/*
* Copyright 2002-2014 the original author or authors.
*
* 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.springframework.expression.spel;
import java.lang.annotation.Annotation;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;
import org.junit.Test;
import org.springframework.core.convert.TypeDescriptor;
import org.springframework.expression.AccessException;
import org.springframework.expression.BeanResolver;
import org.springframework.expression.EvaluationContext;
import org.springframework.expression.Expression;
import org.springframework.expression.ExpressionInvocationTargetException;
import org.springframework.expression.MethodExecutor;
import org.springframework.expression.MethodFilter;
import org.springframework.expression.MethodResolver;
import org.springframework.expression.spel.standard.SpelExpression;
import org.springframework.expression.spel.standard.SpelExpressionParser;
import org.springframework.expression.spel.support.StandardEvaluationContext;
import org.springframework.expression.spel.testresources.PlaceOfBirth;
import static org.junit.Assert.*;
/**
* Tests invocation of methods.
*
* @author Andy Clement
* @author Phillip Webb
*/
public class MethodInvocationTests extends AbstractExpressionTests {
@Test
public void testSimpleAccess01() {
evaluate("getPlaceOfBirth().getCity()", "SmilJan", String.class);
}
// public void testBuiltInProcessors() {
// evaluate("new int[]{1,2,3,4}.count()", 4, Integer.class);
// evaluate("new int[]{4,3,2,1}.sort()[3]", 4, Integer.class);
// evaluate("new int[]{4,3,2,1}.average()", 2, Integer.class);
// evaluate("new int[]{4,3,2,1}.max()", 4, Integer.class);
// evaluate("new int[]{4,3,2,1}.min()", 1, Integer.class);
// evaluate("new int[]{4,3,2,1,2,3}.distinct().count()", 4, Integer.class);
// evaluate("{1,2,3,null}.nonnull().count()", 3, Integer.class);
// evaluate("new int[]{4,3,2,1,2,3}.distinct().count()", 4, Integer.class);
// }
@Test
public void testStringClass() {
evaluate("new java.lang.String('hello').charAt(2)", 'l', Character.class);
evaluate("new java.lang.String('hello').charAt(2).equals('l'.charAt(0))", true, Boolean.class);
evaluate("'HELLO'.toLowerCase()", "hello", String.class);
evaluate("' abcba '.trim()", "abcba", String.class);
}
@Test
public void testNonExistentMethods() {
// name is ok but madeup() does not exist
evaluateAndCheckError("name.madeup()", SpelMessage.METHOD_NOT_FOUND, 5);
}
@Test
public void testWidening01() {
// widening of int 3 to double 3 is OK
evaluate("new Double(3.0d).compareTo(8)", -1, Integer.class);
evaluate("new Double(3.0d).compareTo(3)", 0, Integer.class);
evaluate("new Double(3.0d).compareTo(2)", 1, Integer.class);
}
@Test
public void testArgumentConversion01() {
// Rely on Double>String conversion for calling startsWith()
evaluate("new String('hello 2.0 to you').startsWith(7.0d)", false, Boolean.class);
evaluate("new String('7.0 foobar').startsWith(7.0d)", true, Boolean.class);
}
@Test
public void testMethodThrowingException_SPR6760() {
// Test method on inventor: throwException()
// On 1 it will throw an IllegalArgumentException
// On 2 it will throw a RuntimeException
// On 3 it will exit normally
// In each case it increments the Inventor field 'counter' when invoked
SpelExpressionParser parser = new SpelExpressionParser();
Expression expr = parser.parseExpression("throwException(#bar)");
// Normal exit
StandardEvaluationContext eContext = TestScenarioCreator.getTestEvaluationContext();
eContext.setVariable("bar",3);
Object o = expr.getValue(eContext);
assertEquals(o, 3);
assertEquals(1, parser.parseExpression("counter").getValue(eContext));
// Now the expression has cached that throwException(int) is the right thing to call
// Let's change 'bar' to be a PlaceOfBirth which indicates the cached reference is
// out of date.
eContext.setVariable("bar",new PlaceOfBirth("London"));
o = expr.getValue(eContext);
assertEquals("London", o);
// That confirms the logic to mark the cached reference stale and retry is working
// Now let's cause the method to exit via exception and ensure it doesn't cause
// a retry.
