Add Google Protobuf support with a MessageConverter
This change adds a new HttpMessageConverter supporting Google protocol buffers (aka Protobuf). This message converter supports the following media types: * application/json * application/xml * text/plain * text/html (output only) * and by default application/x-protobuf Note, in order to generate Proto Message classes, the protoc binary must be available on your system. Issue: SPR-5807/SPR-6259
This commit is contained in:
Brian Clozel
Rossen Stoyanchev
parent
105ea196e4
commit
b56703eadc
19
build.gradle
19
build.gradle
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@ -6,6 +6,7 @@ buildscript {
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classpath("org.springframework.build.gradle:propdeps-plugin:0.0.7")
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classpath("org.asciidoctor:asciidoctor-gradle-plugin:0.7.0")
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classpath("org.springframework.build.gradle:docbook-reference-plugin:0.2.8")
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classpath("ws.antonov.gradle.plugins:gradle-plugin-protobuf:0.9.1")
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}
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}
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@ -37,6 +38,7 @@ configure(allprojects) { project ->
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ext.tiles3Version = "3.0.4"
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ext.tomcatVersion = "8.0.9"
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ext.xstreamVersion = "1.4.7"
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ext.protobufVersion = "2.5.0"
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ext.gradleScriptDir = "${rootProject.projectDir}/gradle"
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@ -611,6 +613,21 @@ project("spring-web") {
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description = "Spring Web"
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apply plugin: "groovy"
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// Re-generate Protobuf classes from *.proto files and move them in test sources
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if (project.hasProperty('genProtobuf')) {
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apply plugin: 'protobuf'
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task updateGenProtobuf(type:Copy, dependsOn: ":spring-web:generateTestProto") {
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from "${project.buildDir}/generated-sources/test/"
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into "${projectDir}/src/test/java"
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doLast {
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project.delete "${project.buildDir}/generated-sources/test"
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}
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}
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tasks.getByPath("compileTestJava").dependsOn "updateGenProtobuf"
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}
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dependencies {
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compile(project(":spring-aop")) // for JaxWsPortProxyFactoryBean
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compile(project(":spring-beans")) // for MultiPartFilter
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@ -638,6 +655,8 @@ project("spring-web") {
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exclude group: "javax.servlet", module: "javax.servlet-api"
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}
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optional("log4j:log4j:1.2.17")
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optional("com.googlecode.protobuf-java-format:protobuf-java-format:1.2")
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optional("com.google.protobuf:protobuf-java:${protobufVersion}")
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testCompile(project(":spring-context-support")) // for JafMediaTypeFactory
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testCompile("xmlunit:xmlunit:1.5")
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testCompile("org.slf4j:slf4j-jcl:${slf4jVersion}")
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@ -0,0 +1,40 @@
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/*
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* Copyright 2002-2014 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.springframework.http.converter.protobuf;
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import com.google.protobuf.ExtensionRegistry;
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/**
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* Google Protocol Messages can contain message extensions that can be parsed if
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* the appropriate configuration has been registered in the {@code ExtensionRegistry}.
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*
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* This interface provides a facility to populate the {@code ExtensionRegistry}.
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*
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* @author Alex Antonov
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* @since 4.1
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* @see <a href="https://developers.google.com/protocol-buffers/docs/reference/java/com/google/protobuf/ExtensionRegistry">
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* com.google.protobuf.ExtensionRegistry</a>
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*/
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public interface ExtensionRegistryInitializer {
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/**
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* Initializes the {@code ExtensionRegistry} with Protocol Message extensions
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* @param registry the registry to populate
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*/
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void initializeExtensionRegistry(ExtensionRegistry registry);
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}
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@ -0,0 +1,204 @@
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/*
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* Copyright 2002-2014 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.springframework.http.converter.protobuf;
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import java.io.IOException;
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import java.io.InputStreamReader;
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import java.io.OutputStreamWriter;
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import java.io.StringWriter;
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import java.io.UnsupportedEncodingException;
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import java.lang.reflect.Method;
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import java.nio.charset.Charset;
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import java.util.concurrent.ConcurrentHashMap;
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import com.google.protobuf.ExtensionRegistry;
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import com.google.protobuf.Message;
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import com.google.protobuf.TextFormat;
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import com.googlecode.protobuf.format.HtmlFormat;
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import com.googlecode.protobuf.format.JsonFormat;
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import com.googlecode.protobuf.format.XmlFormat;
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import org.springframework.http.HttpHeaders;
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import org.springframework.http.HttpInputMessage;
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import org.springframework.http.HttpOutputMessage;
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import org.springframework.http.MediaType;
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import org.springframework.http.converter.AbstractHttpMessageConverter;
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import org.springframework.http.converter.HttpMessageNotReadableException;
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import org.springframework.http.converter.HttpMessageNotWritableException;
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import org.springframework.util.Assert;
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import org.springframework.util.FileCopyUtils;
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/**
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* Implementation of {@link org.springframework.http.converter.HttpMessageConverter}
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* that can read and write Protobuf {@code Message}s using the
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* <a href="https://developers.google.com/protocol-buffers/">Google Protocol buffers</a> library.
