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Available Transformation Functions
Note: d:swarm uses functions of the Metafacture framework for data transformation. You can find more detailed information about these functions at https://github.com/culturegraph/metafacture-core/wiki/Metamorph-functions.
Function | Description | Parameter | Explanation | Example |
---|---|---|---|---|
case | Letter characters are transformed to lower or upper case. | language | locale | en (for English) |
upper | lower case is converted to upper case | SLUB DRESDEN | ||
lower | upper case is converted to lower case | slub desden | ||
compose | Wraps the value in a prefix and postfix. Prefixing a mapping value “swarm” with “d:” will result in “d:swarm”. | prefix | prefix string | d: |
postfix | postfix string | |||
concat | Combines the values of several attributes into one element, adding option prefix and postfix strings, and passes result to output.
Value 1: “SLUB” Value 2: “Dresden” delimiter: “-” prefix: “Pre” postfix: “Post” Result: “PreSLUB-DresdenPost” |
delimiter | delimiter used to separate concatenated values | |
prefix | prefix string | |||
postfix | postfix string | |||
constant | Replaces the value with a constant string. | value | replace value | |
count | Counts occurrences of an attribute and passes result to output. | no parameter | ||
equals | Filtering based on equality of the inpupt attribute and the function parameter. If the same, the input attribute is passed to output. | string | comparison value |
Function | Description | Parameter | Explanation | Example |
---|---|---|---|---|
htmlanchor | Creates an HTML anchor tag with the following pattern (without "+" and spaces):
<a href=" + prefix + value + postfix + ">title</a> Example to be mapped: "slub-dresden" |
prefix | prefix string | http://www. |
postfix | postfix string | .de | ||
title | link text | Homepage SLUB Dresden | ||
isbn | ISBN cleaning, checkdigit verication and transformation between ISBN 10 and ISBN 13. Non-digit characters can be eliminated. ISBN can be validated. | isbn13 | transformation to ISBN 13 | |
isbn10 | transformation to ISBN 10 | |||
clean | elimination of non-digit characters | |||
verifyCheckDigit | validation | |||
normalize-utf8 | UTF-8 normalization. Transforms umlauts into canonical form. | no parameter | ||
not-equals | Filtering based on inequality. If unequal, attribute value is passed to putput. | string | comparison value |
Function | Description | Parameter | Explanation | Example |
---|---|---|---|---|
occurence | Filtering based on occurrence.
Values to be mapped (e.g. result of split): “SLUB” “Dresden” “d:swarm” “DMP” only: “moreThen 2″ sameEntity: “True” Result: “d:swarm” “DMP” |
only | Position of element | moreThen 2
3 lessThen |
sameEntity | True
False |
|||
regexp | Regexp matching returning the first occurrence of a pattern. The pattern is a Java regex pattern. | format | order of the capturing groups | ${1} |
match | regex pattern | ^isbn\d\d\-(\d{10,13}) | ||
replace | Replaces a pattern with a string. The pattern is a Java regex pattern. | pattern | regex pattern | ^isbn\d\d\-(\d{10,13}) |
with | replace value | |||
split | Splitting based on a regexp.
Value to be split: “SLUB-Dresden” delimiter: “-” Result: “SLUB” and “Dresden” are passed to output |
delimiter | regex pattern | |
substring | Extracts a substring.
value: “SLUB Dresden” start=0, end=7, returns “SLUB Dr” |
end | index position of the last character | |
start | index position of the first characte | |||
trim | Trims all white spaces at the beginning and at the end of the attribute value. | no parameter | ||
urlencode | Transforms all characters not allowed in a URL into URL-compatible characters. | no parameter | ||
regexlookup | Performs a table lookup where keys may be regexes. | lookupString | A map or uploaded file that contains key/value pairs. | |
default | Value used if no corresponding key is found. | |||
dewey | Dewey conversion and verification. | precision | A decimal number (represented in string format) showing the desired precision of the returned number; i.e. 100 to round to nearest hundred, 10 to round to nearest ten, 0.1 to round to nearest tenth, etc. | |
addLeadingZeros | Add leading zeros to a Dewey number (if not present). | |||
errorString | Error string that should be written as value, if the input string is not a valid Dewey number. | |||
http-api-request | HTTP API GET request with the input value as URI. Note: the URI should probably composed in a previous component, i.e., the http-api-request function expects a valid URI. Note: the response needs to be processed in a further component, e.g.,parse-json. | acceptType | The accept type of the HTTP API request. | |
errorString | Error string that should be written as value, if the HTTP API request fails for some reason. | |||
parse-json | Parses the input value with help of the given JSONPath. | jsonPath | The JSONPath to extract values from the given input JSON value. Note: the JSONPath must conform http://goessner.net/articles/JsonPath/. | |
errorString | Error string that should be written as value, if the JSON parsing fails for some reason. |
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