Friki example source code file (ListRow.java)

This example Friki source code file (ListRow.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Friki tags/keywords

abstractstringfetcher, abstractstringfetcher, linetransformcontext, linetransformcontext, listrow, matcher, object, splitlinesstringfilter, stack, string, string, stringbuffer, stringbuffer, stringstringsource, util

The Friki ListRow.java source code

package wiki;

import java.util.Stack;

import org.stringtree.factory.AbstractStringFetcher;
import org.stringtree.juicer.string.SplitLinesStringFilter;
import org.stringtree.juicer.string.StringFilter;
import org.stringtree.juicer.string.StringStringSource;
import org.stringtree.regex.Matcher;
import org.stringtree.regex.Pattern;
import org.stringtree.util.StringUtils;

class LineTransformContext 
	extends Stack
{
	public String getType()
	{
		return (isEmpty())
			? null
			: StringUtils.stringValue(peek());
	}

	public void endList(StringBuffer buf)
	{
		if (!isEmpty())
		{
			String type = StringUtils.stringValue(pop());
			buf.append("</");
			buf.append(type);
			buf.append(">\n");
		}
	}

	public void startList(String type, StringBuffer buf)
	{
		push(type);
		buf.append("<");
		buf.append(type);
		buf.append(">\n");
	}

	public void endAll(StringBuffer buf)
	{
		while (!isEmpty())
		{
			endList(buf);
		}
	}

	public void ensureType(StringBuffer buf, String type, int indent)
	{
		while (!isEmpty() && size() > indent)
		{
			endList(buf);
		}
		while (size() < indent)
		{
			startList(type, buf);
		}

		if (!type.equals(getType()))
		{
			endList(buf);
			startList(type, buf);
		}
	}
}

public class ListRow
	extends AbstractStringFetcher
{
	private static Pattern pattern = Pattern.compile("^(\t+)(\\*|[1234567890]+)\\.?\\s*(.+)$");
	 
	public Object getObject(String content)
	{
		LineTransformContext context = new LineTransformContext();
		StringBuffer buf = new StringBuffer();

		StringFilter rows = new SplitLinesStringFilter();
		rows.connectSource(new StringStringSource(content));
		
		for (String row = rows.nextString(); row != null; row = rows.nextString())
		{
			Matcher matcher = pattern.matcher(row);

			if (matcher.find() && matcher.groupCount() >= 3)
			{
				int indent = matcher.group(1).length();
				String type = ("*".equals(matcher.group(2))) ? "ul" : "ol";
				String text = matcher.group(3);

				context.ensureType(buf, type, indent);
				buf.append("<li>");
				buf.append(text);
				buf.append("</li>\n");
			}
			else
			{
				buf.append(row);
				buf.append("\n");
			}
		}
		context.endAll(buf);

		String ret = buf.toString();
		return ret;
	}
}