org.springframework.http.converter.support.AllEncompassingFormHttpMessageConverter.java Source code

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Here is the source code for org.springframework.http.converter.support.AllEncompassingFormHttpMessageConverter.java

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/*
 * Copyright 2002-2018 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.http.converter.support;

import org.springframework.http.converter.FormHttpMessageConverter;
import org.springframework.http.converter.json.GsonHttpMessageConverter;
import org.springframework.http.converter.json.JsonbHttpMessageConverter;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
import org.springframework.http.converter.smile.MappingJackson2SmileHttpMessageConverter;
import org.springframework.http.converter.xml.Jaxb2RootElementHttpMessageConverter;
import org.springframework.http.converter.xml.MappingJackson2XmlHttpMessageConverter;
import org.springframework.http.converter.xml.SourceHttpMessageConverter;
import org.springframework.util.ClassUtils;

/**
 * Extension of {@link org.springframework.http.converter.FormHttpMessageConverter},
 * adding support for XML and JSON-based parts.
 *
 * @author Rossen Stoyanchev
 * @author Juergen Hoeller
 * @since 3.2
 */
public class AllEncompassingFormHttpMessageConverter extends FormHttpMessageConverter {

    private static final boolean jaxb2Present;

    private static final boolean jackson2Present;

    private static final boolean jackson2XmlPresent;

    private static final boolean jackson2SmilePresent;

    private static final boolean gsonPresent;

    private static final boolean jsonbPresent;

    static {
        ClassLoader classLoader = AllEncompassingFormHttpMessageConverter.class.getClassLoader();
        jaxb2Present = ClassUtils.isPresent("javax.xml.bind.Binder", classLoader);
        jackson2Present = ClassUtils.isPresent("com.fasterxml.jackson.databind.ObjectMapper", classLoader)
                && ClassUtils.isPresent("com.fasterxml.jackson.core.JsonGenerator", classLoader);
        jackson2XmlPresent = ClassUtils.isPresent("com.fasterxml.jackson.dataformat.xml.XmlMapper", classLoader);
        jackson2SmilePresent = ClassUtils.isPresent("com.fasterxml.jackson.dataformat.smile.SmileFactory",
                classLoader);
        gsonPresent = ClassUtils.isPresent("com.google.gson.Gson", classLoader);
        jsonbPresent = ClassUtils.isPresent("javax.json.bind.Jsonb", classLoader);
    }

    public AllEncompassingFormHttpMessageConverter() {
        try {
            addPartConverter(new SourceHttpMessageConverter<>());
        } catch (Error err) {
            // Ignore when no TransformerFactory implementation is available
        }

        if (jaxb2Present && !jackson2XmlPresent) {
            addPartConverter(new Jaxb2RootElementHttpMessageConverter());
        }

        if (jackson2Present) {
            addPartConverter(new MappingJackson2HttpMessageConverter());
        } else if (gsonPresent) {
            addPartConverter(new GsonHttpMessageConverter());
        } else if (jsonbPresent) {
            addPartConverter(new JsonbHttpMessageConverter());
        }

        if (jackson2XmlPresent) {
            addPartConverter(new MappingJackson2XmlHttpMessageConverter());
        }

        if (jackson2SmilePresent) {
            addPartConverter(new MappingJackson2SmileHttpMessageConverter());
        }
    }

}