Added conversion from fj to the base Java 8 function types

Mark Perry · Mark Perry · commit 8c88a73727c6 · 2014-06-03T11:47:15.000+10:00
diff --git a/.gitignore b/.gitignore
@@ -10,6 +10,5 @@ build
 .settings
 .classpath
 .project
-
-
+.DS_Store
 
diff --git a/java8/build.gradle b/java8/build.gradle
@@ -0,0 +1,32 @@
+
+buildscript {
+    repositories {
+        mavenCentral()
+    }
+
+    dependencies {
+        classpath 'me.tatarka:gradle-retrolambda:1.3.1'
+    }
+}
+
+apply plugin: 'java'
+apply plugin: 'retrolambda'
+
+defaultTasks 'build'
+
+repositories {
+    mavenCentral()
+}
+
+retrolambda {
+    jdk System.getenv("JAVA8_HOME")
+    oldJdk System.getenv("JAVA7_HOME")
+    javaVersion JavaVersion.VERSION_1_7
+}
+
+dependencies {
+//    compile 'org.slf4j:slf4j-api:1.7.5'
+    compile project(":core")
+
+    testCompile "junit:junit:4.11"
+}
diff --git a/java8/src/main/java/fj/data/Java8.java b/java8/src/main/java/fj/data/Java8.java
@@ -0,0 +1,44 @@
+package fj.data;
+
+import fj.F;
+import fj.F2;
+import fj.P1;
+
+import java.util.function.BiFunction;
+import java.util.function.Function;
+import java.util.function.Supplier;
+
+/**
+ * Created by mperry on 3/06/2014.
+ */
+public final class Java8 {
+
+    private Java8() {
+        throw new UnsupportedOperationException();
+    }
+
+    public static <A> P1<A> toP1(Supplier<A> f) {
+        return () -> f.get();
+    }
+
+    public static <A> Supplier<A> toSupplier(P1<A> p) {
+        return () -> p._1();
+    }
+
+    public static <A, B> F<A, B> toF(Function<A, B> f) {
+        return a -> f.apply(a);
+    }
+
+    public static <A, B> F<A, B> toFunction(F<A, B> f) {
+        return a -> f.f(a);
+    }
+
+    public static <A, B, C> F2<A, B, C> toF2(BiFunction<A, B, C> f) {
+        return (a, b) -> f.apply(a, b);
+    }
+
+    public static <A, B, C> BiFunction<A, B, C> toBiFunction(F2<A, B, C> f) {
+        return (a, b) -> f.f(a, b);
+    }
+
+}
diff --git a/settings.gradle b/settings.gradle
@@ -1,5 +1,5 @@
 
-include 'core', 'demo', "tests", "consume"
+include 'core', 'demo', "tests", "consume", "java8"
 // The final Java 8 release, (build 1.8.0-b132) does not work with Gradle and the Scala plugin
 // see http://issues.gradle.org/browse/GRADLE-3023
 
