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/*
 * Copyright 2016 Red Hat, Inc. and/or its affiliates
 * and other contributors as indicated by the @author tags.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.keycloak.models;

import org.keycloak.provider.ProviderEvent;

import java.util.Comparator;
import java.util.List;
import java.util.Map;
import java.util.stream.Stream;

/**
 * @author Bill Burke
 * @version $Revision: 1 $
 */
public interface GroupModel extends RoleMapperModel {

    interface GroupRemovedEvent extends ProviderEvent {
        RealmModel getRealm();
        GroupModel getGroup();
        KeycloakSession getKeycloakSession();
    }

    interface GroupPathChangeEvent extends ProviderEvent {
        RealmModel getRealm();
        String getNewPath();
        String getPreviousPath();
        KeycloakSession getKeycloakSession();
    }

    Comparator COMPARE_BY_NAME = Comparator.comparing(GroupModel::getName);

    String getId();

    String getName();

    void setName(String name);

    /**
     * Set single value of specified attribute. Remove all other existing values
     *
     * @param name
     * @param value
     */
    void setSingleAttribute(String name, String value);

    void setAttribute(String name, List values);

    void removeAttribute(String name);

    /**
     * @param name
     * @return null if there is not any value of specified attribute or first value otherwise. Don't throw exception if there are more values of the attribute
     */
    String getFirstAttribute(String name);


    /**
     * Returns group attributes that match the given name as a stream.
     * @param name {@code String} Name of the attribute to be used as a filter.
     * @return Stream of all attribute values or empty stream if there are not any values. Never return {@code null}.
     */
    Stream getAttributeStream(String name);

    Map> getAttributes();

    GroupModel getParent();
    String getParentId();

    /**
     * Returns all sub groups for the parent group as a stream.
     * The stream is sorted by the group name.
     *
     * @return Stream of {@link GroupModel}. Never returns {@code null}.
     */
    Stream getSubGroupsStream();

    /**
     * Returns all sub groups for the parent group matching the fuzzy search as a stream, paginated.
     * Stream is sorted by the group name.
     *
     * @param search searched string. If empty or {@code null} all subgroups are returned.
     * @return Stream of {@link GroupModel}. Never returns {@code null}.
     */
    default Stream getSubGroupsStream(String search, Integer firstResult, Integer maxResults) {
       return getSubGroupsStream(search, false, firstResult, maxResults);
    }

    /**
     * Returns all sub groups for the parent group as a stream, paginated.
     *
     * @param firstResult First result to return. Ignored if negative or {@code null}.
     * @param maxResults Maximum number of results to return. Ignored if negative or {@code null}.
     * @return
     */
    default Stream getSubGroupsStream(Integer firstResult, Integer maxResults) {
        return getSubGroupsStream(null, firstResult, maxResults);
    }

    /**
     * Returns all subgroups for the parent group matching the search as a stream, paginated.
     * Stream is sorted by the group name.
     *
     * @param search search string. If empty or {@code null} all subgroups are returned.
     * @param exact toggles fuzzy searching
     * @param firstResult First result to return. Ignored if negative or {@code null}.
     * @param maxResults Maximum number of results to return. Ignored if negative or {@code null}.
     * @return Stream of {@link GroupModel}. Never returns {@code null}.
     */
    default Stream getSubGroupsStream(String search, Boolean exact, Integer firstResult, Integer maxResults) {
        Stream allSubgorupsGroups = getSubGroupsStream().filter(group -> {
            if (search == null || search.isEmpty()) return true;
            if (Boolean.TRUE.equals(exact)) {
                return group.getName().equals(search);
            } else {
                return group.getName().toLowerCase().contains(search.toLowerCase());
            }
        });

        // Copied over from StreamsUtil from server-spi-private which is not available here
        if (firstResult != null && firstResult > 0) {
            allSubgorupsGroups = allSubgorupsGroups.skip(firstResult);
        }

        if (maxResults != null && maxResults >= 0) {
            allSubgorupsGroups = allSubgorupsGroups.limit(maxResults);
        }

        return allSubgorupsGroups;
    }

    /**
     * Returns the number of groups contained beneath this group.
     *
     * @return The number of groups beneath this group. Never returns {@code null}.
     */
    default Long getSubGroupsCount() {
        return getSubGroupsStream().count();
    }

    /**
     * You must also call addChild on the parent group, addChild on RealmModel if there is no parent group
     *
     * @param group
     */
    void setParent(GroupModel group);

    /**
     * Automatically calls setParent() on the subGroup
     *
     * @param subGroup
     */
    void addChild(GroupModel subGroup);

    /**
     * Automatically calls setParent() on the subGroup
     *
     * @param subGroup
     */
    void removeChild(GroupModel subGroup);
}




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