Java tutorial
/* * * This file is part of the iText (R) project. Copyright (c) 1998-2019 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: * sales@itextpdf.com */ 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.<br /> * To configure this pipeline a {@link HtmlPipelineContext}. * * @author redlab_b * */ public class HtmlPipeline extends AbstractPipeline<HtmlPipelineContext> { 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<Element> 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<Element> 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<Element> 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)); } } }