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SpelCompilationCoverageTests.java
6279 lines (5289 loc) · 214 KB
/
SpelCompilationCoverageTests.java
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/*
* Copyright 2002-2019 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
*
* https://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.io.IOException;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.StringTokenizer;
import org.junit.Test;
import org.springframework.asm.MethodVisitor;
import org.springframework.expression.AccessException;
import org.springframework.expression.EvaluationContext;
import org.springframework.expression.Expression;
import org.springframework.expression.TypedValue;
import org.springframework.expression.spel.ast.CompoundExpression;
import org.springframework.expression.spel.ast.OpLT;
import org.springframework.expression.spel.ast.SpelNodeImpl;
import org.springframework.expression.spel.ast.Ternary;
import org.springframework.expression.spel.standard.SpelCompiler;
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.testdata.PersonInOtherPackage;
import static org.junit.Assert.*;
/**
* Checks SpelCompiler behavior. This should cover compilation all compiled node types.
*
* @author Andy Clement
* @since 4.1
*/
public class SpelCompilationCoverageTests extends AbstractExpressionTests {
/*
* Further TODOs for compilation:
*
* - OpMinus with a single literal operand could be treated as a negative literal. Will save a
* pointless loading of 0 and then a subtract instruction in code gen.
* - allow other accessors/resolvers to participate in compilation and create their own code
* - A TypeReference followed by (what ends up as) a static method invocation can really skip
* code gen for the TypeReference since once that is used to locate the method it is not
* used again.
* - The opEq implementation is quite basic. It will compare numbers of the same type (allowing
* them to be their boxed or unboxed variants) or compare object references. It does not
* compile expressions where numbers are of different types or when objects implement
* Comparable.
*
* Compiled nodes:
*
* TypeReference
* OperatorInstanceOf
* StringLiteral
* NullLiteral
* RealLiteral
* IntLiteral
* LongLiteral
* BooleanLiteral
* FloatLiteral
* OpOr
* OpAnd
* OperatorNot
* Ternary
* Elvis
* VariableReference
* OpLt
* OpLe
* OpGt
* OpGe
* OpEq
* OpNe
* OpPlus
* OpMinus
* OpMultiply
* OpDivide
* MethodReference
* PropertyOrFieldReference
* Indexer
* CompoundExpression
* ConstructorReference
* FunctionReference
* InlineList
* OpModulus
*
* Not yet compiled (some may never need to be):
* Assign
* BeanReference
* Identifier
* OpDec
* OpBetween
* OpMatches
* OpPower
* OpInc
* Projection
* QualifiedId
* Selection
*/
private Expression expression;
private SpelNodeImpl ast;
@Test
public void typeReference() throws Exception {
expression = parse("T(String)");
assertEquals(String.class, expression.getValue());
assertCanCompile(expression);
assertEquals(String.class, expression.getValue());
expression = parse("T(java.io.IOException)");
assertEquals(IOException.class, expression.getValue());
assertCanCompile(expression);
assertEquals(IOException.class, expression.getValue());
expression = parse("T(java.io.IOException[])");
assertEquals(IOException[].class, expression.getValue());
assertCanCompile(expression);
assertEquals(IOException[].class, expression.getValue());
expression = parse("T(int[][])");
assertEquals(int[][].class, expression.getValue());
assertCanCompile(expression);
assertEquals(int[][].class, expression.getValue());
expression = parse("T(int)");
assertEquals(Integer.TYPE, expression.getValue());
assertCanCompile(expression);
assertEquals(Integer.TYPE, expression.getValue());
expression = parse("T(byte)");
assertEquals(Byte.TYPE, expression.getValue());
assertCanCompile(expression);
assertEquals(Byte.TYPE, expression.getValue());
