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com.dslplatform.json.jsonb.DslJsonbProvider Maven / Gradle / Ivy
DSL Platform compatible Java JSON library (https://dsl-platform.com)
package com.dslplatform.json.jsonb;
import com.dslplatform.json.DslJson;
import com.dslplatform.json.JsonWriter;
import com.dslplatform.json.SerializationException;
import com.dslplatform.json.runtime.Settings;
import javax.json.bind.Jsonb;
import javax.json.bind.JsonbBuilder;
import javax.json.bind.JsonbConfig;
import javax.json.bind.JsonbException;
import javax.json.bind.spi.JsonbProvider;
import java.io.*;
import java.lang.reflect.Type;
public class DslJsonbProvider extends JsonbProvider {
@Override
public JsonbBuilder create() {
return new DslJsonbBuilder();
}
private static class DslJsonbBuilder implements JsonbBuilder {
private final DslJson.Settings settings = Settings.withRuntime().skipDefaultValues(true).includeServiceLoader();
@Override
public JsonbBuilder withConfig(JsonbConfig config) {
config.getProperty("jsonb.null-values")
.ifPresent(o -> settings.skipDefaultValues(Boolean.FALSE.equals(o)));
return this;
}
@Override
public JsonbBuilder withProvider(javax.json.spi.JsonProvider provider) {
return this;
}
@Override
public Jsonb build() {
return new DslJsonb(settings);
}
}
private static class DslJsonb implements Jsonb {
private final DslJson dslJson;
private final ThreadLocal localWriter;
DslJsonb(DslJson.Settings settings) {
dslJson = new DslJson<>(settings);
localWriter = ThreadLocal.withInitial(dslJson::newWriter);
}
@Override
public T fromJson(String input, Class as) throws JsonbException {
return (T)fromJson(input, (Type)as);
}
@Override
public T fromJson(String input, Type type) throws JsonbException {
if (input == null) throw new JsonbException("input can't be null");
if (type == null) throw new JsonbException("type can't be null");
try {
byte[] bytes = input.getBytes("UTF-8");
return (T)dslJson.deserialize(type, bytes, bytes.length);
} catch (IOException e) {
throw new JsonbException(e.getMessage(), e.getCause());
}
}
@Override
public T fromJson(Reader reader, Class as) throws JsonbException {
return (T)fromJson(reader, (Type)as);
}
@Override
public T fromJson(Reader reader, Type type) throws JsonbException {
//TODO: maybe just use naive reader to stream conversion!?
throw new JsonbException("DSL-JSON does not support Reader API. Use InputStream API instead");
}
@Override
public T fromJson(InputStream stream, Class as) throws JsonbException {
return (T)fromJson(stream, (Type)as);
}
@Override
public T fromJson(InputStream stream, Type type) throws JsonbException {
if (stream == null) throw new JsonbException("stream can't be null");
if (type == null) throw new JsonbException("type can't be null");
try {
return (T)dslJson.deserialize(type, stream);
} catch (IOException e) {
throw new JsonbException(e.getMessage(), e.getCause());
}
}
@Override
public String toJson(Object obj) throws JsonbException {
try {
JsonWriter writer = localWriter.get();
writer.reset();
dslJson.serialize(writer, obj);
return new String(writer.getByteBuffer(), 0, writer.size(), "UTF-8");
} catch (IOException | SerializationException ex) {
throw new JsonbException(ex.getMessage(), ex.getCause());
}
}
@Override
public String toJson(Object obj, Type type) throws JsonbException {
if (type == null) throw new JsonbException("type can't be null");
try {
JsonWriter writer = localWriter.get();
writer.reset();
if (!dslJson.serialize(writer, type, obj)) {
throw new JsonbException("Unable to serialize provided " + type);
}
return new String(writer.getByteBuffer(), 0, writer.size(), "UTF-8");
} catch (IOException | SerializationException ex) {
throw new JsonbException(ex.getMessage(), ex.getCause());
}
}
@Override
public void toJson(Object obj, Writer writer) throws JsonbException {
if (writer == null) throw new JsonbException("writer can't be null");
try {
JsonWriter jw = localWriter.get();
jw.reset();
dslJson.serialize(jw, obj);
//TODO: not ideal... but lets use it instead of throwing an exception
writer.write(new String(jw.getByteBuffer(), 0, jw.size(), "UTF-8"));
} catch (IOException | SerializationException ex) {
throw new JsonbException(ex.getMessage(), ex.getCause());
}
}
@Override
public void toJson(Object obj, Type type, Writer writer) throws JsonbException {
if (type == null) throw new JsonbException("type can't be null");
if (writer == null) throw new JsonbException("writer can't be null");
try {
JsonWriter jw = localWriter.get();
jw.reset();
if (!dslJson.serialize(jw, type, obj)) {
throw new JsonbException("Unable to serialize provided " + type);
}
writer.write(new String(jw.getByteBuffer(), 0, jw.size(), "UTF-8"));
} catch (IOException | SerializationException ex) {
throw new JsonbException(ex.getMessage(), ex.getCause());
}
}
@Override
public void toJson(Object obj, OutputStream stream) throws JsonbException {
if (stream == null) throw new JsonbException("stream can't be null");
try {
dslJson.serialize(obj, stream);
} catch (IOException | SerializationException ex) {
throw new JsonbException(ex.getMessage(), ex.getCause());
}
}
@Override
public void toJson(Object obj, Type type, OutputStream stream) throws JsonbException {
if (type == null) throw new JsonbException("type can't be null");
if (stream == null) throw new JsonbException("stream can't be null");
JsonWriter jw = localWriter.get();
try {
jw.reset(stream);
if (!dslJson.serialize(jw, type, obj)) {
throw new JsonbException("Unable to serialize provided " + type);
}
jw.flush();
} catch (SerializationException ex) {
throw new JsonbException(ex.getMessage(), ex.getCause());
} finally {
jw.reset(null);
}
}
@Override
public void close() {
}
}
}
