Example usage for com.mongodb QueryOperators EXISTS

Introduction

In this page you can find the example usage for com.mongodb QueryOperators EXISTS.

Prototype

String EXISTS

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Usage

From source file:org.slc.sli.dal.convert.ContainerDocumentAccessor.java

License:Apache License

/**
 * Generate query criteria for the container-embedded doc (e.g. attendanceEvent) based on natural key fields
 * specified in schema for the 'embeddedDocType'.
 *
 * @param embeddedDocType// w w w  .java 2 s .c o m
 *        Container document type
 * @param doc
 *        Container-embedded document (e.g. single attendanceEvent)
 *
 * @return
 *        Query criteria for the container-embedded doc based on the natural key fields.
 */
private Map<String, Object> filterByNaturalKeys(String embeddedDocType, Map<String, Object> doc) {
    Map<String, Object> filteredDoc = new HashMap<String, Object>();
    List<Map<String, Object>> fieldCriteria = new ArrayList<Map<String, Object>>();

    // get natural key fields from schema
    NeutralSchema schema = schemaRepo.getSchema(embeddedDocType);

    // don't filter if the natural keys are unknown
    if (schema == null) {
        return doc;
    }

    // loop over natural key fields
    Map<String, NeutralSchema> fieldSchemas = schema.getFields();
    for (Map.Entry<String, NeutralSchema> fieldSchema : fieldSchemas.entrySet()) {
        AppInfo appInfo = (fieldSchema.getValue() == null) ? null : fieldSchema.getValue().getAppInfo();
        if (appInfo != null && appInfo.isNaturalKey()) {
            Map<String, Object> naturalKeyCriteria = new HashMap<String, Object>();
            if (doc.containsKey(fieldSchema.getKey())) {
                // add it to the update criteria
                naturalKeyCriteria.put(fieldSchema.getKey(), doc.get(fieldSchema.getKey()));
                fieldCriteria.add(naturalKeyCriteria);
            } else {
                Map<String, Object> nonExistCriteria = new HashMap<String, Object>();
                nonExistCriteria.put(QueryOperators.EXISTS, false);
                // explicitly exclude missing natural key fields
                naturalKeyCriteria.put(fieldSchema.getKey(), nonExistCriteria);
                fieldCriteria.add(naturalKeyCriteria);
            }
        }
    }

    filteredDoc.put(QueryOperators.AND, fieldCriteria);
    return filteredDoc;
}

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