1 files changed, 176 insertions, 0 deletions
diff --git a/sca-java-2.x/tags/2.0.1-RC1/modules/databinding-json/src/main/java/org/apache/tuscany/sca/databinding/json/axiom/JSONDataSource.java b/sca-java-2.x/tags/2.0.1-RC1/modules/databinding-json/src/main/java/org/apache/tuscany/sca/databinding/json/axiom/JSONDataSource.java
new file mode 100644
index 0000000000..5b0312056e
--- /dev/null
+++ b/sca-java-2.x/tags/2.0.1-RC1/modules/databinding-json/src/main/java/org/apache/tuscany/sca/databinding/json/axiom/JSONDataSource.java
@@ -0,0 +1,176 @@
+/*
+ * 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();
+    }
+
+}