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Parses XML to PDF, with CSS support, using iText
/*
* $Id: 1e6ba4f495ac4d0934f5e6487b94f518acee67e2 $
*
* This file is part of the iText (R) project.
* Copyright (c) 1998-2015 iText Group NV
* Authors: Balder Van Camp, Emiel Ackermann, et al.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License version 3
* as published by the Free Software Foundation with the addition of the
* following permission added to Section 15 as permitted in Section 7(a):
* FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY
* ITEXT GROUP. ITEXT GROUP DISCLAIMS THE WARRANTY OF NON INFRINGEMENT
* OF THIRD PARTY RIGHTS.
*
* This program 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 Affero General Public License for more
* details. You should have received a copy of the GNU Affero General Public
* License along with this program; if not, see http://www.gnu.org/licenses or
* write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA, 02110-1301 USA, or download the license from the following URL:
* http://itextpdf.com/terms-of-use/
*
* The interactive user interfaces in modified source and object code versions
* of this program must display Appropriate Legal Notices, as required under
* Section 5 of the GNU Affero General Public License.
*
* In accordance with Section 7(b) of the GNU Affero General Public License, a
* covered work must retain the producer line in every PDF that is created or
* manipulated using iText.
*
* You can be released from the requirements of the license by purchasing a
* commercial license. Buying such a license is mandatory as soon as you develop
* commercial activities involving the iText software without disclosing the
* source code of your own applications. These activities include: offering paid
* services to customers as an ASP, serving PDFs on the fly in a web
* application, shipping iText with a closed source product.
*
* For more information, please contact iText Software Corp. at this address:
* [email protected]
*/
package com.itextpdf.tool.xml;
import com.itextpdf.tool.xml.exceptions.LocaleMessages;
import com.itextpdf.tool.xml.exceptions.RuntimeWorkerException;
import com.itextpdf.tool.xml.parser.XMLParserListener;
import com.itextpdf.tool.xml.pipeline.ctx.WorkerContextImpl;
import java.util.Map;
/**
* The implementation of the {@link XMLParserListener}.
* Important Note: This class the XMLWorker stores the
* {@link WorkerContext} (Which is a {@link WorkerContextImpl}) in a ThreadLocal
* variable, WorkerContext is confined to threads here.
*
* @author redlab_b
*
*/
public class XMLWorker implements XMLParserListener {
protected final Pipeline rootpPipe;
private static ThreadLocal context = new ThreadLocal() {
@Override
protected WorkerContextImpl initialValue() {
return new WorkerContextImpl();
};
};
protected final boolean parseHtml;
/**
* Constructs a new XMLWorker
*
* @param pipeline the pipeline
* @param parseHtml true if this XMLWorker is parsing HTML, this actually
* just means: convert all tags to lowercase.
*/
public XMLWorker(final Pipeline pipeline, final boolean parseHtml) {
this.parseHtml = parseHtml;
rootpPipe = pipeline;
}
public void init() {
Pipeline p = rootpPipe;
try {
while ((p = p.init(getLocalWC()))!= null);
} catch (PipelineException e) {
throw new RuntimeWorkerException(e);
}
}
public void startElement(final String tag, final Map attr, final String ns) {
Tag t = createTag(tag, attr, ns);
WorkerContext ctx = getLocalWC();
if (null != ctx.getCurrentTag()) {
ctx.getCurrentTag().addChild(t);
}
ctx.setCurrentTag(t);
Pipeline wp = rootpPipe;
ProcessObject po = new ProcessObject();
try {
while (null != (wp = wp.open(ctx, t, po)))
;
} catch (PipelineException e) {
throw new RuntimeWorkerException(e);
}
}
/**
* Creates a new Tag object from the given parameters.
* @param tag the tag name
* @param attr the attributes
* @param ns the namespace if any
* @return a Tag
*/
protected Tag createTag(String tag, final Map attr, final String ns) {
if (parseHtml) {
tag = tag.toLowerCase();
}
Tag t = new Tag(tag, attr, ns);
return t;
}
public void endElement(final String tag, final String ns) {
String thetag = null;
if (parseHtml) {
thetag = tag.toLowerCase();
} else {
thetag = tag;
}
WorkerContext ctx = getLocalWC();
if (null != ctx.getCurrentTag() && !thetag.equals(ctx.getCurrentTag().getName())) {
throw new RuntimeWorkerException(String.format(
LocaleMessages.getInstance().getMessage(LocaleMessages.INVALID_NESTED_TAG), thetag,
ctx.getCurrentTag().getName()));
}
Pipeline wp = rootpPipe;
ProcessObject po = new ProcessObject();
try {
while (null != (wp = wp.close(ctx, ctx.getCurrentTag(), po)))
;
} catch (PipelineException e) {
throw new RuntimeWorkerException(e);
} finally {
if (null != ctx.getCurrentTag())
ctx.setCurrentTag(ctx.getCurrentTag().getParent());
}
}
/**
* This method passes encountered text to the pipeline via the
* {@link Pipeline#content(WorkerContext, Tag, String, ProcessObject)}
* method.
*/
public void text(String text) {
if (text.startsWith("")) {
if (ignoreCdata())
return;
else
text = text.substring(9, text.length() - 3);
}
WorkerContext ctx = getLocalWC();
if (null != ctx.getCurrentTag()) {
if (text.length() > 0) {
Pipeline wp = rootpPipe;
ProcessObject po = new ProcessObject();
try {
while (null != (wp = wp.content(ctx, ctx.getCurrentTag(), text, po)))
;
} catch (PipelineException e) {
throw new RuntimeWorkerException(e);
}
}
}
}
/*
* (non-Javadoc)
*
* @see
* com.itextpdf.tool.xml.parser.ParserListener#unknownText(java.lang.String)
*/
public void unknownText(final String text) {
// TODO unknown text encountered
}
/*
* (non-Javadoc)
*
* @see
* com.itextpdf.tool.xml.parser.ParserListener#comment(java.lang.String)
*/
public void comment(final String comment) {
// TODO xml comment encountered
}
/* (non-Javadoc)
* @see com.itextpdf.tool.xml.parser.XMLParserListener#close()
*/
public void close() {
closeLocalWC();
}
/**
* Returns the current tag.
* @return the current tag
*/
protected Tag getCurrentTag() {
return getLocalWC().getCurrentTag();
}
/**
* Returns the local WorkerContext, beware: could be a newly initialized
* one, if {@link XMLWorker#close()} or {@link XMLWorker#closeLocalWC()} has been called before.
*
* @return the local WorkerContext
*/
protected static WorkerContext getLocalWC() {
return context.get();
}
protected static void closeLocalWC() {
context.remove();
}
protected boolean ignoreCdata() {
return true;
}
}