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/**
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franta-hg@43
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* Alt2XML
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franta-hg@43
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* Copyright © 2014 František Kučera (frantovo.cz)
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franta-hg@43
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*
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* This program is free software: you can redistribute it and/or modify
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franta-hg@43
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* it under the terms of the GNU General Public License as published by
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franta-hg@43
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* the Free Software Foundation, either version 3 of the License, or
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franta-hg@43
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* (at your option) any later version.
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franta-hg@43
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*
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* This program is distributed in the hope that it will be useful,
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franta-hg@43
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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franta-hg@43
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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franta-hg@43
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* GNU General Public License for more details.
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franta-hg@43
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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, see <http://www.gnu.org/licenses/>.
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*/
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package cz.frantovo.alt2xml.out;
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import java.io.IOException;
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import java.util.logging.Level;
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import java.util.logging.Logger;
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import javax.xml.parsers.SAXParser;
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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.SAXNotRecognizedException;
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import org.xml.sax.SAXNotSupportedException;
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import org.xml.sax.ext.LexicalHandler;
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import org.xml.sax.helpers.DefaultHandler;
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/**
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franta-hg@45
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* Recommended base class for Actions based on handlers.
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*
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* @author Ing. František Kučera (frantovo.cz)
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*/
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public abstract class AbstractHandlerAction extends AbstractAction {
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private static final Logger log = Logger.getLogger(AbstractHandlerAction.class.getName());
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public static final String LEXICAL_HANDLER_PROPERTY = "http://xml.org/sax/properties/lexical-handler";
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public AbstractHandlerAction(ActionContext actionContext) {
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super(actionContext);
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}
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public abstract DefaultHandler getDefaultHandler();
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/**
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* For e.g. comment nodes.
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*
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* @return may return null if this output module does not support lexical events
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*/
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public LexicalHandler getLexicalHandler() {
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return null;
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}
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@Override
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public void run(SAXParser parser, InputSource source) throws OutputActionException {
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DefaultHandler defaultHandler = getDefaultHandler();
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LexicalHandler lexicalHandler = getLexicalHandler();
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if (lexicalHandler == null) {
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log.log(Level.FINE, "No LexicalHandler provided → no comment nodes etc. on output.");
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} else {
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try {
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parser.setProperty(LEXICAL_HANDLER_PROPERTY, lexicalHandler);
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} catch (SAXNotRecognizedException | SAXNotSupportedException e) {
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log.log(Level.WARNING, "LexicalHandler registration exception:", e);
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log.log(Level.WARNING,
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"Tried to register the handler {0} as a LexicalHandler but LexicalHandlers are not supported by the parser {1}",
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new Object[]{lexicalHandler, parser});
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}
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}
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try {
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parser.parse(source, defaultHandler);
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} catch (IOException | SAXException e) {
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throw new OutputActionException("Error while parsing document: " + source, e);
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}
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}
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}
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