linkhtmltag.java

chatper4JdonCMS.rar

package com.jdon.cms.tags;

import java.io.IOException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.tagext.TagSupport;
import org.apache.struts.util.MessageResources;
import org.apache.struts.util.ResponseUtils;
import org.apache.struts.config.ModuleConfig;

import com.jdon.cms.events.PageForm;
import com.jdon.cms.events.NavlinkForm;

public class LinkHtmlTag extends TagSupport {

  /**
   * The hyperlink URI.
   */
  protected String name = null;

  protected String page = null;

  public String getName() {

    return (this.name);

  }

  public void setName(String name) {

    this.name = name;

  }

  /**
   * Return the hyperlink URI.
   */
  public String getPage() {

    return (this.page);

  }

  /**
   * Set the hyperlink URI.
   *
   * @param page Set the hyperlink URI
   */
  public void setPage(String page) {

    this.page = page;

  }

  // --------------------------------------------------------- Public Methods

  /**
   * Render the beginning of the hyperlink.
   *
   * @exception JspException if a JSP exception has occurred
   */
  public int doStartTag() throws JspException {

    // Generate the URL to be encoded
    ModuleConfig config = (ModuleConfig) pageContext.getRequest()
        .getAttribute(org.apache.struts.Globals.MODULE_KEY);

    HttpServletRequest request =
        (HttpServletRequest) pageContext.getRequest();
    StringBuffer url = new StringBuffer(request.getContextPath());
//        url.append(config.getPrefix());
    url.append(page);

    PageForm pageForm = null;
    NavlinkForm navlinkForm = null;
    try {
      pageForm = (PageForm) pageContext.findAttribute(name);
    } catch (ClassCastException e) {
      navlinkForm = (NavlinkForm) pageContext.findAttribute(name);
    }


    if (page.indexOf("?") < 0)
      url.append("?");
    else
      url.append("&");

    url.append("id=");
    if (pageForm != null)
        url.append(pageForm.getId());
    else if (navlinkForm != null){
      url.append(pageForm.getId());
    }
    else
        throw new JspException("no find pageForm");


    // Generate the hyperlink start element
    HttpServletResponse response =
        (HttpServletResponse) pageContext.getResponse();
    StringBuffer results = new StringBuffer("<a href=\"");
    results.append(response.encodeURL(url.toString()));
    results.append("\">");

    // Print this element to our output writer
    JspWriter writer = pageContext.getOut();
    try {
      writer.print(results.toString());
    } catch (IOException e) {
      throw new JspException
          ("LinkHtmlTag error");
    }

    // Evaluate the body of this tag
    return (EVAL_BODY_INCLUDE);

  }

  /**
   * Render the end of the hyperlink.
   *
   * @exception JspException if a JSP exception has occurred
   */
  public int doEndTag() throws JspException {

    // Print the ending element to our output writer
    JspWriter writer = pageContext.getOut();
    try {
      writer.print("</a>");
    } catch (IOException e) {
      throw new JspException
          ("LinkHtmlTag error");
    }

    return (EVAL_PAGE);

  }

  /**
   * Release any acquired resources.
   */
  public void release() {

    super.release();
    this.page = null;

  }

}