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*
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* <p>By default, it supports {@code application/json}, {@code application/xml}, {@code text/plain}
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* and {@code application/x-protobuf}. {@code text/html} is only supported when writing messages.
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*
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* <p>In order to generate Message Java classes, you should install the protoc binary on your system.
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* <p>Tested against Protobuf version 2.5.0.
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*
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* @author Alex Antonov
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* @author Brian Clozel
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* @since 4.1
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*/
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public class ProtobufHttpMessageConverter extends AbstractHttpMessageConverter<Message> {
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public static final Charset DEFAULT_CHARSET = Charset.forName("UTF-8");
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public static final MediaType PROTOBUF = new MediaType("application", "x-protobuf", DEFAULT_CHARSET);
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public static final String X_PROTOBUF_SCHEMA_HEADER = "X-Protobuf-Schema";
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public static final String X_PROTOBUF_MESSAGE_HEADER = "X-Protobuf-Message";
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private static final ConcurrentHashMap<Class<?>, Method> newBuilderMethodCache =
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new ConcurrentHashMap<Class<?>, Method>();
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private ExtensionRegistry extensionRegistry = ExtensionRegistry.newInstance();
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/**
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* Construct a new {@code ProtobufHttpMessageConverter}.
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*/
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public ProtobufHttpMessageConverter() {
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this(null);
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}
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/**
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* Construct a new {@code ProtobufHttpMessageConverter} with a {@link ExtensionRegistryInitializer},
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* allowing to register message extensions.
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*/
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public ProtobufHttpMessageConverter(ExtensionRegistryInitializer registryInitializer) {
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//TODO: should we handle "*+json", "*+xml" as well?
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super(PROTOBUF, MediaType.TEXT_PLAIN,
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MediaType.APPLICATION_XML, MediaType.APPLICATION_JSON);
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Assert.notNull(registryInitializer, "ExtensionRegistryInitializer must not be null");
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registryInitializer.initializeExtensionRegistry(extensionRegistry);
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}
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@Override
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protected boolean supports(Class<?> clazz) {
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return Message.class.isAssignableFrom(clazz);
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}
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@Override
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protected Message readInternal(Class<? extends Message> clazz, HttpInputMessage inputMessage) throws IOException, HttpMessageNotReadableException {
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MediaType contentType = inputMessage.getHeaders().getContentType();
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contentType = contentType != null ? contentType : PROTOBUF;
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InputStreamReader reader = new InputStreamReader(inputMessage.getBody(), getCharset(inputMessage.getHeaders()));
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try {
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Message.Builder builder = createMessageBuilder(clazz);
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if (MediaType.APPLICATION_JSON.isCompatibleWith(contentType)) {
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JsonFormat.merge(reader, extensionRegistry, builder);
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}
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else if (MediaType.TEXT_PLAIN.isCompatibleWith(contentType)) {
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TextFormat.merge(reader, extensionRegistry, builder);
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}
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else if (MediaType.APPLICATION_XML.isCompatibleWith(contentType)) {
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XmlFormat.merge(reader, extensionRegistry, builder);
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}
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else { // ProtobufHttpMessageConverter.PROTOBUF
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builder.mergeFrom(inputMessage.getBody(), extensionRegistry);
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}
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return builder.build();
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}
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catch (Exception e) {
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throw new HttpMessageNotReadableException("Could not read Protobuf message: " + e.getMessage(), e);
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}
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}
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private Charset getCharset(HttpHeaders headers) {
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if (headers == null || headers.getContentType() == null || headers.getContentType().getCharSet() == null) {
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return DEFAULT_CHARSET;
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}
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return headers.getContentType().getCharSet();
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}
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/**
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* Create a new {@code Message.Builder} instance for the given class.
