/*
 * Copyright 2005 the original author or authors.
 *
 * 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.wamblee.usermgt.hibernate;

import org.wamblee.persistence.hibernate.HibernateSupport;

import org.wamblee.usermgt.Group;
import org.wamblee.usermgt.GroupSet;

import java.util.List;
import java.util.Set;
import java.util.TreeSet;


/**
 * Set of groups backed by the database.
 *
 * @author Erik Brakkee
 */
public class HibernateGroupSet extends HibernateSupport implements GroupSet {
    /**
     * DOCUMENT ME!
     */
    private static final String QUERY_FIND_BY_NAME = "findGroupByName";

    /**
     * DOCUMENT ME!
     */
    private static final String PARAM_NAME = "name";

    /**
     * DOCUMENT ME!
     */
    private static final String QUERY_COUNT_GROUPS = "countGroups";

/**
     * Creates a new HibernateGroupSet object.
     */
    public HibernateGroupSet() {
        // Empty
    }

    /* (non-Javadoc)
     * @see org.wamblee.usermgt.GroupSet#groupModified(org.wamblee.usermgt.Group)
     */
    /**
     * DOCUMENT ME!
     *
     * @param aGroup DOCUMENT ME!
     */
    public void groupModified(Group aGroup) {
        assert aGroup.getPrimaryKey() != null;
        super.merge(aGroup);
    }

    /* (non-Javadoc)
     * @see org.wamblee.usermgt.GroupSet#find(java.lang.String)
     */
    /**
     * DOCUMENT ME!
     *
     * @param aName DOCUMENT ME!
     *
     * @return DOCUMENT ME!
     *
     * @throws RuntimeException DOCUMENT ME!
     */
    public Group find(String aName) {
        List list = getHibernateTemplate()
            .findByNamedQueryAndNamedParam(QUERY_FIND_BY_NAME, PARAM_NAME, aName);

        if (list.size() > 1) {
            throw new RuntimeException(
                "More than one group with the same name '" + aName + "'");
        }

        if (list.size() == 0) {
            return null;
        }

        return new Group((Group) list.get(0));
    }

    /* (non-Javadoc)
     * @see org.wamblee.usermgt.GroupSet#contains(org.wamblee.usermgt.Group)
     */
    /**
     * DOCUMENT ME!
     *
     * @param aGroup DOCUMENT ME!
     *
     * @return DOCUMENT ME!
     */
    public boolean contains(Group aGroup) {
        return find(aGroup.getName()) != null;
    }

    /* (non-Javadoc)
     * @see org.wamblee.usermgt.GroupSet#add(org.wamblee.usermgt.Group)
     */
    /**
     * DOCUMENT ME!
     *
     * @param aGroup DOCUMENT ME!
     *
     * @return DOCUMENT ME!
     */
    public boolean add(Group aGroup) {
        assert aGroup.getPrimaryKey() == null;

        if (contains(aGroup)) {
            return false;
        }

        super.merge(aGroup);

        return true;
    }

    /* (non-Javadoc)
     * @see org.wamblee.usermgt.GroupSet#remove(org.wamblee.usermgt.Group)
     */
    /**
     * DOCUMENT ME!
     *
     * @param aGroup DOCUMENT ME!
     *
     * @return DOCUMENT ME!
     */
    public boolean remove(Group aGroup) {
        assert aGroup.getPrimaryKey() != null;

        if (!contains(aGroup)) {
            return false;
        }

        Group group = (Group) getHibernateTemplate().merge(aGroup);
        getHibernateTemplate().delete(group);
        aGroup.setPrimaryKey(null);
        aGroup.setPersistedVersion(-1);

        return true;
    }

    /* (non-Javadoc)
     * @see org.wamblee.usermgt.GroupSet#list()
     */
    /**
     * DOCUMENT ME!
     *
     * @return DOCUMENT ME!
     */
    public Set<Group> list() {
        Set<Group>  groups = new TreeSet<Group>();
        List<Group> list   = getHibernateTemplate().loadAll(Group.class);

        for (Group group : list) {
            groups.add(new Group(group));
        }

        return groups;
    }

    /* (non-Javadoc)
     * @see org.wamblee.usermgt.GroupSet#size()
     */
    /**
     * DOCUMENT ME!
     *
     * @return DOCUMENT ME!
     */
    public int size() {
        Long result = (Long) getHibernateTemplate()
            .findByNamedQuery(QUERY_COUNT_GROUPS).get(0);

        return result.intValue();
    }
}