com.itextpdf.tool.xml.pipeline.html.HtmlPipeline Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of xmlworker Show documentation
Show all versions of xmlworker Show documentation
Parses XML to PDF, with CSS support, using iText
/*
*
* This file is part of the iText (R) project.
Copyright (c) 1998-2017 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.pipeline.html;
import com.itextpdf.text.Element;
import com.itextpdf.tool.xml.*;
import com.itextpdf.tool.xml.exceptions.LocaleMessages;
import com.itextpdf.tool.xml.exceptions.NoTagProcessorException;
import com.itextpdf.tool.xml.html.TagProcessor;
import com.itextpdf.tool.xml.pipeline.AbstractPipeline;
import com.itextpdf.tool.xml.pipeline.WritableElement;
import java.util.List;
/**
* The HtmlPipeline transforms received tags and content to PDF Elements.
* To configure this pipeline a {@link HtmlPipelineContext}.
*
* @author redlab_b
*
*/
public class HtmlPipeline extends AbstractPipeline {
private final HtmlPipelineContext hpc;
/**
* @param hpc the initial {@link HtmlPipelineContext}
* @param next the next pipe in row
*/
public HtmlPipeline(final HtmlPipelineContext hpc, final Pipeline next) {
super(next);
this.hpc = hpc;
}
/**
* This allows the descendant classes to be fetched from the context.
*/
@Override
public String getContextKey() {
return HtmlPipeline.class.getName();
}
@Override
public Pipeline init(final WorkerContext context) throws PipelineException {
try {
HtmlPipelineContext clone = hpc.clone();
context.put(getContextKey(), clone);
} catch (CloneNotSupportedException e) {
String message = String.format(LocaleMessages.getInstance().getMessage(LocaleMessages.UNSUPPORTED_CLONING),
hpc.getClass().toString());
throw new PipelineException(message, e);
}
return getNext();
}
/*
* (non-Javadoc)
*
* @see com.itextpdf.tool.xml.pipeline.Pipeline#open(com.itextpdf.tool.
* xml.Tag, com.itextpdf.tool.xml.pipeline.ProcessObject)
*/
@Override
public Pipeline open(final WorkerContext context, final Tag t, final ProcessObject po) throws PipelineException {
HtmlPipelineContext hcc = getLocalContext(context);
try {
t.setLastMarginBottom(hcc.getMemory().get(HtmlPipelineContext.LAST_MARGIN_BOTTOM));
hcc.getMemory().remove(HtmlPipelineContext.LAST_MARGIN_BOTTOM);
TagProcessor tp = hcc.resolveProcessor(t.getName(), t.getNameSpace());
addStackKeeper(t, hcc, tp);
List content = tp.startElement(context, t);
if (content.size() > 0) {
if (tp.isStackOwner()) {
StackKeeper peek = hcc.peek();
if (peek == null)
throw new PipelineException(String.format(LocaleMessages.STACK_404, t.toString()));
for (Element elem : content) {
peek.add(elem);
}
} else {
for (Element elem : content) {
hcc.currentContent().add(elem);
if (elem.type() == Element.BODY ){
WritableElement writableElement = new WritableElement();
writableElement.add(elem);
po.add(writableElement);
hcc.currentContent().remove(elem);
}
}
}
}
} catch (NoTagProcessorException e) {
if (!hcc.acceptUnknown()) {
throw e;
}
}
return getNext();
}
/*
* (non-Javadoc)
*
* @see com.itextpdf.tool.xml.pipeline.Pipeline#content(com.itextpdf.tool
* .xml.Tag, java.lang.String, com.itextpdf.tool.xml.pipeline.ProcessObject)
*/
@Override
public Pipeline content(final WorkerContext context, final Tag t, final String text, final ProcessObject po)
throws PipelineException {
HtmlPipelineContext hcc = getLocalContext(context);
TagProcessor tp;
try {
tp = hcc.resolveProcessor(t.getName(), t.getNameSpace());
// String ctn = null;
// if (null != hcc.charSet()) {
// try {
// ctn = new String(b, hcc.charSet().name());
// } catch (UnsupportedEncodingException e) {
// throw new RuntimeWorkerException(LocaleMessages.getInstance().getMessage(
// LocaleMessages.UNSUPPORTED_CHARSET), e);
// }
// } else {
// ctn = new String(b);
// }
List elems = tp.content(context, t, text);
if (elems.size() > 0) {
StackKeeper peek = hcc.peek();
if (peek != null) {
for (Element e : elems) {
peek.add(e);
}
} else {
WritableElement writableElement = new WritableElement();
for (Element elem : elems) {
writableElement.add(elem);
}
po.add(writableElement);
}
}
} catch (NoTagProcessorException e) {
if (!hcc.acceptUnknown()) {
throw e;
}
}
return getNext();
}
/*
* (non-Javadoc)
*
* @see com.itextpdf.tool.xml.pipeline.Pipeline#close(com.itextpdf.tool
* .xml.Tag, com.itextpdf.tool.xml.pipeline.ProcessObject)
*/
@Override
public Pipeline close(final WorkerContext context, final Tag t, final ProcessObject po) throws PipelineException {
HtmlPipelineContext hcc = getLocalContext(context);
TagProcessor tp;
try {
if (t.getLastMarginBottom() != null) {
hcc.getMemory().put(HtmlPipelineContext.LAST_MARGIN_BOTTOM, t.getLastMarginBottom());
} else {
hcc.getMemory().remove(HtmlPipelineContext.LAST_MARGIN_BOTTOM);
}
tp = hcc.resolveProcessor(t.getName(), t.getNameSpace());
List elems = null;
if (tp.isStackOwner()) {
// remove the element from the StackKeeper Queue if end tag is
// found
StackKeeper tagStack;
try {
tagStack = hcc.poll();
} catch (NoStackException e) {
throw new PipelineException(String.format(
LocaleMessages.getInstance().getMessage(LocaleMessages.STACK_404), t.toString()), e);
}
elems = tp.endElement(context, t, tagStack.getElements());
} else {
elems = tp.endElement(context, t, hcc.currentContent());
hcc.currentContent().clear();
}
if (elems.size() > 0) {
StackKeeper stack = hcc.peek();
if (stack != null) {
for (Element elem : elems) {
stack.add(elem);
}
} else {
WritableElement writableElement = new WritableElement();
po.add(writableElement);
writableElement.addAll(elems);
}
}
} catch (NoTagProcessorException e) {
if (!hcc.acceptUnknown()) {
throw e;
}
}
return getNext();
}
protected void addStackKeeper(Tag t, HtmlPipelineContext hcc, TagProcessor tp) {
if (tp.isStackOwner()) {
hcc.addFirst(new StackKeeper(t));
}
}
}