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/*
* Copyright 1999-2004 The Apache Software Foundation.
*
* Licensed 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 org.apache.fop.apps.FOPException;
import org.apache.fop.apps.FOUserAgent;
import org.apache.fop.fonts.FontInfo;
import java.util.Map;
import java.util.HashMap;
import java.util.Iterator;
import java.io.File;
import java.io.FileOutputStream;
import java.io.FileInputStream;
import java.io.ObjectOutputStream;
import java.io.ObjectInputStream;
import java.io.OutputStream;
import java.io.BufferedOutputStream;
import java.io.BufferedInputStream;
/**
* 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();
/**
* Constructor
* @see org.apache.fop.area.RenderPagesModel#RenderPagesModel(FOUserAgent, int, FontInfo, OutputStream)
*/
public CachedRenderPagesModel (FOUserAgent userAgent, int renderType,
FontInfo fontInfo, OutputStream stream) throws FOPException {
super(userAgent, renderType, fontInfo, stream);
}
/**
* @see org.apache.fop.area.RenderPagesModel#checkPreparedPages(PageViewport, boolean)
*/
protected boolean checkPreparedPages(PageViewport newpage, boolean renderUnresolved) {
for (Iterator iter = prepared.iterator(); iter.hasNext();) {
PageViewport p = (PageViewport)iter.next();
if (p.isResolved() || renderUnresolved) {
if (p != newpage) {
try {
// load page from cache
String name = (String)pageMap.get(p);
File temp = new File(name);
System.out.println("page serialized to: " + temp.length());
ObjectInputStream in = new ObjectInputStream(
new BufferedInputStream(
new FileInputStream(temp)));
p.loadPage(in);
in.close();
temp.delete();
pageMap.remove(p);
} catch (Exception e) {
e.printStackTrace();
}
}
try {
renderer.renderPage(p);
if (!p.isResolved()) {
String[] idrefs = p.getIDRefs();
for (int count = 0; count < idrefs.length; count++) {
log.warn("Page " + p.getPageNumberString() +
": Unresolved id reference \"" + idrefs[count]
+ "\" found.");
}
}
} catch (Exception e) {
// use error handler to handle this FOP or IO Exception
e.printStackTrace();
}
p.clear();
iter.remove();
} else {
if (!renderer.supportsOutOfOrder()) {
break;
}
}
}
if (newpage != null && newpage.getPage() != null) {
savePage(newpage);
}
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 = "page" + page.toString() + ".ser";
tempstream = new ObjectOutputStream(new BufferedOutputStream(
new FileOutputStream(fname)));
page.savePage(tempstream);
tempstream.close();
pageMap.put(page, fname);
} catch (Exception e) {
e.printStackTrace();
}
}
}
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