IndexDao.java

/*******************************************************************************
 * This file is part of OpenNMS(R).
 *
 * Copyright (C) 2006-2011 The OpenNMS Group, Inc.
 * OpenNMS(R) is Copyright (C) 1999-2011 The OpenNMS Group, Inc.
 *
 * OpenNMS(R) is a registered trademark of The OpenNMS Group, Inc.
 *
 * OpenNMS(R) is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published
 * by the Free Software Foundation, either version 3 of the License,
 * or (at your option) any later version.
 *
 * OpenNMS(R) is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with OpenNMS(R).  If not, see:
 *      http://www.gnu.org/licenses/
 *
 * For more information contact:
 *     OpenNMS(R) Licensing <license@opennms.org>
 *     http://www.opennms.org/
 *     http://www.opennms.com/
 *******************************************************************************/

package org.opennms.netmgt.dao.db;

import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;

public class IndexDao {
    private Map<String, Index> m_nameMap;
    private Map<String, List<Index>> m_tableMap;

    /**
     * <p>Constructor for IndexDao.</p>
     */
    public IndexDao() {
        reset();
    }
    
    /**
     * <p>reset</p>
     */
    public void reset() {
        m_nameMap = new LinkedHashMap<String, Index>();
        m_tableMap = new HashMap<String, List<Index>>();
    }
    
    /**
     * <p>add</p>
     *
     * @param i a {@link org.opennms.netmgt.dao.db.Index} object.
     */
    public void add(Index i) {
        String lowerName = i.getName().toLowerCase();
        if (m_nameMap.containsKey(lowerName)) {
            throw new IllegalArgumentException("Index with name of '"
                                               + lowerName
                                               + "' already exists.");
        }
        
        m_nameMap.put(lowerName, i);
        
        getIndexesForTableCreateIfEmpty(i.getTable().toLowerCase()).add(i);
    }
    
    private List<Index> getIndexesForTableCreateIfEmpty(String table) {
        if (!m_tableMap.containsKey(table)) {
            m_tableMap.put(table, new LinkedList<Index>());
        }
        return m_tableMap.get(table);
    }
    
    /**
     * <p>getIndexesForTable</p>
     *
     * @param table a {@link java.lang.String} object.
     * @return a {@link java.util.List} object.
     */
    public List<Index> getIndexesForTable(String table) {
        String lowerName = table.toLowerCase();
        if (!m_tableMap.containsKey(lowerName)) {
            return new LinkedList<Index>();
        }
        return m_tableMap.get(lowerName);
    }
    
    /**
     * <p>getAllIndexes</p>
     *
     * @return a {@link java.util.Collection} object.
     */
    public Collection<Index> getAllIndexes() {
        return Collections.unmodifiableCollection(m_nameMap.values());
    }
    
    /**
     * <p>remove</p>
     *
     * @param indexName a {@link java.lang.String} object.
     */
    public void remove(String indexName) {
        String lowerName = indexName.toLowerCase();
        
        Index index = m_nameMap.remove(lowerName);
        if (index == null) {
            throw new IllegalArgumentException("Index with name of '"
                                               + lowerName
                                               + "' does not exist.");
        }
        
        for (List<Index> indexes : m_tableMap.values()) {
            for (Index i : indexes) {
                if (index.equals(i)) {
                    indexes.remove(i);
                    return;
                }
            }
        }
    }
}