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The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model.
/*
* 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.db;
import java.util.*;
import com.google.common.collect.Iterators;
import org.apache.cassandra.config.ColumnDefinition;
import org.apache.cassandra.utils.btree.BTreeSet;
import static java.util.Comparator.naturalOrder;
/**
* Columns (or a subset of the columns) that a partition contains.
* This mainly groups both static and regular columns for convenience.
*/
public class PartitionColumns implements Iterable
{
public static PartitionColumns NONE = new PartitionColumns(Columns.NONE, Columns.NONE);
public final Columns statics;
public final Columns regulars;
public PartitionColumns(Columns statics, Columns regulars)
{
assert statics != null && regulars != null;
this.statics = statics;
this.regulars = regulars;
}
public static PartitionColumns of(ColumnDefinition column)
{
return new PartitionColumns(column.isStatic() ? Columns.of(column) : Columns.NONE,
column.isStatic() ? Columns.NONE : Columns.of(column));
}
public PartitionColumns without(ColumnDefinition column)
{
return new PartitionColumns(column.isStatic() ? statics.without(column) : statics,
column.isStatic() ? regulars : regulars.without(column));
}
public PartitionColumns withoutStatics()
{
return statics.isEmpty() ? this : new PartitionColumns(Columns.NONE, regulars);
}
public PartitionColumns mergeTo(PartitionColumns that)
{
if (this == that)
return this;
Columns statics = this.statics.mergeTo(that.statics);
Columns regulars = this.regulars.mergeTo(that.regulars);
if (statics == this.statics && regulars == this.regulars)
return this;
if (statics == that.statics && regulars == that.regulars)
return that;
return new PartitionColumns(statics, regulars);
}
public boolean isEmpty()
{
return statics.isEmpty() && regulars.isEmpty();
}
public Columns columns(boolean isStatic)
{
return isStatic ? statics : regulars;
}
public boolean contains(ColumnDefinition column)
{
return column.isStatic() ? statics.contains(column) : regulars.contains(column);
}
public boolean includes(PartitionColumns columns)
{
return statics.containsAll(columns.statics) && regulars.containsAll(columns.regulars);
}
public Iterator iterator()
{
return Iterators.concat(statics.iterator(), regulars.iterator());
}
public Iterator selectOrderIterator()
{
return Iterators.concat(statics.selectOrderIterator(), regulars.selectOrderIterator());
}
/** * Returns the total number of static and regular columns. */
public int size()
{
return regulars.size() + statics.size();
}
@Override
public String toString()
{
StringBuilder sb = new StringBuilder();
sb.append("[").append(statics).append(" | ").append(regulars).append("]");
return sb.toString();
}
@Override
public boolean equals(Object other)
{
if (!(other instanceof PartitionColumns))
return false;
PartitionColumns that = (PartitionColumns)other;
return this.statics.equals(that.statics)
&& this.regulars.equals(that.regulars);
}
@Override
public int hashCode()
{
return Objects.hash(statics, regulars);
}
public static Builder builder()
{
return new Builder();
}
public static class Builder
{
// Note that we do want to use sorted sets because we want the column definitions to be compared
// through compareTo, not equals. The former basically check it's the same column name, while the latter
// check it's the same object, including the same type.
private BTreeSet.Builder regularColumns;
private BTreeSet.Builder staticColumns;
public Builder add(ColumnDefinition c)
{
if (c.isStatic())
{
if (staticColumns == null)
staticColumns = BTreeSet.builder(naturalOrder());
staticColumns.add(c);
}
else
{
assert c.isRegular();
if (regularColumns == null)
regularColumns = BTreeSet.builder(naturalOrder());
regularColumns.add(c);
}
return this;
}
public Builder addAll(Iterable columns)
{
for (ColumnDefinition c : columns)
add(c);
return this;
}
public Builder addAll(PartitionColumns columns)
{
if (regularColumns == null && !columns.regulars.isEmpty())
regularColumns = BTreeSet.builder(naturalOrder());
for (ColumnDefinition c : columns.regulars)
regularColumns.add(c);
if (staticColumns == null && !columns.statics.isEmpty())
staticColumns = BTreeSet.builder(naturalOrder());
for (ColumnDefinition c : columns.statics)
staticColumns.add(c);
return this;
}
public PartitionColumns build()
{
return new PartitionColumns(staticColumns == null ? Columns.NONE : Columns.from(staticColumns.build()),
regularColumns == null ? Columns.NONE : Columns.from(regularColumns.build()));
}
}
}