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/**
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* Alt2XML
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* Copyright © 2014 František Kučera (frantovo.cz)
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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, version 3 of the License.
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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, see <http://www.gnu.org/licenses/>.
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*/
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package cz.frantovo.alt2xml;
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import java.util.Deque;
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import java.util.HashMap;
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import java.util.LinkedList;
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import java.util.Map;
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import java.util.Map.Entry;
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import java.util.ServiceLoader;
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import javax.xml.parsers.FactoryConfigurationError;
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import javax.xml.parsers.ParserConfigurationException;
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import javax.xml.parsers.SAXParser;
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import javax.xml.parsers.SAXParserFactory;
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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.XMLReader;
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/**
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*
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* @author Ing. František Kučera (frantovo.cz)
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*/
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public class ParserFactory extends SAXParserFactory implements ReaderFinder {
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private final Deque<Alt2XmlReaderFactory> readerFactories = new LinkedList();
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/**
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* @see #DEFAULT_FACTORY_PROPERTY
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*/
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private SAXParserFactory fallbackFactory;
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/**
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* System property which contains SAXParserFactory class name for XML.
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* Will be used as fallback if no alternative factory matches systemId to be parsed.
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*/
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public static final String DEFAULT_FACTORY_PROPERTY = "cz.frantovo.alt2xml.fallback.javax.xml.parsers.SAXParserFactory";
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private final Map<String, Boolean> features = new HashMap<>();
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public ParserFactory() {
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super();
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for (Alt2XmlReaderFactory f : ServiceLoader.load(Alt2XmlReaderFactory.class)) {
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readerFactories.add(f);
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}
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readerFactories.add(new FallbackReaderFactory());
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}
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/**
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* @return factory to be used for XML documents (default/fallback)
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* @throws FactoryConfigurationError if fallback factory is the same one as this – avoid
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* infinite recursion.
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*/
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public SAXParserFactory getFallbackFactory() {
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if (fallbackFactory == null) {
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String className = System.getProperty(DEFAULT_FACTORY_PROPERTY);
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if (className == null) {
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fallbackFactory = SAXParserFactory.newInstance();
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} else {
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fallbackFactory = SAXParserFactory.newInstance(className, null);
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}
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}
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if (fallbackFactory.getClass().equals(getClass())) {
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throw new FactoryConfigurationError("Fallback factory is the same class as this one – avoid infinite recursion: " + getClass());
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} else {
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return fallbackFactory;
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}
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}
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public void setFallbackFactory(SAXParserFactory fallbackFactory) {
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this.fallbackFactory = fallbackFactory;
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}
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private class FallbackReaderFactory implements Alt2XmlReaderFactory {
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@Override
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public boolean canRead(AltInputSource inputSource) {
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return true;
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}
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@Override
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public XMLReader getReader() throws SAXException {
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try {
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return getFallbackFactory().newSAXParser().getXMLReader();
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} catch (ParserConfigurationException e) {
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throw new SAXException("Unable to instantiate the fallback factory.", e);
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}
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}
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}
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@Override
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public XMLReader findReader(AltInputSource inputSource) throws SAXException {
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for (Alt2XmlReaderFactory f : readerFactories) {
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if (f.canRead(inputSource)) {
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return f.getReader();
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}
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}
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throw new SAXException("Iterated over " + readerFactories.size() + " and was unable to find XMLReader for SystemId: " + inputSource);
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}
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@Override
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public SAXParser newSAXParser() throws ParserConfigurationException, SAXException {
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SuperReader r = new SuperReader(this);
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for (Entry<String, Boolean> f : features.entrySet()) {
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r.setFeature(f.getKey(), f.getValue());
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}
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return new AltSAXParser(r);
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}
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@Override
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public void setFeature(String name, boolean value) throws ParserConfigurationException, SAXNotRecognizedException, SAXNotSupportedException {
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features.put(name, value);
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}
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@Override
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public boolean getFeature(String name) throws ParserConfigurationException, SAXNotRecognizedException, SAXNotSupportedException {
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return features.get(name);
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}
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}
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