org.zalando.riptide.DefaultMessageReader Maven / Gradle / Ivy

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package org.zalando.riptide;

/*
 * ⁣
 * Riptide
 * ⁣⁣
 * Copyright (C) 2015 - 2016 Zalando SE
 * ⁣⁣
 * 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.
 * ⁣
 */

import com.google.common.reflect.TypeToken;
import org.springframework.http.client.ClientHttpResponse;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.web.client.HttpMessageConverterExtractor;
import org.springframework.web.client.ResponseExtractor;

import java.io.IOException;
import java.util.List;

final class DefaultMessageReader implements MessageReader {

    private final List> converters;

    DefaultMessageReader(final List> converters) {
        this.converters = converters;
    }

    @Override
    public  I read(final TypeToken type, final ClientHttpResponse response) throws IOException {
        if (type.isSubtypeOf(ClientHttpResponse.class)) {
            return cast(response);
        }

        final ResponseExtractor extractor = new HttpMessageConverterExtractor<>(type.getType(), converters);
        final I data = extractor.extractData(response);

        if (data instanceof AutoCloseable) {
            return data;
        }

        response.close();
        return data;
    }

    @SuppressWarnings("unchecked")
    private  I cast(final ClientHttpResponse response) {
        return (I) response;
    }

}