private Optional generate()

in features/sharding/core/src/main/java/org/apache/shardingsphere/sharding/route/engine/condition/generator/impl/ConditionValueCompareOperatorGenerator.java [81:103]

• 23 lines of code
• 13 McCabe index (conditional complexity)

    private Optional<ShardingConditionValue> generate(final Comparable<?> comparable, final Column column, final String operator, final int parameterMarkerIndex) {
        String columnName = column.getName();
        String tableName = column.getTableName();
        List<Integer> parameterMarkerIndexes = parameterMarkerIndex > -1 ? Collections.singletonList(parameterMarkerIndex) : Collections.emptyList();
        switch (operator) {
            case EQUAL:
                return Optional.of(new ListShardingConditionValue<>(columnName, tableName, new ArrayList<>(Collections.singleton(comparable)), parameterMarkerIndexes));
            case GREATER_THAN:
                return null == comparable ? Optional.empty() : Optional.of(new RangeShardingConditionValue<>(columnName, tableName, Range.greaterThan(comparable), parameterMarkerIndexes));
            case LESS_THAN:
                return null == comparable ? Optional.empty() : Optional.of(new RangeShardingConditionValue<>(columnName, tableName, Range.lessThan(comparable), parameterMarkerIndexes));
            case AT_MOST:
                return null == comparable ? Optional.empty() : Optional.of(new RangeShardingConditionValue<>(columnName, tableName, Range.atMost(comparable), parameterMarkerIndexes));
            case AT_LEAST:
                return null == comparable ? Optional.empty() : Optional.of(new RangeShardingConditionValue<>(columnName, tableName, Range.atLeast(comparable), parameterMarkerIndexes));
            case IS:
                return "null".equalsIgnoreCase(String.valueOf(comparable))
                        ? Optional.of(new ListShardingConditionValue<>(columnName, tableName, new ArrayList<>(Collections.singleton(null)), parameterMarkerIndexes))
                        : Optional.empty();
            default:
                return Optional.empty();
        }
    }