Examples with HBaseMappingBuilder org.apache.gora.hbase.store.HBaseMapping.HBaseMappingBuilder used on opensource projects

Example 1 with HBaseMappingBuilder

use of org.apache.gora.hbase.store.HBaseMapping.HBaseMappingBuilder in project gora by apache.

the class HBaseStore method readMapping.

@SuppressWarnings("unchecked")
private HBaseMapping readMapping(String filename) throws IOException {
    HBaseMappingBuilder mappingBuilder = new HBaseMappingBuilder();
    try {
        SAXBuilder builder = new SAXBuilder();
        Document doc = builder.build(getClass().getClassLoader().getResourceAsStream(filename));
        Element root = doc.getRootElement();
        List<Element> tableElements = root.getChildren("table");
        for (Element tableElement : tableElements) {
            String tableName = tableElement.getAttributeValue("name");
            List<Element> fieldElements = tableElement.getChildren("family");
            for (Element fieldElement : fieldElements) {
                String familyName = fieldElement.getAttributeValue("name");
                String compression = fieldElement.getAttributeValue("compression");
                String blockCache = fieldElement.getAttributeValue("blockCache");
                String blockSize = fieldElement.getAttributeValue("blockSize");
                String bloomFilter = fieldElement.getAttributeValue("bloomFilter");
                String maxVersions = fieldElement.getAttributeValue("maxVersions");
                String timeToLive = fieldElement.getAttributeValue("timeToLive");
                String inMemory = fieldElement.getAttributeValue("inMemory");
                mappingBuilder.addFamilyProps(tableName, familyName, compression, blockCache, blockSize, bloomFilter, maxVersions, timeToLive, inMemory);
            }
        }
        List<Element> classElements = root.getChildren("class");
        boolean keyClassMatches = false;
        for (Element classElement : classElements) {
            if (classElement.getAttributeValue("keyClass").equals(keyClass.getCanonicalName()) && classElement.getAttributeValue("name").equals(persistentClass.getCanonicalName())) {
                LOG.debug("Keyclass and nameclass match.");
                keyClassMatches = true;
                String tableNameFromMapping = classElement.getAttributeValue("table");
                String tableName = getSchemaName(tableNameFromMapping, persistentClass);
                //tableNameFromMapping could be null here
                if (!tableName.equals(tableNameFromMapping)) {
                    //TODO this might not be the desired behavior as the user might have actually made a mistake.
                    LOG.warn("Mismatching schema's names. Mappingfile schema: '{}'. PersistentClass schema's name: '{}'. Assuming they are the same.", tableNameFromMapping, tableName);
                    if (tableNameFromMapping != null) {
                        mappingBuilder.renameTable(tableNameFromMapping, tableName);
                    }
                }
                mappingBuilder.setTableName(tableName);
                List<Element> fields = classElement.getChildren("field");
                for (Element field : fields) {
                    String fieldName = field.getAttributeValue("name");
                    String family = field.getAttributeValue("family");
                    String qualifier = field.getAttributeValue("qualifier");
                    mappingBuilder.addField(fieldName, family, qualifier);
                    mappingBuilder.addColumnFamily(tableName, family);
                }
                //do not continue on other class definitions
                break;
            }
        }
        if (!keyClassMatches)
            LOG.error("KeyClass in gora-hbase-mapping is not the same as the one in the databean.");
    } catch (MalformedURLException ex) {
        LOG.error("Error while trying to read the mapping file {}. " + "Expected to be in the classpath " + "(ClassLoader#getResource(java.lang.String)).", filename);
        LOG.error("Actual classpath = {}", Arrays.asList(((URLClassLoader) getClass().getClassLoader()).getURLs()));
        throw ex;
    } catch (IOException ex) {
        LOG.error(ex.getMessage(), ex);
        throw ex;
    } catch (Exception ex) {
        LOG.error(ex.getMessage(), ex);
        throw new IOException(ex);
    }
    return mappingBuilder.build();
}