org.springframework.web.accept.FixedContentNegotiationStrategy.java Source code

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Here is the source code for org.springframework.web.accept.FixedContentNegotiationStrategy.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.web.accept;

import java.util.Collections;
import java.util.List;

import org.springframework.http.MediaType;
import org.springframework.util.Assert;
import org.springframework.web.context.request.NativeWebRequest;

/**
 * A {@code ContentNegotiationStrategy} that returns a fixed content type.
 *
 * @author Rossen Stoyanchev
 * @since 3.2
 */
public class FixedContentNegotiationStrategy implements ContentNegotiationStrategy {

    private final List<MediaType> contentTypes;

    /**
     * Constructor with a single default {@code MediaType}.
     */
    public FixedContentNegotiationStrategy(MediaType contentType) {
        this(Collections.singletonList(contentType));
    }

    /**
     * Constructor with an ordered List of default {@code MediaType}'s to return
     * for use in applications that support a variety of content types.
     * <p>Consider appending {@link MediaType#ALL} at the end if destinations
     * are present which do not support any of the other default media types.
     * @since 5.0
     */
    public FixedContentNegotiationStrategy(List<MediaType> contentTypes) {
        Assert.notNull(contentTypes, "'contentTypes' must not be null");
        this.contentTypes = Collections.unmodifiableList(contentTypes);
    }

    /**
     * Return the configured list of media types.
     */
    public List<MediaType> getContentTypes() {
        return this.contentTypes;
    }

    @Override
    public List<MediaType> resolveMediaTypes(NativeWebRequest request) {
        return this.contentTypes;
    }

}