ifimagetag.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 IfImageTag : checks if the enclosing FileFieldTag is an image
 *
 * @author  Jerome Tamiotti
 */
public class IfImageTag 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 (isImage(fileField)) {
					JspWriter out = body.getEnclosingWriter();
					out.print(body.getString());
				}
			}
		} catch (IOException ioe) {
			JahiaConsole.println("IfImageTag: doAfterBody ", ioe.toString());
   		}
        return SKIP_BODY;
    }


    private boolean isImage( JahiaFileField theFile ) {
        if (theFile != null) {
            if (theFile.getType().equals("")) {
                // not set yet, so test the default value of the tag
                String name = theFile.getDownloadUrl();
                if (name != null) {
                    name = name.toUpperCase();
                    return ((name.indexOf("JPG") != -1) ||
                            (name.indexOf("PNG") != -1) ||
                            (name.indexOf("GIF") != -1) ||
                            (name.indexOf("JPEG") != -1));
                }
            } else {
                // the file field has already been set up
                // so perform the real test
                return theFile.getType().startsWith("image");
            }
        }
        return false;
    }

}