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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.cql3;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import org.apache.cassandra.cql3.functions.Function;
import org.apache.cassandra.cql3.statements.StatementType;
import com.google.common.collect.Iterators;
/**
* A set of Operation
s.
*
*/
public final class Operations implements Iterable
{
/**
* The type of statement.
*/
private final StatementType type;
/**
* The operations on regular columns.
*/
private final List regularOperations = new ArrayList<>();
/**
* The operations on static columns.
*/
private final List staticOperations = new ArrayList<>();
public Operations(StatementType type)
{
this.type = type;
}
/**
* Checks if some of the operations apply to static columns.
*
* @return true
if some of the operations apply to static columns, false
otherwise.
*/
public boolean appliesToStaticColumns()
{
return !staticOperations.isEmpty();
}
/**
* Checks if some of the operations apply to regular columns.
*
* @return true
if some of the operations apply to regular columns, false
otherwise.
*/
public boolean appliesToRegularColumns()
{
// If we have regular operations, this applies to regular columns.
// Otherwise, if the statement is a DELETE and staticOperations is also empty, this means we have no operations,
// which for a DELETE means a full row deletion. Which means the operation applies to all columns and regular ones in particular.
return !regularOperations.isEmpty() || (type.isDelete() && staticOperations.isEmpty());
}
/**
* Returns the operation on regular columns.
* @return the operation on regular columns
*/
public List regularOperations()
{
return regularOperations;
}
/**
* Returns the operation on static columns.
* @return the operation on static columns
*/
public List staticOperations()
{
return staticOperations;
}
/**
* Adds the specified Operation
to this set of operations.
* @param operation the operation to add
*/
public void add(Operation operation)
{
if (operation.column.isStatic())
staticOperations.add(operation);
else
regularOperations.add(operation);
}
/**
* Checks if one of the operations requires a read.
*
* @return true
if one of the operations requires a read, false
otherwise.
*/
public boolean requiresRead()
{
// Lists SET operation incurs a read.
for (Operation operation : this)
if (operation.requiresRead())
return true;
return false;
}
/**
* Checks if this Operations
is empty.
* @return true
if this Operations
is empty, false
otherwise.
*/
public boolean isEmpty()
{
return staticOperations.isEmpty() && regularOperations.isEmpty();
}
/**
* {@inheritDoc}
*/
@Override
public Iterator iterator()
{
return Iterators.concat(staticOperations.iterator(), regularOperations.iterator());
}
public void addFunctionsTo(List functions)
{
regularOperations.forEach(p -> p.addFunctionsTo(functions));
staticOperations.forEach(p -> p.addFunctionsTo(functions));
}
}