Merge pull request #241 from JarvisCraft/functional-shorthands

JarvisCraft · Aug 31, 2021 · 3d2b151 · 3d2b151
2 parents 41e5685 + 6b65fc8
commit 3d2b151
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Showing 2 changed files with 34 additions and 2 deletions.
diff --git a/...arker/includes/ru/progrm_jarvis/javacommons/util/function/PrimitivePredicateBase.java.ftl b/...arker/includes/ru/progrm_jarvis/javacommons/util/function/PrimitivePredicateBase.java.ftl
@@ -143,7 +143,7 @@ public interface ${className} extends Predicate${'<@NotNull ${wrapperType}>'}<#i
     /**
      * Creates a predicate which is always {@code true}.
      *
-     * @return predicate which is always {@code true}.
+     * @return predicate which is always {@code true}
      */
     @Contract(value = "-> _", pure = true)
     static @NotNull DoublePredicate alwaysTrue() {
@@ -153,7 +153,7 @@ public interface ${className} extends Predicate${'<@NotNull ${wrapperType}>'}<#i
     /**
      * Creates a predicate which is always {@code false}.
      *
-     * @return predicate which is always {@code false}.
+     * @return predicate which is always {@code false}
      */
     @Contract(value = "-> _", pure = true)
     static @NotNull DoublePredicate alwaysFalse() {

diff --git a/java-commons/src/main/java/ru/progrm_jarvis/javacommons/util/function/Predicates.java b/java-commons/src/main/java/ru/progrm_jarvis/javacommons/util/function/Predicates.java
@@ -0,0 +1,32 @@
+package ru.progrm_jarvis.javacommons.util.function;
+
+import lombok.experimental.UtilityClass;
+import org.jetbrains.annotations.NotNull;
+import ru.progrm_jarvis.javacommons.annotation.Any;
+
+import java.util.function.Predicate;
+
+/**
+ * Common implementations of {@link Predicate}.
+ */
+@UtilityClass
+public class Predicates {
+
+    /**
+     * Creates a predicate which is always {@code true}.
+     *
+     * @return predicate which is always {@code true}
+     */
+    public <@Any T> @NotNull Predicate<T> alwaysTrue() {
+        return value -> true;
+    }
+
+    /**
+     * Creates a predicate which is always {@code false}.
+     *
+     * @return predicate which is always {@code false}
+     */
+    public <@Any T> @NotNull Predicate<T> alwaysFalse() {
+        return value -> false;
+    }
+}