org.opencastproject.util.data.functions

Class Strings

java.lang.Object

org.opencastproject.util.data.functions.Strings

public final class Strings
extends Object

Functions for strings.

Field Summary

Fields

Modifier and Type	Field and Description
static Function<String,String[]>	csvSplit Split function to split comma separated values.
static Function<String,List<String>>	csvSplitList Split function to split comma separated values.
static Function<String,String>	lowerCase A function to convert all of the characters in this String to lower case using the rules of the default locale.
static Predicate<String>	notBlank
static Function<String,Boolean>	toBool Convert a string into a boolean.
static Function<String,Option<Double>>	toDouble Convert a string into a long if possible.
static Function<String,Option<Integer>>	toInt Convert a string into an integer if possible.
static Function<String,List<Integer>>	toIntL Convert a string into an integer if possible.
static Function<String,Option<Long>>	toLong Convert a string into a long if possible.
static Function<String,List<String>>	trimToNil
static Function<String,Option<String>>	trimToNone Trim a string and return either some or none if it's empty.

Method Summary

Modifier and Type	Method and Description
static Function<String,String>	append(String suffix) A function to append a suffix to the argument string.
static <A> Function<A,Option<String>>	asString() Return a.toString() wrapped in a some if a != null, none otherwise.
static Option<String>	asString(Object a) Return a.toString() wrapped in a some if a != null, none otherwise.
static <A> Function<A,String>	asStringNull() Return a.toString() or <null> if argument is null.
static Function2<String,String,String>	concat(String sep) Return a string concatenation function.
static Predicate<String>	contains(String seq) A predicate function to check if a string contains a specified sequence.
static Predicate<String>	eqIgnoreCase(String other)
static <A> Function2<String,A[],String>	format() Return a string formatting function.
static <A> Function<A,String>	format(Format f)
static Predicate<String>	matches(String pattern) A predicate function to match a regular expression.
static Function<String,String>	prepend(String prefix) A function to prepend the argument string with a prefix.
static Function<String,String>	replaceAll(String regex, String replacement) Return a function that replaces all occurrences of regex in the argument with replacement .
static Function<String,String[]>	split(Pattern splitter) Create a split function from a regex pattern.
static Option<String>	trimToNone(String a) Trim a string and return either some or none if it's empty.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

trimToNone

public static final Function<String,Option<String>> trimToNone

Trim a string and return either some or none if it's empty. The string may be null.

toLong

public static final Function<String,Option<Long>> toLong

Convert a string into a long if possible.

toDouble

public static final Function<String,Option<Double>> toDouble

Convert a string into a long if possible.

toInt

public static final Function<String,Option<Integer>> toInt

Convert a string into an integer if possible.

toIntL

public static final Function<String,List<Integer>> toIntL

Convert a string into an integer if possible.

toBool

public static final Function<String,Boolean> toBool

Convert a string into a boolean.

See Also:

Boolean.valueOf(String)

notBlank

public static final Predicate<String> notBlank

trimToNil

public static final Function<String,List<String>> trimToNil

csvSplit

public static final Function<String,String[]> csvSplit

Split function to split comma separated values. Regex = \s*,\s*.

csvSplitList

public static final Function<String,List<String>> csvSplitList

Split function to split comma separated values. Regex = \s*,\s*.

lowerCase

public static final Function<String,String> lowerCase

A function to convert all of the characters in this String to lower case using the rules of the default locale.

Method Detail

trimToNone

public static Option<String> trimToNone(String a)

Trim a string and return either some or none if it's empty. The string may be null.

asString

public static Option<String> asString(Object a)

Return a.toString() wrapped in a some if a != null, none otherwise.

asString

public static <A> Function<A,Option<String>> asString()

Return a.toString() wrapped in a some if a != null, none otherwise.

asStringNull

public static <A> Function<A,String> asStringNull()

Return a.toString() or <null> if argument is null.

format

public static <A> Function2<String,A[],String> format()

Return a string formatting function.

See Also:

String.format(String, Object...)

format

public static <A> Function<A,String> format(Format f)

eqIgnoreCase

public static Predicate<String> eqIgnoreCase(String other)

replaceAll

public static Function<String,String> replaceAll(String regex,
                                                 String replacement)

Return a function that replaces all occurrences of regex in the argument with replacement .

See Also:

String.replaceAll(String, String)

split

public static Function<String,String[]> split(Pattern splitter)

Create a split function from a regex pattern.

prepend

public static Function<String,String> prepend(String prefix)

A function to prepend the argument string with a prefix.

append

public static Function<String,String> append(String suffix)

A function to append a suffix to the argument string.

matches

public static Predicate<String> matches(String pattern)

A predicate function to match a regular expression.

contains

public static Predicate<String> contains(String seq)

A predicate function to check if a string contains a specified sequence.

concat

public static Function2<String,String,String> concat(String sep)

Return a string concatenation function.