// First, switch back to throwException(int)
eContext.setVariable("bar",3);
o = expr.getValue(eContext);
assertEquals(3, o);
assertEquals(2, parser.parseExpression("counter").getValue(eContext));
// Now cause it to throw an exception:
eContext.setVariable("bar",1);
try {
o = expr.getValue(eContext);
fail();
} catch (Exception e) {
if (e instanceof SpelEvaluationException) {
e.printStackTrace();
fail("Should not be a SpelEvaluationException");
}
// normal
}
// If counter is 4 then the method got called twice!
assertEquals(3, parser.parseExpression("counter").getValue(eContext));
eContext.setVariable("bar",4);
try {
o = expr.getValue(eContext);
fail();
} catch (Exception e) {
// 4 means it will throw a checked exception - this will be wrapped
if (!(e instanceof ExpressionInvocationTargetException)) {
e.printStackTrace();
fail("Should have been wrapped");
}
// normal
}
// If counter is 5 then the method got called twice!
assertEquals(4, parser.parseExpression("counter").getValue(eContext));
}
/**
* Check on first usage (when the cachedExecutor in MethodReference is null) that the exception is not wrapped.
*/
@Test
public void testMethodThrowingException_SPR6941() {
// Test method on inventor: throwException()
// On 1 it will throw an IllegalArgumentException
// On 2 it will throw a RuntimeException
// On 3 it will exit normally
// In each case it increments the Inventor field 'counter' when invoked
SpelExpressionParser parser = new SpelExpressionParser();
Expression expr = parser.parseExpression("throwException(#bar)");
eContext.setVariable("bar",2);
try {
expr.getValue(eContext);
fail();
} catch (Exception e) {
if (e instanceof SpelEvaluationException) {
e.printStackTrace();
fail("Should not be a SpelEvaluationException");
}
// normal
}
}
@Test
public void testMethodThrowingException_SPR6941_2() {
// Test method on inventor: throwException()
// On 1 it will throw an IllegalArgumentException
// On 2 it will throw a RuntimeException
// On 3 it will exit normally
// In each case it increments the Inventor field 'counter' when invoked
SpelExpressionParser parser = new SpelExpressionParser();
Expression expr = parser.parseExpression("throwException(#bar)");
eContext.setVariable("bar",4);
try {
expr.getValue(eContext);
fail();
} catch (ExpressionInvocationTargetException e) {
Throwable t = e.getCause();
assertEquals(
"org.springframework.expression.spel.testresources.Inventor$TestException",
t.getClass().getName());
return;
}
fail("Should not be a SpelEvaluationException");
}
@Test
public void testMethodFiltering_SPR6764() {
SpelExpressionParser parser = new SpelExpressionParser();
StandardEvaluationContext context = new StandardEvaluationContext();
context.setRootObject(new TestObject());
LocalFilter filter = new LocalFilter();
context.registerMethodFilter(TestObject.class,filter);
// Filter will be called but not do anything, so first doit() will be invoked
SpelExpression expr = (SpelExpression) parser.parseExpression("doit(1)");
String result = expr.getValue(context,String.class);
assertEquals("1", result);
assertTrue(filter.filterCalled);
// Filter will now remove non @Anno annotated methods
filter.removeIfNotAnnotated = true;
filter.filterCalled = false;
expr = (SpelExpression) parser.parseExpression("doit(1)");
result = expr.getValue(context,String.class);
assertEquals("double 1.0", result);
assertTrue(filter.filterCalled);
// check not called for other types
filter.filterCalled=false;
context.setRootObject(new String("abc"));
expr = (SpelExpression) parser.parseExpression("charAt(0)");
result = expr.getValue(context,String.class);
assertEquals("a", result);
assertFalse(filter.filterCalled);
// check de-registration works
filter.filterCalled = false;
context.registerMethodFilter(TestObject.class,null);//clear filter
context.setRootObject(new TestObject());
expr = (SpelExpression) parser.parseExpression("doit(1)");
result = expr.getValue(context,String.class);
assertEquals("1", result);
assertFalse(filter.filterCalled);
}
// Simple filter
static class LocalFilter implements MethodFilter {
