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VariableAndFunctionTests.java
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VariableAndFunctionTests.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 org.junit.jupiter.api.Test;
import org.springframework.expression.spel.standard.SpelExpressionParser;
import org.springframework.expression.spel.support.StandardEvaluationContext;
import static org.assertj.core.api.Assertions.assertThat;
import static org.assertj.core.api.Assertions.assertThatExceptionOfType;
/**
* Tests the evaluation of expressions that access variables and functions (lambda/java).
*
* @author Andy Clement
*/
public class VariableAndFunctionTests extends AbstractExpressionTests {
@Test
public void testVariableAccess01() {
evaluate("#answer", "42", Integer.class, SHOULD_BE_WRITABLE);
evaluate("#answer / 2", 21, Integer.class, SHOULD_NOT_BE_WRITABLE);
}
@Test
public void testVariableAccess_WellKnownVariables() {
evaluate("#this.getName()","Nikola Tesla",String.class);
evaluate("#root.getName()","Nikola Tesla",String.class);
}
@Test
public void testFunctionAccess01() {
evaluate("#reverseInt(1,2,3)", "int[3]{3,2,1}", int[].class);
evaluate("#reverseInt('1',2,3)", "int[3]{3,2,1}", int[].class); // requires type conversion of '1' to 1
evaluateAndCheckError("#reverseInt(1)", SpelMessage.INCORRECT_NUMBER_OF_ARGUMENTS_TO_FUNCTION, 0, 1, 3);
}
@Test
public void testFunctionAccess02() {
evaluate("#reverseString('hello')", "olleh", String.class);
evaluate("#reverseString(37)", "73", String.class); // requires type conversion of 37 to '37'
}
@Test
public void testCallVarargsFunction() {
evaluate("#varargsFunction()", "[]", String.class);
evaluate("#varargsFunction(new String[0])", "[]", String.class);
evaluate("#varargsFunction('a','b','c')", "[a, b, c]", String.class);
evaluate("#varargsFunction('a')", "[a]", String.class);
evaluate("#varargsFunction('b',25)", "[b, 25]", String.class);
evaluate("#varargsFunction(25)", "[25]", String.class);
evaluate("#varargsFunction(null)", "[null]", String.class);
evaluate("#varargsFunction('a',null,'b')", "[a, null, b]", String.class);
evaluate("#varargsFunction2(9)", "9-[]", String.class);
evaluate("#varargsFunction2(9, new String[0])", "9-[]", String.class);
evaluate("#varargsFunction2(9,'a','b','c')", "9-[a, b, c]", String.class);
evaluate("#varargsFunction2(9,'a')", "9-[a]", String.class);
evaluate("#varargsFunction2(9,'b',25)", "9-[b, 25]", String.class);
evaluate("#varargsFunction2(9,25)", "9-[25]", String.class);
evaluate("#varargsFunction2(9,null)", "9-[null]", String.class);
evaluate("#varargsFunction2(9,'a',null,'b')", "9-[a, null, b]", String.class);
}
@Test
public void testCallingIllegalFunctions() throws Exception {
SpelExpressionParser parser = new SpelExpressionParser();
StandardEvaluationContext ctx = new StandardEvaluationContext();
ctx.setVariable("notStatic", this.getClass().getMethod("nonStatic"));
assertThatExceptionOfType(SpelEvaluationException.class).isThrownBy(() ->
parser.parseRaw("#notStatic()").getValue(ctx)).
satisfies(ex -> assertThat(ex.getMessageCode()).isEqualTo(SpelMessage.FUNCTION_MUST_BE_STATIC));
}
// this method is used by the test above
public void nonStatic() {
}
}