/*
 * 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 com.addthis.hydra.job.alias;

import java.util.List;
import java.util.Map;

import com.addthis.hydra.job.store.SpawnDataStore;
import com.addthis.hydra.query.spawndatastore.AliasBiMap;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class AliasManagerImpl implements AliasManager {

    private static final Logger log = LoggerFactory.getLogger(AliasManagerImpl.class);

    private AliasBiMap aliasBiMap;

    public AliasManagerImpl(SpawnDataStore spawnDataStore) {
        this.aliasBiMap = new AliasBiMap(spawnDataStore);
        aliasBiMap.loadCurrentValues();
    }

    /**
     * Returns a map describing alias name => jobIds
     */
    public Map<String, List<String>> getAliases() {
        return aliasBiMap.viewAliasMap();
    }

    public List<String> aliasToJobs(String alias) {
        return aliasBiMap.getJobs(alias);
    }

    /**
     * Updates the full job id list of an alias.
     * 
     * This method does nothing if the give job id list is empty.
     */
    public void addAlias(String alias, List<String> jobs) {
        if (jobs.size() > 0) {
            aliasBiMap.putAlias(alias, jobs);
        } else {
            log.warn("Ignoring empty jobs addition for alias: {}", alias);
        }
    }

    public void deleteAlias(String alias) {
        aliasBiMap.deleteAlias(alias);
    }

}