ROLE.valueOf(role);
} catch (IllegalArgumentException iae) {
throw new InvalidMetadataException(
"invalid role value "
+ role
+ ". valid values are "
+ Arrays.toString(ROLE.values()),
iae);
}
this.targetDb = targetDb;
this.targetCollection = targetCollection;
this.referenceField = referenceField;
}
/**
*
* @param request
* @param dbName
* @param collName
* @param data
* @return
* @throws IllegalArgumentException
* @throws org.restheart.exchange.UnsupportedDocumentIdException
*/
public String getRelationshipLink(
MongoRequest request,
String dbName,
String collName,
BsonDocument data)
throws IllegalArgumentException, UnsupportedDocumentIdException {
BsonValue _referenceValue
= getReferenceFieldValue(referenceField, data);
String db = (targetDb == null ? dbName : targetDb);
// check _referenceValue
if (role == ROLE.OWNING) {
if (_referenceValue == null) {
return null; // the reference field is missing or it value is null => do not generate a link
}
if (type == TYPE.ONE_TO_ONE || type == TYPE.MANY_TO_ONE) {
BsonValue id = _referenceValue;
// can be an array if ref-field is a json path expression
if (id.isArray() && id.asArray().size() == 1) {
id = id.asArray().get(0);
}
return MongoURLUtils.getUriWithDocId(request, db, targetCollection, id);
} else {
if (!_referenceValue.isArray()) {
throw new IllegalArgumentException(
"in resource "
+ dbName
+ "/"
+ collName
+ "/"
+ data.get("_id")
+ " the "
+ type.name()
+ " relationship ref-field "
+ this.referenceField
+ " should be an array, but it is "
+ _referenceValue);
}
List bsonVals = _referenceValue.asArray().getValues();
BsonValue[] ids = bsonVals.toArray(new BsonValue[bsonVals.size()]);
return MongoURLUtils.getUriWithFilterMany(request, db, targetCollection, ids);
}
} else {
// INVERSE
BsonValue id = data.get("_id");
if (type == TYPE.ONE_TO_ONE || type == TYPE.ONE_TO_MANY) {
return MongoURLUtils.getUriWithFilterOne(
request,
db,
targetCollection,
referenceField,
id);
} else if (type == TYPE.MANY_TO_ONE || type == TYPE.MANY_TO_MANY) {
return MongoURLUtils.getUriWithFilterManyInverse(
request,
db,
targetCollection,
referenceField,
id);
}
}
LOGGER.debug("returned null link. this = {}, data = {}", this, data);
return null;
}
/**
*
* @returns the reference field value, either it is an object or, in case
* referenceField is a json path, a BsonDocument
*
*
*/
private BsonValue getReferenceFieldValue(
String referenceField,
BsonDocument data) {
if (referenceField.startsWith("$.")) {
// it is a json path expression
List> objs;
try {
objs = BsonUtils.getPropsFromPath(data, referenceField);
} catch (IllegalArgumentException ex) {
return null;
}
if (objs == null) {
return null;
}
BsonArray ret = new BsonArray();
objs.stream().forEach((Optional obj) -> {
if (obj != null && obj.isPresent()) {
ret.add(obj.get());
} else {
LOGGER.trace(
"the reference field {} resolved to {} from {}",
referenceField,
objs,
data);
}
});
if (ret.isEmpty()) {
return null;
} else {
return ret;
}
} else {
return data.get(referenceField);
}
}
/**
* @return the rel
*/
public String getRel() {
return rel;
}
/**
* @return the type
*/
public TYPE getType() {
return type;
}
/**
* @return the role
*/
public ROLE getRole() {
return role;
}
/**
* @return the targetDb
*/
public String getTargetDb() {
return targetDb;
}
/**
* @return the targetCollection
*/
public String getTargetCollection() {
return targetCollection;
}
/**
* @return the referenceField
*/
public String getReferenceField() {
return referenceField;
}
/**
*
*/
public enum TYPE {
/**
*
*/
ONE_TO_ONE,
/**
*
*/
ONE_TO_MANY,
/**
*
*/
MANY_TO_ONE,
/**
*
*/
MANY_TO_MANY
}
/**
*
*/
public enum ROLE {
/**
*
*/
OWNING,
/**
*
*/
INVERSE
}
}
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