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Merge pull request #190 from kerkhofsd/jackson2
Fixes #189 Support Jackson2 on Alfresco 4
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178 changes: 178 additions & 0 deletions
178
...va/com/github/dynamicextensionsalfresco/polyfill/MappingJackson2HttpMessageConverter.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,178 @@ | ||
| /* | ||
| * Copyright 2002-2013 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 | ||
| * | ||
| * 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. | ||
| */ | ||
|
|
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| package com.github.dynamicextensionsalfresco.polyfill; | ||
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| import com.fasterxml.jackson.core.JsonEncoding; | ||
| import com.fasterxml.jackson.core.JsonGenerator; | ||
| import com.fasterxml.jackson.core.JsonProcessingException; | ||
| import com.fasterxml.jackson.databind.JavaType; | ||
| import com.fasterxml.jackson.databind.ObjectMapper; | ||
| import com.fasterxml.jackson.databind.SerializationFeature; | ||
| import java.io.IOException; | ||
| import java.lang.reflect.Type; | ||
| import java.nio.charset.Charset; | ||
| import org.springframework.http.HttpInputMessage; | ||
| import org.springframework.http.HttpOutputMessage; | ||
| import org.springframework.http.MediaType; | ||
| import org.springframework.http.converter.AbstractHttpMessageConverter; | ||
| import org.springframework.http.converter.HttpMessageConverter; | ||
| import org.springframework.http.converter.HttpMessageNotReadableException; | ||
| import org.springframework.http.converter.HttpMessageNotWritableException; | ||
| import org.springframework.util.Assert; | ||
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| /** | ||
| * Copy of the Spring implementation to support Json 2 (com.fasterxml) in Alfresco 4.2 | ||
| * | ||
| * In Alfresco 4.2, the default Spring MappingJackson2HttpMessageConverter to support Json 2 (com.fasterxml) is not yet | ||
| * available. Nevertheless, we want to support Json 2 if the {@link ObjectMapper} is available on the classpath. | ||
| */ | ||
| public class MappingJackson2HttpMessageConverter extends AbstractHttpMessageConverter<Object> | ||
| implements HttpMessageConverter<Object> { | ||
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| public static final Charset DEFAULT_CHARSET = Charset.forName("UTF-8"); | ||
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| private ObjectMapper objectMapper = new ObjectMapper(); | ||
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| private String jsonPrefix; | ||
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| private Boolean prettyPrint; | ||
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| public MappingJackson2HttpMessageConverter() { | ||
| super(new MediaType("application", "json", DEFAULT_CHARSET), | ||
| new MediaType("application", "*+json", DEFAULT_CHARSET)); | ||
| } | ||
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| public void setObjectMapper(ObjectMapper objectMapper) { | ||
| Assert.notNull(objectMapper, "ObjectMapper must not be null"); | ||
| this.objectMapper = objectMapper; | ||
| configurePrettyPrint(); | ||
| } | ||
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| private void configurePrettyPrint() { | ||
| if (this.prettyPrint != null) { | ||
| this.objectMapper.configure(SerializationFeature.INDENT_OUTPUT, this.prettyPrint); | ||
| } | ||
| } | ||
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| public ObjectMapper getObjectMapper() { | ||
| return this.objectMapper; | ||
| } | ||
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| public void setJsonPrefix(String jsonPrefix) { | ||
| this.jsonPrefix = jsonPrefix; | ||
| } | ||
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| public void setPrefixJson(boolean prefixJson) { | ||
| this.jsonPrefix = (prefixJson ? "{} && " : null); | ||
| } | ||
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| public void setPrettyPrint(boolean prettyPrint) { | ||
| this.prettyPrint = prettyPrint; | ||
| configurePrettyPrint(); | ||
| } | ||
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| @Override | ||
| public boolean canRead(Class<?> clazz, MediaType mediaType) { | ||
| return canRead(clazz, null, mediaType); | ||
| } | ||
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| public boolean canRead(Type type, Class<?> contextClass, MediaType mediaType) { | ||
| JavaType javaType = getJavaType(type, contextClass); | ||
| return (this.objectMapper.canDeserialize(javaType) && canRead(mediaType)); | ||
| } | ||
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| @Override | ||
| public boolean canWrite(Class<?> clazz, MediaType mediaType) { | ||
| return (this.objectMapper.canSerialize(clazz) && canWrite(mediaType)); | ||
| } | ||
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| @Override | ||
| protected boolean supports(Class<?> clazz) { | ||
| // should not be called, since we override canRead/Write instead | ||
| throw new UnsupportedOperationException(); | ||
| } | ||
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| @Override | ||
| protected Object readInternal(Class<?> clazz, HttpInputMessage inputMessage) | ||
| throws IOException, HttpMessageNotReadableException { | ||
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| JavaType javaType = getJavaType(clazz, null); | ||
| return readJavaType(javaType, inputMessage); | ||
| } | ||
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| public Object read(Type type, Class<?> contextClass, HttpInputMessage inputMessage) | ||
| throws IOException, HttpMessageNotReadableException { | ||
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| JavaType javaType = getJavaType(type, contextClass); | ||
| return readJavaType(javaType, inputMessage); | ||
| } | ||
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| private Object readJavaType(JavaType javaType, HttpInputMessage inputMessage) { | ||
| try { | ||
| return this.objectMapper.readValue(inputMessage.getBody(), javaType); | ||
| } catch (IOException ex) { | ||
| throw new HttpMessageNotReadableException("Could not read JSON: " + ex.getMessage(), ex); | ||
| } | ||
| } | ||
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| @Override | ||
| protected void writeInternal(Object object, HttpOutputMessage outputMessage) | ||
| throws IOException, HttpMessageNotWritableException { | ||
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| JsonEncoding encoding = getJsonEncoding(outputMessage.getHeaders().getContentType()); | ||
| JsonGenerator jsonGenerator = | ||
| this.objectMapper.getJsonFactory().createJsonGenerator(outputMessage.getBody(), encoding); | ||
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| // A workaround for JsonGenerators not applying serialization features | ||
| // https://github.com/FasterXML/jackson-databind/issues/12 | ||
| if (this.objectMapper.isEnabled(SerializationFeature.INDENT_OUTPUT)) { | ||
| jsonGenerator.useDefaultPrettyPrinter(); | ||
| } | ||
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| try { | ||
| if (this.jsonPrefix != null) { | ||
| jsonGenerator.writeRaw(this.jsonPrefix); | ||
| } | ||
| this.objectMapper.writeValue(jsonGenerator, object); | ||
| } catch (JsonProcessingException ex) { | ||
| throw new HttpMessageNotWritableException("Could not write JSON: " + ex.getMessage(), ex); | ||
| } | ||
| } | ||
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| protected JavaType getJavaType(Type type, Class<?> contextClass) { | ||
| return (contextClass != null) ? | ||
| this.objectMapper.getTypeFactory().constructType(type, contextClass) : | ||
| this.objectMapper.constructType(type); | ||
| } | ||
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| protected JsonEncoding getJsonEncoding(MediaType contentType) { | ||
| if (contentType != null && contentType.getCharSet() != null) { | ||
| Charset charset = contentType.getCharSet(); | ||
| for (JsonEncoding encoding : JsonEncoding.values()) { | ||
| if (charset.name().equals(encoding.getJavaName())) { | ||
| return encoding; | ||
| } | ||
| } | ||
| } | ||
| return JsonEncoding.UTF8; | ||
| } | ||
|
|
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| } |
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