ifdownloadabletag.java

java 写的一个新闻发布系统

package org.jahia.taglibs.field.file;

import org.jahia.data.JahiaData;
import org.jahia.data.files.JahiaFileField;
import org.jahia.exceptions.JahiaException;
import org.jahia.utils.JahiaConsole;

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

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



/**
 * Class IfDownloadableTag : displays the tag body if the enclosing FileFieldTag
 *                           can be downloaded
 *
 * @author  Jerome Tamiotti
 */
public class IfDownloadableTag extends BodyTagSupport {

    public int doAfterBody() {

		ServletRequest request = pageContext.getRequest();
		BodyContent body = getBodyContent();
		try {
			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");
			}
			// retrieves the enclosing file field
			FileFieldTag fileTag = (FileFieldTag) findAncestorWithClass(this, FileFieldTag.class);
			if (fileTag != null) {
				JahiaFileField fileField = fileTag.getFile();
				if (fileField != null){
    				if (fileField.isDownloadable()) {
    					JspWriter out = body.getEnclosingWriter();
    					out.print(body.getString());
    				}
    		    }
			}
		} catch (IOException ioe) {
			JahiaConsole.println("IfDownloadableTag: doAfterBody ", ioe.toString());
   		}
        return SKIP_BODY;
    }
}