/*
* 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.facebook.presto.execution;
import com.facebook.presto.metadata.Metadata;
import com.facebook.presto.metadata.QualifiedTableName;
import com.facebook.presto.metadata.ViewDefinition;
import com.facebook.presto.spi.ConnectorSession;
import com.facebook.presto.sql.analyzer.SemanticException;
import com.facebook.presto.sql.tree.DropView;
import com.google.common.base.Optional;
import static com.facebook.presto.metadata.MetadataUtil.createQualifiedTableName;
import static com.facebook.presto.sql.analyzer.SemanticErrorCode.MISSING_TABLE;
public class DropViewTask
implements DataDefinitionTask<DropView>
{
@Override
public void execute(DropView statement, ConnectorSession session, Metadata metadata)
{
QualifiedTableName name = createQualifiedTableName(session, statement.getName());
Optional<ViewDefinition> view = metadata.getView(session, name);
if (!view.isPresent()) {
throw new SemanticException(MISSING_TABLE, statement, "View '%s' does not exist", name);
}
metadata.dropView(session, name);
}
}