Examples with IllegalTypeConversionException org.apache.nifi.serialization.record.util.IllegalTypeConversionException used on opensource projects

Example 6 with IllegalTypeConversionException

use of org.apache.nifi.serialization.record.util.IllegalTypeConversionException in project nifi by apache.

the class JsonPathRowRecordReader method convert.

@SuppressWarnings("unchecked")
protected Object convert(final Object value, final DataType dataType, final String fieldName, final Object defaultValue) {
    if (value == null) {
        return defaultValue;
    }
    if (value instanceof List) {
        if (dataType.getFieldType() != RecordFieldType.ARRAY) {
            throw new IllegalTypeConversionException("Cannot convert value [" + value + "] of type Array to " + dataType);
        }
        final ArrayDataType arrayType = (ArrayDataType) dataType;
        final List<?> list = (List<?>) value;
        final Object[] coercedValues = new Object[list.size()];
        int i = 0;
        for (final Object rawValue : list) {
            coercedValues[i++] = convert(rawValue, arrayType.getElementType(), fieldName, null);
        }
        return coercedValues;
    }
    if (dataType.getFieldType() == RecordFieldType.RECORD && value instanceof Map) {
        final RecordDataType recordDataType = (RecordDataType) dataType;
        final RecordSchema childSchema = recordDataType.getChildSchema();
        final Map<String, Object> rawValues = (Map<String, Object>) value;
        final Map<String, Object> coercedValues = new HashMap<>();
        for (final Map.Entry<String, Object> entry : rawValues.entrySet()) {
            final String key = entry.getKey();
            final Optional<DataType> desiredTypeOption = childSchema.getDataType(key);
            if (desiredTypeOption.isPresent()) {
                final Optional<RecordField> field = childSchema.getField(key);
                final Object defaultFieldValue = field.isPresent() ? field.get().getDefaultValue() : null;
                final Object coercedValue = convert(entry.getValue(), desiredTypeOption.get(), fieldName + "." + key, defaultFieldValue);
                coercedValues.put(key, coercedValue);
            }
        }
        return new MapRecord(childSchema, coercedValues);
    } else {
        return DataTypeUtils.convertType(value, dataType, LAZY_DATE_FORMAT, LAZY_TIME_FORMAT, LAZY_TIMESTAMP_FORMAT, fieldName);
    }
}