expression = parse("T(char)");
assertEquals(Character.TYPE, expression.getValue());
assertCanCompile(expression);
assertEquals(Character.TYPE, expression.getValue());
expression = parse("T(short)");
assertEquals(Short.TYPE, expression.getValue());
assertCanCompile(expression);
assertEquals(Short.TYPE, expression.getValue());
expression = parse("T(long)");
assertEquals(Long.TYPE, expression.getValue());
assertCanCompile(expression);
assertEquals(Long.TYPE, expression.getValue());
expression = parse("T(float)");
assertEquals(Float.TYPE, expression.getValue());
assertCanCompile(expression);
assertEquals(Float.TYPE, expression.getValue());
expression = parse("T(double)");
assertEquals(Double.TYPE, expression.getValue());
assertCanCompile(expression);
assertEquals(Double.TYPE, expression.getValue());
expression = parse("T(boolean)");
assertEquals(Boolean.TYPE, expression.getValue());
assertCanCompile(expression);
assertEquals(Boolean.TYPE, expression.getValue());
expression = parse("T(Missing)");
assertGetValueFail(expression);
assertCantCompile(expression);
}
@SuppressWarnings("unchecked")
@Test
public void operatorInstanceOf() throws Exception {
expression = parse("'xyz' instanceof T(String)");
assertEquals(true, expression.getValue());
assertCanCompile(expression);
assertEquals(true, expression.getValue());
expression = parse("'xyz' instanceof T(Integer)");
assertEquals(false, expression.getValue());
assertCanCompile(expression);
assertEquals(false, expression.getValue());
List<String> list = new ArrayList<>();
expression = parse("#root instanceof T(java.util.List)");
assertEquals(true, expression.getValue(list));
assertCanCompile(expression);
assertEquals(true, expression.getValue(list));
List<String>[] arrayOfLists = new List[] {new ArrayList<String>()};
expression = parse("#root instanceof T(java.util.List[])");
assertEquals(true, expression.getValue(arrayOfLists));
assertCanCompile(expression);
assertEquals(true, expression.getValue(arrayOfLists));
int[] intArray = new int[] {1,2,3};
expression = parse("#root instanceof T(int[])");
assertEquals(true, expression.getValue(intArray));
assertCanCompile(expression);
assertEquals(true, expression.getValue(intArray));
String root = null;
expression = parse("#root instanceof T(Integer)");
assertEquals(false, expression.getValue(root));
assertCanCompile(expression);
assertEquals(false, expression.getValue(root));
// root still null
expression = parse("#root instanceof T(java.lang.Object)");
assertEquals(false, expression.getValue(root));
assertCanCompile(expression);
assertEquals(false, expression.getValue(root));
root = "howdy!";
expression = parse("#root instanceof T(java.lang.Object)");
assertEquals(true, expression.getValue(root));
assertCanCompile(expression);
assertEquals(true, expression.getValue(root));
}
@Test
public void operatorInstanceOf_SPR14250() throws Exception {
// primitive left operand - should get boxed, return true
expression = parse("3 instanceof T(Integer)");
assertEquals(true, expression.getValue());
assertCanCompile(expression);
assertEquals(true, expression.getValue());
// primitive left operand - should get boxed, return false
expression = parse("3 instanceof T(String)");
assertEquals(false, expression.getValue());
assertCanCompile(expression);
assertEquals(false, expression.getValue());
// double slot left operand - should get boxed, return false
expression = parse("3.0d instanceof T(Integer)");
assertEquals(false, expression.getValue());
assertCanCompile(expression);
assertEquals(false, expression.getValue());
// double slot left operand - should get boxed, return true
expression = parse("3.0d instanceof T(Double)");
assertEquals(true, expression.getValue());
assertCanCompile(expression);
assertEquals(true, expression.getValue());
// Only when the right hand operand is a direct type reference
// will it be compilable.
