| /* ImplementationSource.java -- |
| Copyright (C) 2004 Free Software Foundation, Inc.. |
| |
| This file is part of GNU Classpath. |
| |
| GNU Classpath is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2, or (at your option) |
| any later version. |
| |
| GNU Classpath 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 |
| General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GNU Classpath; see the file COPYING. If not, write to the |
| Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 USA. |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| package gnu.xml.dom; |
| |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.Iterator; |
| import java.util.List; |
| |
| import org.w3c.dom.DOMImplementation; |
| import org.w3c.dom.DOMImplementationList; |
| import org.w3c.dom.DOMImplementationSource; |
| |
| /** |
| * Implementation source for GNU JAXP. |
| * |
| * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a> |
| */ |
| public class ImplementationSource |
| implements DOMImplementationSource |
| { |
| |
| private static final String DIGITS = "1234567890"; |
| |
| /* |
| * GNU DOM implementations. |
| */ |
| private static final DOMImplementation[] implementations; |
| |
| static |
| { |
| List acc = new ArrayList(); |
| acc.add(new gnu.xml.dom.DomImpl()); |
| try |
| { |
| Class t = Class.forName("gnu.xml.libxmlj.dom.GnomeDocumentBuilder"); |
| acc.add(t.newInstance()); |
| } |
| catch (Exception e) |
| { |
| // libxmlj not available |
| } |
| catch (UnsatisfiedLinkError e) |
| { |
| // libxmlj not available |
| } |
| implementations = new DOMImplementation[acc.size()]; |
| acc.toArray(implementations); |
| } |
| |
| public DOMImplementation getDOMImplementation(String features) |
| { |
| List available = getImplementations(features); |
| if (available.isEmpty()) |
| { |
| return null; |
| } |
| return (DOMImplementation) available.get(0); |
| } |
| |
| public DOMImplementationList getDOMImplementationList(String features) |
| { |
| List available = getImplementations(features); |
| return new ImplementationList(available); |
| } |
| |
| /** |
| * Returns a list of the implementations that support the specified |
| * features. |
| */ |
| private final List getImplementations(String features) |
| { |
| List available = new ArrayList(Arrays.asList(implementations)); |
| for (Iterator i = parseFeatures(features).iterator(); i.hasNext(); ) |
| { |
| String feature = (String) i.next(); |
| String version = null; |
| int si = feature.indexOf(' '); |
| if (si != -1) |
| { |
| version = feature.substring(si + 1); |
| feature = feature.substring(0, si); |
| } |
| for (Iterator j = available.iterator(); j.hasNext(); ) |
| { |
| DOMImplementation impl = (DOMImplementation) j.next(); |
| if (!impl.hasFeature(feature, version)) |
| { |
| j.remove(); |
| } |
| } |
| } |
| return available; |
| } |
| |
| /** |
| * Parses the feature list into feature tokens. |
| */ |
| final List parseFeatures(String features) |
| { |
| List list = new ArrayList(); |
| int pos = 0, start = 0; |
| int len = features.length(); |
| for (; pos < len; pos++) |
| { |
| char c = features.charAt(pos); |
| if (c == ' ') |
| { |
| if (pos + 1 < len && |
| DIGITS.indexOf(features.charAt(pos + 1)) == -1) |
| { |
| list.add(getFeature(features, start, pos)); |
| start = pos + 1; |
| } |
| } |
| } |
| if (pos > start) |
| { |
| list.add(getFeature(features, start, len)); |
| } |
| return list; |
| } |
| |
| final String getFeature(String features, int start, int end) |
| { |
| if (features.length() > 0 && features.charAt(start) == '+') |
| { |
| return features.substring(start + 1, end); |
| } |
| return features.substring(start, end); |
| } |
| |
| } |