com.jquery.web.Request.java Source code

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Here is the source code for com.jquery.web.Request.java

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/*
 * jQuery web framework
 * 
 * Copyright (c) 2007 Jrn Zaefferer
 * Dual licensed under the MIT and GPL licenses.
 * 
 * $Id: Request.java 2924 2007-08-27 08:13:02Z joern.zaefferer $
 */
package com.jquery.web;

import java.lang.reflect.InvocationTargetException;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;

import org.apache.commons.beanutils.BeanUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * Provides a threadlocal reference to the current request and mapping
 * facilities from that request to objects (see {@link #mapTo(Object)}).
 * 
 * Depends on Apache Commons Beanutils, servlet-api and portlet-api.
 */
public class Request {

    private final static Log log = LogFactory.getLog(Request.class);

    private final Map<String, Object> request = new HashMap<String, Object>();

    private static final ThreadLocal<HttpServletRequest> requestHolder = new ThreadLocal<HttpServletRequest>();

    static void set(HttpServletRequest servletRequest) {
        requestHolder.set(servletRequest);
    }

    public Request(HttpServletRequest servletRequest) {
        from(servletRequest);
    }

    public Request() {
        from(requestHolder.get());
    }

    private void from(HttpServletRequest servletRequest) {
        Enumeration<?> names = servletRequest.getParameterNames();
        while (names.hasMoreElements()) {
            String name = (String) names.nextElement();
            request.put(name, servletRequest.getParameterValues(name));
        }
    }

    public static HttpServletRequest servlet() {
        return requestHolder.get();
    }

    public static <T> T map(T target) {
        return new Request().mapTo(target);
    }

    public static <T> T map(Class<T> clazz) {
        try {
            return map(clazz.newInstance());
        } catch (InstantiationException e) {
            throw new RuntimeException(e);
        } catch (IllegalAccessException e) {
            throw new RuntimeException(e);
        }
    }

    public <T> T mapTo(T target) {
        try {
            BeanUtils.populate(target, request);
        } catch (IllegalAccessException e) {
            log.warn("couldn't map " + request + " to " + target, e);
        } catch (InvocationTargetException e) {
            log.warn("couldn't map " + request + " to " + target, e);
        }
        return target;
    }

    /**
     * Get a single parameter from this request.
     * @param name The name of the parameter to get
     * @return The value of the parameter
     */
    public static String get(String name) {
        return requestHolder.get().getParameter(name);
    }

    public static String getRemoteUser() {
        return requestHolder.get().getRemoteUser();
    }

}