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com.mooltiverse.oss.nyx.template.Functions Maven / Gradle / Ivy
com.mooltiverse.oss.nyx:java:3.0.6 All the Nyx Java artifacts
package com.mooltiverse.oss.nyx.template;
import static com.mooltiverse.oss.nyx.log.Markers.TEMPLATE;
import java.io.FileReader;
import java.io.IOException;
import java.io.StringWriter;
import java.text.SimpleDateFormat;
import java.time.ZoneOffset;
import java.util.Date;
import java.util.Map;
import java.util.Objects;
import java.util.TimeZone;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import com.github.jknack.handlebars.HelperRegistry;
import com.github.jknack.handlebars.Helper;
import com.github.jknack.handlebars.Options;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* The class modelling functions to use in dynamic configurations.
*/
class Functions {
/**
* The private logger instance
*/
private static final Logger logger = LoggerFactory.getLogger(Functions.class);
/**
* Default constructor is private on purpose.
*/
private Functions() {
super();
}
/**
* Registers all the available functions as a helpers with their names for the given registry.
*
* @param registry the registry to register the helpers to
*/
public static void registerHelpers(HelperRegistry registry) {
registry.registerHelper(Lower.NAME, new Lower());
registry.registerHelper(Upper.NAME, new Upper());
registry.registerHelper(Trim.NAME, new Trim());
registry.registerHelper(First.NAME, new First());
registry.registerHelper(FirstLower.NAME, new FirstLower());
registry.registerHelper(FirstUpper.NAME, new FirstUpper());
registry.registerHelper(Last.NAME, new Last());
registry.registerHelper(LastLower.NAME, new LastLower());
registry.registerHelper(LastUpper.NAME, new LastUpper());
registry.registerHelper(Sanitize.NAME, new Sanitize());
registry.registerHelper(SanitizeLower.NAME, new SanitizeLower());
registry.registerHelper(SanitizeUpper.NAME, new SanitizeUpper());
registry.registerHelper(Short5.NAME, new Short5());
registry.registerHelper(Short6.NAME, new Short6());
registry.registerHelper(Short7.NAME, new Short7());
registry.registerHelper(TimestampISO8601.NAME, new TimestampISO8601());
registry.registerHelper(TimestampYYYYMMDDHHMMSS.NAME, new TimestampYYYYMMDDHHMMSS());
registry.registerHelper(EnvironmentUser.NAME, new EnvironmentUser());
registry.registerHelper(EnvironmentVariable.NAME, new EnvironmentVariable());
registry.registerHelper(FileContent.NAME, new FileContent());
registry.registerHelper(FileExists.NAME, new FileExists());
registry.registerHelper(Capture.NAME, new Capture());
registry.registerHelper(CutLeft.NAME, new CutLeft());
registry.registerHelper(CutRight.NAME, new CutRight());
registry.registerHelper(Replace.NAME, new Replace());
registry.registerHelper(TimeFormat.NAME, new TimeFormat());
}
/**
* This is the superclass for all template functions.
*
* In particular this class offers the {@link Helper} implementation as an adapter method
* used by Handlebars to invoke the actual business method of the function.
*/
static abstract class AbstractFunction implements Helper {
}
/**
* This class provides basic features for functions with options (parameters).
* This kind of function has a name (the function name), one input which is the text from the template,
* and one or more parameters.
*/
static abstract class AbstractParametricFunction extends AbstractFunction {
/**
* {@inheritDoc}
*/
@Override
public Object apply(Object context, Options options)
throws IOException {
// The docs are poorly documented by all examples show that options.fn(this)
// is the only way to have the block resolved
return (Objects.isNull(options) ? "" : apply(options.fn(this).toString(), options.hash));
}
/**
* This method must be implemented by subclasses and will return the function specific output,
* provided the input and options.
*
* @param input the function input
* @param options the function options
*
* @return the function output
*/
public abstract String apply(String input, Map options);
}
/**
* This class provides basic features for functions without options (parameters).
