001/* ***** BEGIN LICENSE BLOCK *****
002 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
003 *
004 * The contents of this file are subject to the Mozilla Public License Version
005 * 1.1 (the "License"); you may not use this file except in compliance with
006 * the License. You may obtain a copy of the License at
007 * http://www.mozilla.org/MPL/
008 *
009 * Software distributed under the License is distributed on an "AS IS" basis,
010 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
011 * for the specific language governing rights and limitations under the
012 * License.
013 *
014 * The Original Code is part of dcm4che, an implementation of DICOM(TM) in
015 * Java(TM), hosted at https://github.com/gunterze/dcm4che.
016 *
017 * The Initial Developer of the Original Code is
018 * Agfa Healthcare.
019 * Portions created by the Initial Developer are Copyright (C) 2011
020 * the Initial Developer. All Rights Reserved.
021 *
022 * Contributor(s):
023 * See @authors listed below
024 *
025 * Alternatively, the contents of this file may be used under the terms of
026 * either the GNU General Public License Version 2 or later (the "GPL"), or
027 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
028 * in which case the provisions of the GPL or the LGPL are applicable instead
029 * of those above. If you wish to allow use of your version of this file only
030 * under the terms of either the GPL or the LGPL, and not to allow others to
031 * use your version of this file under the terms of the MPL, indicate your
032 * decision by deleting the provisions above and replace them with the notice
033 * and other provisions required by the GPL or the LGPL. If you do not delete
034 * the provisions above, a recipient may use your version of this file under
035 * the terms of any one of the MPL, the GPL or the LGPL.
036 *
037 * ***** END LICENSE BLOCK ***** */
038
039package org.dcm4che3.io;
040
041import java.util.HashMap;
042
043import javax.xml.transform.Templates;
044import javax.xml.transform.TransformerConfigurationException;
045import javax.xml.transform.stream.StreamSource;
046
047
048/**
049 * @author Gunter Zeilinger <gunterze@gmail.com>
050 */
051public class TemplatesCache {
052
053    private static TemplatesCache defaultCache;
054
055    private final HashMap<String, Templates> map = new HashMap<String, Templates>();
056
057    public static synchronized TemplatesCache getDefault() {
058        if (defaultCache == null) {
059            defaultCache = new TemplatesCache();
060        }
061        return defaultCache;
062    }
063
064    public static synchronized void setDefault(TemplatesCache cache) {
065        if (cache == null) {
066            throw new NullPointerException();
067        }
068        defaultCache = cache;
069    }
070
071    public void clear() {
072        map.clear();
073    }
074
075    public Templates get(String uri) throws TransformerConfigurationException {
076        Templates tpl = map.get(uri);
077        if (tpl == null)
078            map.put(uri, tpl = SAXTransformer.newTemplates(new StreamSource(uri)));
079        return tpl;
080    }
081}