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* <p>This method uses a ConcurrentHashMap for caching method lookups.
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*/
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private Message.Builder createMessageBuilder(Class<? extends Message> clazz) throws Exception {
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Method m = newBuilderMethodCache.get(clazz);
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if (m == null) {
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m = clazz.getMethod("newBuilder");
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newBuilderMethodCache.put(clazz, m);
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}
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return (Message.Builder) m.invoke(clazz);
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}
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/**
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* This method overrides the parent implementation, since this HttpMessageConverter
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* can also produce {@code MediaType.HTML "text/html"} ContentType.
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*/
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@Override
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protected boolean canWrite(MediaType mediaType) {
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return super.canWrite(mediaType) || MediaType.TEXT_HTML.isCompatibleWith(mediaType);
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}
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@Override
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protected void writeInternal(Message message, HttpOutputMessage outputMessage) throws IOException, HttpMessageNotWritableException {
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MediaType contentType = outputMessage.getHeaders().getContentType();
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Charset charset = getCharset(contentType);
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OutputStreamWriter writer = new OutputStreamWriter(outputMessage.getBody(), charset);
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if (MediaType.TEXT_HTML.isCompatibleWith(contentType)) {
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HtmlFormat.print(message, writer);
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}
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else if (MediaType.APPLICATION_JSON.isCompatibleWith(contentType)) {
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JsonFormat.print(message, writer);
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}
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else if (MediaType.TEXT_PLAIN.isCompatibleWith(contentType)) {
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TextFormat.print(message, writer);
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}
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else if (MediaType.APPLICATION_XML.isCompatibleWith(contentType)) {
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XmlFormat.print(message, writer);
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}
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else if (PROTOBUF.isCompatibleWith(contentType)) {
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setProtoHeader(outputMessage, message);
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FileCopyUtils.copy(message.toByteArray(), outputMessage.getBody());
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}
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}
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private Charset getCharset(MediaType contentType) {
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return contentType.getCharSet() != null ? contentType.getCharSet() : DEFAULT_CHARSET;
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}
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/**
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* Set the "X-Protobuf-*" HTTP headers when responding with
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* a message of ContentType "application/x-protobuf"
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*/
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private void setProtoHeader(final HttpOutputMessage response, final Message message) {
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response.getHeaders().set(X_PROTOBUF_SCHEMA_HEADER,
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message.getDescriptorForType().getFile().getName());
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response.getHeaders().set(X_PROTOBUF_MESSAGE_HEADER,
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message.getDescriptorForType().getFullName());
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}
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@Override
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protected MediaType getDefaultContentType(Message message) {
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return PROTOBUF;
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}
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}
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@ -0,0 +1,124 @@
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/*
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* Copyright 2002-2014 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.springframework.http.converter.protobuf;
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import java.io.IOException;
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import com.google.protobuf.Message;
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import org.junit.Before;
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import org.junit.Test;
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import org.springframework.http.MediaType;
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import org.springframework.http.MockHttpInputMessage;
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import org.springframework.http.MockHttpOutputMessage;
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import org.springframework.protobuf.Msg;
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import org.springframework.protobuf.SecondMsg;
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import static org.junit.Assert.*;
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import static org.mockito.Mockito.*;
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/**
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* Test suite for {@link ProtobufHttpMessageConverter}
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* @author Alex Antonov
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*/
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public class ProtobufHttpMessageConverterTests {
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private ProtobufHttpMessageConverter converter;
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private ExtensionRegistryInitializer registryInitializer;
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private Msg testMsg;
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@Before
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public void setUp() {
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this.registryInitializer = mock(ExtensionRegistryInitializer.class);