* This kind of function only has a name (the function name) and one input which is the text from the template.
*/
static abstract class AbstractSimpleFunction extends AbstractFunction {
/**
* {@inheritDoc}
*/
@Override
public Object apply(Object context, Options options)
throws IOException {
// The docs are poorly documented by all examples show that options.fn(this)
// is the only way to have the block resolved
return (Objects.isNull(options) ? "" : apply(options.fn(this).toString()));
}
/**
* This method must be implemented by subclasses and will return the function specific output,
* provided the input.
*
* @param input the function input
*
* @return the function output
*/
public abstract String apply(String input);
}
/**
* This function returns the lower case representation of the input string.
*/
public static class Lower extends AbstractSimpleFunction {
/**
* The name to use for this function.
*/
public static final String NAME = "lower";
/**
* This method returns the lower case representation of the input string.
*
* @param input the input string. If {@code null} an empty string is returned.
*
* @return the lower case representation of the input string.
*/
@Override
public String apply(String input) {
if (Objects.isNull(input))
return "";
return input.toLowerCase();
}
}
/**
* This function returns the trimmed case representation of the input string.
*/
public static class Trim extends AbstractSimpleFunction {
/**
* The name to use for this function.
*/
public static final String NAME = "trim";
/**
* This method returns the trimmed case representation of the input string.
*
* @param input the input string. If {@code null} an empty string is returned.
*
* @return the trimmed case representation of the input string.
*/
@Override
public String apply(String input) {
if (Objects.isNull(input))
return "";
return input.trim();
}
}
/**
* This function returns the upper case representation of the input string.
*/
public static class Upper extends AbstractSimpleFunction {
/**
* The name to use for this function.
*/
public static final String NAME = "upper";
/**
* This method returns the upper case representation of the input string.
*
* @param input the input string. If {@code null} an empty string is returned.
*
* @return the upper case representation of the input string.
*/
@Override
public String apply(String input) {
if (Objects.isNull(input))
return "";
return input.toUpperCase();
}
}
/**
* This function returns the input string with everything from the first occurrence of a character other
* than letters and positive digits discarded.
*/
public static class First extends AbstractSimpleFunction {
/**
* The name to use for this function.
*/
public static final String NAME = "first";
/**
* This method returns the input string with everything from the first occurrence of a character other
* than letters and positive digits discarded.
*
* @param input the input string. If {@code null} an empty string is returned.
*
* @return the input string with everything from the first occurrence of a character other
* than letters and positive digits discarded.
*/
@Override
public String apply(String input) {
if (Objects.isNull(input))
return "";
Matcher matcher = Pattern.compile("^([a-zA-Z0-9]*)").matcher(input);
return matcher.find() ? matcher.group() : "";
}
}
/**
* This function returns the input string with everything from the first occurrence of a character other
* than letters and positive digits discarded and the remainder transformed to lower case.
*/
public static class FirstLower extends AbstractSimpleFunction {
/**
* The name to use for this function.
*/
public static final String NAME = "firstLower";
/**
* This method returns the input string with everything other than letters and positive digits discarded
* and the remainder transformed to lower case.
*
* @param input the input string. If {@code null} an empty string is returned.
*
* @return the input string with everything other than letters and positive digits discarded
* and the remainder transformed to lower case.
*/
@Override
public String apply(String input) {
if (Objects.isNull(input))
return "";
return new Lower().apply((new First().apply(input)));
}
}
/**
* This function returns the input string with everything from the first occurrence of a character other
* than letters and positive digits discarded and the remainder transformed to upper case.
*/
public static class FirstUpper extends AbstractSimpleFunction {
/**
* The name to use for this function.
*/
public static final String NAME = "firstUpper";
/**
* This method returns the input string with everything other than letters and positive digits discarded
* and the remainder transformed to upper case.