StandardEvaluationContext ctx = new StandardEvaluationContext();
ctx.setVariable("foo", String.class);
expression = parse("3 instanceof #foo");
assertEquals(false, expression.getValue(ctx));
assertCantCompile(expression);
// use of primitive as type for instanceof check - compilable
// but always false
expression = parse("3 instanceof T(int)");
assertEquals(false, expression.getValue());
assertCanCompile(expression);
assertEquals(false, expression.getValue());
expression = parse("3 instanceof T(long)");
assertEquals(false, expression.getValue());
assertCanCompile(expression);
assertEquals(false, expression.getValue());
}
@Test
public void stringLiteral() throws Exception {
expression = parser.parseExpression("'abcde'");
assertEquals("abcde", expression.getValue(new TestClass1(), String.class));
assertCanCompile(expression);
String resultC = expression.getValue(new TestClass1(), String.class);
assertEquals("abcde", resultC);
assertEquals("abcde", expression.getValue(String.class));
assertEquals("abcde", expression.getValue());
assertEquals("abcde", expression.getValue(new StandardEvaluationContext()));
expression = parser.parseExpression("\"abcde\"");
assertCanCompile(expression);
assertEquals("abcde", expression.getValue(String.class));
}
@Test
public void nullLiteral() throws Exception {
expression = parser.parseExpression("null");
Object resultI = expression.getValue(new TestClass1(), Object.class);
assertCanCompile(expression);
Object resultC = expression.getValue(new TestClass1(), Object.class);
assertEquals(null, resultI);
assertEquals(null, resultC);
assertEquals(null, resultC);
}
@Test
public void realLiteral() throws Exception {
expression = parser.parseExpression("3.4d");
double resultI = expression.getValue(new TestClass1(), Double.TYPE);
assertCanCompile(expression);
double resultC = expression.getValue(new TestClass1(), Double.TYPE);
assertEquals(3.4d, resultI, 0.1d);
assertEquals(3.4d, resultC, 0.1d);
assertEquals(3.4d, expression.getValue());
}
@SuppressWarnings("rawtypes")
@Test
public void inlineList() throws Exception {
expression = parser.parseExpression("'abcde'.substring({1,3,4}[0])");
Object o = expression.getValue();
assertEquals("bcde",o);
assertCanCompile(expression);
o = expression.getValue();
assertEquals("bcde", o);
expression = parser.parseExpression("{'abc','def'}");
List<?> l = (List) expression.getValue();
assertEquals("[abc, def]", l.toString());
assertCanCompile(expression);
l = (List) expression.getValue();
assertEquals("[abc, def]", l.toString());
expression = parser.parseExpression("{'abc','def'}[0]");
o = expression.getValue();
assertEquals("abc",o);
assertCanCompile(expression);
o = expression.getValue();
assertEquals("abc", o);
expression = parser.parseExpression("{'abcde','ijklm'}[0].substring({1,3,4}[0])");
o = expression.getValue();
assertEquals("bcde",o);
assertCanCompile(expression);
o = expression.getValue();
assertEquals("bcde", o);
expression = parser.parseExpression("{'abcde','ijklm'}[0].substring({1,3,4}[0],{1,3,4}[1])");
o = expression.getValue();
assertEquals("bc",o);
assertCanCompile(expression);
o = expression.getValue();
assertEquals("bc", o);
}
@SuppressWarnings("rawtypes")
@Test
public void nestedInlineLists() throws Exception {
Object o = null;
expression = parser.parseExpression("{{1,2,3},{4,5,6},{7,8,9}}");
o = expression.getValue();
assertEquals("[[1, 2, 3], [4, 5, 6], [7, 8, 9]]",o.toString());
assertCanCompile(expression);
o = expression.getValue();
assertEquals("[[1, 2, 3], [4, 5, 6], [7, 8, 9]]",o.toString());
expression = parser.parseExpression("{{1,2,3},{4,5,6},{7,8,9}}.toString()");
o = expression.getValue();
assertEquals("[[1, 2, 3], [4, 5, 6], [7, 8, 9]]",o);
assertCanCompile(expression);
o = expression.getValue();
assertEquals("[[1, 2, 3], [4, 5, 6], [7, 8, 9]]",o);
expression = parser.parseExpression("{{1,2,3},{4,5,6},{7,8,9}}[1][0]");
o = expression.getValue();
assertEquals(4,o);
assertCanCompile(expression);
o = expression.getValue();
assertEquals(4,o);
expression = parser.parseExpression("{{1,2,3},'abc',{7,8,9}}[1]");
o = expression.getValue();
assertEquals("abc",o);
assertCanCompile(expression);
o = expression.getValue();
assertEquals("abc",o);
expression = parser.parseExpression("'abcde'.substring({{1,3},1,3,4}[0][1])");
