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UtilTest.java
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/*
* Copyright 2013 Netflix, 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 feign;
import feign.codec.Decoder;
import feign.codec.Decoders;
import feign.codec.StringDecoder;
import org.testng.annotations.Test;
import java.io.Reader;
import java.lang.reflect.Type;
import java.util.List;
import static feign.Util.resolveLastTypeParameter;
import static org.testng.Assert.assertEquals;
@Test
public class UtilTest {
interface LastTypeParameter {
final List<String> LIST_STRING = null;
final Decoder.TextStream<List<String>> DECODER_LIST_STRING = null;
final Decoder.TextStream<? extends List<String>> DECODER_WILDCARD_LIST_STRING = null;
final ParameterizedDecoder<List<String>> PARAMETERIZED_DECODER_LIST_STRING = null;
final ParameterizedDecoder<?> PARAMETERIZED_DECODER_UNBOUND = null;
}
interface ParameterizedDecoder<T extends List<String>> extends Decoder.TextStream<T> {
}
@Test public void resolveLastTypeParameterWhenNotSubtype() throws Exception {
Type context = LastTypeParameter.class.getDeclaredField("DECODER_LIST_STRING").getGenericType();
Type listStringType = LastTypeParameter.class.getDeclaredField("LIST_STRING").getGenericType();
Type last = resolveLastTypeParameter(context, Decoder.class);
assertEquals(last, listStringType);
}
@Test public void lastTypeFromInstance() throws Exception {
Decoder.TextStream<?> decoder = new StringDecoder();
Type last = resolveLastTypeParameter(decoder.getClass(), Decoder.class);
assertEquals(last, String.class);
}
@Test public void lastTypeFromStaticMethod() throws Exception {
Decoder.TextStream<?> decoder = Decoders.firstGroup("foo");
Type last = resolveLastTypeParameter(decoder.getClass(), Decoder.class);
assertEquals(last, String.class);
}
@Test public void lastTypeFromAnonymous() throws Exception {
Decoder.TextStream<?> decoder = new Decoder.TextStream<Reader>() {
@Override public Reader decode(Reader reader, Type type) {
return null;
}
};
Type last = resolveLastTypeParameter(decoder.getClass(), Decoder.class);
assertEquals(last, Reader.class);
}
@Test public void resolveLastTypeParameterWhenWildcard() throws Exception {
Type context = LastTypeParameter.class.getDeclaredField("DECODER_WILDCARD_LIST_STRING").getGenericType();
Type listStringType = LastTypeParameter.class.getDeclaredField("LIST_STRING").getGenericType();
Type last = resolveLastTypeParameter(context, Decoder.class);
assertEquals(last, listStringType);
}
@Test public void resolveLastTypeParameterWhenParameterizedSubtype() throws Exception {
Type context = LastTypeParameter.class.getDeclaredField("PARAMETERIZED_DECODER_LIST_STRING").getGenericType();
Type listStringType = LastTypeParameter.class.getDeclaredField("LIST_STRING").getGenericType();
Type last = resolveLastTypeParameter(context, ParameterizedDecoder.class);
assertEquals(last, listStringType);
}
@Test public void unboundWildcardIsObject() throws Exception {
Type context = LastTypeParameter.class.getDeclaredField("PARAMETERIZED_DECODER_UNBOUND").getGenericType();
Type last = resolveLastTypeParameter(context, ParameterizedDecoder.class);
assertEquals(last, Object.class);
}
}