001/*
002 * (C) Copyright 2016-2018 Nuxeo (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.lang3.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> implements PageProvider<T> {
037
038    private static final long serialVersionUID = 1L;
039
040    protected static int safeLongToInt(long l) {
041        if (l < Integer.MIN_VALUE || l > Integer.MAX_VALUE) {
042            throw new IllegalArgumentException(l + " cannot be cast to int without changing its value.");
043        }
044        return (int) l;
045    }
046
047    protected UserManager userManager;
048
049    protected List<T> currentPage;
050
051    @Override
052    public List<T> getCurrentPage() {
053        if (currentPage == null) {
054            currentPage = new ArrayList<>();
055            NuxeoGroup group = (NuxeoGroup) getParameters()[0];
056            String query = null;
057            if (getParameters().length > 1) {
058                query = (String) getParameters()[1];
059            }
060            List<String> members = getMembers(group);
061
062            // remove entries not starting with our query
063            if (StringUtils.isNotEmpty(query) && !"*".equals(query)) {
064                query = query.toLowerCase();
065                final Iterator<String> it = members.iterator();
066                while (it.hasNext()) {
067                    if (!it.next().toLowerCase().startsWith(query)) {
068                        it.remove();
069                    }
070                }
071            }
072
073            int limit = safeLongToInt(getCurrentPageOffset() + getPageSize());
074            if (limit > members.size()) {
075                limit = members.size();
076            }
077
078            for (String member : members.subList(safeLongToInt(getCurrentPageOffset()), limit)) {
079                T object = getMember(member);
080                if (object != null) {
081                    currentPage.add(object);
082                }
083            }
084
085            setResultsCount(members.size());
086        }
087        return currentPage;
088    }
089
090    protected abstract List<String> getMembers(NuxeoGroup group);
091
092    protected abstract T getMember(String id);
093
094    @Override
095    public long getPageLimit() {
096        long pageSize = getPageSize();
097        if (pageSize == 0) {
098            return 0;
099        }
100        return ((NuxeoGroup) getParameters()[0]).getMemberGroups().size() / pageSize;
101    }
102
103    @Override
104    public boolean isSortable() {
105        return false;
106    }
107
108    @Override
109    protected void pageChanged() {
110        currentPage = null;
111        super.pageChanged();
112    }
113
114    protected UserManager getUserManager() {
115        if (userManager == null) {
116            userManager = Framework.getService(UserManager.class);
117        }
118        return userManager;
119    }
120}