spring AllEncompassingFormHttpMessageConverter 源码

spring AllEncompassingFormHttpMessageConverter 代码

文件路径：/spring-web/src/main/java/org/springframework/http/converter/support/AllEncompassingFormHttpMessageConverter.java

/*
 * Copyright 2002-2020 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.core.SpringProperties;
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.KotlinSerializationJsonHttpMessageConverter;
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
 * @author Sebastien Deleuze
 * @since 3.2
 */
public class AllEncompassingFormHttpMessageConverter extends FormHttpMessageConverter {

	/**
	 * Boolean flag controlled by a {@code spring.xml.ignore} system property that instructs Spring to
	 * ignore XML, i.e. to not initialize the XML-related infrastructure.
	 * <p>The default is "false".
	 */
	private static final boolean shouldIgnoreXml = SpringProperties.getFlag("spring.xml.ignore");

	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;

	private static final boolean kotlinSerializationJsonPresent;

	static {
		ClassLoader classLoader = AllEncompassingFormHttpMessageConverter.class.getClassLoader();
		jaxb2Present = ClassUtils.isPresent("jakarta.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("jakarta.json.bind.Jsonb", classLoader);
		kotlinSerializationJsonPresent = ClassUtils.isPresent("kotlinx.serialization.json.Json", classLoader);
	}


	public AllEncompassingFormHttpMessageConverter() {
		if (!shouldIgnoreXml) {
			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());
		}
		else if (kotlinSerializationJsonPresent) {
			addPartConverter(new KotlinSerializationJsonHttpMessageConverter());
		}

		if (jackson2XmlPresent && !shouldIgnoreXml) {
			addPartConverter(new MappingJackson2XmlHttpMessageConverter());
		}

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

}

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