*
* @param input the input string. If {@code null} an empty string is returned.
*
* @return the input string with everything other than letters and positive digits discarded
* and the remainder transformed to upper case.
*/
@Override
public String apply(String input) {
if (Objects.isNull(input))
return "";
return new Upper().apply((new First().apply(input)));
}
}
/**
* This function returns the last part of the input string that does not contains characters other than
* letters and positive digits.
*/
public static class Last extends AbstractSimpleFunction {
/**
* The name to use for this function.
*/
public static final String NAME = "last";
/**
* This method returns the last part of the input string that does not contains characters other than.
* letters and positive digits.
*
* @param input the input string. If {@code null} an empty string is returned.
*
* @return the last part of the input string that does not contains characters other than.
* letters and positive digits.
*/
@Override
public String apply(String input) {
if (Objects.isNull(input))
return "";
Matcher matcher = Pattern.compile("(^[a-zA-Z0-9]*)?([a-zA-Z0-9]*)$").matcher(input);
return matcher.find() ? matcher.group() : "";
}
}
/**
* This function returns the last part of the input string that does not contains characters other than
* letters and positive digits and the remainder transformed to lower case.
*/
public static class LastLower extends AbstractSimpleFunction {
/**
* The name to use for this function.
*/
public static final String NAME = "lastLower";
/**
* This method returns the last part of the input string that does not contains characters other than
* letters and positive digits and the remainder transformed to lower case.
*
* @param input the input string. If {@code null} an empty string is returned.
*
* @return the last part of the input string that does not contains characters other than
* letters and positive digits and the remainder transformed to lower case.
*/
@Override
public String apply(String input) {
if (Objects.isNull(input))
return "";
return new Lower().apply((new Last().apply(input)));
}
}
/**
* This function returns the last part of the input string that does not contains characters other than
* letters and positive digits and the remainder transformed to upper case.
*/
public static class LastUpper extends AbstractSimpleFunction {
/**
* The name to use for this function.
*/
public static final String NAME = "lastUpper";
/**
* This method returns the last part of the input string that does not contains characters other than
* letters and positive digits and the remainder transformed to upper case.
*
* @param input the input string. If {@code null} an empty string is returned.
*
* @return the last part of the input string that does not contains characters other than
* letters and positive digits and the remainder transformed to upper case.
*/
@Override
public String apply(String input) {
if (Objects.isNull(input))
return "";
return new Upper().apply((new Last().apply(input)));
}
}
/**
* This function returns the input string with everything other than letters and positive digits discarded.
*/
public static class Sanitize extends AbstractSimpleFunction {
/**
* The name to use for this function.
*/
public static final String NAME = "sanitize";
/**
* This method returns the input string with everything other than letters and positive digits discarded.
*
* @param input the input string. If {@code null} an empty string is returned.
*
* @return the input string with everything other than letters and positive digits discarded.
*/
@Override
public String apply(String input) {
if (Objects.isNull(input))
return "";
return input.replaceAll("[^a-zA-Z0-9]", "");
}
}
/**
* This function returns the input string with everything other than letters and positive digits discarded
* and the remainder transformed to lower case.
*/
public static class SanitizeLower extends AbstractSimpleFunction {
/**
* The name to use for this function.
*/
public static final String NAME = "sanitizeLower";
/**
* This method returns the input string with everything other than letters and positive digits discarded
* and the remainder transformed to lower case.
*
* @param input the input string. If {@code null} an empty string is returned.
*
* @return the input string with everything other than letters and positive digits discarded
* and the remainder transformed to lower case.
*/
@Override
public String apply(String input) {
if (Objects.isNull(input))
return "";
return new Lower().apply(new Sanitize().apply(input));
}
}
/**
* This function returns the input string with everything other than letters and positive digits discarded
* and the remainder transformed to upper case.
*/
public static class SanitizeUpper extends AbstractSimpleFunction {
/**
* The name to use for this function.
