public <T> T decodeProperty(String name, @Nullable String value, Class<T> type) {
requireNonNull(name, "name is null");
requireNonNull(type, "type is null");
SessionProperty<?> sessionProperty = allSessionProperties.get(name);
if (sessionProperty == null) {
throw new PrestoException(INVALID_SESSION_PROPERTY, "Unknown session property " + name);
}
PropertyMetadata<?> metadata = sessionProperty.getMetadata();
if (metadata.getJavaType() != type) {
throw new PrestoException(
INVALID_SESSION_PROPERTY,
format(
"Property %s is type %s, but requested type was %s",
name, metadata.getJavaType().getName(), type.getName()));
}
if (value == null) {
return type.cast(metadata.getDefaultValue());
}
Object objectValue = deserializeSessionProperty(metadata.getSqlType(), value);
try {
return type.cast(metadata.decode(objectValue));
} catch (PrestoException e) {
throw e;
} catch (Exception e) {
// the system property decoder can throw any exception
throw new PrestoException(
INVALID_SESSION_PROPERTY, format("%s is invalid: %s", name, value), e);
}
}
private static <T> T decodePropertyValue(
String fullPropertyName,
@Nullable String propertyValue,
Class<T> type,
PropertyMetadata<?> metadata) {
if (metadata.getJavaType() != type) {
throw new PrestoException(
INVALID_SESSION_PROPERTY,
format(
"Property %s is type %s, but requested type was %s",
fullPropertyName, metadata.getJavaType().getName(), type.getName()));
}
if (propertyValue == null) {
return type.cast(metadata.getDefaultValue());
}
Object objectValue = deserializeSessionProperty(metadata.getSqlType(), propertyValue);
try {
return type.cast(metadata.decode(objectValue));
} catch (PrestoException e) {
throw e;
} catch (Exception e) {
// the system property decoder can throw any exception
throw new PrestoException(
INVALID_SESSION_PROPERTY,
format("%s is invalid: %s", fullPropertyName, propertyValue),
e);
}
}