/*
* 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.metadata;
import com.facebook.presto.spi.ColumnHandle;
import com.facebook.presto.spi.ColumnMetadata;
import com.facebook.presto.spi.ConnectorMetadata;
import com.facebook.presto.spi.SchemaTableName;
import com.facebook.presto.spi.SchemaTablePrefix;
import com.facebook.presto.spi.TableHandle;
import com.facebook.presto.spi.TableMetadata;
import com.facebook.presto.tpch.TpchColumnHandle;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;
public class InMemoryMetadata
implements ConnectorMetadata
{
private final ConcurrentMap<SchemaTableName, TableMetadata> tables = new ConcurrentHashMap<>();
@Override
public boolean canHandle(TableHandle tableHandle)
{
return tableHandle instanceof InMemoryTableHandle;
}
@Override
public List<String> listSchemaNames()
{
Set<String> schemaNames = new HashSet<>();
for (SchemaTableName schemaTableName : tables.keySet()) {
schemaNames.add(schemaTableName.getSchemaName());
}
return ImmutableList.copyOf(schemaNames);
}
@Override
public TableHandle getTableHandle(SchemaTableName tableName)
{
checkNotNull(tableName, "tableName is null");
if (!tables.containsKey(tableName)) {
return null;
}
return new InMemoryTableHandle(tableName);
}
@Override
public TableMetadata getTableMetadata(TableHandle tableHandle)
{
checkNotNull(tableHandle, "tableHandle is null");
SchemaTableName tableName = getTableName(tableHandle);
TableMetadata tableMetadata = tables.get(tableName);
checkArgument(tableMetadata != null, "Table %s does not exist", tableName);
return tableMetadata;
}
@Override
public Map<String, ColumnHandle> getColumnHandles(TableHandle tableHandle)
{
ImmutableMap.Builder<String, ColumnHandle> builder = ImmutableMap.builder();
for (ColumnMetadata columnMetadata : getTableMetadata(tableHandle).getColumns()) {
builder.put(columnMetadata.getName(), new TpchColumnHandle(columnMetadata.getName(), columnMetadata.getOrdinalPosition(), columnMetadata.getType()));
}
return builder.build();
}
@Override
public ColumnHandle getColumnHandle(TableHandle tableHandle, String columnName)
{
for (ColumnMetadata columnMetadata : getTableMetadata(tableHandle).getColumns()) {
if (columnMetadata.getName().equals(columnName)) {
return new TpchColumnHandle(columnMetadata.getName(), columnMetadata.getOrdinalPosition(), columnMetadata.getType());
}
}
return null;
}
@Override
public Map<SchemaTableName, List<ColumnMetadata>> listTableColumns(SchemaTablePrefix prefix)
{
checkNotNull(prefix, "prefix is null");
ImmutableMap.Builder<SchemaTableName, List<ColumnMetadata>> tableColumns = ImmutableMap.builder();
for (SchemaTableName tableName : listTables(prefix.getSchemaName())) {
int position = 1;
ImmutableList.Builder<ColumnMetadata> columns = ImmutableList.builder();
for (ColumnMetadata column : tables.get(tableName).getColumns()) {
columns.add(new ColumnMetadata(column.getName(), column.getType(), position, false));
position++;
}
tableColumns.put(tableName, columns.build());
}
return tableColumns.build();
}
@Override
public ColumnMetadata getColumnMetadata(TableHandle tableHandle, ColumnHandle columnHandle)
{
SchemaTableName tableName = getTableName(tableHandle);
checkArgument(columnHandle instanceof TpchColumnHandle, "columnHandle is not an instance of TpchColumnHandle");
TpchColumnHandle tpchColumnHandle = (TpchColumnHandle) columnHandle;
int columnIndex = tpchColumnHandle.getFieldIndex();
return tables.get(tableName).getColumns().get(columnIndex);
}
@Override
public List<SchemaTableName> listTables(String schemaNameOrNull)
{
ImmutableList.Builder<SchemaTableName> builder = ImmutableList.builder();
for (SchemaTableName tableName : tables.keySet()) {
if (schemaNameOrNull == null || schemaNameOrNull.equals(tableName.getSchemaName())) {
builder.add(tableName);
}
}
return builder.build();
}
@Override
public TableHandle createTable(TableMetadata tableMetadata)
{
TableMetadata existingTable = tables.putIfAbsent(tableMetadata.getTable(), tableMetadata);
checkArgument(existingTable == null, "Table %s already exists", tableMetadata.getTable());
return new InMemoryTableHandle(tableMetadata.getTable());
}
@Override
public void dropTable(TableHandle tableHandle)
{
tables.remove(getTableName(tableHandle));
}
private SchemaTableName getTableName(TableHandle tableHandle)
{
checkNotNull(tableHandle, "tableHandle is null");
checkArgument(tableHandle instanceof InMemoryTableHandle, "tableHandle is not an instance of InMemoryTableHandle");
InMemoryTableHandle inMemoryTableHandle = (InMemoryTableHandle) tableHandle;
return inMemoryTableHandle.getTableName();
}
public static class InMemoryTableHandle
implements TableHandle
{
private final SchemaTableName tableName;
public InMemoryTableHandle(SchemaTableName schemaTableName)
{
this.tableName = schemaTableName;
}
public SchemaTableName getTableName()
{
return tableName;
}
}
}