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120 lines
3.7 KiB
120 lines
3.7 KiB
// OOXMLSharedStringsHandler.java
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// ---------------------------
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// Copyright 2017 by luccioman; https://github.com/luccioman
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//
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// This is a part of YaCy, a peer-to-peer based web search engine
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//
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// LICENSE
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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package net.yacy.document.parser.xml;
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import java.io.IOException;
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import java.util.List;
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import org.apache.commons.io.input.ClosedInputStream;
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import org.xml.sax.Attributes;
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import org.xml.sax.InputSource;
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import org.xml.sax.SAXException;
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import org.xml.sax.helpers.DefaultHandler;
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/**
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* SAX handler for Office Open XML SpreadSheet xl/sharedStrings.xml files.
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*
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* @author luccioman
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* @see <a href=
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* "http://www.ecma-international.org/publications/standards/Ecma-376.htm">Ecma
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* Standard for Office Open XML File Formats</a>
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*
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*/
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public class OOXMLSharedStringsHandler extends DefaultHandler {
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/** The entry name of a shared strings table in an OOXML container */
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public static final String ENTRY_NAME = "xl/sharedStrings.xml";
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/** Name of a shared string tag */
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private static final String SHARED_STRING_TAG = "t";
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/** Shared strings list */
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private final List<String> sharedStrings;
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/** Currently parsed string builder. */
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private StringBuilder currentString;
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/**
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* @param sharedStrings
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* the mutable list of shared strings to fill
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* @throws IllegalArgumentException
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* when a parameter is null
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*/
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public OOXMLSharedStringsHandler(final List<String> sharedStrings) throws IllegalArgumentException {
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if (sharedStrings == null) {
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throw new IllegalArgumentException("sharedStrings list must not be null");
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}
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this.sharedStrings = sharedStrings;
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}
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/**
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* @return an empty source to prevent the SAX parser opening an unwanted
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* connection to resolve an external entity
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*/
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@Override
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public InputSource resolveEntity(String publicId, String systemId) throws IOException, SAXException {
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return new InputSource(new ClosedInputStream());
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}
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@Override
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public void startDocument() throws SAXException {
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this.currentString = new StringBuilder();
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}
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@Override
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public void startElement(final String uri, final String localName, final String qName, final Attributes attributes)
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throws SAXException {
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if (SHARED_STRING_TAG.equals(qName)) {
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this.currentString.setLength(0);
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}
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}
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/**
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* Append characters to the current string builder. May be called multiple times
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* before obtaining the whole current element string.
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*/
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@Override
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public void characters(final char ch[], final int start, final int length) throws SAXException {
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this.currentString.append(ch, start, length);
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}
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/**
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* Add the current string content to the list when ending a shared string
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* element
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*/
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@Override
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public void endElement(String uri, String localName, String qName) throws SAXException {
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if (SHARED_STRING_TAG.equals(qName)) {
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final String sharedString = this.currentString.toString();
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this.sharedStrings.add(sharedString);
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this.currentString.setLength(0);
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}
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}
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@Override
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public void endDocument() throws SAXException {
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/* Release the StringBuilder now useless */
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this.currentString = null;
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}
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} |