/*
 *
 * Copyright (c) 2013 - 2017 Lijun Liao
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License version 3
 * as published by the Free Software Foundation with the addition of the
 * following permission added to Section 15 as permitted in Section 7(a):
 *
 * FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY
 * THE AUTHOR LIJUN LIAO. LIJUN LIAO DISCLAIMS THE WARRANTY OF NON INFRINGEMENT
 * OF THIRD PARTY RIGHTS.
 *
 * This program 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 *
 * The interactive user interfaces in modified source and object code versions
 * of this program must display Appropriate Legal Notices, as required under
 * Section 5 of the GNU Affero General Public License.
 *
 * You can be released from the requirements of the license by purchasing
 * a commercial license. Buying such a license is mandatory as soon as you
 * develop commercial activities involving the XiPKI software without
 * disclosing the source code of your own applications.
 *
 * For more information, please contact Lijun Liao at this
 * address: lijun.liao@gmail.com
 */

package org.xipki.pki.ca.server.impl.store;

import java.util.HashMap;
import java.util.Map;

import org.xipki.commons.common.util.CollectionUtil;
import org.xipki.commons.common.util.CompareUtil;
import org.xipki.commons.common.util.ParamUtil;

/**
 * @author Lijun Liao
 * @since 2.0.0
 */

class NameIdStore {

    private final String table;

    private final Map<String, Integer> entries;

    NameIdStore(final String table, final Map<String, Integer> entries) {
        this.table = ParamUtil.requireNonNull("table", table);
        this.entries = new HashMap<>();

        if (CollectionUtil.isNonEmpty(entries)) {
            for (String name : entries.keySet()) {
                addEntry(name, entries.get(name));
            }
        }
    }

    void addEntry(final String name, final Integer id) {
        ParamUtil.requireNonBlank("name", name);
        ParamUtil.requireNonNull("id", id);

        if (entries.containsKey(name)) {
            throw new IllegalArgumentException(
                    "entry with the same name " + name + " already available");
        }

        if (entries.containsValue(id)) {
            throw new IllegalArgumentException(
                    "entry with the same id " + id + " already available");
        }

        entries.put(name, id);
    }

    String getName(final Integer id) {
        for (String name : entries.keySet()) {
            if (CompareUtil.equalsObject(id, entries.get(name))) {
                return name;
            }
        }

        return null;
    }

    Integer getId(final String name) {
        return entries.get(name);
    }

    public String getTable() {
        return table;
    }

}