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test/org/apache/el/TestValueExpressionImpl.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;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import javax.el.ELContext;
+import javax.el.ExpressionFactory;
+import javax.el.ValueExpression;
+import javax.el.ValueReference;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import org.apache.jasper.el.ELContextImpl;
+
+public class TestValueExpressionImpl {
+
+    @Test
+    public void testGetValueReference() {
+        ExpressionFactory factory = ExpressionFactory.newInstance();
+        ELContext context = new ELContextImpl(factory);
+
+        TesterBeanB beanB = new TesterBeanB();
+        beanB.setName("Tomcat");
+        ValueExpression var =
+            factory.createValueExpression(beanB, TesterBeanB.class);
+        context.getVariableMapper().setVariable("beanB", var);
+
+        ValueExpression ve = factory.createValueExpression(
+                context, "${beanB.name}", String.class);
+
+        // First check the basics work
+        String result = (String) ve.getValue(context);
+        Assert.assertEquals("Tomcat", result);
+
+        // Now check the value reference
+        ValueReference vr = ve.getValueReference(context);
+        Assert.assertNotNull(vr);
+
+        Assert.assertEquals(beanB, vr.getBase());
+        Assert.assertEquals("name", vr.getProperty());
+    }
+
+    @Test
+    public void testGetValueReferenceVariable() {
+        ExpressionFactory factory = ExpressionFactory.newInstance();
+        ELContext context = new ELContextImpl(factory);
+
+        TesterBeanB beanB = new TesterBeanB();
+        beanB.setName("Tomcat");
+        ValueExpression var =
+            factory.createValueExpression(beanB, TesterBeanB.class);
+        context.getVariableMapper().setVariable("beanB", var);
+
+        ValueExpression var2 = factory.createValueExpression(
+                context, "${beanB.name}", String.class);
+
+        context.getVariableMapper().setVariable("foo", var2);
+
+        ValueExpression ve = factory.createValueExpression(
+                context, "${foo}", ValueExpression.class);
+
+
+        // Now check the value reference
+        ValueReference vr = ve.getValueReference(context);
+        Assert.assertNotNull(vr);
+
+        Assert.assertEquals(beanB, vr.getBase());
+        Assert.assertEquals("name", vr.getProperty());
+    }
+
+    @Test
+    public void testBug49345() {
+        ExpressionFactory factory = ExpressionFactory.newInstance();
+        ELContext context = new ELContextImpl(factory);
+
+        TesterBeanA beanA = new TesterBeanA();
+        TesterBeanB beanB = new TesterBeanB();
+        beanB.setName("Tomcat");
+        beanA.setBean(beanB);
+
+        ValueExpression var =
+            factory.createValueExpression(beanA, TesterBeanA.class);
+        context.getVariableMapper().setVariable("beanA", var);
+
+        ValueExpression ve = factory.createValueExpression(
+                context, "${beanA.bean.name}", String.class);
+
+        // First check the basics work
+        String result = (String) ve.getValue(context);
+        Assert.assertEquals("Tomcat", result);
+
+        // Now check the value reference
+        ValueReference vr = ve.getValueReference(context);
+        Assert.assertNotNull(vr);
+
+        Assert.assertEquals(beanB, vr.getBase());
+        Assert.assertEquals("name", vr.getProperty());
+    }
+
+    @Test
+    public void testBug50105() {
+        ExpressionFactory factory = ExpressionFactory.newInstance();
+        ELContext context = new ELContextImpl(factory);
+
+        TesterEnum testEnum = TesterEnum.APPLE;
+
+        ValueExpression var =
+            factory.createValueExpression(testEnum, TesterEnum.class);
+        context.getVariableMapper().setVariable("testEnum", var);
+
+        // When coercing an Enum to a String, name() should always be used.
