public TextStructure build()

in x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/textstructure/structurefinder/TextStructure.java [676:826]
136 lines of code
45 McCabe index (conditional complexity)

        public TextStructure build() {

            if (numLinesAnalyzed <= 0) {
                throw new IllegalArgumentException("Number of lines analyzed must be positive.");
            }

            if (numMessagesAnalyzed <= 0) {
                throw new IllegalArgumentException("Number of messages analyzed must be positive.");
            }

            if (numMessagesAnalyzed > numLinesAnalyzed) {
                throw new IllegalArgumentException("Number of messages analyzed cannot be greater than number of lines analyzed.");
            }

            if (sampleStart == null || sampleStart.isEmpty()) {
                throw new IllegalArgumentException("Sample start must be specified.");
            }

            if (charset == null || charset.isEmpty()) {
                throw new IllegalArgumentException("A character set must be specified.");
            }

            if (charset.toUpperCase(Locale.ROOT).startsWith("UTF") == false && hasByteOrderMarker != null) {
                throw new IllegalArgumentException("A byte order marker is only possible for UTF character sets.");
            }

            switch (format) {
                case NDJSON:
                    if (shouldTrimFields != null) {
                        throw new IllegalArgumentException("Should trim fields may not be specified for [" + format + "] structures.");
                    }
                    // $FALL-THROUGH$
                case XML:
                    if (columnNames != null) {
                        throw new IllegalArgumentException("Column names may not be specified for [" + format + "] structures.");
                    }
                    if (hasHeaderRow != null) {
                        throw new IllegalArgumentException("Has header row may not be specified for [" + format + "] structures.");
                    }
                    if (delimiter != null) {
                        throw new IllegalArgumentException("Delimiter may not be specified for [" + format + "] structures.");
                    }
                    if (quote != null) {
                        throw new IllegalArgumentException("Quote may not be specified for [" + format + "] structures.");
                    }
                    if (grokPattern != null) {
                        throw new IllegalArgumentException("Grok pattern may not be specified for [" + format + "] structures.");
                    }
                    break;
                case DELIMITED:
                    if (columnNames == null || columnNames.isEmpty()) {
                        throw new IllegalArgumentException("Column names must be specified for [" + format + "] structures.");
                    }
                    if (hasHeaderRow == null) {
                        throw new IllegalArgumentException("Has header row must be specified for [" + format + "] structures.");
                    }
                    if (delimiter == null) {
                        throw new IllegalArgumentException("Delimiter must be specified for [" + format + "] structures.");
                    }
                    if (grokPattern != null) {
                        throw new IllegalArgumentException("Grok pattern may not be specified for [" + format + "] structures.");
                    }
                    break;
                case SEMI_STRUCTURED_TEXT:
                    if (columnNames != null) {
                        throw new IllegalArgumentException("Column names may not be specified for [" + format + "] structures.");
                    }
                    if (hasHeaderRow != null) {
                        throw new IllegalArgumentException("Has header row may not be specified for [" + format + "] structures.");
                    }
                    if (delimiter != null) {
                        throw new IllegalArgumentException("Delimiter may not be specified for [" + format + "] structures.");
                    }
                    if (quote != null) {
                        throw new IllegalArgumentException("Quote may not be specified for [" + format + "] structures.");
                    }
                    if (shouldTrimFields != null) {
                        throw new IllegalArgumentException("Should trim fields may not be specified for [" + format + "] structures.");
                    }
                    if (grokPattern == null || grokPattern.isEmpty()) {
                        throw new IllegalArgumentException("Grok pattern must be specified for [" + format + "] structures.");
                    }
                    if (ecsCompatibility != null
                        && ecsCompatibility.isEmpty() == false
                        && GrokBuiltinPatterns.isValidEcsCompatibilityMode(ecsCompatibility) == false) {
                        throw new IllegalArgumentException(
                            ECS_COMPATIBILITY.getPreferredName()
                                + "] must be one of ["
                                + String.join(", ", GrokBuiltinPatterns.ECS_COMPATIBILITY_MODES)
                                + "] if specified"
                        );
                    }
                    break;
                default:
                    throw new IllegalStateException("enum value [" + format + "] missing from switch.");
            }

            boolean isTimestampFieldSpecified = (timestampField != null);
            boolean isJodaTimestampFormatsSpecified = (jodaTimestampFormats != null && jodaTimestampFormats.isEmpty() == false);
            boolean isJavaTimestampFormatsSpecified = (javaTimestampFormats != null && javaTimestampFormats.isEmpty() == false);

            if (isTimestampFieldSpecified != isJodaTimestampFormatsSpecified) {
                throw new IllegalArgumentException(
                    "Timestamp field and Joda timestamp formats must both be specified or neither be specified."
                );
            }

            if (isTimestampFieldSpecified != isJavaTimestampFormatsSpecified) {
                throw new IllegalArgumentException(
                    "Timestamp field and Java timestamp formats must both be specified or neither be specified."
                );
            }

            if (needClientTimezone && isTimestampFieldSpecified == false) {
                throw new IllegalArgumentException("Client timezone cannot be needed if there is no timestamp field.");
            }

            if (mappings == null || mappings.isEmpty()) {
                throw new IllegalArgumentException("Mappings must be specified.");
            }

            if (explanation == null || explanation.isEmpty()) {
                throw new IllegalArgumentException("Explanation must be specified.");
            }

            return new TextStructure(
                numLinesAnalyzed,
                numMessagesAnalyzed,
                sampleStart,
                charset,
                hasByteOrderMarker,
                format,
                multilineStartPattern,
                excludeLinesPattern,
                columnNames,
                hasHeaderRow,
                delimiter,
                quote,
                shouldTrimFields,
                grokPattern,
                ecsCompatibility,
                timestampField,
                jodaTimestampFormats,
                javaTimestampFormats,
                needClientTimezone,
                mappings,
                ingestPipeline,
                fieldStats,
                explanation
            );
        }