o = expression.getValue();
assertEquals("de",o);
assertCanCompile(expression);
o = expression.getValue();
assertEquals("de", o);
expression = parser.parseExpression("'abcde'.substring({{1,3},1,3,4}[1])");
o = expression.getValue();
assertEquals("bcde",o);
assertCanCompile(expression);
o = expression.getValue();
assertEquals("bcde", o);
expression = parser.parseExpression("{'abc',{'def','ghi'}}");
List<?> l = (List) expression.getValue();
assertEquals("[abc, [def, ghi]]", l.toString());
assertCanCompile(expression);
l = (List) expression.getValue();
assertEquals("[abc, [def, ghi]]", l.toString());
expression = parser.parseExpression("{'abcde',{'ijklm','nopqr'}}[0].substring({1,3,4}[0])");
o = expression.getValue();
assertEquals("bcde",o);
assertCanCompile(expression);
o = expression.getValue();
assertEquals("bcde", o);
expression = parser.parseExpression("{'abcde',{'ijklm','nopqr'}}[1][0].substring({1,3,4}[0])");
o = expression.getValue();
assertEquals("jklm",o);
assertCanCompile(expression);
o = expression.getValue();
assertEquals("jklm", o);
expression = parser.parseExpression("{'abcde',{'ijklm','nopqr'}}[1][1].substring({1,3,4}[0],{1,3,4}[1])");
o = expression.getValue();
assertEquals("op",o);
assertCanCompile(expression);
o = expression.getValue();
assertEquals("op", o);
}
@Test
public void intLiteral() throws Exception {
expression = parser.parseExpression("42");
int resultI = expression.getValue(new TestClass1(), Integer.TYPE);
assertCanCompile(expression);
int resultC = expression.getValue(new TestClass1(), Integer.TYPE);
assertEquals(42, resultI);
assertEquals(42, resultC);
expression = parser.parseExpression("T(Integer).valueOf(42)");
expression.getValue(Integer.class);
assertCanCompile(expression);
assertEquals(new Integer(42), expression.getValue(Integer.class));
// Code gen is different for -1 .. 6 because there are bytecode instructions specifically for those values
// Not an int literal but an opminus with one operand:
// expression = parser.parseExpression("-1");
// assertCanCompile(expression);
// assertEquals(-1, expression.getValue());
expression = parser.parseExpression("0");
assertCanCompile(expression);
assertEquals(0, expression.getValue());
expression = parser.parseExpression("2");
assertCanCompile(expression);
assertEquals(2, expression.getValue());
expression = parser.parseExpression("7");
assertCanCompile(expression);
assertEquals(7, expression.getValue());
}
@Test
public void longLiteral() throws Exception {
expression = parser.parseExpression("99L");
long resultI = expression.getValue(new TestClass1(), Long.TYPE);
assertCanCompile(expression);
long resultC = expression.getValue(new TestClass1(), Long.TYPE);
assertEquals(99L, resultI);
assertEquals(99L, resultC);
}
@Test
public void booleanLiteral() throws Exception {
expression = parser.parseExpression("true");
boolean resultI = expression.getValue(1, Boolean.TYPE);
assertEquals(true, resultI);
assertTrue(SpelCompiler.compile(expression));
boolean resultC = expression.getValue(1, Boolean.TYPE);
assertEquals(true, resultC);
expression = parser.parseExpression("false");
resultI = expression.getValue(1, Boolean.TYPE);
assertEquals(false, resultI);
assertTrue(SpelCompiler.compile(expression));
resultC = expression.getValue(1, Boolean.TYPE);
assertEquals(false, resultC);
}
@Test
public void floatLiteral() throws Exception {
expression = parser.parseExpression("3.4f");
float resultI = expression.getValue(new TestClass1(), Float.TYPE);
assertCanCompile(expression);
float resultC = expression.getValue(new TestClass1(), Float.TYPE);
assertEquals(3.4f, resultI, 0.1f);
assertEquals(3.4f, resultC, 0.1f);
assertEquals(3.4f, expression.getValue());
}
@Test
public void opOr() throws Exception {
Expression expression = parser.parseExpression("false or false");
boolean resultI = expression.getValue(1, Boolean.TYPE);
SpelCompiler.compile(expression);
boolean resultC = expression.getValue(1, Boolean.TYPE);
assertEquals(false, resultI);
assertEquals(false, resultC);
expression = parser.parseExpression("false or true");
resultI = expression.getValue(1, Boolean.TYPE);
assertCanCompile(expression);
resultC = expression.getValue(1, Boolean.TYPE);
assertEquals(true, resultI);
assertEquals(true, resultC);
expression = parser.parseExpression("true or false");
