TemplateUtils.java

package marubinotto.piggydb.ui.page.common;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.StringReader;
import java.io.UnsupportedEncodingException;
import java.util.Map;

import marubinotto.util.RegexUtils;
import marubinotto.util.ThreadLocalCache;
import marubinotto.util.RegexUtils.MatchProcessor;
import marubinotto.util.velocity.InescapableWrapper;
import net.sf.click.util.MessagesMap;

import org.apache.commons.codec.net.URLCodec;
import org.apache.commons.lang.StringEscapeUtils;
import org.apache.commons.lang.StringUtils;
import org.apache.commons.lang.UnhandledException;
import org.apache.oro.text.regex.MalformedPatternException;
import org.apache.oro.text.regex.MatchResult;
import org.apache.oro.text.regex.Pattern;
import org.apache.oro.text.regex.Perl5Compiler;
import org.apache.oro.text.regex.Perl5Matcher;

public class TemplateUtils {

	public static final TemplateUtils INSTANCE = new TemplateUtils();

	private static Pattern menuTitlePattern;
	static {
		try {
			menuTitlePattern = new Perl5Compiler().compile("(>(\\w|-)+?<)");
		}
		catch (MalformedPatternException e) {
			throw new UnhandledException(e);
		}
	}
	
	public Object returnIfTrue(Object object, boolean condition) {
	  return condition ? object : "";
	}

	public Object nullToEmpty(Object object) {
		return object == null ? "" : object;
	}
	
	public Object blankToNbsp(Object object) {
		return object == null || StringUtils.isBlank(object.toString()) ? raw(" ") : object;
	}

	@SuppressWarnings("rawtypes")
	public Object getWithDefault(Map map, String key, String defaultValue) {
		Object value = map.get(key);
		return value != null ? value : defaultValue;
	}
	
	@SuppressWarnings({"rawtypes", "unchecked"})
	public Object getUiState(Map map, String key, String defaultValue) {
		Map<String, Object> uiState = (Map<String, Object>)map.get(Session.SK_UI_STATE);
		if (uiState == null) return defaultValue;
		Object value = uiState.get(key);
		return value != null ? value : defaultValue;
	}

	public Object renderMenuItem(Object item, final MessagesMap messages) {
		if (item == null) {
			return "";
		}
		return raw(RegexUtils.substitute(
			ThreadLocalCache.get(Perl5Matcher.class),
			menuTitlePattern, 
			new MatchProcessor() {
				public String process(MatchResult match) {
					String matchStr = match.group(1);
					String title = matchStr.substring(1, matchStr.length() - 1);
					return ">" + messages.get(title) + "<";
				}
			}, 
			item.toString()));
	}

	public String sanitizeNewlines(Object src) throws IOException {
		if (src == null) {
			return "";
		}
		StringBuffer result = new StringBuffer();
		BufferedReader reader = new BufferedReader(new StringReader(src.toString()));
		String line = null;
		while ((line = reader.readLine()) != null) {
			result.append(line);
		}
		return result.toString();
	}

	public Object link(String url) {
		return raw("<a href=\"" + url + "\" target=\"_blank\">" + url + "</a>");
	}
	
	public Object linkLabel(String url, String label) {
    return raw("<a href=\"" + url + "\" target=\"_blank\">" + label + "</a>");
  }

	public Object raw(Object object) {
		return object == null ? "" : 
			new InescapableWrapper(object);
	}

	public Object escapeAmp(Object object) {
		return object == null ? "" : 
			StringUtils.replace(object.toString(), "&", "&");
	}

	public Object escapeXml(Object object) {
		return object == null ? null : 
			raw(StringEscapeUtils.escapeXml(object.toString()));
	}
	
	public Object escapeJs(Object object) {
		return object == null ? "" : 
			StringEscapeUtils.escapeJavaScript(object.toString());
	}

	public Object defaultIfNull(Object object, Object defaultValue) {
		return object != null ? object : defaultValue;
	}

	public Object urlEncode(Object object) throws UnsupportedEncodingException {
		return object == null ? null : 
			new URLCodec().encode(object.toString(), AbstractWebResource.CHAR_ENCODING);
	}
}