cmsdownloadbrowser.java

java 编写的程序

/*
* File   : $Source: /usr/local/cvs/opencms/src/com/opencms/workplace/CmsDownloadBrowser.java,v $
* Date   : $Date: 2001/07/31 15:50:18 $
* Version: $Revision: 1.15 $
*
* This library is part of OpenCms -
* the Open Source Content Mananagement System
*
* Copyright (C) 2001  The OpenCms Group
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
* Lesser General Public License for more details.
*
* For further information about OpenCms, please see the
* OpenCms Website: http://www.opencms.org 
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/


package com.opencms.workplace;

import com.opencms.file.*;
import com.opencms.core.*;
import com.opencms.util.*;
import com.opencms.template.*;
import java.util.*;
import javax.servlet.http.*;

/**
 * Template class for displaying OpenCms download browser.
 * <P>
 *
 * @author Mario Stanke
 * @version $Revision: 1.15 $ $Date: 2001/07/31 15:50:18 $
 * @see com.opencms.workplace.CmsXmlWpTemplateFile
 */

public class CmsDownloadBrowser extends CmsWorkplaceDefault implements I_CmsFileListUsers {

    /**
     * Gets the content of a defined section in a given template file and its subtemplates
     * with the given parameters.
     *
     * @see getContent(CmsObject cms, String templateFile, String elementName, Hashtable parameters)
     * @param cms CmsObject Object for accessing system resources.
     * @param templateFile Filename of the template file.
     * @param elementName Element name of this template in our parent template.
     * @param parameters Hashtable with all template class parameters.
     * @param templateSelector template section that should be processed.
     */

    public byte[] getContent(CmsObject cms, String templateFile, String elementName, Hashtable parameters, String templateSelector) throws CmsException {
        if(I_CmsLogChannels.C_PREPROCESSOR_IS_LOGGING && A_OpenCms.isLogging() && C_DEBUG) {
            A_OpenCms.log(C_OPENCMS_DEBUG, getClassName() + "getting content of element "
                    + ((elementName == null) ? "<root>" : elementName));
            A_OpenCms.log(C_OPENCMS_DEBUG, getClassName() + "template file is: "
                    + templateFile);
            A_OpenCms.log(C_OPENCMS_DEBUG, getClassName() + "selected template section is: "
                    + ((templateSelector == null) ? "<default>" : templateSelector));
        }
        I_CmsSession session = cms.getRequestContext().getSession(true);
        CmsXmlWpTemplateFile xmlTemplateDocument = (CmsXmlWpTemplateFile)getOwnTemplateFile(cms,
                templateFile, elementName, parameters, templateSelector);

        // test whether the download folder exists at all
        try {
            cms.readFileHeader(getConfigFile(cms).getDownGalleryPath());
        }
        catch(CmsException e) {
            xmlTemplateDocument.setData("ERRORDETAILS", Utils.getStackTrace(e));
            templateSelector = "error";
        }
        if(!"error".equals(templateSelector)) {

            // clear session parameters of first load
            if(parameters.get(C_PARA_INITIAL) != null) {
                session.removeValue(C_PARA_FOLDER);
                session.removeValue(C_PARA_PAGE);
                session.removeValue("_DOWNLIST_");
                session.removeValue(C_PARA_FILTER);
                session.removeValue("numfiles");
                session.removeValue("lasturl");
            }

            // most parameters have to be stored in the session because 'getFiles' needs them
            String folder = (String)parameters.get(C_PARA_FOLDER);
            if(folder != null) {
                session.putValue(C_PARA_FOLDER, folder);
            }
            folder = (String)session.getValue(C_PARA_FOLDER);
            if(folder == null || "".equals(folder)) {
                folder = getConfigFile(cms).getDownGalleryPath();
                Vector galleries = cms.getSubFolders(folder);
                if(galleries.size() > 0) {

                    // take the first gallery
                    folder = ((CmsResource)galleries.elementAt(0)).getAbsolutePath();
                    session.putValue(C_PARA_FOLDER, folder);
                }
                else {

                    // there was a /download/ - folder but no gallery in it
                    templateSelector = "error_no_gallery";
                }
            }
            if(!"error_no_gallery".equals(templateSelector)) {
                String pageText = (String)parameters.get(C_PARA_PAGE);
                String filter = (String)parameters.get(C_PARA_FILTER);

                // Check if the user requested a certain page number
                if(pageText == null || "".equals(pageText)) {
                    pageText = "1";
                    parameters.put(C_PARA_PAGE, pageText);
                }
                session.putValue(C_PARA_PAGE, pageText);

                // Check if the user requested a filter
                if(filter == null) {
                    filter = "";
                    session.putValue(C_PARA_FILTER, filter);
                    parameters.put(C_PARA_FILTER, filter);
                }

                // Compute the maximum page number
                Vector filteredFiles = getFilteredDownList(cms, folder, filter);
                int maxpage = ((filteredFiles.size() - 1) / C_DOWNBROWSER_MAXENTRIES) + 1;

                // Now set the appropriate datablocks
                xmlTemplateDocument.setData(C_PARA_FOLDER, Encoder.escape(folder));
                xmlTemplateDocument.setData(C_PARA_PAGE, pageText);
                xmlTemplateDocument.setData(C_PARA_FILTER, filter);
                xmlTemplateDocument.setData(C_PARA_MAXPAGE, "" + maxpage);
                session.putValue("_DOWNLIST_", filteredFiles);
                session.putValue("numfiles", new Integer(filteredFiles.size())); // for 'showNextButton'
            }
        }

        // Start the processing
        return startProcessing(cms, xmlTemplateDocument, elementName, parameters,
                templateSelector);
    }

    /**
     * From interface <code>I_CmsFileListUsers</code>.
     * <P>
     * Fills all customized columns with the appropriate settings for the given file
     * list entry. Any column filled by this method may be used in the customized template
     * for the file list.
     * @param cms Cms object for accessing system resources.
     * @param filelist Template file containing the definitions for the file list together with
     * the included customized defintions.
     * @param res CmsResource Object of the current file list entry.
     * @param lang Current language file.
     * @exception CmsException if access to system resources failed.
     * @see I_CmsFileListUsers
     */

    public void getCustomizedColumnValues(CmsObject cms, CmsXmlWpTemplateFile filelistTemplate,
            CmsResource res, CmsXmlLanguageFile lang) throws CmsException {
        String servletPath = cms.getRequestContext().getRequest().getServletUrl();
        String downloadPath = servletPath + res.getAbsolutePath();
        filelistTemplate.setData("fullpath", downloadPath);
        filelistTemplate.setData("name_value", res.getName());
        String title = "";
        try {
            title = cms.readProperty(res.getAbsolutePath(), C_PROPERTY_TITLE);
        }
        catch(CmsException e) {

        }
        if(title == null) {
            title = "";
        }
        filelistTemplate.setData("title_value", title);
    }

    public Integer getDownGalleryNames(CmsObject cms, CmsXmlLanguageFile lang, Vector names,
            Vector values, Hashtable parameters) throws CmsException {
        int ret = -1;
        I_CmsSession session = cms.getRequestContext().getSession(true);

        // which folder is the gallery?
        String chosenFolder = (String)parameters.get(C_PARA_FOLDER);
        if(chosenFolder == null) {
            chosenFolder = (String)session.getValue(C_PARA_FOLDER);
        }
        if(chosenFolder == null) {
            chosenFolder = "";
        }
        Vector folders = cms.getSubFolders(getConfigFile(cms).getDownGalleryPath());
        int numFolders = folders.size();