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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.functions;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;
import javax.annotation.Nullable;
import org.apache.cassandra.cql3.AssignmentTestable;
import org.apache.cassandra.cql3.CQL3Type;
import org.apache.cassandra.cql3.selection.Selectable;
import org.apache.cassandra.db.marshal.AbstractType;
import org.apache.cassandra.db.marshal.CollectionType;
import org.apache.cassandra.db.marshal.ListType;
import org.apache.cassandra.db.marshal.MapType;
import org.apache.cassandra.db.marshal.NumberType;
import org.apache.cassandra.db.marshal.SetType;
import org.apache.cassandra.db.marshal.VectorType;
import org.apache.cassandra.exceptions.InvalidRequestException;
import static java.lang.String.format;
import static org.apache.cassandra.cql3.AssignmentTestable.TestResult.NOT_ASSIGNABLE;
/**
* Generic, loose definition of a function parameter, able to infer the specific data type of the parameter in the
* function specifically built by a {@link FunctionFactory} for a particular function call.
*/
public interface FunctionParameter
{
/**
* Tries to infer the data type of the parameter for an argument in a call to the function.
*
* @param keyspace the current keyspace
* @param arg a parameter value in a specific function call
* @param receiverType the type of the object that will receive the result of the function call
* @param inferredTypes the types that have been inferred for the other parameters
* @return the inferred data type of the parameter, or {@link null} it isn't possible to infer it
*/
@Nullable
default AbstractType inferType(String keyspace,
AssignmentTestable arg,
@Nullable AbstractType receiverType,
@Nullable List> inferredTypes)
{
return arg.getCompatibleTypeIfKnown(keyspace);
}
void validateType(FunctionName name, AssignmentTestable arg, AbstractType argType);
/**
* @return whether this parameter is optional
*/
default boolean isOptional()
{
return false;
}
/**
* @param wrapped the wrapped parameter
* @return a function parameter definition that accepts the specified wrapped parameter, considering it optional as
* defined by {@link #isOptional()}.
*/
static FunctionParameter optional(FunctionParameter wrapped)
{
return new FunctionParameter()
{
@Nullable
@Override
public AbstractType inferType(String keyspace,
AssignmentTestable arg,
@Nullable AbstractType receiverType,
@Nullable List> inferredTypes)
{
return wrapped.inferType(keyspace, arg, receiverType, inferredTypes);
}
@Override
public void validateType(FunctionName name, AssignmentTestable arg, AbstractType argType)
{
wrapped.validateType(name, arg, argType);
}
@Override
public boolean isOptional()
{
return true;
}
@Override
public String toString()
{
return '[' + wrapped.toString() + ']';
}
};
}
/**
* @return a function parameter definition that accepts values of string-based data types (text, varchar and ascii)
*/
static FunctionParameter string()
{
return fixed(CQL3Type.Native.TEXT, CQL3Type.Native.VARCHAR, CQL3Type.Native.ASCII);
}
/**
* @param types the accepted data types
* @return a function parameter definition that accepts values of a specific data type
*/
static FunctionParameter fixed(CQL3Type... types)
{
assert types.length > 0;
return new FunctionParameter()
{
@Override
public AbstractType inferType(String keyspace,
AssignmentTestable arg,
@Nullable AbstractType receiverType,
@Nullable List> inferredTypes)
{
AbstractType inferred = arg.getCompatibleTypeIfKnown(keyspace);
return inferred != null ? inferred : types[0].getType();
}
@Override
public void validateType(FunctionName name, AssignmentTestable arg, AbstractType argType)
{
if (Arrays.stream(types).allMatch(t -> argType.testAssignment(t.getType()) == NOT_ASSIGNABLE))
throw new InvalidRequestException(format("Function %s requires an argument of type %s, " +
"but found argument %s of type %s",
name, this, arg, argType.asCQL3Type()));
}
@Override
public String toString()
{
if (types.length == 1)
return types[0].toString();
return '[' + Arrays.stream(types).map(Object::toString).collect(Collectors.joining("|")) + ']';
}
};
}
/**
* @param inferFromReceiver whether the parameter should try to use the function receiver to infer its data type
* @return a function parameter definition that accepts columns of any data type
*/
static FunctionParameter anyType(boolean inferFromReceiver)
{
return new FunctionParameter()
{
@Override
public AbstractType inferType(String keyspace,
AssignmentTestable arg,
@Nullable AbstractType receiverType,
@Nullable List> inferredTypes)
{
AbstractType type = arg.getCompatibleTypeIfKnown(keyspace);
return type == null && inferFromReceiver ? receiverType : type;
}
@Override
public void validateType(FunctionName name, AssignmentTestable arg, AbstractType argType)
{
// nothing to do here, all types are accepted
}
@Override
public String toString()
{
return "any";
}
};
}
/**
* @param index the index of the function argument that this parameter is associated with
* @param preferOther whether the parameter should prefer the type of the other parameter over its own type
* @param parameter the type of this parameter when the type of the associated parameter is unknown
* @return a function parameter definition that is expected to have the same type as another parameter
*/
static FunctionParameter sameAs(int index, boolean preferOther, FunctionParameter parameter)
{
return new FunctionParameter()
{
@Override
public AbstractType inferType(String keyspace,
AssignmentTestable arg,
@Nullable AbstractType receiverType,
@Nullable List> inferredTypes)
{
if (preferOther)
{
AbstractType other = inferredTypes == null ? null : inferredTypes.get(index);
return other == null ? parameter.inferType(keyspace, arg, receiverType, inferredTypes) : other;
}
AbstractType inferred = parameter.inferType(keyspace, arg, receiverType, inferredTypes);
return inferred == null && inferredTypes != null ? inferredTypes.get(index) : inferred;
}
@Override
public void validateType(FunctionName name, AssignmentTestable arg, AbstractType argType)
{
parameter.validateType(name, arg, argType);
}
@Override
public String toString()
{
return parameter.toString();
}
};
}
/**
* @return a function parameter definition that accepts values of type {@link CollectionType}, independently of the
* types of its elements.