*/
public static final String NAME = "sanitizeUpper";
/**
* This method returns the input string with everything other than letters and positive digits discarded
* and the remainder transformed to upper case.
*
* @param input the input string. If {@code null} an empty string is returned.
*
* @return the input string with everything other than letters and positive digits discarded
* and the remainder transformed to upper case.
*/
@Override
public String apply(String input) {
if (Objects.isNull(input))
return "";
return new Upper().apply(new Sanitize().apply(input));
}
}
/**
* This function returns the first 5 characters of the input string, if it's longer than 5 characters,
* otherwise returns the input string.
*/
public static class Short5 extends AbstractSimpleFunction {
/**
* The name to use for this function.
*/
public static final String NAME = "short5";
/**
* This method returns the first 5 characters of the input string, if it's longer than 5 characters,
* otherwise returns the input string or the empty string if the input is {@code null}.
*
* @param input the input string. If {@code null} an empty string is returned.
*
* @return the first 5 characters of the input string, if it's longer than 5 characters,
* otherwise returns the input string.
*/
@Override
public String apply(String input) {
if (Objects.isNull(input))
return "";
return input.length() > 5 ? input.substring(0, 5) : input;
}
}
/**
* This function returns the first 6 characters of the input string, if it's longer than 6 characters,
* otherwise returns the input string.
*/
public static class Short6 extends AbstractSimpleFunction {
/**
* The name to use for this function.
*/
public static final String NAME = "short6";
/**
* This method returns the first 6 characters of the input string, if it's longer than 6 characters,
* otherwise returns the input string or the empty string if the input is {@code null}.
*
* @param input the input string. If {@code null} an empty string is returned.
*
* @return the first 6 characters of the input string, if it's longer than 6 characters,
* otherwise returns the input string.
*/
@Override
public String apply(String input) {
if (Objects.isNull(input))
return "";
return input.length() > 6 ? input.substring(0, 6) : input;
}
}
/**
* This function returns the first 7 characters of the input string, if it's longer than 7 characters,
* otherwise returns the input string.
*/
public static class Short7 extends AbstractSimpleFunction {
/**
* The name to use for this function.
*/
public static final String NAME = "short7";
/**
* This method returns the first 7 characters of the input string, if it's longer than 7 characters,
* otherwise returns the input string or the empty string if the input is {@code null}.
*
* @param input the input string. If {@code null} an empty string is returned.
*
* @return the first 7 characters of the input string, if it's longer than 7 characters,
* otherwise returns the input string.
*/
@Override
public String apply(String input) {
if (Objects.isNull(input))
return "";
return input.length() > 7 ? input.substring(0, 7) : input;
}
}
/**
* This function parses the input string as a {@link Long} representing a timestamp in the
* unix format and returns it formatted as
* ISO 8601 UTC timestamp.
*/
public static class TimestampISO8601 extends AbstractSimpleFunction {
/**
* The name to use for this function.
*/
public static final String NAME = "timestampISO8601";
/**
* This method parses the input string as a {@link Long} representing a timestamp in the
* unix format and returns it formatted as
* ISO 8601 UTC timestamp.
* If the input value fails to parse for whatever reason then the emty string is returned
* (and an error is logged).
*
* @param input the input string. If {@code null} an empty string is returned.
*
* @return the ISO 8601 representation of the input timestamp, or an empty string if parsing the input
* fails for any reson.
*/
@Override
public String apply(String input) {
if (Objects.isNull(input))
return "";
try {
Date date = new Date(Long.valueOf(input).longValue());
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss");
dateFormat.setTimeZone(TimeZone.getTimeZone(ZoneOffset.UTC));
return dateFormat.format(date);
}
catch (NumberFormatException nfe) {
logger.error(TEMPLATE, "String '{}' does not represent a valid Long timestamp", input);
return "";
}
}
}
/**
* This function parses the input string as a {@link Long} representing a timestamp in the
* unix format and returns it formatted as
* {@code YYYYMMDDHHMMSS} UTC.
