Mercurial > hg > Members > tatsuki > functionaljava-master > core
view src/main/java/fj/function/Strings.java @ 0:fe80c1edf1be
add getLoop
author | tatsuki |
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date | Fri, 20 Mar 2015 21:04:03 +0900 |
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package fj.function; import fj.F; import fj.F2; import fj.data.Stream; import static fj.Function.curry; import static fj.function.Booleans.not; import static fj.function.Characters.isWhitespace; /** * Curried string functions. * * @version %build.number% */ public final class Strings { private Strings() { throw new UnsupportedOperationException(); } /** * This function checks if a given String contains any non-whitespace character * (according to {@link Character#isWhitespace(char)}) and if it's also not * <code>null</code> and not empty (""). * * @see #isNullOrBlank * @see Character#isWhitespace(char) * @see Characters#isWhitespace */ public static final F<String, Boolean> isNotNullOrBlank = new F<String, Boolean>() { @Override public Boolean f(final String a) { return isNotNullOrEmpty.f(a) && Stream.fromString(a).find(not(isWhitespace)).isSome(); } }; /** * This function checks if a given String is whitespace (according to {@link Character#isWhitespace(char)}), * empty ("") or <code>null</code>. * * @see #isNotNullOrBlank * @see Character#isWhitespace(char) * @see Characters#isWhitespace */ public static final F<String, Boolean> isNullOrBlank = new F<String, Boolean>() { @Override public Boolean f(final String a) { return isNullOrEmpty.f(a) || Stream.fromString(a).find(not(isWhitespace)).isNone(); } }; /** * This function checks if a given String is neither <code>null</code> nor empty. * * @see #isNullOrEmpty */ public static final F<String, Boolean> isNotNullOrEmpty = new F<String, Boolean>() { @Override public Boolean f(final String a) { return a != null && a.length() > 0; } }; /** * This function checks if a given String is <code>null</code> or empty ({@link String#isEmpty()}). * * @see #isNotNullOrEmpty */ public static final F<String, Boolean> isNullOrEmpty = new F<String, Boolean>() { @Override public Boolean f(final String a) { return a == null || a.length() == 0; } }; /** * A curried version of {@link String#isEmpty()}. */ public static final F<String, Boolean> isEmpty = new F<String, Boolean>() { public Boolean f(final String s) { return s.length() == 0; } }; /** * A curried version of {@link String#length()}. */ public static final F<String, Integer> length = new F<String, Integer>() { public Integer f(final String s) { return s.length(); } }; /** * A curried version of {@link String#contains(CharSequence)}. * The function returns true if the second argument contains the first. */ public static final F<String, F<String, Boolean>> contains = curry(new F2<String, String, Boolean>() { public Boolean f(final String s1, final String s2) { return s2.contains(s1); } }); /** * A curried version of {@link String#matches(String)}. * The function returns true if the second argument matches the first. */ public static final F<String, F<String, Boolean>> matches = curry(new F2<String, String, Boolean>() { public Boolean f(final String s1, final String s2) { return s2.matches(s1); } }); }