/*
* Copyright 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.
*/
package ratpack.jackson.internal;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.google.common.reflect.TypeToken;
import ratpack.handling.Context;
import ratpack.http.TypedData;
import ratpack.jackson.JsonParseOpts;
import ratpack.parse.Parse;
import ratpack.parse.ParserSupport;
import javax.inject.Inject;
import java.io.IOException;
import java.io.InputStream;
import static ratpack.util.ExceptionUtils.uncheck;
import static ratpack.util.Types.cast;
public class JsonParser extends ParserSupport<JsonParseOpts> {
private static final TypeToken<JsonNode> JSON_NODE_TYPE = TypeToken.of(JsonNode.class);
private final ObjectMapper objectMapper;
@Inject
public JsonParser(ObjectMapper objectMapper) {
super("application/json");
this.objectMapper = objectMapper;
}
@Override
public <T> T parse(Context context, TypedData body, Parse<T, JsonParseOpts> parse) {
JsonParseOpts opts = parse.getOpts();
TypeToken<T> type = parse.getType();
ObjectMapper objectMapper = getObjectMapper(opts);
try {
InputStream inputStream = body.getInputStream();
if (type.equals(JSON_NODE_TYPE)) {
return cast(objectMapper.readTree(inputStream));
} else {
return objectMapper.readValue(inputStream, toJavaType(type, objectMapper));
}
} catch (IOException e) {
throw uncheck(e);
}
}
private <T> JavaType toJavaType(TypeToken<T> type, ObjectMapper objectMapper) {
return objectMapper.getTypeFactory().constructType(type.getType());
}
private ObjectMapper getObjectMapper(JsonParseOpts opts) {
return opts.getObjectMapper() == null ? objectMapper : opts.getObjectMapper();
}
}