org.bndly.rest.controller.impl.JSONGlobalEntityRenderer Maven / Gradle / Ivy
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package org.bndly.rest.controller.impl;
/*-
* #%L
* REST Controller Impl
* %%
* Copyright (C) 2013 - 2020 Cybercon GmbH
* %%
* 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.
* #L%
*/
import org.bndly.common.data.io.IOUtils;
import org.bndly.common.data.io.ReplayableInputStream;
import org.bndly.rest.api.ContentType;
import org.bndly.rest.controller.api.EntityParser;
import org.bndly.rest.controller.api.EntityRenderer;
import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.util.Map;
import java.util.concurrent.locks.ReadWriteLock;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import javax.xml.stream.XMLStreamWriter;
import org.codehaus.jettison.json.JSONException;
import org.codehaus.jettison.json.JSONObject;
import org.codehaus.jettison.mapped.Configuration;
import org.codehaus.jettison.mapped.MappedNamespaceConvention;
import org.codehaus.jettison.mapped.MappedXMLStreamReader;
import org.codehaus.jettison.mapped.MappedXMLStreamWriter;
/**
*
* @author cybercon <[email protected]>
*/
public abstract class JSONGlobalEntityRenderer implements EntityRenderer, EntityParser {
private final ReadWriteLock contextLock;
private final Map xmlToJsonNamespaces;
protected abstract JAXBContext getJAXBContext();
public JSONGlobalEntityRenderer(ReadWriteLock contextLock, Map xmlToJsonNamespaces) {
this.contextLock = contextLock;
this.xmlToJsonNamespaces = xmlToJsonNamespaces;
}
@Override
public ContentType getSupportedContentType() {
return ContentType.JSON;
}
@Override
public String getSupportedEncoding() {
return "UTF-8";
}
@Override
public void render(Object entity, OutputStream os) throws IOException {
contextLock.readLock().lock();
try {
JAXBContext ctx = getJAXBContext();
Configuration config = new Configuration();
config.setXmlToJsonNamespaces(xmlToJsonNamespaces);
MappedNamespaceConvention con = new MappedNamespaceConvention(config);
Writer writer = new OutputStreamWriter(os, getSupportedEncoding());
XMLStreamWriter xmlStreamWriter = new MappedXMLStreamWriter(con, writer);
Marshaller marshaller = ctx.createMarshaller();
marshaller.marshal(entity, xmlStreamWriter);
} catch (JAXBException ex) {
throw new IOException("could not create JAXB context while rendering entity", ex);
} finally {
contextLock.readLock().unlock();
}
}
@Override
public Object parse(ReplayableInputStream is, Class requiredType) throws IOException {
contextLock.readLock().lock();
try {
JAXBContext ctx = getJAXBContext();
Configuration config = new Configuration();
config.setXmlToJsonNamespaces(xmlToJsonNamespaces);
MappedNamespaceConvention con = new MappedNamespaceConvention(config);
String jsonString = IOUtils.readToString(is, "UTF-8");
JSONObject object = new JSONObject(jsonString);
XMLStreamReader reader = new MappedXMLStreamReader(object, con);
Unmarshaller unmarshaller = ctx.createUnmarshaller();
return unmarshaller.unmarshal(reader);
} catch (JAXBException ex) {
throw new IOException("could not create JAXB context while parsing entity", ex);
} catch (JSONException ex) {
throw new IOException("could not create json object while parsing entity", ex);
} catch (XMLStreamException ex) {
throw new IOException("could not read xml mapped json stream while parsing entity", ex);
} finally {
contextLock.readLock().unlock();
}
}
}