*/
static FunctionParameter anyCollection()
{
return new FunctionParameter()
{
@Override
public void validateType(FunctionName name, AssignmentTestable arg, AbstractType argType)
{
if (!argType.isCollection())
throw new InvalidRequestException(format("Function %s requires a collection argument, " +
"but found argument %s of type %s",
name, arg, argType.asCQL3Type()));
}
@Override
public String toString()
{
return "collection";
}
};
}
/**
* @return a function parameter definition that accepts values of type {@link SetType} or {@link ListType}.
*/
static FunctionParameter setOrList()
{
return new FunctionParameter()
{
@Override
public void validateType(FunctionName name, AssignmentTestable arg, AbstractType argType)
{
if (argType.isCollection())
{
CollectionType.Kind kind = ((CollectionType) argType).kind;
if (kind == CollectionType.Kind.SET || kind == CollectionType.Kind.LIST)
return;
}
throw new InvalidRequestException(format("Function %s requires a set or list argument, " +
"but found argument %s of type %s",
name, arg, argType.asCQL3Type()));
}
@Override
public String toString()
{
return "numeric_set_or_list";
}
};
}
/**
* @return a function parameter definition that accepts values of type {@link SetType} or {@link ListType},
* provided that its elements are numeric.
*/
static FunctionParameter numericSetOrList()
{
return new FunctionParameter()
{
@Override
public void validateType(FunctionName name, AssignmentTestable arg, AbstractType argType)
{
AbstractType elementType = null;
if (argType.isCollection())
{
CollectionType collectionType = (CollectionType) argType;
if (collectionType.kind == CollectionType.Kind.SET)
{
elementType = ((SetType) argType).getElementsType();
}
else if (collectionType.kind == CollectionType.Kind.LIST)
{
elementType = ((ListType) argType).getElementsType();
}
}
if (!(elementType instanceof NumberType))
throw new InvalidRequestException(format("Function %s requires a numeric set/list argument, " +
"but found argument %s of type %s",
name, arg, argType.asCQL3Type()));
}
@Override
public String toString()
{
return "numeric_set_or_list";
}
};
}
/**
* @return a function parameter definition that accepts values of type {@link MapType}, independently of the types
* of the map keys and values.
*/
static FunctionParameter anyMap()
{
return new FunctionParameter()
{
@Override
public void validateType(FunctionName name, AssignmentTestable arg, AbstractType argType)
{
if (!argType.isUDT() && !(argType instanceof MapType))
throw new InvalidRequestException(format("Function %s requires a map argument, " +
"but found argument %s of type %s",
name, arg, argType.asCQL3Type()));
}
@Override
public String toString()
{
return "map";
}
};
}
/**
* @param type the type of the vector elements
* @return a function parameter definition that accepts values of type {@link VectorType} with elements of the
* specified {@code type} and any dimensions.
*/
static FunctionParameter vector(CQL3Type type)
{
return new FunctionParameter()
{
@Override
public AbstractType inferType(String keyspace,
AssignmentTestable arg,
@Nullable AbstractType receiverType,
@Nullable List> inferredTypes)
{
if (arg instanceof Selectable.WithArrayLiteral)
return VectorType.getInstance(type.getType(), ((Selectable.WithArrayLiteral) arg).getSize());
AbstractType inferred = arg.getCompatibleTypeIfKnown(keyspace);
return inferred == null ? receiverType : inferred;
}
@Override
public void validateType(FunctionName name, AssignmentTestable arg, AbstractType argType)
{
if (argType.isVector())
{
VectorType vectorType = (VectorType) argType;
if (vectorType.elementType.asCQL3Type() == type)
return;
}
else if (argType instanceof ListType) // if it's terminal it will be a list
{
ListType listType = (ListType) argType;
if (listType.getElementsType().testAssignment(type.getType()) == NOT_ASSIGNABLE)
return;
}
throw new InvalidRequestException(format("Function %s requires a %s vector argument, " +
"but found argument %s of type %s",
name, type, arg, argType.asCQL3Type()));
}
@Override
public String toString()
{
return format("vector<%s, n>", type);
}
};
}
}
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