org.sakaiproject.sitestats.impl.report.fop.LibraryURIResolver.java Source code

Introduction

Here is the source code for org.sakaiproject.sitestats.impl.report.fop.LibraryURIResolver.java

Source

/**
 * $URL$
 * $Id$
 *
 * Copyright (c) 2006-2009 The Sakai Foundation
 *
 * Licensed under the Educational Community License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *             http://www.opensource.org/licenses/ECL-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.sakaiproject.sitestats.impl.report.fop;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;

import javax.xml.transform.Source;
import javax.xml.transform.TransformerException;
import javax.xml.transform.URIResolver;
import javax.xml.transform.stream.StreamSource;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.sakaiproject.sitestats.api.StatsManager;

public class LibraryURIResolver implements URIResolver {
    private Log LOG = LogFactory.getLog(LibraryURIResolver.class);
    private final static String LIBRARY_HANDLER = "library://";
    private final static String SITESTATS_HANDLER = "sitestats://";
    private String libraryRoot = null;
    private String sitestatsRoot = null;

    public LibraryURIResolver() {
        this.libraryRoot = getLibraryRoot();
        this.sitestatsRoot = getSitestatsRoot();
    }

    public Source resolve(String href, String base) throws TransformerException {
        if ((href.startsWith(LIBRARY_HANDLER) && libraryRoot != null)
                || (href.startsWith(SITESTATS_HANDLER) && sitestatsRoot != null)) {
            String resource = null;
            String fullResource = null;
            if (href.startsWith(LIBRARY_HANDLER)) {
                resource = href.substring(LIBRARY_HANDLER.length()); // chop off the library://
                fullResource = libraryRoot + resource;
            }
            if (href.startsWith(SITESTATS_HANDLER)) {
                resource = href.substring(SITESTATS_HANDLER.length()); // chop off the sitestats://
                String webappStartDir = StatsManager.SITESTATS_WEBAPP;
                if (resource.startsWith(webappStartDir)) {
                    resource = resource.substring(webappStartDir.length());
                }
                fullResource = sitestatsRoot + resource;
            }
            FileInputStream fis = null;
            StreamSource ss = null;
            try {
                fis = new FileInputStream(fullResource);
                ss = new StreamSource(fis, resource);
                return ss;
            } catch (FileNotFoundException e) {
                throw new TransformerException(e);
            } finally {
                // If FileInputStream is closed as suggested by FindBugs, code doesn't work!
                /*
                 * if(fis != null) { try{ fis.close(); }catch(IOException e){
                 * LOG.debug("Unable to read library image: "+href); } }
                 */
            }
        } else {
            return null;
        }
    }

    private String getLibraryRoot() {
        String path = null;
        try {
            // get library folder
            String catalina = System.getProperty("catalina.base");
            if (catalina == null) {
                catalina = System.getProperty("catalina.home");
            }
            StringBuilder buff = new StringBuilder(catalina);
            buff.append(File.separatorChar);
            buff.append("webapps");
            buff.append(File.separatorChar);
            buff.append("library");
            buff.append(File.separatorChar);
            path = buff.toString();
        } catch (Exception e) {
            path = null;
        }
        return path;
    }

    private String getSitestatsRoot() {
        String path = null;
        try {
            // get library folder
            String catalina = System.getProperty("catalina.base");
            if (catalina == null) {
                catalina = System.getProperty("catalina.home");
            }
            StringBuilder buff = new StringBuilder(catalina);
            buff.append(File.separatorChar);
            buff.append("webapps");
            buff.append(StatsManager.SITESTATS_WEBAPP);
            buff.append(File.separatorChar);
            path = buff.toString();
        } catch (Exception e) {
            path = null;
        }
        return path;
    }
}