001/*
002 * (C) Copyright 2008 JBoss and others.
003 *
004 * All rights reserved. This program and the accompanying materials
005 * are made available under the terms of the GNU Lesser General Public License
006 * (LGPL) version 2.1 which accompanies this distribution, and is available at
007 * http://www.gnu.org/licenses/lgpl.html
008 *
009 * This library is distributed in the hope that it will be useful,
010 * but WITHOUT ANY WARRANTY; without even the implied warranty of
011 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
012 * Lesser General Public License for more details.
013 *
014 * Contributors:
015 *     Original file from org.jboss.seam.pdf.ui.UIHtmlText.java in jboss-seam-pdf
016 *     Anahide Tchertchian
017 */
018package org.nuxeo.ecm.platform.ui.web.component.seam;
019
020import java.io.IOException;
021import java.io.StringReader;
022import java.io.StringWriter;
023import java.util.HashMap;
024
025import javax.faces.context.FacesContext;
026import javax.faces.context.ResponseWriter;
027import javax.servlet.http.HttpServletRequest;
028
029import org.apache.commons.logging.Log;
030import org.apache.commons.logging.LogFactory;
031import org.jboss.seam.ui.util.JSF;
032
033import com.lowagie.text.html.simpleparser.HTMLWorker;
034import com.lowagie.text.html.simpleparser.StyleSheet;
035
036/**
037 * Overrides basic p:html tag to use {@link NuxeoITextImageProvider} to resolve image resources.
038 *
039 * @since 5.4.2
040 */
041public class UIHtmlText extends org.jboss.seam.pdf.ui.UIHtmlText {
042
043    private static final Log log = LogFactory.getLog(UIHtmlText.class);
044
045    @Override
046    public void encodeChildren(FacesContext context) throws IOException {
047        ResponseWriter writer = context.getResponseWriter();
048
049        StringWriter stringWriter = new StringWriter();
050        ResponseWriter cachingResponseWriter = writer.cloneWithWriter(stringWriter);
051        context.setResponseWriter(cachingResponseWriter);
052        JSF.renderChildren(context, this);
053        context.setResponseWriter(writer);
054
055        String output = stringWriter.getBuffer().toString();
056        addFromHtml(output, context);
057    }
058
059    @Override
060    public void encodeEnd(FacesContext context) throws IOException {
061        Object value = getValue();
062        if (value != null) {
063            addFromHtml(convert(context, value), context);
064        }
065        super.encodeEnd(context);
066    }
067
068    private void addFromHtml(String html, FacesContext context) {
069        HashMap<String, Object> interfaceProps = new HashMap<String, Object>();
070        interfaceProps.put("img_provider", new NuxeoITextImageProvider(
071                (HttpServletRequest) context.getExternalContext().getRequest()));
072
073        try {
074            for (Object o : HTMLWorker.parseToList(new StringReader(html), getStyle(), interfaceProps)) {
075                addToITextParent(o);
076            }
077        } catch (IOException e) {
078            // XXX avoid crash when rendering an image with resource not found
079            log.error("Error converting HTML to PDF", e);
080        }
081    }
082
083    /**
084     * XXX - this needs some work
085     */
086    private StyleSheet getStyle() {
087        StyleSheet styles = new StyleSheet();
088        styles.loadTagStyle("body", "leading", "16,0");
089        return styles;
090    }
091
092}