src: refactor java indexer

* renamed java name classes
* rearranged methods in ContextAwareAstVisitor to match the order in AstVisitor

java_indexer/src/main/java/com/sourcetrail/name/FileName.java

@@ -0,0 +1,29 @@
+package com.sourcetrail.name;
+
+import java.io.File;
+
+public class FileName implements SymbolName
+{
+	private File m_filePath = null;
+
+	public FileName(File filePath)
+	{
+		m_filePath = filePath;
+	}
+
+	@Override
+	public NameHierarchy toNameHierarchy() 
+	{
+		NameHierarchy nameHierarchy;
+		if (m_filePath != null)
+		{
+			nameHierarchy = new NameHierarchy(m_filePath.toString().replaceAll("\\\\", "/"));
+		}
+		else
+		{
+			nameHierarchy = new NameHierarchy("unsolved-file");
+		}
+		nameHierarchy.setSeparator('/');
+		return nameHierarchy;
+	}
+}