ClojureAdaptor

Very basic support that allows clojure/java interop using the fn function rather than Clojure code needing to use proxy/reify and implement full java interfaces.

Author: benjchristensen

language-adaptors/rxjava-clojure/build.gradle

@@ -0,0 +1,7 @@
+apply plugin: 'java'
+dependencies {
+    compile project(':rxjava-core')
+    compile 'org.clojure:clojure:1.5.+'
+    provided 'junit:junit:4.10'
+    provided 'org.mockito:mockito-core:1.9.5'
+}

language-adaptors/rxjava-clojure/src/main/java/org/rx/lang/clojure/ClojureAdaptor.java

@@ -0,0 +1,129 @@
+/**
+ * Copyright 2013 Netflix, Inc.
+ * 
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.rx.lang.clojure;
+
+import static org.mockito.Mockito.*;
+
+import java.util.Arrays;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+import org.rx.functions.FunctionLanguageAdaptor;
+import org.rx.reactive.Observer;
+
+import clojure.lang.IFn;
+import clojure.lang.RT;
+import clojure.lang.Var;
+
+public class ClojureAdaptor implements FunctionLanguageAdaptor {
+
+    @Override
+    public Object call(Object function, Object[] args) {
+        if (args.length == 0) {
+            return ((IFn) function).invoke();
+        } else if (args.length == 1) {
+            return ((IFn) function).invoke(args[0]);
+        } else if (args.length == 2) {
+            return ((IFn) function).invoke(args[0], args[1]);
+        } else if (args.length == 3) {
+            return ((IFn) function).invoke(args[0], args[1], args[2]);
+        } else if (args.length == 4) {
+            return ((IFn) function).invoke(args[0], args[1], args[2], args[3]);
+        } else if (args.length == 5) {
+            return ((IFn) function).invoke(args[0], args[1], args[2], args[3], args[4]);
+        } else if (args.length == 6) {
+            return ((IFn) function).invoke(args[0], args[1], args[2], args[3], args[4], args[5]);
+        } else if (args.length == 7) {
+            return ((IFn) function).invoke(args[0], args[1], args[2], args[3], args[4], args[5], args[6]);
+        } else if (args.length == 8) {
+            return ((IFn) function).invoke(args[0], args[1], args[2], args[3], args[4], args[5], args[6], args[7]);
+        } else if (args.length == 9) {
+            return ((IFn) function).invoke(args[0], args[1], args[2], args[3], args[4], args[5], args[6], args[7], args[8]);
+        } else if (args.length == 10) {
+            return ((IFn) function).invoke(args[0], args[1], args[2], args[3], args[4], args[5], args[6], args[7], args[8], args[9]);
+        } else if (args.length == 11) {
+            return ((IFn) function).invoke(args[0], args[1], args[2], args[3], args[4], args[5], args[6], args[7], args[8], args[9], args[10]);
+        } else if (args.length == 12) {
+            return ((IFn) function).invoke(args[0], args[1], args[2], args[3], args[4], args[5], args[6], args[7], args[8], args[9], args[10], args[11]);
+        } else if (args.length == 13) {
+            return ((IFn) function).invoke(args[0], args[1], args[2], args[3], args[4], args[5], args[6], args[7], args[8], args[9], args[10], args[11], args[12]);
+        } else if (args.length == 14) {
+            return ((IFn) function).invoke(args[0], args[1], args[2], args[3], args[4], args[5], args[6], args[7], args[8], args[9], args[10], args[11], args[12], args[13]);
+        } else if (args.length == 15) {
+            return ((IFn) function).invoke(args[0], args[1], args[2], args[3], args[4], args[5], args[6], args[7], args[8], args[9], args[10], args[11], args[12], args[13], args[14]);
+        } else if (args.length == 16) {
+            return ((IFn) function).invoke(args[0], args[1], args[2], args[3], args[4], args[5], args[6], args[7], args[8], args[9], args[10], args[11], args[12], args[13], args[14], args[15]);
+        } else if (args.length == 17) {
+            return ((IFn) function).invoke(args[0], args[1], args[2], args[3], args[4], args[5], args[6], args[7], args[8], args[9], args[10], args[11], args[12], args[13], args[14], args[15], args[16]);
+        } else if (args.length == 18) {
+            return ((IFn) function).invoke(args[0], args[1], args[2], args[3], args[4], args[5], args[6], args[7], args[8], args[9], args[10], args[11], args[12], args[13], args[14], args[15], args[16], args[17]);
+        } else if (args.length == 19) {
+            return ((IFn) function).invoke(args[0], args[1], args[2], args[3], args[4], args[5], args[6], args[7], args[8], args[9], args[10], args[11], args[12], args[13], args[14], args[15], args[16], args[17], args[18]);
+        } else if (args.length == 20) {
+            return ((IFn) function).invoke(args[0], args[1], args[2], args[3], args[4], args[5], args[6], args[7], args[8], args[9], args[10], args[11], args[12], args[13], args[14], args[15], args[16], args[17], args[18], args[19]);
+        } else {
+            return ((IFn) function).invoke(args[0], args[1], args[2], args[3], args[4], args[5], args[6], args[7], args[8], args[9], args[10], args[11], args[12], args[13], args[14], args[15], args[16], args[17], args[18], args[19], Arrays.copyOfRange(args, 20, args.length));
+        }
+    }
+
+    @Override
+    public Class<?> getFunctionClass() {
+        return IFn.class;
+    }
+
+    public static class UnitTest {
+
+        @Mock
+        ScriptAssertion assertion;
+
+        @Mock
+        Observer<Integer> w;
+
+        @Before
+        public void before() {
+            MockitoAnnotations.initMocks(this);
+        }
+
+        @Test
+        public void testTake() {
+            runClojureScript("(-> (org.rx.reactive.Observable/toObservable [\"one\" \"two\" \"three\"]) (.take 2) (.subscribe (fn [arg] (println arg))))");
+        }
+
+        // commented out for now as I can't figure out how to set the var 'a' with the 'assertion' instance when running the code from java 
+        //        @Test
+        //        public void testFilter() {
+        //            runClojureScript("(-> (org.rx.reactive.Observable/toObservable [1 2 3])  (.filter (fn [v] (>= v 2))) (.subscribe (fn [result] (a.received(result)))))");
+        //            verify(assertion, times(0)).received(1);
+        //            verify(assertion, times(1)).received(2);
+        //            verify(assertion, times(1)).received(3);
+        //        }
+
+        private static interface ScriptAssertion {
+            public void error(Exception o);
+
+            public void received(Object o);
+        }
+
+        private void runClojureScript(String script) {
+            Object code = RT.var("clojure.core", "read-string").invoke(script);
+            Var eval = RT.var("clojure.core", "eval");
+            Object result = eval.invoke(code);
+            System.out.println("Result: " + result);
+        }
+    }
+}

settings.gradle

@@ -1,4 +1,5 @@
 rootProject.name='rxjava'
 include 'rxjava-core', \
 'language-adaptors:rxjava-groovy', \
-'language-adaptors:rxjava-jruby'
+'language-adaptors:rxjava-jruby', \
+'language-adaptors:rxjava-clojure'