ALF-11031: Persist object graph to file

Implemented so that the graph can actually be rendered to XML as a OutputStream, File, Writer.



git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@31548 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

source/java/org/alfresco/util/schemacomp/SchemaToXML.java

@@ -0,0 +1,92 @@
+/*
+ * Copyright (C) 2005-2011 Alfresco Software Limited.
+ *
+ * This file is part of Alfresco
+ *
+ * Alfresco is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Alfresco is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with Alfresco. If not, see <http://www.gnu.org/licenses/>.
+ */
+package org.alfresco.util.schemacomp;
+
+import javax.xml.transform.OutputKeys;
+import javax.xml.transform.Transformer;
+import javax.xml.transform.TransformerConfigurationException;
+import javax.xml.transform.TransformerFactory;
+import javax.xml.transform.sax.SAXTransformerFactory;
+import javax.xml.transform.sax.TransformerHandler;
+import javax.xml.transform.stream.StreamResult;
+
+import org.alfresco.util.schemacomp.model.Schema;
+import org.xml.sax.SAXException;
+
+import com.sun.star.uno.RuntimeException;
+
+/**
+ * Converts an in-memory Schema to an XML output stream.
+ * 
+ * @author Matt Ward
+ */
+public class SchemaToXML
+{
+    private TransformerHandler xmlOut;
+    private Schema schema;
+    
+    public SchemaToXML(Schema schema, StreamResult streamResult)
+    {
+        final SAXTransformerFactory stf = (SAXTransformerFactory) TransformerFactory.newInstance();
+        try
+        {
+            xmlOut = stf.newTransformerHandler();
+        }
+        catch (TransformerConfigurationException error)
+        {
+            throw new RuntimeException("Unable to create TransformerHandler.", error);
+        }
+        final Transformer t = xmlOut.getTransformer();
+        try
+        {
+            t.setOutputProperty("{http://xml.apache.org/xalan}indent-amount", "2");
+        }
+        catch (final IllegalArgumentException e)
+        {
+            // It was worth a try
+        }
+        t.setOutputProperty(OutputKeys.INDENT, "yes");
+        xmlOut.setResult(streamResult);
+        
+        
+        this.schema = schema;
+    }
+    
+    
+    public void execute()
+    {
+        try
+        {
+            attemptTransformation();
+        }
+        catch (SAXException e)
+        {
+            throw new RuntimeException("Unable to complete transformation.", e);
+        }
+    }
+    
+    private void attemptTransformation() throws SAXException
+    {
+        xmlOut.startDocument();
+        DbObjectXMLTransformer dboTransformer = new DbObjectXMLTransformer(xmlOut);
+        dboTransformer.output(schema);
+        xmlOut.endDocument();
+    }
+  
+}