build: switch to Maven configuration for JavaIndexer

java_indexer/src/main/java/com/sourcetrail/FileContent.java

@@ -0,0 +1,57 @@
+package com.sourcetrail;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.Optional;
+
+import com.github.javaparser.Position;
+
+public class FileContent 
+{
+	public class Location
+	{
+		public int line;
+		public int column;
+		
+		Location(int line, int column)
+		{
+			this.line = line;
+			this.column = column;
+		}
+	}
+	
+	private List<String> m_lines;
+	
+	public FileContent(String text)
+	{
+		m_lines = Arrays.asList(text.split("\\r?\\n"));
+	}
+	
+	public Location find(String s)
+	{
+		return find(s, Position.pos(1, 1));
+	}
+	
+	public Location find(String s, Optional<Position> from)
+	{
+		return find(s, from.orElse(Position.pos(1, 1)));
+	}
+	
+	public Location find(String s, Position from)
+	{
+		int lineIndex = from.line - 1;
+		int startColumn = from.column - 1;
+		int column = -1;
+		while (lineIndex < m_lines.size())
+		{
+			column = m_lines.get(lineIndex).indexOf(s, startColumn);
+			if (column != -1)
+			{
+				return new Location(lineIndex + 1, column + 1);
+			}
+			startColumn = 0;
+			lineIndex++;
+		}
+		return new Location(0, 0);
+	}
+}