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test/org/apache/el/parser/TestAstLambdaExpression.java

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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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.apache.el.parser;
+
+import javax.el.ELException;
+import javax.el.ELProcessor;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class TestAstLambdaExpression {
+
+    @Test
+    public void testSpec01() {
+        ELProcessor processor = new ELProcessor();
+        Object result = processor.getValue("(x->x+1)(1)", Integer.class);
+        Assert.assertEquals(Integer.valueOf(2), result);
+    }
+
+
+    @Test
+    public void testSpec02() {
+        ELProcessor processor = new ELProcessor();
+        Object result = processor.getValue("((x,y)->x+y)(1,2)", Integer.class);
+        Assert.assertEquals(Integer.valueOf(3), result);
+    }
+
+
+    @Test
+    public void testSpec03() {
+        ELProcessor processor = new ELProcessor();
+        Object result = processor.getValue("(()->64)", Integer.class);
+        Assert.assertEquals(Integer.valueOf(64), result);
+    }
+
+
+    @Test
+    public void testSpec04() {
+        ELProcessor processor = new ELProcessor();
+        Object result =
+                processor.getValue("v = (x,y)->x+y; v(3,4)", Integer.class);
+        Assert.assertEquals(Integer.valueOf(7), result);
+    }
+
+
+    @Test
+    public void testSpec05() {
+        ELProcessor processor = new ELProcessor();
+        Object result =
+                processor.getValue("fact = n -> n==0? 1: n*fact(n-1); fact(5)",
+                        Integer.class);
+        Assert.assertEquals(Integer.valueOf(120), result);
+    }
+
+
+    @Test
+    public void testSpec06() {
+        ELProcessor processor = new ELProcessor();
+        Object result =
+                processor.getValue("(x->y->x-y)(2)(1)",
+                        Integer.class);
+        Assert.assertEquals(Integer.valueOf(1), result);
+    }
+
+
+    @Test
+    public void testInvocation01() {
+        ELProcessor processor = new ELProcessor();
+        Object result =
+                processor.getValue("(()->2)()",
+                        Integer.class);
+        Assert.assertEquals(Integer.valueOf(2), result);
+    }
+
+
+    @Test
+    public void testNested01() {
+        ELProcessor processor = new ELProcessor();
+        Object result =
+                processor.getValue("(()->y->2-y)()(1)",
+                        Integer.class);
+        Assert.assertEquals(Integer.valueOf(1), result);
+    }
+
+
+    @Test
+    public void testNested02() {
+        ELProcessor processor = new ELProcessor();
+        Object result =
+                processor.getValue("(()->y->()->2-y)()(1)()",
+                        Integer.class);
+        Assert.assertEquals(Integer.valueOf(1), result);
+    }
+
+
+    @Test(expected=ELException.class)
+    public void testNested03() {
+        ELProcessor processor = new ELProcessor();
+        // More method parameters than there are nested lambda expressions
+        processor.getValue("(()->y->()->2-y)()(1)()()",
+                    Integer.class);
+    }
+
+
+    @Test
+    public void testNested04() {
+        ELProcessor processor = new ELProcessor();
+        Object result =
+                processor.getValue("(()->y->()->x->x-y)()(1)()(2)",
+                        Integer.class);
+        Assert.assertEquals(Integer.valueOf(1), result);
+    }
+
+
+    @Test
+    public void testNested05() {
+        ELProcessor processor = new ELProcessor();
+        Object result =
+                processor.getValue("(()->y->()->()->x->x-y)()(1)()()(2)",
+                        Integer.class);
+        Assert.assertEquals(Integer.valueOf(1), result);
+    }
+
+
+    @Test
+    public void testNested06() {
+        ELProcessor processor = new ELProcessor();
+        Object result =
+                processor.getValue("(()->y->()->()->x->x-y)()(1)()(3)(2)",
+                        Integer.class);
+        Assert.assertEquals(Integer.valueOf(1), result);
+    }
+
+
+    @Test
+    public void testNested07() {
+        ELProcessor processor = new ELProcessor();
+        Object result =
+                processor.getValue("()->()->()->42",
+                        Integer.class);
+        Assert.assertEquals(Integer.valueOf(42), result);
+    }
+
+
+    @Test
+    public void testLambdaAsFunction01() {
+        ELProcessor processor = new ELProcessor();
+        Object result =
+                processor.getValue("v = (x->y->x-y); v(2)(1)",
+                        Integer.class);
+        Assert.assertEquals(Integer.valueOf(1), result);
+    }
+
+
+    @Test
+    public void testLambdaAsFunction02() {
+        ELProcessor processor = new ELProcessor();
+        Object result =
+                processor.getValue("v = (()->y->2-y); v()(1)",
+                        Integer.class);
+        Assert.assertEquals(Integer.valueOf(1), result);
+    }
+
+
+    @Test
+    public void testLambdaAsFunction03() {
+        ELProcessor processor = new ELProcessor();
+        Object result =
+                processor.getValue("v = (()->y->()->2-y); v()(1)()",
+                        Integer.class);
+        Assert.assertEquals(Integer.valueOf(1), result);
+    }
+
+
+    @Test(expected=ELException.class)
+    public void testLambdaAsFunction04() {
+        ELProcessor processor = new ELProcessor();
+        // More method parameters than there are nested lambda expressions
+        processor.getValue("v = (()->y->()->2-y); v()(1)()()",
+                    Integer.class);
+    }
+
+
+    @Test
+    public void testLambdaAsFunction05() {
+        ELProcessor processor = new ELProcessor();
+        Object result =
+                processor.getValue("v = (()->y->()->x->x-y); v()(1)()(2)",
+                        Integer.class);
+        Assert.assertEquals(Integer.valueOf(1), result);
+    }
+
+
+    @Test
+    public void testLambdaAsFunction06() {
+        ELProcessor processor = new ELProcessor();
+        Object result =
+                processor.getValue("v = (()->y->()->()->x->x-y); v()(1)()()(2)",
+                        Integer.class);
+        Assert.assertEquals(Integer.valueOf(1), result);
+    }
+
+
+    @Test
+    public void testLambdaAsFunction07() {
+        ELProcessor processor = new ELProcessor();
+        Object result =
+                processor.getValue("v = (()->y->()->()->x->x-y); v()(1)()(3)(2)",
+                        Integer.class);
+        Assert.assertEquals(Integer.valueOf(1), result);
+    }
+
+
+    @Test(expected=javax.el.ELException.class)
+    public void testLambdaAsFunction08() {
+        // Using a name space for the function is not allowed
+        ELProcessor processor = new ELProcessor();
+        Object result =
+                processor.getValue("foo:v = (x)->x+1; foo:v(0)", Integer.class);
+        Assert.assertEquals(Integer.valueOf(1), result);
+    }
+}