+        ValueExpression ve1 = factory.createValueExpression(
+                context, "${testEnum}", String.class);
+        String result1 = (String) ve1.getValue(context);
+        Assert.assertEquals("APPLE", result1);
+
+        ValueExpression ve2 = factory.createValueExpression(
+                context, "foo${testEnum}bar", String.class);
+        String result2 = (String) ve2.getValue(context);
+        Assert.assertEquals("fooAPPLEbar", result2);
+    }
+
+    @Test
+    public void testBug51177ObjectMap() {
+        ExpressionFactory factory = ExpressionFactory.newInstance();
+        ELContext context = new ELContextImpl(factory);
+
+        Object o1 = "String value";
+        Object o2 = Integer.valueOf(32);
+
+        Map<Object,Object> map = new HashMap<>();
+        map.put("key1", o1);
+        map.put("key2", o2);
+
+        ValueExpression var =
+            factory.createValueExpression(map, Map.class);
+        context.getVariableMapper().setVariable("map", var);
+
+        ValueExpression ve1 = factory.createValueExpression(
+                context, "${map.key1}", Object.class);
+        ve1.setValue(context, o2);
+        Assert.assertEquals(o2, ve1.getValue(context));
+
+        ValueExpression ve2 = factory.createValueExpression(
+                context, "${map.key2}", Object.class);
+        ve2.setValue(context, o1);
+        Assert.assertEquals(o1, ve2.getValue(context));
+    }
+
+    @Test
+    public void testBug51177ObjectList() {
+        ExpressionFactory factory = ExpressionFactory.newInstance();
+        ELContext context = new ELContextImpl(factory);
+
+        Object o1 = "String value";
+        Object o2 = Integer.valueOf(32);
+
+        List<Object> list = new ArrayList<>();
+        list.add(0, o1);
+        list.add(1, o2);
+
+        ValueExpression var =
+            factory.createValueExpression(list, List.class);
+        context.getVariableMapper().setVariable("list", var);
+
+        ValueExpression ve1 = factory.createValueExpression(
+                context, "${list[0]}", Object.class);
+        ve1.setValue(context, o2);
+        Assert.assertEquals(o2, ve1.getValue(context));
+
+        ValueExpression ve2 = factory.createValueExpression(
+                context, "${list[1]}", Object.class);
+        ve2.setValue(context, o1);
+        Assert.assertEquals(o1, ve2.getValue(context));
+    }
+
+
+    /*
+     * Test returning an empty list as a bean property.
+     */
+    @Test
+    public void testBug51544Bean() throws Exception {
+        ExpressionFactory factory = ExpressionFactory.newInstance();
+        ELContext context = new ELContextImpl(factory);
+
+        TesterBeanA beanA = new TesterBeanA();
+        beanA.setValList(Collections.emptyList());
+
+        ValueExpression var =
+            factory.createValueExpression(beanA, TesterBeanA.class);
+        context.getVariableMapper().setVariable("beanA", var);
+
+        ValueExpression ve = factory.createValueExpression(
+                context, "${beanA.valList.size()}", Integer.class);
+
+        Integer result = (Integer) ve.getValue(context);
+        Assert.assertEquals(Integer.valueOf(0), result);
+    }
+
+
+    /*
+     * Test using list directly as variable.
+     */
+    @Test
+    public void testBug51544Direct() throws Exception {
+        ExpressionFactory factory = ExpressionFactory.newInstance();
+        ELContext context = new ELContextImpl(factory);
+
+        List<?> list = Collections.emptyList();
+
+        ValueExpression var =
+            factory.createValueExpression(list, List.class);
+        context.getVariableMapper().setVariable("list", var);
+
+        ValueExpression ve = factory.createValueExpression(
+                context, "${list.size()}", Integer.class);
+
+        Integer result = (Integer) ve.getValue(context);
+        Assert.assertEquals(Integer.valueOf(0), result);
+    }
+
+
+    @Test
+    public void testBug56522SetNullValue() {
+        ExpressionFactory factory = ExpressionFactory.newInstance();
+        ELContext context = new ELContextImpl(factory);
+
+        TesterBeanB beanB = new TesterBeanB();
+        beanB.setName("Tomcat");
+        ValueExpression var =
+            factory.createValueExpression(beanB, TesterBeanB.class);
+        context.getVariableMapper().setVariable("beanB", var);
+
+        ValueExpression ve = factory.createValueExpression(
+                context, "${beanB.name}", String.class);
+
+        // First check the basics work
+        String result = (String) ve.getValue(context);
+        Assert.assertEquals("Tomcat", result);
+
+        // Now set the value to null
+        ve.setValue(context, null);
+
+        Assert.assertEquals("", beanB.getName());
+    }
+}