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JacksonJson.java 6.89 KiB
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package com.messners.gitlab.api;
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import java.io.IOException;
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import java.io.Reader;
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import java.util.Date;
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import javax.ws.rs.Produces;
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import javax.ws.rs.core.MediaType;
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import javax.ws.rs.ext.ContextResolver;
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import javax.ws.rs.ext.Provider;
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import com.fasterxml.jackson.core.JsonGenerationException;
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import com.fasterxml.jackson.core.JsonGenerator;
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import com.fasterxml.jackson.core.JsonParseException;
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import com.fasterxml.jackson.core.JsonProcessingException;
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import com.fasterxml.jackson.core.Version;
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import com.fasterxml.jackson.databind.DeserializationConfig;
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import com.fasterxml.jackson.databind.JsonMappingException;
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import com.fasterxml.jackson.databind.JsonSerializer;
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import com.fasterxml.jackson.databind.ObjectMapper;
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import com.fasterxml.jackson.databind.ObjectWriter;
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import com.fasterxml.jackson.databind.PropertyNamingStrategy;
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import com.fasterxml.jackson.databind.SerializationConfig;
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import com.fasterxml.jackson.databind.SerializerProvider;
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import com.fasterxml.jackson.databind.annotation.JsonSerialize.Inclusion;
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import com.fasterxml.jackson.databind.module.SimpleModule;
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import com.fasterxml.jackson.jaxrs.json.JacksonJaxbJsonProvider;
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import com.fasterxml.jackson.annotation.JsonInclude.Include;
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import com.fasterxml.jackson.core.JsonGenerationException;
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import com.fasterxml.jackson.core.JsonGenerator;
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import com.fasterxml.jackson.core.JsonParseException;
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import com.fasterxml.jackson.core.JsonProcessingException;
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import com.fasterxml.jackson.databind.DeserializationFeature;
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import com.fasterxml.jackson.databind.JsonMappingException;
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import com.fasterxml.jackson.databind.JsonNode;
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import com.fasterxml.jackson.databind.JsonSerializer;
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import com.fasterxml.jackson.databind.ObjectMapper;
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import com.fasterxml.jackson.databind.ObjectWriter;
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import com.fasterxml.jackson.databind.SerializationFeature;
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import com.fasterxml.jackson.databind.SerializerProvider;
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import com.fasterxml.jackson.databind.module.SimpleModule;
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import com.fasterxml.jackson.jaxrs.json.JacksonJaxbJsonProvider;
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/*
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import org.codehaus.jackson.JsonGenerationException;
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import org.codehaus.jackson.JsonGenerator;
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import org.codehaus.jackson.JsonParseException;
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import org.codehaus.jackson.JsonProcessingException;
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import org.codehaus.jackson.Version;
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import org.codehaus.jackson.jaxrs.JacksonJaxbJsonProvider;
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import org.codehaus.jackson.map.DeserializationConfig;
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import org.codehaus.jackson.map.JsonMappingException;
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import org.codehaus.jackson.map.JsonSerializer;
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import org.codehaus.jackson.map.ObjectMapper;
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import org.codehaus.jackson.map.ObjectWriter;
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import org.codehaus.jackson.map.PropertyNamingStrategy;
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import org.codehaus.jackson.map.SerializationConfig;
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import org.codehaus.jackson.map.SerializerProvider;
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import org.codehaus.jackson.map.annotate.JsonSerialize.Inclusion;
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import org.codehaus.jackson.map.module.SimpleModule;
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*/
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/**
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 * Jackson JSON Configuration and utility class.
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 */
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@Provider
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@Produces(MediaType.APPLICATION_JSON)
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public class JacksonJson extends JacksonJaxbJsonProvider implements ContextResolver<ObjectMapper> {
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private final ObjectMapper objectMapper; public JacksonJson() { objectMapper = new ObjectMapper(); objectMapper.setSerializationInclusion(Include.NON_NULL); objectMapper.setPropertyNamingStrategy(PropertyNamingStrategy.SNAKE_CASE); objectMapper.configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false); objectMapper.configure(SerializationFeature.WRITE_ENUMS_USING_TO_STRING, true); objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false); objectMapper.configure(DeserializationFeature.READ_ENUMS_USING_TO_STRING, true); SimpleModule module = new SimpleModule("GitLabApiJsonModule"); module.addSerializer(Date.class, new JsonDateSerializer()); objectMapper.registerModule(module); } /** * */ @Override public ObjectMapper getContext(Class<?> objectType) { return (objectMapper); } /** * Gets the ObjectMapper contained by this instance. * * @return the ObjectMapper contained by this instance */ public ObjectMapper getObjectMapper() { return (objectMapper); } /** * Unmarshal the JSON data on the specified Reader instance to an instance of the provided class. * * @param returnType an instance of this type class will be returned * @param reader the Reader instance that contains the JSON data * @return an instance of the provided class containing the parsed data from the Reader * @throws JsonParseException * @throws JsonMappingException * @throws IOException */ public <T> T unmarshal(Class<T> returnType, Reader reader) throws JsonParseException, JsonMappingException, IOException { ObjectMapper objectMapper = getContext(returnType); return (objectMapper.readValue(reader, returnType)); } /** * Unmarshal the JSON data contained by the string and populate an instance of the provided returnType class. * * @param returnType an instance of this type class will be returned * @param postData * @return an instance of the provided class containing the parsed data from the string * @throws JsonParseException * @throws JsonMappingException * @throws IOException */ public <T> T unmarshal(Class<T> returnType, String postData) throws JsonParseException, JsonMappingException, IOException { ObjectMapper objectMapper = getContext(returnType); return (objectMapper.readValue(postData, returnType)); } /** * Marshals the supplied object out as a formatted JSON string. *
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* @param object the object to output as a JSON string * @return a String containing the JSON for the specified object */ public <T> String marshal(final T object) { if (object == null) { throw new IllegalArgumentException("object parameter is null"); } ObjectWriter writer = objectMapper.writer().withDefaultPrettyPrinter(); String results = null; try { results = writer.writeValueAsString(object); } catch (JsonGenerationException e) { System.err.println("JsonGenerationException, message=" + e.getMessage()); } catch (JsonMappingException e) { e.printStackTrace(); System.err.println("JsonMappingException, message=" + e.getMessage()); } catch (IOException e) { System.err.println("IOException, message=" + e.getMessage()); } return (results); } /** * JsonSerializer for serializing ISO8601 formatted dates. */ public static class JsonDateSerializer extends JsonSerializer<Date> { @Override public void serialize(Date date, JsonGenerator gen, SerializerProvider provider) throws IOException, JsonProcessingException { String iso8601String = ISO8601.toString(date); gen.writeString(iso8601String); } } }