*/
public static class TimestampYYYYMMDDHHMMSS extends AbstractSimpleFunction {
/**
* The name to use for this function.
*/
public static final String NAME = "timestampYYYYMMDDHHMMSS";
/**
* This method parses the input string as a {@link Long} representing a timestamp in the
* unix format and returns it formatted as
* {@code YYYYMMDDHHMMSS} UTC.
* If the input value fails to parse for whatever reason then the emty string is returned
* (and an error is logged).
*
* @param input the input string. If {@code null} an empty string is returned.
*
* @return the ISO 8601 representation of the input timestamp, or an empty string if parsing the input
* fails for any reson.
*/
@Override
public String apply(String input) {
if (Objects.isNull(input))
return "";
try {
Date date = new Date(Long.valueOf(input).longValue());
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyyMMddHHmmss");
dateFormat.setTimeZone(TimeZone.getTimeZone(ZoneOffset.UTC));
return dateFormat.format(date);
}
catch (NumberFormatException nfe) {
logger.error(TEMPLATE, "String '{}' does not represent a valid Long timestamp", input);
return "";
}
}
}
/**
* This function returns the value of the environment variable with the given name, if any.
*/
public static class EnvironmentVariable extends AbstractSimpleFunction {
/**
* The name to use for this function.
*/
public static final String NAME = "environmentVariable";
/**
* This method returns the value of the environment variable with the given name, if any.
*
* @param name the name of the requested variable. If {@code null} an empty string is returned.
*
* @return the value of the environment variable with the given name, if any.
*/
@Override
public String apply(String name) {
if (Objects.isNull(name))
return "";
String res = System.getenv(name);
return Objects.isNull(res) ? "" : res;
}
}
/**
* This function returns the current user name. The input parameter is ignored.
*/
public static class EnvironmentUser extends AbstractSimpleFunction {
/**
* The name to use for this function.
*/
public static final String NAME = "environmentUser";
/**
* This method returns the current user name.
*
* @param name ignored.
*
* @return the current user name.
*/
@Override
public String apply(String name) {
return System.getProperty("user.name");
}
}
/**
* This function returns the content of the given file, if any.
*/
public static class FileContent extends AbstractSimpleFunction {
/**
* The name to use for this function.
*/
public static final String NAME = "fileContent";
/**
* This method returns the content of the given file, if any.
*
* @param path the path of file to get the content from. When a relative path is used it's resolved
* against the system current directory (configured directories are ignored here).
*
* @return the content of the given file, if any.
*/
@Override
public String apply(String path) {
if (Objects.isNull(path))
return "";
try {
java.io.File f = new java.io.File(path);
logger.trace(TEMPLATE, "Trying to read contents from file '{}' ('{}')", path, f.getAbsolutePath());
FileReader reader = new FileReader(f);
StringWriter writer = new StringWriter();
reader.transferTo(writer);
reader.close();
writer.flush();
return writer.toString();
}
catch (IOException ioe) {
logger.error(TEMPLATE, "Unable to read from file '{}': '{}'", path, ioe.getMessage());
logger.trace(TEMPLATE, "Unable to read from file", ioe);
return "";
}
}
}
/**
* This function returns {@code true} if the file with the given name exists, {@code false} otherwise.
*/
public static class FileExists extends AbstractSimpleFunction {
/**
* The name to use for this function.
*/
public static final String NAME = "fileExists";
/**
* This method returns {@code true} if the file with the given name exists, {@code false} otherwise.
*
* @param path the path of file to check. When a relative path is used it's resolved against the system
* current directory (configured directories are ignored here).
*
* @return {@code true} if the file with the given name exists, {@code false} otherwise.
