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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.tuscany.sca.databinding.json.axiom;
import java.io.IOException;
import java.io.OutputStream;
import java.io.Writer;
import java.util.HashMap;
import java.util.Map;
import javax.xml.stream.XMLStreamConstants;
import javax.xml.stream.XMLStreamReader;
import org.apache.axiom.om.OMDataSource;
import org.apache.axiom.om.OMException;
import org.apache.axiom.om.OMOutputFormat;
import org.codehaus.jettison.json.JSONObject;
import org.codehaus.jettison.json.JSONTokener;
import org.codehaus.jettison.mapped.MappedXMLInputFactory;
/**
* JSONDataSource keeps the JSON String inside and consumes it when needed. This is to be kept in the
* OMSourcedElementImpl and can be used either to expand the tree or get the JSON String directly without expanding.
* This uses the "Mapped" JSON convention.
*
* @version $Rev$ $Date$
*/
public class JSONDataSource implements OMDataSource {
protected JSONObject json;
public JSONDataSource(JSONObject json) {
this.json = json;
}
/**
* Writes JSON into the output stream. As this should write JSON, it directly gets the JSON string and writes it
* without expanding the tree.
*
* @param outputStream the stream to be written into
* @param omOutputFormat format of the message, this is ignored.
* @throws javax.xml.stream.XMLStreamException if there is an error while writing the message in to the output
* stream.
*/
public void serialize(OutputStream outputStream, OMOutputFormat omOutputFormat)
throws javax.xml.stream.XMLStreamException {
try {
String encoding = omOutputFormat == null ? "UTF-8" : omOutputFormat.getCharSetEncoding();
outputStream.write(getJSONString().getBytes(encoding));
} catch (IOException e) {
throw new OMException();
}
}
/**
* Writes JSON through the writer. As this should write JSON, it directly gets the JSON string and writes it without
* expanding the tree.
*
* @param writer Writer to be written into
* @param omOutputFormat format of the message, this is ignored.
* @throws javax.xml.stream.XMLStreamException if there is an error while writing the message through the writer.
*/
public void serialize(Writer writer, OMOutputFormat omOutputFormat) throws javax.xml.stream.XMLStreamException {
try {
writer.write(getJSONString());
} catch (IOException e) {
throw new OMException();
}
}
/**
* Writes XML through the XMLStreamWriter. As the input data source is JSON, this method needs to get a StAX reader
* from that JSON String. Therefore this uses the getReader() method to get the StAX reader writes the events into
* the XMLStreamWriter.
*
* @param xmlStreamWriter StAX writer to be written into
* @throws javax.xml.stream.XMLStreamException if there is an error while writing the message through the StAX
* writer.
*/
public void serialize(javax.xml.stream.XMLStreamWriter xmlStreamWriter) throws javax.xml.stream.XMLStreamException {
XMLStreamReader reader = getReader();
xmlStreamWriter.writeStartDocument();
while (reader.hasNext()) {
int x = reader.next();
switch (x) {
case XMLStreamConstants.START_ELEMENT:
xmlStreamWriter.writeStartElement(reader.getPrefix(), reader.getLocalName(), reader
.getNamespaceURI());
int namespaceCount = reader.getNamespaceCount();
for (int i = namespaceCount - 1; i >= 0; i--) {
xmlStreamWriter.writeNamespace(reader.getNamespacePrefix(i), reader.getNamespaceURI(i));
}
int attributeCount = reader.getAttributeCount();
for (int i = 0; i < attributeCount; i++) {
xmlStreamWriter.writeAttribute(reader.getAttributePrefix(i),
reader.getAttributeNamespace(i),
reader.getAttributeLocalName(i),
reader.getAttributeValue(i));
}
break;
case XMLStreamConstants.START_DOCUMENT:
break;
case XMLStreamConstants.CHARACTERS:
xmlStreamWriter.writeCharacters(reader.getText());
break;
case XMLStreamConstants.CDATA:
xmlStreamWriter.writeCData(reader.getText());
break;
case XMLStreamConstants.END_ELEMENT:
xmlStreamWriter.writeEndElement();
break;
case XMLStreamConstants.END_DOCUMENT:
xmlStreamWriter.writeEndDocument();
break;
case XMLStreamConstants.SPACE:
break;
case XMLStreamConstants.COMMENT:
xmlStreamWriter.writeComment(reader.getText());
break;
case XMLStreamConstants.DTD:
xmlStreamWriter.writeDTD(reader.getText());
break;
case XMLStreamConstants.PROCESSING_INSTRUCTION:
xmlStreamWriter.writeProcessingInstruction(reader.getPITarget(), reader.getPIData());
break;
case XMLStreamConstants.ENTITY_REFERENCE:
xmlStreamWriter.writeEntityRef(reader.getLocalName());
break;
default:
throw new OMException();
}
}
xmlStreamWriter.writeEndDocument();
}
/**
* Gives the StAX reader using the "Mapped" formatted input JSON String.
*
* @return The XMLStreamReader according to the JSON String.
* @throws javax.xml.stream.XMLStreamException if there is an error while making the StAX reader.
*/
public javax.xml.stream.XMLStreamReader getReader() throws javax.xml.stream.XMLStreamException {
Map<String, String> nsMap = new HashMap<String, String>();
nsMap.put("", "");
// input factory for "Mapped" convention
MappedXMLInputFactory inputFactory = new MappedXMLInputFactory(nsMap);
String jsonString = this.getJSONString();
return inputFactory.createXMLStreamReader(new JSONTokener(jsonString));
}
// returns the json string by consuming the JSON input stream.
protected String getJSONString() {
return json.toString();
}
}
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