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Update entity linking support to derive document pointer from lookup …
…query. Simplify usage by computing the pointer from the lookup. Update the reference documentation, add JavaDoc and refine API. Original pull request: #3647. Closes #3602.
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...b/src/main/java/org/springframework/data/mongodb/core/convert/DocumentPointerFactory.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,135 @@ | ||
| /* | ||
| * Copyright 2021 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 | ||
| * | ||
| * https://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.mongodb.core.convert; | ||
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| import java.util.HashMap; | ||
| import java.util.LinkedHashMap; | ||
| import java.util.Map; | ||
| import java.util.Map.Entry; | ||
| import java.util.regex.Matcher; | ||
| import java.util.regex.Pattern; | ||
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|
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| import org.bson.Document; | ||
| import org.springframework.core.convert.ConversionService; | ||
| import org.springframework.data.mapping.PersistentPropertyAccessor; | ||
| import org.springframework.data.mapping.context.MappingContext; | ||
| import org.springframework.data.mapping.model.BeanWrapperPropertyAccessorFactory; | ||
| import org.springframework.data.mongodb.core.mapping.DocumentPointer; | ||
| import org.springframework.data.mongodb.core.mapping.MongoPersistentEntity; | ||
| import org.springframework.data.mongodb.core.mapping.MongoPersistentProperty; | ||
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|
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| /** | ||
| * @author Christoph Strobl | ||
| * @since 3.3 | ||
| */ | ||
| class DocumentPointerFactory { | ||
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| private ConversionService conversionService; | ||
| private MappingContext<? extends MongoPersistentEntity<?>, MongoPersistentProperty> mappingContext; | ||
| private Map<String, LinkageDocument> linkageMap; | ||
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| public DocumentPointerFactory(ConversionService conversionService, | ||
| MappingContext<? extends MongoPersistentEntity<?>, MongoPersistentProperty> mappingContext) { | ||
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| this.conversionService = conversionService; | ||
| this.mappingContext = mappingContext; | ||
| this.linkageMap = new HashMap<>(); | ||
| } | ||
|
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| public DocumentPointer<?> computePointer(MongoPersistentProperty property, Object value, Class<?> typeHint) { | ||
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| if (value instanceof LazyLoadingProxy) { | ||
| return () -> ((LazyLoadingProxy) value).getSource(); | ||
| } | ||
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| if (conversionService.canConvert(typeHint, DocumentPointer.class)) { | ||
| return conversionService.convert(value, DocumentPointer.class); | ||
| } else { | ||
|
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| MongoPersistentEntity<?> persistentEntity = mappingContext | ||
| .getPersistentEntity(property.getAssociationTargetType()); | ||
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| if (!property.getDocumentReference().lookup().toLowerCase().replaceAll("\\s", "").replaceAll("'", "") | ||
| .equals("{_id:?#{#target}}")) { | ||
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| return () -> linkageMap.computeIfAbsent(property.getDocumentReference().lookup(), key -> { | ||
| return new LinkageDocument(key); | ||
| }).get(persistentEntity, | ||
| BeanWrapperPropertyAccessorFactory.INSTANCE.getPropertyAccessor(property.getOwner(), value)); | ||
| } | ||
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| // just take the id as a reference | ||
| return () -> persistentEntity.getIdentifierAccessor(value).getIdentifier(); | ||
| } | ||
| } | ||
|
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| static class LinkageDocument { | ||
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| String lookup; | ||
| org.bson.Document fetchDocument; | ||
| Map<Integer, String> mapMap; | ||
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| public LinkageDocument(String lookup) { | ||
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| this.lookup = lookup; | ||
| String targetLookup = lookup; | ||
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| Pattern pattern = Pattern.compile("\\?#\\{#?[\\w\\d]*\\}"); | ||
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| Matcher matcher = pattern.matcher(lookup); | ||
| int index = 0; | ||
| mapMap = new LinkedHashMap<>(); | ||
| while (matcher.find()) { | ||
|
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| String expr = matcher.group(); | ||
| mapMap.put(Integer.valueOf(index), expr.substring(0, expr.length() - 1).replace("?#{#", "").replace("?#{", "") | ||
| .replace("target.", "").replaceAll("'", "")); | ||
| targetLookup = targetLookup.replace(expr, index + ""); | ||
| index++; | ||
| } | ||
|
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| fetchDocument = org.bson.Document.parse(targetLookup); | ||
| } | ||
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| org.bson.Document get(MongoPersistentEntity<?> persistentEntity, PersistentPropertyAccessor<?> propertyAccessor) { | ||
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| org.bson.Document targetDocument = new Document(); | ||
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| // TODO: recursive matching over nested Documents or would the parameter binding json parser be a thing? | ||
| // like we have it ordered by index values and could provide the parameter array from it. | ||
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| for (Entry<String, Object> entry : fetchDocument.entrySet()) { | ||
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| if (entry.getKey().equals("target")) { | ||
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| String refKey = mapMap.get(entry.getValue()); | ||
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| if (persistentEntity.hasIdProperty()) { | ||
| targetDocument.put(refKey, propertyAccessor.getProperty(persistentEntity.getIdProperty())); | ||
| } else { | ||
| targetDocument.put(refKey, propertyAccessor.getBean()); | ||
| } | ||
| continue; | ||
| } | ||
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| Object target = propertyAccessor.getProperty(persistentEntity.getPersistentProperty(entry.getKey())); | ||
| String refKey = mapMap.get(entry.getValue()); | ||
| targetDocument.put(refKey, target); | ||
| } | ||
| return targetDocument; | ||
| } | ||
| } | ||
| } |
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