*/
@Override
public String apply(String path) {
if (Objects.isNull(path))
return Boolean.FALSE.toString();
java.io.File f = new java.io.File(path);
logger.trace(TEMPLATE, "Checking whether file '{}' ('{}') exists", path, f.getAbsolutePath());
return Boolean.toString(f.exists() && f.isFile());
}
}
/**
* This function uses a given regular expression to match the string input and uses the given (named) group
* value as a return value.
*/
public static class Capture extends AbstractParametricFunction {
/**
* The name to use for this function.
*/
public static final String NAME = "capture";
/**
* This method uses a given regular expression to match the string input and uses the given (named) group
* value as a return value. The {@code expression} option gives the regular expression to use, while the
* {@code group} option tells which group to return (if it's an integer it will be interpreded as a group index,
* otherwise a group name). Remember that group {@code 0} returns the whole string. If the regular expression
* doesn't even match the input string then an empty string is returned.
*
* @param input the function input
* @param options the function options, where the option named {@code expression} gives the regular expression to use,
* while the {@code group} option tells which group to return (if it's an integer it will be interpreded as a group index,
* otherwise a group name)
*
* @return the function output
*/
@Override
public String apply(String input, Map options) {
if (Objects.isNull(input))
return "";
if (options.containsKey("expression")) {
String expression = options.get("expression").toString();
Matcher m = Pattern.compile(expression).matcher(input);
m.find();
if (options.containsKey("group")) {
if (options.containsKey("group")) {
String groupName = options.get("group").toString();
try {
int groupIndex = Integer.parseUnsignedInt(groupName);
// The 'group' is an index
try {
return m.group(groupIndex);
}
catch (IllegalStateException ise) {
logger.debug(TEMPLATE, "The '{}' expression doesn't match '{}'", expression, input);
return "";
}
catch (IndexOutOfBoundsException ioobe) {
logger.debug(TEMPLATE, "The '{}' expression doesn't return any group with index '{}' from string '{}'", expression, groupIndex, input);
return "";
}
}
catch (NumberFormatException nfe) {
// The 'group' is a name
try {
return m.group(groupName);
}
catch (IllegalStateException ise) {
logger.debug(TEMPLATE, "The '{}' expression doesn't match '{}'", expression, input);
return "";
}
catch (IllegalArgumentException iae) {
logger.debug(TEMPLATE, "The '{}' expression doesn't return any group with name '{}' from string '{}'", expression, groupName, input);
return "";
}
}
}
else return input;
}
else return input;
}
else return input;
}
}
/**
* This function returns the last {@code N} characters of the input string, where {@code N} is the {@code length} option.
* If the input string is shorter or the same length than the parameter, the whole input string is returned unchanged.
* If the input is {@code null} an empty string is returned.
*/
public static class CutLeft extends AbstractParametricFunction {
/**
* The name to use for this function.
*/
public static final String NAME = "cutLeft";
/**
* This method returns the last {@code N} characters of the input string, where {@code N} is the {@code length} option.
* If the input string is shorter or the same length than the parameter, the whole input string is returned unchanged.
* If the input is {@code null} an empty string is returned.
*
* @param input the function input
* @param options the function options, where the option named {@code length} determines the maximum length of the
* returned string. If there is no such option the same string given as input is returned
*
* @return the function output
*/
@Override
public String apply(String input, Map options) {
if (Objects.isNull(input))
return "";
if (options.containsKey("length")) {
String optionString = options.get("length").toString();
int length = 0;
try {
length = Integer.valueOf(optionString).intValue();
}
catch (NumberFormatException nfe) {
logger.error(TEMPLATE, "The '{}' option value '{}' for the '{}' function is not a valid integer", "length", optionString, NAME);
return input;
}
if (length < 0) {
logger.error(TEMPLATE, "The '{}' option value '{}' for the '{}' function cannot be negative", "length", optionString, NAME);
return input;
}
return input.length() > length ? input.substring(input.length()-length, input.length()) : input;
}
else return input;
}
}
/**
* This function returns the first {@code N} characters of the input string, where {@code N} is the {@code length} option.