public boolean removeIfNotAnnotated = false;
public boolean filterCalled = false;
private boolean isAnnotated(Method m) {
Annotation[] annos = m.getAnnotations();
if (annos==null) {
return false;
}
for (Annotation anno: annos) {
String s = anno.annotationType().getName();
if (s.endsWith("Anno")) {
return true;
}
}
return false;
}
@Override
public List<Method> filter(List<Method> methods) {
filterCalled = true;
List<Method> forRemoval = new ArrayList<Method>();
for (Method m: methods) {
if (removeIfNotAnnotated && !isAnnotated(m)) {
forRemoval.add(m);
}
}
for (Method m: forRemoval) {
methods.remove(m);
}
return methods;
}
}
@Retention(RetentionPolicy.RUNTIME)
@interface Anno {}
class TestObject {
public int doit(int i) {
return i;
}
@Anno
public String doit(double d) {
return "double "+d;
}
}
@Test
public void testAddingMethodResolvers() {
StandardEvaluationContext ctx = new StandardEvaluationContext();
// reflective method accessor is the only one by default
List<MethodResolver> methodResolvers = ctx.getMethodResolvers();
assertEquals(1, methodResolvers.size());
MethodResolver dummy = new DummyMethodResolver();
ctx.addMethodResolver(dummy);
assertEquals(2, ctx.getMethodResolvers().size());
List<MethodResolver> copy = new ArrayList<MethodResolver>();
copy.addAll(ctx.getMethodResolvers());
assertTrue(ctx.removeMethodResolver(dummy));
assertFalse(ctx.removeMethodResolver(dummy));
assertEquals(1, ctx.getMethodResolvers().size());
ctx.setMethodResolvers(copy);
assertEquals(2, ctx.getMethodResolvers().size());
}
static class DummyMethodResolver implements MethodResolver {
@Override
public MethodExecutor resolve(EvaluationContext context, Object targetObject, String name,
List<TypeDescriptor> argumentTypes) throws AccessException {
throw new UnsupportedOperationException("Auto-generated method stub");
}
}
@Test
public void testVarargsInvocation01() {
// Calling 'public int aVarargsMethod(String... strings)'
//evaluate("aVarargsMethod('a','b','c')", 3, Integer.class);
//evaluate("aVarargsMethod('a')", 1, Integer.class);
evaluate("aVarargsMethod()", 0, Integer.class);
evaluate("aVarargsMethod(1,2,3)", 3, Integer.class); // all need converting to strings
evaluate("aVarargsMethod(1)", 1, Integer.class); // needs string conversion
evaluate("aVarargsMethod(1,'a',3.0d)", 3, Integer.class); // first and last need conversion
// evaluate("aVarargsMethod(new String[]{'a','b','c'})", 3, Integer.class);
}
@Test
public void testVarargsInvocation02() {
// Calling 'public int aVarargsMethod2(int i, String... strings)' - returns int+length_of_strings
evaluate("aVarargsMethod2(5,'a','b','c')", 8, Integer.class);
evaluate("aVarargsMethod2(2,'a')", 3, Integer.class);
evaluate("aVarargsMethod2(4)", 4, Integer.class);
evaluate("aVarargsMethod2(8,2,3)", 10, Integer.class);
evaluate("aVarargsMethod2(9)", 9, Integer.class);
evaluate("aVarargsMethod2(2,'a',3.0d)", 4, Integer.class);
// evaluate("aVarargsMethod2(8,new String[]{'a','b','c'})", 11, Integer.class);
}
@Test
public void testInvocationOnNullContextObject() {
evaluateAndCheckError("null.toString()",SpelMessage.METHOD_CALL_ON_NULL_OBJECT_NOT_ALLOWED);
}
@Test
public void testMethodOfClass() throws Exception {
Expression expression = parser.parseExpression("getName()");
Object value = expression.getValue(new StandardEvaluationContext(String.class));
assertEquals(value, "java.lang.String");
}
@Test
public void invokeMethodWithoutConversion() throws Exception {
final BytesService service = new BytesService();
byte[] bytes = new byte[100];
StandardEvaluationContext context = new StandardEvaluationContext(bytes);
context.setBeanResolver(new BeanResolver() {
@Override
public Object resolve(EvaluationContext context, String beanName)
throws AccessException {
if ("service".equals(beanName)) {
return service;
}
return null;
}
});
Expression expression = parser.parseExpression("@service.handleBytes(#root)");
byte[] outBytes = expression.getValue(context, byte[].class);
assertSame(bytes, outBytes);
}
public static class BytesService {
public byte[] handleBytes(byte[] bytes) {
return bytes;
}
}
}