[DOXIA-614] Support passing source reference to Doxia instance

Closes #35

doxia-core/src/main/java/org/apache/maven/doxia/DefaultDoxia.java

@@ -56,12 +56,20 @@ public class DefaultDoxia
     /** {@inheritDoc} */
     public void parse( Reader source, String parserId, Sink sink )
         throws ParserNotFoundException, ParseException
+    {
+        this.parse( source, parserId, sink, null );
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public void parse( Reader source, String parserId, Sink sink, String reference )
+        throws ParserNotFoundException, ParseException
     {
         Parser parser = parserManager.getParser( parserId );
 
         parser.enableLogging( new PlexusLoggerWrapper( getLogger() ) );
 
-        parser.parse( source, sink );
+        parser.parse( source, sink, reference );
     }
 
     /** {@inheritDoc} */

doxia-core/src/main/java/org/apache/maven/doxia/Doxia.java

@@ -50,6 +50,20 @@ public interface Doxia
     void parse( Reader source, String parserId, Sink sink )
         throws ParserNotFoundException, ParseException;
 
+    /**
+     * Parses the given source model using a parser with given id,
+     * and emits Doxia events into the given sink.
+     *
+     * @param source not null reader that provides the source document
+     * @param parserId identifier for the parser to use
+     * @param sink a sink that consumes the Doxia events
+     * @param reference string containing the reference to the source (e.g. filename)
+     * @throws ParserNotFoundException if no parser could be found for the given id
+     * @throws ParseException if the model could not be parsed
+     */
+    void parse( Reader source, String parserId, Sink sink, String reference )
+        throws ParserNotFoundException, ParseException;
+
     /**
      * Return a parser for the given <code>parserId</code>.
      *

doxia-core/src/test/java/org/apache/maven/doxia/DefaultDoxiaTest.java

@@ -0,0 +1,54 @@
+package org.apache.maven.doxia;
+
+/*
+ * 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.
+ */
+
+import org.apache.maven.doxia.parser.manager.ParserNotFoundException;
+import org.codehaus.plexus.PlexusTestCase;
+import org.junit.Test;
+
+public class DefaultDoxiaTest extends PlexusTestCase
+{
+
+    @Test
+    public void testCreatesDefaultDoxia()
+    {
+        final DefaultDoxia defaultDoxia = new DefaultDoxia();
+
+        assertNotNull( defaultDoxia );
+    }
+
+    @Test
+    public void testFailsWhenParserIdDoesNotExist() throws Exception
+    {
+        final String parserId = "a-parser";
+        final Doxia doxia = lookup( Doxia.class );
+
+        try
+        {
+            doxia.getParser( parserId );
+            fail( "Call should fail with ParserNotFoundException" );
+        }
+        catch ( ParserNotFoundException e )
+        {
+            assertEquals( "Cannot find parser with id = a-parser", e.getMessage() );
+        }
+    }
+
+}