* If the input string is shorter or the same length than the parameter, the whole input string is returned unchanged.
* If the input is {@code null} an empty string is returned.
*/
public static class CutRight extends AbstractParametricFunction {
/**
* The name to use for this function.
*/
public static final String NAME = "cutRight";
/**
* This method returns the first {@code N} characters of the input string, where {@code N} is the {@code length} option.
* If the input string is shorter or the same length than the parameter, the whole input string is returned unchanged.
* If the input is {@code null} an empty string is returned.
*
* @param input the function input
* @param options the function options, where the option named {@code length} determines the maximum length of the
* returned string. If there is no such option the same string given as input is returned
*
* @return the function output
*/
@Override
public String apply(String input, Map options) {
if (Objects.isNull(input))
return "";
if (options.containsKey("length")) {
String optionString = options.get("length").toString();
int length = 0;
try {
length = Integer.valueOf(optionString).intValue();
}
catch (NumberFormatException nfe) {
logger.error(TEMPLATE, "The '{}' option value '{}' for the '{}' function is not a valid integer", "length", optionString, NAME);
return input;
}
if (length < 0) {
logger.error(TEMPLATE, "The '{}' option value '{}' for the '{}' function cannot be negative", "length", optionString, NAME);
return input;
}
return input.length() > length ? input.substring(0, length) : input;
}
else return input;
}
}
/**
* This function replaces the given character sequences from the input string with the given replacement.
*/
public static class Replace extends AbstractParametricFunction {
/**
* The name to use for this function.
*/
public static final String NAME = "replace";
/**
* This method replaces the given character sequences from the input string with the given replacement.
*
* @param input the function input
* @param options the function options, where the option named {@code from} determines the character sequence to be replaced,
* {@code to} determines the character sequence to be used for replacement
*
* @return the function output
*/
@Override
public String apply(String input, Map options) {
if (Objects.isNull(input))
return "";
if (options.containsKey("from")) {
String fromString = options.get("from").toString();
String toString = "";
if (options.containsKey("to")) {
toString = options.get("to").toString();
}
return input.replace(fromString, toString);
}
else return input;
}
}
/**
* This function returns a time value (expressed in milliseconds) and is also able to format it according to an optional
* format string.
*/
public static class TimeFormat extends AbstractParametricFunction {
/**
* The name to use for this function.
*/
public static final String NAME = "timeFormat";
/**
* This method returns returns a time value (expressed in milliseconds) and is also able to format it according to an optional
* format string.
*
* @param input the function input. This must be a long value representing a timestamp in milliseconds
* since January 1, 1970, 00:00:00 GMT. If this value is not provided, the system current timestamp is used.
* @param options the function options, where the option named {@code format} determines the string representation of the timestamp
*
* @return the function output
*/
@Override
public String apply(String input, Map options) {
long currentTime = System.currentTimeMillis();
if ((!Objects.isNull(input)) && !input.isBlank()) {
try {
currentTime = Long.valueOf(input).longValue();
}
catch (NumberFormatException nfe) {
logger.error(TEMPLATE, "The value '{}' for the '{}' function is not a valid long", input, NAME);
return "";
}
if (currentTime < 0) {
logger.error(TEMPLATE, "The value '{}' for the '{}' function cannot be negative", input, NAME);
return "";
}
}
if (options.containsKey("format")) {
String formatString = options.get("format").toString();
try {
Date date = new Date(Long.valueOf(currentTime).longValue());
SimpleDateFormat dateFormat = new SimpleDateFormat(formatString);
dateFormat.setTimeZone(TimeZone.getTimeZone(ZoneOffset.UTC));
return dateFormat.format(date);
}
catch (IllegalArgumentException iae) {
logger.error(TEMPLATE, "String '{}' does not represent a valid date format string", formatString);
return "";
}
}
else return Long.valueOf(currentTime).toString();
}
}
}
