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/*
* Copyright (c) 2011, 2023, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* @test
* @bug 4884238 8310047
* @summary Test standard charset name constants and class qualities.
* @author Mike Duigou
* @run junit Standard
*/
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Stream;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.Arguments;
import org.junit.jupiter.params.provider.MethodSource;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertTrue;
public class Standard {
// These are the charsets StandardCharsets.java is expected to contain.
private static final String[] expectedCharsets = {
"US-ASCII", "ISO-8859-1", "UTF-8",
"UTF-16BE", "UTF-16LE", "UTF-16"
};
private static final Field[] standardCharsetFields =
StandardCharsets.class.getFields();
/**
* Validates that the Charset constants from the data provider
* are of type Charset.
*/
@ParameterizedTest
@MethodSource("charsetProvider")
public void typeTest(Charset charset) {
// Doubly checked, as it is validated when passed as a param
assertTrue(charset instanceof Charset);
}
/**
* Validates that calling .name() on a Charset constant is equal
* to the matching String value from the data provider.
*/
@ParameterizedTest
@MethodSource("charsetProvider")
public void nameMethodTest(Charset charset, String charString) {
assertEquals(charset.name(), charString);
}
/**
* Validates that calling Charset.forName() on a String is equal
* to the matching Charset constant from the data provider.
*/
@ParameterizedTest
@MethodSource("charsetProvider")
public void forNameMethodTest(Charset charset, String charString) {
assertEquals(Charset.forName(charString), charset);
}
/**
* Validates the qualities of a StandardCharsets field are as expected:
* The field is final, static, public, and one can access
* the underlying value of the field.
*/
@ParameterizedTest
@MethodSource("charsetFields")
public void charsetModifiersTest(Field charsetField) throws IllegalAccessException {
// Check modifiers
assertEquals(StandardCharsets.class, charsetField.getDeclaringClass());
assertTrue(Modifier.isFinal(charsetField.getModifiers()));
assertTrue(Modifier.isStatic(charsetField.getModifiers()));
assertTrue(Modifier.isPublic(charsetField.getModifiers()));
// Check that the value can be accessed, and it is a Charset
Object valueOfField = charsetField.get(null);
assertTrue(valueOfField instanceof Charset);
}
/**
* Validates that the Charsets contained in StandardCharsets are equal
* to the expected Charsets list defined in the test. This test should fail if
* either the actual or expected (standard) Charsets are modified, and
* the others are not.
*/
@Test
public void correctCharsetsTest() {
// Grab the value from each Standard Charset field
List<String> actualCharsets = charsetFields().map(field -> {
try {
return ((Charset) field.get(null)).name();
} catch (IllegalAccessException e) {
throw new RuntimeException("Can not test correctCharsetsTest() due to %s", e);
}
}).toList();
assertEquals(actualCharsets, Arrays.asList(expectedCharsets));
}
/**
* Provides the constant Charset and associated String value of
* the standard charsets.
*/
private static Stream<Arguments> charsetProvider() {
return Stream.of(
Arguments.of(StandardCharsets.US_ASCII, "US-ASCII"),
Arguments.of(StandardCharsets.ISO_8859_1, "ISO-8859-1"),
Arguments.of(StandardCharsets.UTF_8, "UTF-8"),
Arguments.of(StandardCharsets.UTF_16BE, "UTF-16BE"),
Arguments.of(StandardCharsets.UTF_16LE, "UTF-16LE"),
Arguments.of(StandardCharsets.UTF_16, "UTF-16")
);
}
private static Stream<Field> charsetFields() {
return Arrays.stream(standardCharsetFields);
}
}
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