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this.converter = new ProtobufHttpMessageConverter(this.registryInitializer);
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this.testMsg = Msg.newBuilder().setFoo("Foo").setBlah(SecondMsg.newBuilder().setBlah(123).build()).build();
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}
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@Test
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public void extensionRegistryInitialized() {
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verify(this.registryInitializer, times(1)).initializeExtensionRegistry(anyObject());
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}
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@Test
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public void canRead() {
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assertTrue(this.converter.canRead(Msg.class, null));
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assertTrue(this.converter.canRead(Msg.class, ProtobufHttpMessageConverter.PROTOBUF));
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assertTrue(this.converter.canRead(Msg.class, MediaType.APPLICATION_JSON));
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assertTrue(this.converter.canRead(Msg.class, MediaType.APPLICATION_XML));
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assertTrue(this.converter.canRead(Msg.class, MediaType.TEXT_PLAIN));
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// only supported as an output format
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assertFalse(this.converter.canRead(Msg.class, MediaType.TEXT_HTML));
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}
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@Test
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public void canWrite() {
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assertTrue(this.converter.canWrite(Msg.class, null));
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assertTrue(this.converter.canWrite(Msg.class, ProtobufHttpMessageConverter.PROTOBUF));
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assertTrue(this.converter.canWrite(Msg.class, MediaType.APPLICATION_JSON));
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assertTrue(this.converter.canWrite(Msg.class, MediaType.APPLICATION_XML));
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assertTrue(this.converter.canWrite(Msg.class, MediaType.TEXT_PLAIN));
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assertTrue(this.converter.canWrite(Msg.class, MediaType.TEXT_HTML));
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}
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@Test
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public void read() throws IOException {
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byte[] body = this.testMsg.toByteArray();
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MockHttpInputMessage inputMessage = new MockHttpInputMessage(body);
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inputMessage.getHeaders().setContentType(ProtobufHttpMessageConverter.PROTOBUF);
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Message result = this.converter.read(Msg.class, inputMessage);
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assertEquals(this.testMsg, result);
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}
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@Test
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public void readNoContentType() throws IOException {
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byte[] body = this.testMsg.toByteArray();
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MockHttpInputMessage inputMessage = new MockHttpInputMessage(body);
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Message result = this.converter.read(Msg.class, inputMessage);
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assertEquals(this.testMsg, result);
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}
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@Test
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public void write() throws IOException {
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MockHttpOutputMessage outputMessage = new MockHttpOutputMessage();
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MediaType contentType = ProtobufHttpMessageConverter.PROTOBUF;
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this.converter.write(this.testMsg, contentType, outputMessage);
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assertEquals(contentType, outputMessage.getHeaders().getContentType());
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assertTrue(outputMessage.getBodyAsBytes().length > 0);
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Message result = Msg.parseFrom(outputMessage.getBodyAsBytes());
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assertEquals(this.testMsg, result);
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String messageHeader = outputMessage.getHeaders().getFirst(ProtobufHttpMessageConverter.X_PROTOBUF_MESSAGE_HEADER);
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assertEquals("Msg", messageHeader);
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String schemaHeader = outputMessage.getHeaders().getFirst(ProtobufHttpMessageConverter.X_PROTOBUF_SCHEMA_HEADER);
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assertEquals("sample.proto", schemaHeader);
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}
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@Test
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public void defaultContentType() throws Exception {
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assertEquals(ProtobufHttpMessageConverter.PROTOBUF, this.converter.getDefaultContentType(this.testMsg));
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}
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@Test
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public void getContentLength() throws Exception {
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MockHttpOutputMessage outputMessage = new MockHttpOutputMessage();
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MediaType contentType = ProtobufHttpMessageConverter.PROTOBUF;
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this.converter.write(this.testMsg, contentType, outputMessage);
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assertEquals(-1, outputMessage.getHeaders().getContentLength());
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}
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}
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@ -0,0 +1,636 @@
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// Generated by the protocol buffer compiler. DO NOT EDIT!
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// source: sample.proto
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package org.springframework.protobuf;
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/**
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* Protobuf type {@code Msg}
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*/
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public final class Msg extends
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com.google.protobuf.GeneratedMessage
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implements MsgOrBuilder {
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// Use Msg.newBuilder() to construct.
