/*
* 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.connector.system;
import com.facebook.presto.connector.ConnectorId;
import com.facebook.presto.spi.ColumnHandle;
import com.facebook.presto.spi.ColumnMetadata;
import com.facebook.presto.spi.ConnectorTableMetadata;
import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.google.common.collect.ImmutableMap;
import java.util.Map;
import java.util.Objects;
import static java.util.Objects.requireNonNull;
public class SystemColumnHandle
implements ColumnHandle
{
private final ConnectorId connectorId;
private final String columnName;
@JsonCreator
public SystemColumnHandle(
@JsonProperty("connectorId") ConnectorId connectorId,
@JsonProperty("columnName") String columnName)
{
this.connectorId = requireNonNull(connectorId, "connectorId is null");
this.columnName = requireNonNull(columnName, "columnName is null");
}
@JsonProperty
public ConnectorId getConnectorId()
{
return connectorId;
}
@JsonProperty
public String getColumnName()
{
return columnName;
}
@Override
public int hashCode()
{
return Objects.hash(connectorId, columnName);
}
@Override
public boolean equals(Object obj)
{
if (this == obj) {
return true;
}
if (obj == null || getClass() != obj.getClass()) {
return false;
}
final SystemColumnHandle other = (SystemColumnHandle) obj;
return Objects.equals(this.connectorId, other.connectorId) &&
Objects.equals(this.columnName, other.columnName);
}
@Override
public String toString()
{
return connectorId + ":" + columnName;
}
public static Map<String, ColumnHandle> toSystemColumnHandles(ConnectorId connectorId, ConnectorTableMetadata tableMetadata)
{
ImmutableMap.Builder<String, ColumnHandle> columnHandles = ImmutableMap.builder();
for (ColumnMetadata columnMetadata : tableMetadata.getColumns()) {
columnHandles.put(columnMetadata.getName(), new SystemColumnHandle(connectorId, columnMetadata.getName()));
}
return columnHandles.build();
}
}