/*
* 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.cassandra;
import com.facebook.presto.cassandra.util.CassandraCqlUtils;
import com.facebook.presto.spi.ConnectorColumnHandle;
import com.facebook.presto.spi.ColumnMetadata;
import com.facebook.presto.spi.ConnectorSession;
import com.facebook.presto.spi.ConnectorTableHandle;
import com.facebook.presto.spi.ConnectorTableMetadata;
import com.facebook.presto.spi.NotFoundException;
import com.facebook.presto.spi.ReadOnlyConnectorMetadata;
import com.facebook.presto.spi.SchemaNotFoundException;
import com.facebook.presto.spi.SchemaTableName;
import com.facebook.presto.spi.SchemaTablePrefix;
import com.google.common.base.Objects;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.inject.Inject;
import java.util.List;
import java.util.Map;
import static com.facebook.presto.cassandra.CassandraColumnHandle.columnMetadataGetter;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.collect.Iterables.transform;
public class CassandraMetadata
extends ReadOnlyConnectorMetadata
{
private final String connectorId;
private final CachingCassandraSchemaProvider schemaProvider;
@Inject
public CassandraMetadata(CassandraConnectorId connectorId, CachingCassandraSchemaProvider schemaProvider)
{
this.connectorId = checkNotNull(connectorId, "connectorId is null").toString();
this.schemaProvider = checkNotNull(schemaProvider, "schemaProvider is null");
}
@Override
public List<String> listSchemaNames(ConnectorSession session)
{
return schemaProvider.getAllSchemas();
}
@Override
public CassandraTableHandle getTableHandle(ConnectorSession session, SchemaTableName tableName)
{
checkNotNull(tableName, "tableName is null");
try {
CassandraTableHandle tableHandle = schemaProvider.getTableHandle(tableName);
schemaProvider.getTable(tableHandle);
return tableHandle;
}
catch (NotFoundException e) {
// table was not found
return null;
}
}
private static SchemaTableName getTableName(ConnectorTableHandle tableHandle)
{
checkArgument(tableHandle instanceof CassandraTableHandle, "tableHandle is not an instance of CassandraTableHandle");
return ((CassandraTableHandle) tableHandle).getSchemaTableName();
}
@Override
public ConnectorTableMetadata getTableMetadata(ConnectorTableHandle tableHandle)
{
checkNotNull(tableHandle, "tableHandle is null");
SchemaTableName tableName = getTableName(tableHandle);
return getTableMetadata(tableName);
}
private ConnectorTableMetadata getTableMetadata(SchemaTableName tableName)
{
CassandraTableHandle tableHandle = schemaProvider.getTableHandle(tableName);
CassandraTable table = schemaProvider.getTable(tableHandle);
List<ColumnMetadata> columns = ImmutableList.copyOf(transform(table.getColumns(), columnMetadataGetter()));
return new ConnectorTableMetadata(tableName, columns);
}
@Override
public List<SchemaTableName> listTables(ConnectorSession session, String schemaNameOrNull)
{
ImmutableList.Builder<SchemaTableName> tableNames = ImmutableList.builder();
for (String schemaName : listSchemas(session, schemaNameOrNull)) {
try {
for (String tableName : schemaProvider.getAllTables(schemaName)) {
tableNames.add(new SchemaTableName(schemaName, tableName.toLowerCase()));
}
}
catch (SchemaNotFoundException e) {
// schema disappeared during listing operation
}
}
return tableNames.build();
}
private List<String> listSchemas(ConnectorSession session, String schemaNameOrNull)
{
if (schemaNameOrNull == null) {
return listSchemaNames(session);
}
return ImmutableList.of(schemaNameOrNull);
}
@Override
public ConnectorColumnHandle getColumnHandle(ConnectorTableHandle tableHandle, String columnName)
{
checkNotNull(tableHandle, "tableHandle is null");
checkNotNull(columnName, "columnName is null");
return getColumnHandles(tableHandle).get(columnName);
}
@Override
public ConnectorColumnHandle getSampleWeightColumnHandle(ConnectorTableHandle tableHandle)
{
return null;
}
@Override
public Map<String, ConnectorColumnHandle> getColumnHandles(ConnectorTableHandle tableHandle)
{
CassandraTable table = schemaProvider.getTable((CassandraTableHandle) tableHandle);
ImmutableMap.Builder<String, ConnectorColumnHandle> columnHandles = ImmutableMap.builder();
for (CassandraColumnHandle columnHandle : table.getColumns()) {
columnHandles.put(CassandraCqlUtils.cqlNameToSqlName(columnHandle.getName()).toLowerCase(), columnHandle);
}
return columnHandles.build();
}
@Override
public Map<SchemaTableName, List<ColumnMetadata>> listTableColumns(ConnectorSession session, SchemaTablePrefix prefix)
{
checkNotNull(prefix, "prefix is null");
ImmutableMap.Builder<SchemaTableName, List<ColumnMetadata>> columns = ImmutableMap.builder();
for (SchemaTableName tableName : listTables(session, prefix)) {
try {
columns.put(tableName, getTableMetadata(tableName).getColumns());
}
catch (NotFoundException e) {
// table disappeared during listing operation
}
}
return columns.build();
}
private List<SchemaTableName> listTables(ConnectorSession session, SchemaTablePrefix prefix)
{
if (prefix.getSchemaName() == null) {
return listTables(session, prefix.getSchemaName());
}
return ImmutableList.of(new SchemaTableName(prefix.getSchemaName(), prefix.getTableName()));
}
@Override
public ColumnMetadata getColumnMetadata(ConnectorTableHandle tableHandle, ConnectorColumnHandle columnHandle)
{
checkNotNull(tableHandle, "tableHandle is null");
checkNotNull(columnHandle, "columnHandle is null");
checkArgument(tableHandle instanceof CassandraTableHandle, "tableHandle is not an instance of CassandraTableHandle");
checkArgument(columnHandle instanceof CassandraColumnHandle, "columnHandle is not an instance of CassandraColumnHandle");
return ((CassandraColumnHandle) columnHandle).getColumnMetadata();
}
@Override
public String toString()
{
return Objects.toStringHelper(this)
.add("connectorId", connectorId)
.toString();
}
}