001/*
002 * This library is part of OpenCms -
003 * the Open Source Content Management System
004 *
005 * Copyright (C) Alkacon Software (http://www.alkacon.com)
006 *
007 * This library is free software; you can redistribute it and/or
008 * modify it under the terms of the GNU Lesser General Public
009 * License as published by the Free Software Foundation; either
010 * version 2.1 of the License, or (at your option) any later version.
011 *
012 * This library is distributed in the hope that it will be useful,
013 * but WITHOUT ANY WARRANTY; without even the implied warranty of
014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
015 * Lesser General Public License for more details.
016 *
017 * For further information about Alkacon Software, please see the
018 * company website: http://www.alkacon.com
019 *
020 * For further information about OpenCms, please see the
021 * project website: http://www.opencms.org
022 *
023 * You should have received a copy of the GNU Lesser General Public
024 * License along with this library; if not, write to the Free Software
025 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
026 */
027
028package org.opencms.cmis;
029
030import java.util.HashSet;
031import java.util.Set;
032
033/**
034 * This class encapsulates the filter logic for CMIS rendition filters.<p>
035 */
036public class CmsCmisRenditionFilter {
037
038    /** Flag which indicates that all renditions should be returned. */
039    private boolean m_includeAll;
040
041    /** The kinds which will be accepted. */
042    private Set<String> m_kinds = new HashSet<String>();
043
044    /** The MIME supertypes which will be accepted. */
045    private Set<String> m_supertypes = new HashSet<String>();
046
047    /** The MIME types which will be accepted. */
048    private Set<String> m_types = new HashSet<String>();
049
050    /**
051     * Creates a new filter from the given filter string.<p>
052     *
053     * @param filterStr the CMIS rendition filter string
054     */
055    public CmsCmisRenditionFilter(String filterStr) {
056
057        if ((filterStr == null) || filterStr.equals("cmis:none")) {
058            return;
059        } else if ("*".equals(filterStr)) {
060            m_includeAll = true;
061        } else {
062            String[] tokens = filterStr.split(",");
063            for (String token : tokens) {
064                int slashPos = token.indexOf("/");
065                if (slashPos > -1) {
066                    String supertype = token.substring(0, slashPos);
067                    String subtype = token.substring(slashPos + 1);
068                    if ("*".equals(subtype)) {
069                        m_supertypes.add(supertype);
070                    } else {
071                        m_types.add(token);
072                    }
073                } else {
074                    m_kinds.add(token);
075                }
076            }
077        }
078    }
079
080    /**
081     * Checks whether this filter accepts a given kind/mimetype combination.<p>
082     *
083     * @param kind the kind
084     * @param mimetype the mime type
085     *
086     * @return true if the filter accepts the combination
087     */
088    public boolean accept(String kind, String mimetype) {
089
090        if (m_includeAll) {
091            return true;
092        }
093        int slashpos = mimetype.indexOf("/");
094        String supertype = mimetype.substring(0, slashpos);
095        return m_kinds.contains(kind) || m_types.contains(mimetype) || m_supertypes.contains(supertype);
096    }
097
098}