Examples with RecordFormat io.cdap.cdap.api.data.format.RecordFormat used on opensource projects

Example 1 with RecordFormat

use of io.cdap.cdap.api.data.format.RecordFormat in project cdap by caskdata.

the class RecordFormats method createInitializedFormat.

/**
 * Create an initialized record format for the given format specification. The name in the specification is
 * first checked against standard names like "CSV" or "TSV". If it is a standard name, the corresponding
 * format will be created, with specification settings applied on top of default settings.
 * For example, "CSV" will map to the {@link DelimitedStringsRecordFormat}, with a comma as the delimiter,
 * whereas "TSV" will map to the {@link DelimitedStringsRecordFormat}, with a tab as the delimiter.
 * If the name is not a standard name, it is interpreted as a class name.
 *
 * @param spec the specification for the format to create and initialize
 * @param <FROM> Type of underlying object the format reads
 * @param <TO> Type of object the format reads the underlying object into
 * @return Initialized {@link RecordFormat} based on the given name
 * @throws IllegalAccessException if there was an illegal access when instantiating the record format
 * @throws InstantiationException if there was an exception instantiating the record format
 * @throws ClassNotFoundException if the record format class could not be found
 * @throws UnsupportedTypeException if the specification is not supported by the format
 */
public static <FROM, TO> RecordFormat<FROM, TO> createInitializedFormat(FormatSpecification spec) throws IllegalAccessException, InstantiationException, ClassNotFoundException, UnsupportedTypeException {
    String name = spec.getName();
    // check if it's a standard class
    Class<? extends RecordFormat> formatClass = NAME_CLASS_MAP.get(name.toLowerCase());
    @SuppressWarnings("unchecked") RecordFormat<FROM, TO> format = (RecordFormat<FROM, TO>) (formatClass == null ? Class.forName(name).newInstance() : formatClass.newInstance());
    // compute actual settings: use default settings if present
    Map<String, String> settings;
    Map<String, String> defaultSettings = NAME_SETTINGS_MAP.get(name.toLowerCase());
    if (defaultSettings != null) {
        settings = Maps.newHashMap(defaultSettings);
        if (spec.getSettings() != null) {
            settings.putAll(spec.getSettings());
        }
    } else {
        settings = spec.getSettings();
    }
    // compute actual schema
    Schema schema;
    Schema defaultSchema = DEFAULT_SCHEMA_MAP.get(name.toLowerCase());
    if (defaultSchema != null && spec.getSchema() == null) {
        schema = defaultSchema;
    } else {
        schema = spec.getSchema();
    }
    FormatSpecification actualSpec = new FormatSpecification(name, schema, settings);
    format.initialize(actualSpec);
    return format;
}