resultI = expression.getValue(1, Boolean.TYPE);
assertCanCompile(expression);
resultC = expression.getValue(1, Boolean.TYPE);
assertEquals(true, resultI);
assertEquals(true, resultC);
expression = parser.parseExpression("true or true");
resultI = expression.getValue(1, Boolean.TYPE);
assertCanCompile(expression);
resultC = expression.getValue(1, Boolean.TYPE);
assertEquals(true, resultI);
assertEquals(true, resultC);
TestClass4 tc = new TestClass4();
expression = parser.parseExpression("getfalse() or gettrue()");
resultI = expression.getValue(tc, Boolean.TYPE);
assertCanCompile(expression);
resultC = expression.getValue(tc, Boolean.TYPE);
assertEquals(true, resultI);
assertEquals(true, resultC);
// Can't compile this as we aren't going down the getfalse() branch in our evaluation
expression = parser.parseExpression("gettrue() or getfalse()");
resultI = expression.getValue(tc, Boolean.TYPE);
assertCantCompile(expression);
expression = parser.parseExpression("getA() or getB()");
tc.a = true;
tc.b = true;
resultI = expression.getValue(tc, Boolean.TYPE);
assertCantCompile(expression); // Haven't yet been into second branch
tc.a = false;
tc.b = true;
resultI = expression.getValue(tc, Boolean.TYPE);
assertCanCompile(expression); // Now been down both
assertTrue(resultI);
boolean b = false;
expression = parse("#root or #root");
Object resultI2 = expression.getValue(b);
assertCanCompile(expression);
assertFalse((Boolean) resultI2);
assertFalse((Boolean) expression.getValue(b));
}
@Test
public void opAnd() throws Exception {
Expression expression = parser.parseExpression("false and false");
boolean resultI = expression.getValue(1, Boolean.TYPE);
SpelCompiler.compile(expression);
boolean resultC = expression.getValue(1, Boolean.TYPE);
assertEquals(false, resultI);
assertEquals(false, resultC);
expression = parser.parseExpression("false and true");
resultI = expression.getValue(1, Boolean.TYPE);
SpelCompiler.compile(expression);
resultC = expression.getValue(1, Boolean.TYPE);
assertEquals(false, resultI);
assertEquals(false, resultC);
expression = parser.parseExpression("true and false");
resultI = expression.getValue(1, Boolean.TYPE);
SpelCompiler.compile(expression);
resultC = expression.getValue(1, Boolean.TYPE);
assertEquals(false, resultI);
assertEquals(false, resultC);
expression = parser.parseExpression("true and true");
resultI = expression.getValue(1, Boolean.TYPE);
SpelCompiler.compile(expression);
resultC = expression.getValue(1, Boolean.TYPE);
assertEquals(true, resultI);
assertEquals(true, resultC);
TestClass4 tc = new TestClass4();
// Can't compile this as we aren't going down the gettrue() branch in our evaluation
expression = parser.parseExpression("getfalse() and gettrue()");
resultI = expression.getValue(tc, Boolean.TYPE);
assertCantCompile(expression);
expression = parser.parseExpression("getA() and getB()");
tc.a = false;
tc.b = false;
resultI = expression.getValue(tc, Boolean.TYPE);
assertCantCompile(expression); // Haven't yet been into second branch
tc.a = true;
tc.b = false;
resultI = expression.getValue(tc, Boolean.TYPE);
assertCanCompile(expression); // Now been down both
assertFalse(resultI);
tc.a = true;
tc.b = true;
resultI = expression.getValue(tc, Boolean.TYPE);
assertTrue(resultI);
boolean b = true;
expression = parse("#root and #root");
Object resultI2 = expression.getValue(b);
assertCanCompile(expression);
assertTrue((Boolean) resultI2);
assertTrue((Boolean) expression.getValue(b));
}
@Test
public void operatorNot() throws Exception {
expression = parse("!true");
assertEquals(false, expression.getValue());
assertCanCompile(expression);
assertEquals(false, expression.getValue());
expression = parse("!false");
assertEquals(true, expression.getValue());
assertCanCompile(expression);
assertEquals(true, expression.getValue());
boolean b = true;
expression = parse("!#root");
assertEquals(false, expression.getValue(b));
assertCanCompile(expression);
assertEquals(false, expression.getValue(b));
b = false;
expression = parse("!#root");
assertEquals(true, expression.getValue(b));
assertCanCompile(expression);
assertEquals(true, expression.getValue(b));
}
@Test
public void ternary() throws Exception {
Expression expression = parser.parseExpression("true?'a':'b'");
