/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.ambari.server.controller.internal;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Map;
import java.util.Set;
import org.apache.ambari.server.controller.spi.Resource;
import org.apache.ambari.server.controller.spi.Resource.Type;
import org.apache.commons.lang.StringUtils;
/**
* Abstract resource provider implementation that contains helper methods for
* retrieving data from a result set.
*/
public abstract class AbstractJDBCResourceProvider<E extends Enum<E>> extends
AbstractResourceProvider {
private final Map<String,E> dbFields;
/**
* Create a new resource provider.
*
* @param propertyIds
* the property ids
* @param keyPropertyIds
* the key property ids
*/
protected AbstractJDBCResourceProvider(Set<String> propertyIds,
Map<Type,String> keyPropertyIds) {
super(propertyIds, keyPropertyIds);
this.dbFields = getDBFieldMap();
}
/**
* Gets a map from property ids to db fields.
*
* @return the map from property ids to db fields.
*/
protected abstract Map<String,E> getDBFieldMap();
/**
* Retrieves the db field corresponding to a property id from a result set as
* a string and sets the resulting string as a resource property.
*
* @param resource
* resource object to set the property on
* @param propertyId
* the property id to retrieve from the result set
* @param rs
* the result set
* @param requestedIds
* the requested ids
* @throws SQLException
* if property id cannot be retrieved from the result set
*/
protected void setString(Resource resource, String propertyId, ResultSet rs,
Set<String> requestedIds) throws SQLException {
if (requestedIds.contains(propertyId))
setResourceProperty(resource, propertyId,
rs.getString(dbFields.get(propertyId).toString()), requestedIds);
}
/**
* Retrieves the db field corresponding to a property id from a result set as
* an int and sets the resulting int as a resource property.
*
* @param resource
* resource object to set the property on
* @param propertyId
* the property id to retrieve from the result set
* @param rs
* the result set
* @param requestedIds
* the requested ids
* @throws SQLException
* if property id cannot be retrieved from the result set
*/
protected void setInt(Resource resource, String propertyId, ResultSet rs,
Set<String> requestedIds) throws SQLException {
if (requestedIds.contains(propertyId))
setResourceProperty(resource, propertyId,
rs.getInt(dbFields.get(propertyId).toString()), requestedIds);
}
/**
* Retrieves the db field corresponding to a property id from a result set as
* a long and sets the resulting long as a resource property.
*
* @param resource
* resource object to set the property on
* @param propertyId
* the property id to retrieve from the result set
* @param rs
* the result set
* @param requestedIds
* the requested ids
* @throws SQLException
* if property id cannot be retrieved from the result set
*/
protected void setLong(Resource resource, String propertyId, ResultSet rs,
Set<String> requestedIds) throws SQLException {
if (requestedIds.contains(propertyId))
setResourceProperty(resource, propertyId,
rs.getLong(dbFields.get(propertyId).toString()), requestedIds);
}
/**
* Gets a comma-separated list of db fields corresponding to set of requested
* ids.
*
* @param requestedIds
* the requested ids
* @return a comma-separated list of db fields
*/
protected String getDBFieldString(Set<String> requestedIds) {
String[] tmp = new String[requestedIds.size()];
int i = 0;
for (String s : requestedIds)
if (dbFields.containsKey(s))
tmp[i++] = dbFields.get(s).toString();
return StringUtils.join(tmp, ",", 0, i);
}
/**
* Gets a db field corresponding to a property id.
*
* @param propertyId
* the property id
* @return the db field enum value
*/
protected E getDBField(String propertyId) {
return dbFields.get(propertyId);
}
}