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private Msg(com.google.protobuf.GeneratedMessage.Builder<?> builder) {
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super(builder);
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this.unknownFields = builder.getUnknownFields();
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}
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private Msg(boolean noInit) { this.unknownFields = com.google.protobuf.UnknownFieldSet.getDefaultInstance(); }
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private static final Msg defaultInstance;
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public static Msg getDefaultInstance() {
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return defaultInstance;
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}
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public Msg getDefaultInstanceForType() {
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return defaultInstance;
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}
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private final com.google.protobuf.UnknownFieldSet unknownFields;
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@java.lang.Override
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public final com.google.protobuf.UnknownFieldSet
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getUnknownFields() {
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return this.unknownFields;
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}
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private Msg(
|
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||||
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|
||||
}
|
||||
}
|
||||
|
||||
public Builder mergeFrom(org.springframework.protobuf.SecondMsg other) {
|
||||
if (other == org.springframework.protobuf.SecondMsg.getDefaultInstance()) return this;
|
||||
if (other.hasBlah()) {
|
||||
setBlah(other.getBlah());
|
||||
}
|
||||
this.mergeUnknownFields(other.getUnknownFields());
|
||||
return this;
|
||||
}
|
||||
|
||||
public final boolean isInitialized() {
|
||||
return true;
|
||||
}
|
||||
|
||||
public Builder mergeFrom(
|
||||
com.google.protobuf.CodedInputStream input,
|
||||
com.google.protobuf.ExtensionRegistryLite extensionRegistry)
|
||||
throws java.io.IOException {
|
||||
org.springframework.protobuf.SecondMsg parsedMessage = null;
|
||||
try {
|
||||
parsedMessage = PARSER.parsePartialFrom(input, extensionRegistry);
|
||||
} catch (com.google.protobuf.InvalidProtocolBufferException e) {
|
||||
parsedMessage = (org.springframework.protobuf.SecondMsg) e.getUnfinishedMessage();
|
||||
throw e;
|
||||
} finally {
|
||||
if (parsedMessage != null) {
|
||||
mergeFrom(parsedMessage);
|
||||
}
|
||||
}
|
||||
return this;
|
||||
}
|
||||
private int bitField0_;
|
||||
|
||||
// optional int32 blah = 1;
|
||||
private int blah_ ;
|
||||
/**
|
||||
* <code>optional int32 blah = 1;</code>
|
||||
*/
|
||||
public boolean hasBlah() {
|
||||
return ((bitField0_ & 0x00000001) == 0x00000001);
|
||||
}
|
||||
/**
|
||||
* <code>optional int32 blah = 1;</code>
|
||||
*/
|
||||
public int getBlah() {
|
||||
return blah_;
|
||||
}
|
||||
/**
|
||||
* <code>optional int32 blah = 1;</code>
|
||||
*/
|
||||
public Builder setBlah(int value) {
|
||||
bitField0_ |= 0x00000001;
|
||||
blah_ = value;
|
||||
onChanged();
|
||||
return this;
|
||||
}
|
||||
/**
|
||||
* <code>optional int32 blah = 1;</code>
|
||||
*/
|
||||
public Builder clearBlah() {
|
||||
bitField0_ = (bitField0_ & ~0x00000001);
|
||||
blah_ = 0;
|
||||
onChanged();
|
||||
return this;
|
||||
}
|
||||
|
||||
// @@protoc_insertion_point(builder_scope:SecondMsg)
|
||||
}
|
||||
|
||||
static {
|
||||
defaultInstance = new SecondMsg(true);
|
||||
defaultInstance.initFields();
|
||||
}
|
||||
|
||||
// @@protoc_insertion_point(class_scope:SecondMsg)
|
||||
}
|
||||
|
||||
|
|
@ -0,0 +1,18 @@
|
|||
// Generated by the protocol buffer compiler. DO NOT EDIT!
|
||||
// source: sample.proto
|
||||
|
||||
package org.springframework.protobuf;
|
||||
|
||||
public interface SecondMsgOrBuilder
|
||||
extends com.google.protobuf.MessageOrBuilder {
|
||||
|
||||
// optional int32 blah = 1;
|
||||
/**
|
||||
* <code>optional int32 blah = 1;</code>
|
||||
*/
|
||||
boolean hasBlah();
|
||||
/**
|
||||
* <code>optional int32 blah = 1;</code>
|
||||
*/
|
||||
int getBlah();
|
||||
}
|
||||
|
|
@ -0,0 +1,12 @@
|
|||
option java_package = "org.springframework.protobuf";
|
||||
option java_outer_classname = "OuterSample";
|
||||
option java_multiple_files = true;
|
||||
|
||||
message Msg {
|
||||
optional string foo = 1;
|
||||
optional SecondMsg blah = 2;
|
||||
}
|
||||
|
||||
message SecondMsg {
|
||||
optional int32 blah = 1;
|
||||
}
|
||||
Loading…
Reference in New Issue