String resultI = expression.getValue(String.class);
assertCanCompile(expression);
String resultC = expression.getValue(String.class);
assertEquals("a", resultI);
assertEquals("a", resultC);
expression = parser.parseExpression("false?'a':'b'");
resultI = expression.getValue(String.class);
assertCanCompile(expression);
resultC = expression.getValue(String.class);
assertEquals("b", resultI);
assertEquals("b", resultC);
expression = parser.parseExpression("false?1:'b'");
// All literals so we can do this straight away
assertCanCompile(expression);
assertEquals("b", expression.getValue());
boolean root = true;
expression = parser.parseExpression("(#root and true)?T(Integer).valueOf(1):T(Long).valueOf(3L)");
assertEquals(1, expression.getValue(root));
assertCantCompile(expression); // Have not gone down false branch
root = false;
assertEquals(3L, expression.getValue(root));
assertCanCompile(expression);
assertEquals(3L, expression.getValue(root));
root = true;
assertEquals(1, expression.getValue(root));
}
@Test
public void ternaryWithBooleanReturn_SPR12271() {
expression = parser.parseExpression("T(Boolean).TRUE?'abc':'def'");
assertEquals("abc", expression.getValue());
assertCanCompile(expression);
assertEquals("abc", expression.getValue());
expression = parser.parseExpression("T(Boolean).FALSE?'abc':'def'");
assertEquals("def", expression.getValue());
assertCanCompile(expression);
assertEquals("def", expression.getValue());
}
@Test
public void nullsafeFieldPropertyDereferencing_SPR16489() throws Exception {
FooObjectHolder foh = new FooObjectHolder();
StandardEvaluationContext context = new StandardEvaluationContext();
context.setRootObject(foh);
// First non compiled:
SpelExpression expression = (SpelExpression) parser.parseExpression("foo?.object");
assertEquals("hello",expression.getValue(context));
foh.foo = null;
assertNull(expression.getValue(context));
// Now revert state of foh and try compiling it:
foh.foo = new FooObject();
assertEquals("hello",expression.getValue(context));
assertCanCompile(expression);
assertEquals("hello",expression.getValue(context));
foh.foo = null;
assertNull(expression.getValue(context));
// Static references
expression = (SpelExpression) parser.parseExpression("#var?.propertya");
context.setVariable("var", StaticsHelper.class);
assertEquals("sh",expression.getValue(context).toString());
context.setVariable("var", null);
assertNull(expression.getValue(context));
assertCanCompile(expression);
context.setVariable("var", StaticsHelper.class);
assertEquals("sh",expression.getValue(context).toString());
context.setVariable("var", null);
assertNull(expression.getValue(context));
// Single size primitive (boolean)
expression = (SpelExpression) parser.parseExpression("#var?.a");
context.setVariable("var", new TestClass4());
assertFalse((Boolean)expression.getValue(context));
context.setVariable("var", null);
assertNull(expression.getValue(context));
assertCanCompile(expression);
context.setVariable("var", new TestClass4());
assertFalse((Boolean)expression.getValue(context));
context.setVariable("var", null);
assertNull(expression.getValue(context));
// Double slot primitives
expression = (SpelExpression) parser.parseExpression("#var?.four");
context.setVariable("var", new Three());
assertEquals("0.04",expression.getValue(context).toString());
context.setVariable("var", null);
assertNull(expression.getValue(context));
assertCanCompile(expression);
context.setVariable("var", new Three());
assertEquals("0.04",expression.getValue(context).toString());
context.setVariable("var", null);
assertNull(expression.getValue(context));
}
@Test
public void nullsafeMethodChaining_SPR16489() throws Exception {
FooObjectHolder foh = new FooObjectHolder();
StandardEvaluationContext context = new StandardEvaluationContext();
context.setRootObject(foh);
// First non compiled:
SpelExpression expression = (SpelExpression) parser.parseExpression("getFoo()?.getObject()");
assertEquals("hello",expression.getValue(context));
foh.foo = null;
assertNull(expression.getValue(context));
assertCanCompile(expression);
foh.foo = new FooObject();
assertEquals("hello",expression.getValue(context));
foh.foo = null;
assertNull(expression.getValue(context));
// Static method references
