AIR.Common.Web.WebHelper.java Source code

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Here is the source code for AIR.Common.Web.WebHelper.java

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/*******************************************************************************
 * Educational Online Test Delivery System Copyright (c) 2014 American
 * Institutes for Research
 * 
 * Distributed under the AIR Open Source License, Version 1.0 See accompanying
 * file AIR-License-1_0.txt or at http://www.smarterapp.org/documents/
 * American_Institutes_for_Research_Open_Source_Software_License.pdf
 ******************************************************************************/
/**
 *
 */
package AIR.Common.Web;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import org.apache.commons.lang.StringUtils;

import AIR.Common.Web.Session.HttpContext;

/**
 * @author Shiva BEHERA [sbehera@air.org]
 * 
 */
public class WebHelper {
    public static String getQueryString(String name) {
        return HttpContext.getCurrentContext().getRequest().getParameter(name);
    }

    public static int getQueryValueInt(String name) {
        String value = getQueryString(name);
        if (StringUtils.isEmpty(value))
            return 0;
        return Integer.parseInt(value);
    }

    public static long getQueryValueLong(String name) {
        String value = getQueryString(name);
        if (StringUtils.isEmpty(value))
            return 0;
        return Long.parseLong(value);
    }

    public static boolean getQueryBoolean(String name) {
        return getQueryBoolean(name, false);
    }

    public static boolean getQueryBoolean(String name, boolean defaultValue) {
        String value = getQueryString(name);
        if (value != null) {
            return Boolean.parseBoolean(value);
        }
        return defaultValue;
    }

    public static List<String> getQueryValues(String name) {
        String[] values = HttpContext.getCurrentContext().getRequest().getParameterValues(name);
        if (values != null) {
            return Arrays.<String>asList(values);
        }
        return new ArrayList<String>();
    }

    /**
     * Set Content Type in HttpServletResponse
     * 
     * @param contentType
     */
    public static void setContentType(String contentType) {
        HttpContext.getCurrentContext().getResponse().setContentType(contentType);
    }

    /**
     * Set Content Type in HttpServletResponse based in Enum ContentType value
     * 
     * @param contentType
     */
    public static void setContentType(ContentType contentType) {
        switch (contentType) {
        case Text:
            setContentType("text/plain");
            break;
        case Xml:
            setContentType("text/xml");
            break;
        case Html:
            setContentType("text/html");
            break;
        case Json:
            setContentType("application/json");
            break;
        case Javascript:
            setContentType("text/javascript");
            break;
        }
    }

    // / <summary>
    // / Write out a raw string to HTTP output stream.
    // / </summary>
    public static void writeString(String value) throws IOException {
        HttpContext.getCurrentContext().getResponse().getWriter().write(value);
    }

    // / <summary>
    // / Write out a raw string to HTTP output stream.
    // / </summary>
    public static void writeString(String value, Object[] values) throws IOException {
        writeString(String.format(value, values));
    }

    // SB-366 For writing json response
    public static void writeJsonString(String value) throws IOException {
        HttpContext.getCurrentContext().getResponse().setContentType("application/json");
        writeString(value);
    }
}