package org.apache.cassandra.db.marshal;
/*
*
* 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 java.util.Collection;
import java.util.Comparator;
import org.apache.cassandra.db.IColumn;
/**
* Specifies a Comparator for a specific type of byte[].
*
* Note that empty byte[] are used to represent "start at the beginning"
* or "stop at the end" arguments to get_slice, so the Comparator
* should always handle those values even if they normally do not
* represent a valid byte[] for the type being compared.
*/
public abstract class AbstractType implements Comparator<byte[]>
{
// used in serialization of column families
public final String canonicalName = getClass().getCanonicalName();
/** get a string representation of the bytes suitable for log messages */
public abstract String getString(byte[] bytes);
/** validate that the byte array is a valid sequence for the type we are supposed to be comparing */
public void validate(byte[] bytes)
{
getString(bytes);
}
public Comparator<byte[]> getReverseComparator()
{
return new Comparator<byte[]>()
{
public int compare(byte[] o1, byte[] o2)
{
if (o1.length == 0)
{
return o2.length == 0 ? 0 : -1;
}
if (o2.length == 0)
{
return 1;
}
return -AbstractType.this.compare(o1, o2);
}
};
}
/** convenience method */
public String getString(Collection<byte[]> names)
{
StringBuilder builder = new StringBuilder();
for (byte[] name : names)
{
builder.append(getString(name)).append(",");
}
return builder.toString();
}
/** convenience method */
public String getColumnsString(Collection<IColumn> columns)
{
StringBuilder builder = new StringBuilder();
for (IColumn column : columns)
{
builder.append(column.getString(this)).append(",");
}
return builder.toString();
}
public final boolean equals(Object obj)
{
if (obj == null)
return false;
else
return obj.getClass().getName().equals(getClass().getName());
}
}