package com.moral.monitor.util;

import java.util.Enumeration;
import java.util.Map;
import java.util.TreeMap;

import javax.servlet.ServletRequest;

import org.apache.commons.lang3.StringUtils;
import org.springframework.util.Assert;

public class WebUtils extends org.springframework.web.util.WebUtils {
	
	public static Map<String, Object> getParametersStartingWith(ServletRequest request, String prefix) {
		Assert.notNull(request, "Request must not be null");
		Enumeration<String> paramNames = request.getParameterNames();
		Map<String, Object> params = new TreeMap<String, Object>();
		if (prefix == null) {
			prefix = "";
		}
		while (paramNames != null && paramNames.hasMoreElements()) {
			String paramName = paramNames.nextElement();
			if ("".equals(prefix) || paramName.startsWith(prefix)) {
				String unprefixed = paramName.substring(prefix.length());
				String[] values = request.getParameterValues(paramName);
				if (values == null || values.length == 0 ) {
					// Do nothing, no values found at all.
				}
				else if (values.length > 1) {
					params.put(unprefixed, values);
				}
				else {
					if (StringUtils.isNotBlank(values[0])) {
						params.put(unprefixed, values[0]);
					}
				}
			}
		}
		return params;
	}

}