expression = (SpelExpression) parser.parseExpression("#var?.methoda()");
context.setVariable("var", StaticsHelper.class);
assertEquals("sh",expression.getValue(context).toString());
context.setVariable("var", null);
assertNull(expression.getValue(context));
assertCanCompile(expression);
context.setVariable("var", StaticsHelper.class);
assertEquals("sh",expression.getValue(context).toString());
context.setVariable("var", null);
assertNull(expression.getValue(context));
// Nullsafe guard on expression element evaluating to primitive/null
expression = (SpelExpression) parser.parseExpression("#var?.intValue()");
context.setVariable("var", 4);
assertEquals("4",expression.getValue(context).toString());
context.setVariable("var", null);
assertNull(expression.getValue(context));
assertCanCompile(expression);
context.setVariable("var", 4);
assertEquals("4",expression.getValue(context).toString());
context.setVariable("var", null);
assertNull(expression.getValue(context));
// Nullsafe guard on expression element evaluating to primitive/null
expression = (SpelExpression) parser.parseExpression("#var?.booleanValue()");
context.setVariable("var", false);
assertEquals("false",expression.getValue(context).toString());
context.setVariable("var", null);
assertNull(expression.getValue(context));
assertCanCompile(expression);
context.setVariable("var", false);
assertEquals("false",expression.getValue(context).toString());
context.setVariable("var", null);
assertNull(expression.getValue(context));
// Nullsafe guard on expression element evaluating to primitive/null
expression = (SpelExpression) parser.parseExpression("#var?.booleanValue()");
context.setVariable("var", true);
assertEquals("true",expression.getValue(context).toString());
context.setVariable("var", null);
assertNull(expression.getValue(context));
assertCanCompile(expression);
context.setVariable("var", true);
assertEquals("true",expression.getValue(context).toString());
context.setVariable("var", null);
assertNull(expression.getValue(context));
// Nullsafe guard on expression element evaluating to primitive/null
expression = (SpelExpression) parser.parseExpression("#var?.longValue()");
context.setVariable("var", 5L);
assertEquals("5",expression.getValue(context).toString());
context.setVariable("var", null);
assertNull(expression.getValue(context));
assertCanCompile(expression);
context.setVariable("var", 5L);
assertEquals("5",expression.getValue(context).toString());
context.setVariable("var", null);
assertNull(expression.getValue(context));
// Nullsafe guard on expression element evaluating to primitive/null
expression = (SpelExpression) parser.parseExpression("#var?.floatValue()");
context.setVariable("var", 3f);
assertEquals("3.0",expression.getValue(context).toString());
context.setVariable("var", null);
assertNull(expression.getValue(context));
assertCanCompile(expression);
context.setVariable("var", 3f);
assertEquals("3.0",expression.getValue(context).toString());
context.setVariable("var", null);
assertNull(expression.getValue(context));
// Nullsafe guard on expression element evaluating to primitive/null
expression = (SpelExpression) parser.parseExpression("#var?.shortValue()");
context.setVariable("var", (short)8);
assertEquals("8",expression.getValue(context).toString());
context.setVariable("var", null);
assertNull(expression.getValue(context));
assertCanCompile(expression);
context.setVariable("var", (short)8);
assertEquals("8",expression.getValue(context).toString());
context.setVariable("var", null);
assertNull(expression.getValue(context));
}
@Test
public void elvis() throws Exception {
Expression expression = parser.parseExpression("'a'?:'b'");
String resultI = expression.getValue(String.class);
assertCanCompile(expression);
String resultC = expression.getValue(String.class);
assertEquals("a", resultI);
assertEquals("a", resultC);
expression = parser.parseExpression("null?:'a'");
resultI = expression.getValue(String.class);
assertCanCompile(expression);
resultC = expression.getValue(String.class);
assertEquals("a", resultI);
assertEquals("a", resultC);
String s = "abc";
expression = parser.parseExpression("#root?:'b'");
assertCantCompile(expression);
resultI = expression.getValue(s, String.class);
assertEquals("abc", resultI);
assertCanCompile(expression);
}
