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/*
* Copyright (C) 2019 Google, Inc.
*
* 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 com.google.escapevelocity;
import static com.google.common.truth.Truth.assertThat;
import static java.util.stream.Collectors.toSet;
import com.google.common.collect.ImmutableMap;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
@RunWith(JUnit4.class)
public class MethodFinderTest {
@Test
public void visibleMethodFromClass() throws Exception {
Map<String, String> map = Collections.singletonMap("foo", "bar");
Class<?> mapClass = map.getClass();
assertThat(Modifier.isPublic(mapClass.getModifiers())).isFalse();
Method size = mapClass.getMethod("size");
Method visibleSize = MethodFinder.visibleMethod(size, mapClass);
assertThat(visibleSize.getDeclaringClass().isInterface()).isFalse();
assertThat(visibleSize.invoke(map)).isEqualTo(1);
}
@Test
public void visibleMethodFromInterface() throws Exception {
Map<String, String> map = ImmutableMap.of("foo", "bar");
Map.Entry<String, String> entry = map.entrySet().iterator().next();
Class<?> entryClass = entry.getClass();
assertThat(Modifier.isPublic(entryClass.getModifiers())).isFalse();
Method getValue = entryClass.getMethod("getValue");
Method visibleGetValue = MethodFinder.visibleMethod(getValue, entryClass);
assertThat(visibleGetValue.getDeclaringClass().isInterface()).isTrue();
assertThat(visibleGetValue.invoke(entry)).isEqualTo("bar");
}
@Test
public void publicMethodsWithName() {
List<String> list = Collections.singletonList("foo");
Class<?> listClass = list.getClass();
assertThat(Modifier.isPublic(listClass.getModifiers())).isFalse();
MethodFinder methodFinder = new MethodFinder();
Set<Method> methods = methodFinder.publicMethodsWithName(listClass, "remove");
// This should find at least remove(int) and remove(Object).
assertThat(methods.size()).isAtLeast(2);
assertThat(methods.stream().map(Method::getName).collect(toSet())).containsExactly("remove");
assertThat(methods.stream().allMatch(MethodFinderTest::isPublic)).isTrue();
// We should cache the result, meaning we get back the same result if we ask a second time.
Set<Method> methods2 = methodFinder.publicMethodsWithName(listClass, "remove");
assertThat(methods2).isSameInstanceAs(methods);
}
@Test
public void publicMethodsWithName_Nonexistent() {
List<String> list = Collections.singletonList("foo");
Class<?> listClass = list.getClass();
assertThat(Modifier.isPublic(listClass.getModifiers())).isFalse();
MethodFinder methodFinder = new MethodFinder();
Set<Method> methods = methodFinder.publicMethodsWithName(listClass, "nonexistentMethod");
assertThat(methods).isEmpty();
}
private static boolean isPublic(Method method) {
return Modifier.isPublic(method.getModifiers())
&& Modifier.isPublic(method.getDeclaringClass().getModifiers());
}
}
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