jahiabutton.java

java 写的一个新闻发布系统

package org.jahia.taglibs.button;

import org.jahia.utils.JahiaConsole;

import org.jahia.data.JahiaData;
import org.jahia.utils.JahiaTools;
import org.jahia.params.ParamBean;
import org.jahia.resourcebundle.JahiaResourceBundle;
import org.jahia.taglibs.resourcebundle.EngineResourceBundleTag;

import java.io.*;
import java.util.*;

import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.jsp.*;
import javax.servlet.jsp.tagext.*;

/**
 * Create a graphic rollover button defining by three parameters.
 *
 * All these following parameters are required ('JahiaTags.tld' file) :
 *
 * img :    The image button start name defined in the resource bundle properties
            files. For example if the button defined in the resource bundle file
            is 'sortOffButtonImg' and 'sortOnButtonIMg', the start name is 'sort'.
            This tag will retrieve automatically the end of string identifier.
 * href :   This is the anchor tag <A> "href" parameter.
 * alt :    Correspond to the <IMG> tag "alt" parameter.
 */
public class JahiaButton extends BodyTagSupport {

    public void setImg(String img) {
        this.img = img;
    }

    public void setHref(String href) {
        this.href = href;
    }

    public void setAlt(String alt) {
        this.alt = alt;
    }

    public int doStartTag() {

        // Recover 'jData'
        HttpServletRequest request = (HttpServletRequest)pageContext.getRequest();
        JahiaData jData = (JahiaData)request.getAttribute("org.jahia.data.JahiaData");
        if (jData == null) {
            HashMap tempEngineMap = (HashMap)request.getAttribute("org.jahia.engines.EngineHashMap");
            jData = (JahiaData)tempEngineMap.get("jData");
        }

        // Build the resource bundle image parameters
        String bImageOff = "";
        String bImageOn = "";
        try {
            bImageOff = EngineResourceBundleTag.parseResourceValue(
                            JahiaResourceBundle.getEngineResource(img + "OffButtonImg",
                                                                  jData.params(),
                                                                  jData.params().getLocale()),jData.params());
            bImageOn = EngineResourceBundleTag.parseResourceValue(
                            JahiaResourceBundle.getEngineResource(img + "OnButtonImg",
                                                                  jData.params(),
                                                                  jData.params().getLocale()),jData.params());

        } catch (MissingResourceException mre) {
            JahiaConsole.println("JahiaButton.doStartTag", mre.toString());
        }

        // FIXME : Why does the "JahiaResourceBundle.getEngineResource" method
        // return a null String when resource is not found ????
        if (bImageOff == null) bImageOff = "";
        if (bImageOn == null) bImageOn = "";
        bImageOff = getServerHttpPath(jData.params()) + bImageOff;
        bImageOn = getServerHttpPath(jData.params()) + bImageOn;
        // Define a unique ID that identify the rollover
        String sImgID = "img" + String.valueOf(imgID++);
        // Produce the HTML code
        try {
            JspWriter out = pageContext.getOut();
            StringBuffer str = new StringBuffer("\n");
            if (debug) {
                str.append("<!-- ============================================================= -->\n");
                str.append("<!-- The following HTML code is generated by 'jahiaButton' taglib -->\n");
                str.append("<!-- Parameters : img = ");
                    str.append(img); str.append("\n");
                str.append("                : href = ");
                    str.append(href); str.append("\n");
                str.append("                : alt = ");
                    str.append(alt);
                    str.append("\n--------------------------------------------------------------------->\n");
            }
            str.append("<a href=\"");
                str.append(href);
                str.append("\"\n");
            str.append("   onMouseOut=\"MM_swapImgRestore()\"\n");
            str.append("   onMouseOver=\"MM_swapImage('");
                str.append(sImgID);
                str.append("','','");
                str.append(bImageOn);
                str.append("',1)\">\n");
            str.append("   <img name=\"");
                str.append(sImgID);
                str.append("\" alt=\"");
                str.append(alt);
                str.append("\"\n");
            str.append("        src=\"");
                str.append(bImageOff);
                str.append("\" border=\"0\"></a>\n");
            // @todo : an optional focus parameter (yes/no) are to be implemented
            //      1. give a "name" the anchor <a>.
            //      2. use this name to implement the following focus script.
            // str.append(<script language="javascript">a62.focus();</script>);
            if (debug) {
                str.append("<!-- ============================================================= -->\n");
            }
            out.print(str.toString());
        } catch (IOException ioe) {
            JahiaConsole.println("JahiaButton.doStartTag", ioe.toString());
        }
        return SKIP_BODY;
    }

    /**
     * Build an http path containing the server name and port,
     * instead of the path from JahiaPrivateSettings.
     *
     * @return An http path leading to Jahia, built with the server name, and
     *         the server port if nonstandard.
     *
     * FIXME : This method duplicate the method already defined in ServerHttpPathTag
     */
    private final String getServerHttpPath (ParamBean jParams)
    {
        return jParams.getRequest().getContextPath();
    }

    // Taglib parameters
    private String img = "";
    private String href = "";
    private String alt = "";

    // Internal members
    private static long imgID = 0;
    private boolean debug = true;


}