/
ColumnDecoder.java
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/
ColumnDecoder.java
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package org.apache.cassandra.cql.jdbc;
/*
*
* 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.
*
*/
import org.apache.cassandra.config.CFMetaData;
import org.apache.cassandra.config.ColumnDefinition;
import org.apache.cassandra.config.ConfigurationException;
import org.apache.cassandra.db.marshal.AbstractType;
import org.apache.cassandra.db.marshal.AsciiType;
import org.apache.cassandra.thrift.*;
import org.apache.cassandra.utils.ByteBufferUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.nio.ByteBuffer;
import java.nio.charset.CharacterCodingException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* Decodes columns from bytes into instances of their respective expected types.
*/
class ColumnDecoder
{
private static final Logger logger = LoggerFactory.getLogger(ColumnDecoder.class);
private final Map<String, CFMetaData> metadata = new HashMap<String, CFMetaData>();
/**
* is specific per set of keyspace definitions.
*/
public ColumnDecoder(List<KsDef> defs)
{
for (KsDef ks : defs)
{
for (CfDef cf : ks.getCf_defs())
{
try
{
metadata.put(String.format("%s.%s", ks.getName(), cf.getName()), CFMetaData.fromThrift(cf));
}
catch (InvalidRequestException e)
{
throw new RuntimeException(e);
}
catch (ConfigurationException e)
{
throw new RuntimeException(e);
}
}
}
}
AbstractType getComparator(String keyspace, String columnFamily)
{
return metadata.get(String.format("%s.%s", keyspace, columnFamily)).comparator;
}
AbstractType getNameType(String keyspace, String columnFamily, ByteBuffer name)
{
CFMetaData md = metadata.get(String.format("%s.%s", keyspace, columnFamily));
try
{
if (ByteBufferUtil.string(name).equalsIgnoreCase(ByteBufferUtil.string(md.getKeyName())))
return AsciiType.instance;
}
catch (CharacterCodingException e)
{
// not be the key name
}
return md.comparator;
}
AbstractType getValueType(String keyspace, String columnFamily, ByteBuffer name)
{
CFMetaData md = metadata.get(String.format("%s.%s", keyspace, columnFamily));
try
{
if (ByteBufferUtil.string(name).equalsIgnoreCase(ByteBufferUtil.string(md.getKeyName())))
return md.getKeyValidator();
}
catch (CharacterCodingException e)
{
// not be the key name
}
ColumnDefinition cd = md.getColumnDefinition(name);
return cd == null ? md.getDefaultValidator() : cd.getValidator();
}
public AbstractType getKeyValidator(String keyspace, String columnFamily)
{
return metadata.get(String.format("%s.%s", keyspace, columnFamily)).getKeyValidator();
}
/** uses the AbstractType to map a column name to a string. */
public String colNameAsString(String keyspace, String columnFamily, ByteBuffer name)
{
AbstractType comparator = getNameType(keyspace, columnFamily, name);
return comparator.getString(name);
}
/** constructs a typed column */
public TypedColumn makeCol(String keyspace, String columnFamily, Column column)
{
return new TypedColumn(column,
getNameType(keyspace, columnFamily, column.name),
getValueType(keyspace, columnFamily, column.name));
}
}