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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache 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.apache.org/licenses/LICENSE-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.
*/
/* $Id$ */
package org.apache.fop.area;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.OutputStream;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import org.xml.sax.SAXException;
import org.apache.commons.io.IOUtils;
import org.apache.fop.apps.FOPException;
import org.apache.fop.apps.FOUserAgent;
import org.apache.fop.events.ResourceEventProducer;
import org.apache.fop.fonts.FontInfo;
/**
* A simple cached render pages model.
* If the page is prepared for later rendering then this saves
* the page contents to a file and once the page is resolved
* the contents are reloaded.
*/
public class CachedRenderPagesModel extends RenderPagesModel {
private Map pageMap = new HashMap();
/** Base directory to save temporary file in, typically points to the user's temp dir. */
protected File baseDir;
/**
* Main Constructor
* @param userAgent FOUserAgent object for process
* @param outputFormat the MIME type of the output format to use (ex. "application/pdf").
* @param fontInfo FontInfo object
* @param stream OutputStream
* @throws FOPException if the renderer cannot be properly initialized
*/
public CachedRenderPagesModel (FOUserAgent userAgent, String outputFormat,
FontInfo fontInfo, OutputStream stream) throws FOPException {
super(userAgent, outputFormat, fontInfo, stream);
this.baseDir = new File(System.getProperty("java.io.tmpdir"));
}
/**
* {@inheritDoc}
*/
protected boolean checkPreparedPages(PageViewport newpage, boolean renderUnresolved) {
for (Iterator iter = prepared.iterator(); iter.hasNext();) {
PageViewport pageViewport = (PageViewport)iter.next();
if (pageViewport.isResolved() || renderUnresolved) {
if (pageViewport != newpage) {
try {
// load page from cache
String name = (String)pageMap.get(pageViewport);
File tempFile = new File(baseDir, name);
log.debug("Loading page from: " + tempFile);
ObjectInputStream in = new ObjectInputStream(
new BufferedInputStream(
new FileInputStream(tempFile)));
try {
pageViewport.loadPage(in);
} finally {
IOUtils.closeQuietly(in);
}
if (!tempFile.delete()) {
ResourceEventProducer eventProducer
= ResourceEventProducer.Provider.get(
renderer.getUserAgent().getEventBroadcaster());
eventProducer.cannotDeleteTempFile(this, tempFile);
}
pageMap.remove(pageViewport);
} catch (Exception e) {
AreaEventProducer eventProducer
= AreaEventProducer.Provider.get(
renderer.getUserAgent().getEventBroadcaster());
eventProducer.pageLoadError(this, pageViewport.getPageNumberString(), e);
}
}
renderPage(pageViewport);
pageViewport.clear();
iter.remove();
} else {
if (!renderer.supportsOutOfOrder()) {
break;
}
}
}
if (newpage != null && newpage.getPage() != null) {
savePage(newpage);
newpage.clear();
}
return renderer.supportsOutOfOrder() || prepared.isEmpty();
}
/**
* Save a page.
* It saves the contents of the page to a file.
*
* @param page the page to prepare
*/
protected void savePage(PageViewport page) {
try {
// save page to cache
ObjectOutputStream tempstream;
String fname = "fop-page-" + page.toString() + ".ser";
File tempFile = new File(baseDir, fname);
tempFile.deleteOnExit();
tempstream = new ObjectOutputStream(new BufferedOutputStream(
new FileOutputStream(tempFile)));
try {
page.savePage(tempstream);
} finally {
IOUtils.closeQuietly(tempstream);
}
pageMap.put(page, fname);
if (log.isDebugEnabled()) {
log.debug("Page saved to temporary file: " + tempFile);
}
} catch (IOException ioe) {
AreaEventProducer eventProducer
= AreaEventProducer.Provider.get(
renderer.getUserAgent().getEventBroadcaster());
eventProducer.pageSaveError(this, page.getPageNumberString(), ioe);
}
}
/** {@inheritDoc} */
public void endDocument() throws SAXException {
super.endDocument();
}
}
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