system/rest-spring/src/main/java/org/platformlambda/rest/serializers/MessageBodyWriterJson.java
/*
Copyright 2018-2023 Accenture Technology
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 org.platformlambda.rest.serializers;
import org.platformlambda.core.serializers.SimpleMapper;
import org.platformlambda.core.util.Utility;
import javax.ws.rs.Produces;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.ext.MessageBodyWriter;
import javax.ws.rs.ext.Provider;
import java.io.IOException;
import java.io.OutputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
@Provider
@Produces(MediaType.APPLICATION_JSON)
public class MessageBodyWriterJson<T> implements MessageBodyWriter<T> {
private static final Utility util = Utility.getInstance();
@Override
public boolean isWriteable(Class<?> cls, Type genericType, Annotation[] annotations, MediaType mediaType) {
return true;
}
@Override
public long getSize(T t, Class<?> cls, Type genericType, Annotation[] annotations, MediaType mediaType) {
// deprecated and ignored
return 0;
}
@Override
public void writeTo(T t, Class<?> cls, Type genericType, Annotation[] annotations, MediaType mediaType,
MultivaluedMap<String, Object> httpHeaders, OutputStream entityStream)
throws IOException, WebApplicationException {
if (t instanceof String) {
entityStream.write(util.getUTF((String) t));
} else if (t instanceof byte[]) {
entityStream.write((byte[]) t);
} else {
entityStream.write(util.getUTF(SimpleMapper.getInstance().getMapper().writeValueAsString(t)));
}
}
}