@Test
public void variableReference_root() throws Exception {
String s = "hello";
Expression expression = parser.parseExpression("#root");
String resultI = expression.getValue(s, String.class);
assertCanCompile(expression);
String resultC = expression.getValue(s, String.class);
assertEquals(s, resultI);
assertEquals(s, resultC);
expression = parser.parseExpression("#root");
int i = (Integer) expression.getValue(42);
assertEquals(42,i);
assertCanCompile(expression);
i = (Integer) expression.getValue(42);
assertEquals(42,i);
}
public static String concat(String a, String b) {
return a+b;
}
public static String join(String...strings) {
StringBuilder buf = new StringBuilder();
for (String string: strings) {
buf.append(string);
}
return buf.toString();
}
@Test
public void compiledExpressionShouldWorkWhenUsingCustomFunctionWithVarargs() throws Exception {
StandardEvaluationContext context = null;
// Here the target method takes Object... and we are passing a string
expression = parser.parseExpression("#doFormat('hey %s', 'there')");
context = new StandardEvaluationContext();
context.registerFunction("doFormat",
DelegatingStringFormat.class.getDeclaredMethod("format", String.class, Object[].class));
((SpelExpression) expression).setEvaluationContext(context);
assertEquals("hey there", expression.getValue(String.class));
assertTrue(((SpelNodeImpl) ((SpelExpression) expression).getAST()).isCompilable());
assertCanCompile(expression);
assertEquals("hey there", expression.getValue(String.class));
expression = parser.parseExpression("#doFormat([0], 'there')");
context = new StandardEvaluationContext(new Object[] {"hey %s"});
context.registerFunction("doFormat",
DelegatingStringFormat.class.getDeclaredMethod("format", String.class, Object[].class));
((SpelExpression) expression).setEvaluationContext(context);
assertEquals("hey there", expression.getValue(String.class));
assertTrue(((SpelNodeImpl) ((SpelExpression) expression).getAST()).isCompilable());
assertCanCompile(expression);
assertEquals("hey there", expression.getValue(String.class));
expression = parser.parseExpression("#doFormat([0], #arg)");
context = new StandardEvaluationContext(new Object[] {"hey %s"});
context.registerFunction("doFormat",
DelegatingStringFormat.class.getDeclaredMethod("format", String.class, Object[].class));
context.setVariable("arg", "there");
((SpelExpression) expression).setEvaluationContext(context);
assertEquals("hey there", expression.getValue(String.class));
assertTrue(((SpelNodeImpl) ((SpelExpression) expression).getAST()).isCompilable());
assertCanCompile(expression);
assertEquals("hey there", expression.getValue(String.class));
}
@Test
public void functionReference() throws Exception {
EvaluationContext ctx = new StandardEvaluationContext();
Method m = getClass().getDeclaredMethod("concat", String.class, String.class);
ctx.setVariable("concat",m);
expression = parser.parseExpression("#concat('a','b')");
assertEquals("ab", expression.getValue(ctx));
assertCanCompile(expression);
assertEquals("ab", expression.getValue(ctx));
expression = parser.parseExpression("#concat(#concat('a','b'),'c').charAt(1)");
assertEquals('b', expression.getValue(ctx));
assertCanCompile(expression);
assertEquals('b', expression.getValue(ctx));
expression = parser.parseExpression("#concat(#a,#b)");
ctx.setVariable("a", "foo");
ctx.setVariable("b", "bar");
assertEquals("foobar", expression.getValue(ctx));
assertCanCompile(expression);
assertEquals("foobar", expression.getValue(ctx));
ctx.setVariable("b", "boo");
assertEquals("fooboo", expression.getValue(ctx));
m = Math.class.getDeclaredMethod("pow", Double.TYPE, Double.TYPE);
ctx.setVariable("kapow",m);
expression = parser.parseExpression("#kapow(2.0d,2.0d)");
assertEquals("4.0", expression.getValue(ctx).toString());
assertCanCompile(expression);
assertEquals("4.0", expression.getValue(ctx).toString());
}
@Test
public void functionReferenceVisibility_SPR12359() throws Exception {
// Confirms visibility of what is being called.
StandardEvaluationContext context = new StandardEvaluationContext(new Object[] {"1"});
context.registerFunction("doCompare", SomeCompareMethod.class.getDeclaredMethod(
"compare", Object.class, Object.class));
context.setVariable("arg", "2");
// type nor method are public