Example usage for org.springframework.data.crossstore ChangeSet set

Introduction

In this page you can find the example usage for org.springframework.data.crossstore ChangeSet set.

Prototype

void set(String key, Object o);

Source Link

Usage

From source file:org.springframework.data.mongodb.crossstore.MongoChangeSetPersister.java

public void getPersistentState(Class<? extends ChangeSetBacked> entityClass, Object id,
        final ChangeSet changeSet) throws DataAccessException, NotFoundException {

    if (id == null) {
        log.debug("Unable to load MongoDB data for null id");
        return;/*from w  ww. ja va2  s. co m*/
    }

    String collName = getCollectionNameForEntity(entityClass);

    final DBObject dbk = new BasicDBObject();
    dbk.put(ENTITY_ID, id);
    dbk.put(ENTITY_CLASS, entityClass.getName());
    if (log.isDebugEnabled()) {
        log.debug("Loading MongoDB data for " + dbk);
    }
    mongoTemplate.execute(collName, new CollectionCallback<Object>() {
        public Object doInCollection(DBCollection collection) throws MongoException, DataAccessException {
            for (DBObject dbo : collection.find(dbk)) {
                String key = (String) dbo.get(ENTITY_FIELD_NAME);
                if (log.isDebugEnabled()) {
                    log.debug("Processing key: " + key);
                }
                if (!changeSet.getValues().containsKey(key)) {
                    String className = (String) dbo.get(ENTITY_FIELD_CLASS);
                    if (className == null) {
                        throw new DataIntegrityViolationException("Unble to convert property " + key
                                + ": Invalid metadata, " + ENTITY_FIELD_CLASS + " not available");
                    }
                    Class<?> clazz = ClassUtils.resolveClassName(className, ClassUtils.getDefaultClassLoader());
                    Object value = mongoTemplate.getConverter().read(clazz, dbo);
                    if (log.isDebugEnabled()) {
                        log.debug("Adding to ChangeSet: " + key);
                    }
                    changeSet.set(key, value);
                }
            }
            return null;
        }
    });
}

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