/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.cassandra.cql3;
import java.util.Locale;
import java.nio.ByteBuffer;
import org.apache.cassandra.config.CFMetaData;
import org.apache.cassandra.config.ColumnDefinition;
import org.apache.cassandra.cql3.statements.Selectable;
import org.apache.cassandra.db.marshal.AbstractType;
import org.apache.cassandra.db.marshal.CompositeType;
import org.apache.cassandra.db.marshal.UTF8Type;
import org.apache.cassandra.utils.ByteBufferUtil;
/**
* Represents an identifer for a CQL column definition.
*/
public class ColumnIdentifier implements Selectable
{
public final ByteBuffer key;
private final String text;
public ColumnIdentifier(String rawText, boolean keepCase)
{
this.text = keepCase ? rawText : rawText.toLowerCase(Locale.US);
this.key = ByteBufferUtil.bytes(this.text);
}
public ColumnIdentifier(ByteBuffer key, AbstractType<?> type)
{
this.key = key;
this.text = type.getString(key);
}
private ColumnIdentifier(ByteBuffer key, String text)
{
this.key = key;
this.text = text;
}
@Override
public final int hashCode()
{
return key.hashCode();
}
@Override
public final boolean equals(Object o)
{
if(!(o instanceof ColumnIdentifier))
return false;
ColumnIdentifier that = (ColumnIdentifier)o;
return key.equals(that.key);
}
@Override
public String toString()
{
return text;
}
/**
* Because Thrift-created tables may have a non-text comparator, we cannot determine the proper 'key' until
* we know the comparator. ColumnIdentifier.Raw is a placeholder that can be converted to a real ColumnIdentifier
* once the comparator is known with prepare(). This should only be used with identifiers that are actual
* column names. See CASSANDRA-8178 for more background.
*/
public static class Raw implements Selectable.Raw
{
private final String rawText;
private final String text;
public Raw(String rawText, boolean keepCase)
{
this.rawText = rawText;
this.text = keepCase ? rawText : rawText.toLowerCase();
}
public ColumnIdentifier prepare(CFMetaData cfm)
{
if (cfm.getIsDense() || cfm.comparator instanceof CompositeType || cfm.comparator instanceof UTF8Type)
return new ColumnIdentifier(text, true);
// We have a Thrift-created table with a non-text comparator. We need to parse column names with the comparator
// to get the correct ByteBuffer representation. However, this doesn't apply to key aliases, so we need to
// make a special check for those and treat them normally. See CASSANDRA-8178.
ByteBuffer bufferName = ByteBufferUtil.bytes(text);
for (ColumnDefinition def : cfm.partitionKeyColumns())
{
if (def.name.equals(bufferName))
return new ColumnIdentifier(text, true);
}
return new ColumnIdentifier(cfm.comparator.fromString(rawText), text);
}
public boolean processesSelection()
{
return false;
}
@Override
public final int hashCode()
{
return text.hashCode();
}
@Override
public final boolean equals(Object o)
{
if(!(o instanceof ColumnIdentifier.Raw))
return false;
ColumnIdentifier.Raw that = (ColumnIdentifier.Raw)o;
return text.equals(that.text);
}
@Override
public String toString()
{
return text;
}
}
}