001/*
002 * (C) Copyright 2016 Nuxeo SA (http://nuxeo.com/) and others.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *     http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 *
016 * Contributors:
017 *     "Guillaume Renard"
018 */
019
020package org.nuxeo.ecm.platform.usermanager.providers;
021
022import java.util.ArrayList;
023import java.util.Iterator;
024import java.util.List;
025
026import org.apache.commons.lang.StringUtils;
027import org.nuxeo.ecm.core.api.NuxeoGroup;
028import org.nuxeo.ecm.platform.query.api.AbstractPageProvider;
029import org.nuxeo.ecm.platform.query.api.PageProvider;
030import org.nuxeo.ecm.platform.usermanager.UserManager;
031import org.nuxeo.runtime.api.Framework;
032
033/**
034 * @since 8.2
035 */
036public abstract class AbstractGroupMemberPageProvider<T> extends AbstractPageProvider<T>
037    implements PageProvider<T> {
038
039    private static final long serialVersionUID = 1L;
040
041    protected static int safeLongToInt(long l) {
042        if (l < Integer.MIN_VALUE || l > Integer.MAX_VALUE) {
043            throw new IllegalArgumentException(l + " cannot be cast to int without changing its value.");
044        }
045        return (int) l;
046    }
047
048    protected UserManager userManager;
049
050    protected List<T> currentPage;
051
052    @Override
053    public List<T> getCurrentPage() {
054        if (currentPage == null) {
055            currentPage = new ArrayList<T>();
056            NuxeoGroup group = (NuxeoGroup) getParameters()[0];
057            String query = null;
058            if (getParameters().length > 1) {
059                query = (String) getParameters()[1];
060            }
061            List<String> members = getMembers(group);
062
063            // remove entries not starting with our query
064            if (StringUtils.isNotEmpty(query) && !"*".equals(query)) {
065                query = query.toLowerCase();
066                final Iterator<String> it = members.iterator();
067                while (it.hasNext()) {
068                    if (!it.next().toLowerCase().startsWith(query)) {
069                        it.remove();
070                    }
071                }
072            }
073
074            int limit = safeLongToInt(getCurrentPageOffset() + getPageSize());
075            if (limit > members.size()) {
076                limit = members.size();
077            }
078
079            for (String member : members.subList(safeLongToInt(getCurrentPageOffset()), limit)) {
080                currentPage.add(getMember(member));
081            }
082
083            setResultsCount(members.size());
084        }
085        return currentPage;
086    }
087
088    protected abstract List<String> getMembers(NuxeoGroup group);
089
090    protected abstract T getMember(String id);
091
092    @Override
093    public long getPageLimit() {
094        long pageSize = getPageSize();
095        if (pageSize == 0) {
096            return 0;
097        }
098        return ((NuxeoGroup) getParameters()[0]).getMemberGroups().size() / pageSize;
099    }
100
101    @Override
102    public boolean isSortable() {
103        return false;
104    }
105
106    @Override
107    protected void pageChanged() {
108        currentPage = null;
109        super.pageChanged();
110    }
111
112    protected UserManager getUserManager() {
113        if (userManager == null) {
114            userManager = Framework.getService(UserManager.class);
115        }
116        return userManager;
117    }
118}