PlainTextFormatter.java

package org.kvj.bravo7.format;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

import android.text.SpannableStringBuilder;
import android.text.TextUtils;
import android.text.style.ForegroundColorSpan;

public class PlainTextFormatter<T> {

	private static final String TAG = "TextFormatter";
	TextFormatter<T>[] formatters;

	public PlainTextFormatter(TextFormatter<T>... formatters) {
		this.formatters = formatters;
	}

	public static void addSpan(SpannableStringBuilder buffer, String text,
			Object... span) {
		if (null == text) {
			return;
		}
		int start = buffer.length();
		int end = start + text.length();
		buffer.append(text);
		if (null != span) {
			for (int i = 0; i < span.length; i++) {
				if (null != span[i]) {
					buffer.setSpan(span[i], start, end,
							SpannableStringBuilder.SPAN_EXCLUSIVE_EXCLUSIVE);
				}
			}
		}
	}

	public void setFormatters(TextFormatter<T>[] formatters) {
		this.formatters = formatters;
	}

	private void writePlainText(T note, SpannableStringBuilder sb,
			int defColor, String text, int index, boolean selected) {
		boolean textEmpty = TextUtils.isEmpty(text);
		if (index >= formatters.length || textEmpty) {
			if (!textEmpty) { // Not write default
				addSpan(sb, text, new ForegroundColorSpan(defColor));
			}
			return;
		}
		TextFormatter<T> formatter = formatters[index];
		Matcher m = null;
		Pattern p = formatter.getPattern(note, selected);
		if (null != p) {
			m = p.matcher(text);
		}
		if (null == m || !m.find()) {
			writePlainText(note, sb, defColor, text, index + 1, selected);
			return;
		}
		do {
			StringBuffer buffer = new StringBuffer();
			m.appendReplacement(buffer, "");
			if (0 != buffer.length()) {
				writePlainText(note, sb, defColor, buffer.toString(),
						index + 1, selected);
			}
			formatter.format(note, sb, m, m.group(), selected);
		} while (m.find());
		StringBuffer buffer = new StringBuffer();
		m.appendTail(buffer);
		if (0 != buffer.length()) {
			writePlainText(note, sb, defColor, buffer.toString(), index + 1,
					selected);
		}
	}

	public void writePlainText(T note, SpannableStringBuilder sb, int defColor,
			String text, boolean selected) {
		writePlainText(note, sb, defColor, text, 0, selected);
	}
}