package ca.carleton.gcrc.couch.export.impl;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.apache.log4j.Logger;
import org.json.JSONArray;
import org.json.JSONObject;
import ca.carleton.gcrc.couch.app.Document;
import ca.carleton.gcrc.couch.app.impl.DocumentJSON;
import ca.carleton.gcrc.couch.client.CouchDb;
import ca.carleton.gcrc.couch.client.CouchDesignDocument;
import ca.carleton.gcrc.couch.client.CouchQuery;
import ca.carleton.gcrc.couch.client.CouchQueryResults;
import ca.carleton.gcrc.couch.export.SchemaCache;
import ca.carleton.gcrc.couch.export.SchemaExportInfo;
public class SchemaCacheCouchDb implements SchemaCache {
final protected Logger logger = Logger.getLogger(this.getClass());
// private CouchDb couchDb;
private CouchDesignDocument dd;
private Map<String,Document> documentsFromSchemaName = new HashMap<String,Document>();
private Map<String,SchemaExportInfo> exportInfoFromSchemaName = new HashMap<String,SchemaExportInfo>();
public SchemaCacheCouchDb(CouchDb couchDb) throws Exception {
// this.couchDb = couchDb;
this.dd = couchDb.getDesignDocument("atlas");
}
@Override
public Document getSchema(String schemaName) throws Exception {
if( documentsFromSchemaName.containsKey(schemaName) ) {
return documentsFromSchemaName.get(schemaName);
}
CouchQuery query = new CouchQuery();
query.setViewName("schemas");
query.setStartKey(schemaName);
query.setEndKey(schemaName);
query.setIncludeDocs(true);
CouchQueryResults results = dd.performQuery(query);
List<JSONObject> rows = results.getRows();
if( rows.size() < 1 ) {
documentsFromSchemaName.put(schemaName, null);
return null;
}
JSONObject row = rows.get(0);
JSONObject jsonDoc = row.optJSONObject("doc");
if( null == jsonDoc ) {
documentsFromSchemaName.put(schemaName, null);
return null;
}
Document doc = new DocumentJSON(jsonDoc);
documentsFromSchemaName.put(schemaName, doc);
return doc;
}
@Override
public SchemaExportInfo getExportInfo(String schemaName) throws Exception {
if( exportInfoFromSchemaName.containsKey(schemaName) ){
return exportInfoFromSchemaName.get(schemaName);
}
SchemaExportInfo exportInfo = null;
try {
Document doc = getSchema(schemaName);
if( null != doc ) {
JSONArray jsonExport = doc.getJSONObject().optJSONArray("export");
if( null != jsonExport ) {
exportInfo = SchemaExportInfo.parseJson(jsonExport);
}
}
} catch(Exception e) {
throw new Exception("Error parsing export field for schema: "+schemaName);
}
exportInfoFromSchemaName.put(schemaName,exportInfo);
return exportInfo;
}
}