com.googlecode.psiprobe.jsp.ParamToggleTag.java Source code

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Here is the source code for com.googlecode.psiprobe.jsp.ParamToggleTag.java

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/*
 * Licensed under the GPL License.  You may not use this file except in
 * compliance with the License.  You may obtain a copy of the License at
 *
 *     http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 *
 * THIS PACKAGE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
 * MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */
package com.googlecode.psiprobe.jsp;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.Enumeration;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.TagSupport;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.web.bind.ServletRequestUtils;

/**
 * 
 * @author Vlad Ilyushchenko
 * @author Mark Lewis
 */
public class ParamToggleTag extends TagSupport {

    private Log logger = LogFactory.getLog(getClass());
    private String param = "size";

    public int doStartTag() throws JspException {
        boolean getSize = ServletRequestUtils.getBooleanParameter(pageContext.getRequest(), param, false);
        StringBuffer query = new StringBuffer();
        query.append(param).append("=").append(!getSize);
        String encoding = pageContext.getResponse().getCharacterEncoding();
        for (Enumeration en = pageContext.getRequest().getParameterNames(); en.hasMoreElements();) {
            String name = (String) en.nextElement();
            if (!param.equals(name)) {
                try {
                    String value = ServletRequestUtils.getStringParameter(pageContext.getRequest(), name, "");
                    String encodedValue = URLEncoder.encode(value, encoding);
                    query.append("&").append(name).append("=").append(encodedValue);
                } catch (UnsupportedEncodingException e) {
                    throw new JspException(e);
                }
            }
        }
        try {
            pageContext.getOut().print(query);
        } catch (IOException e) {
            logger.debug("Exception printing query string to JspWriter", e);
            throw new JspException(e);
        }
        return EVAL_BODY_INCLUDE;
    }

    public String getParam() {
        return param;
    }

    public void setParam(String param) {
        this.param = param;
    }
}