/**
* Copyright 2013-2014 Recruit Technologies Co., Ltd. and contributors
* (see CONTRIBUTORS.md)
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License. A copy of the
* License is distributed with this work in the LICENSE.md file. You may
* also obtain a copy of the License from
*
* 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.gennai.gungnir.ql.task;
import org.gennai.gungnir.GungnirManager;
import org.gennai.gungnir.UserEntity;
import org.gennai.gungnir.metastore.MetaStore;
import org.gennai.gungnir.metastore.MetaStoreException;
import org.gennai.gungnir.metastore.NotStoredException;
import org.gennai.gungnir.tuple.schema.Schema;
public class DropSchemaTask implements Task {
private String schemaName;
private UserEntity owner;
public DropSchemaTask(String schemaName, UserEntity owner) {
this.schemaName = schemaName;
this.owner = owner;
}
@Override
public String execute() throws TaskExecuteException {
try {
MetaStore metaStore = GungnirManager.getManager().getMetaStore();
Schema schema = metaStore.findSchema(schemaName, owner);
if (!schema.getTopologies().isEmpty()) {
throw new TaskExecuteException(schemaName + " has been used");
}
if (!metaStore.deleteSchema(schema)) {
throw new TaskExecuteException(schemaName + " has been used");
}
} catch (MetaStoreException e) {
throw new TaskExecuteException(e);
} catch (NotStoredException e) {
throw new TaskExecuteException(e);
}
return "OK";
}
}