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A fork of the Apache Cassandra Project ready to embed Elasticsearch.
/*
* 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.List;
import com.google.common.base.Objects;
import org.apache.cassandra.cql3.AssignmentTestable;
import org.apache.cassandra.cql3.ColumnSpecification;
import org.apache.cassandra.db.marshal.AbstractType;
/**
* Base class for our native/hardcoded functions.
*/
public abstract class AbstractFunction implements Function
{
protected final FunctionName name;
protected final List> argTypes;
protected final AbstractType returnType;
protected AbstractFunction(FunctionName name, List> argTypes, AbstractType returnType)
{
this.name = name;
this.argTypes = argTypes;
this.returnType = returnType;
}
public FunctionName name()
{
return name;
}
public List> argTypes()
{
return argTypes;
}
public AbstractType returnType()
{
return returnType;
}
@Override
public boolean equals(Object o)
{
if (!(o instanceof AbstractFunction))
return false;
AbstractFunction that = (AbstractFunction)o;
return Objects.equal(this.name, that.name)
&& Objects.equal(this.argTypes, that.argTypes)
&& Objects.equal(this.returnType, that.returnType);
}
public void addFunctionsTo(List functions)
{
functions.add(this);
}
public boolean hasReferenceTo(Function function)
{
return false;
}
@Override
public int hashCode()
{
return Objects.hashCode(name, argTypes, returnType);
}
public final AssignmentTestable.TestResult testAssignment(String keyspace, ColumnSpecification receiver)
{
// We should ignore the fact that the receiver type is frozen in our comparison as functions do not support
// frozen types for return type
AbstractType returnType = returnType();
if (receiver.type.isFrozenCollection())
returnType = returnType.freeze();
if (receiver.type.equals(returnType))
return AssignmentTestable.TestResult.EXACT_MATCH;
if (receiver.type.isValueCompatibleWith(returnType))
return AssignmentTestable.TestResult.WEAKLY_ASSIGNABLE;
return AssignmentTestable.TestResult.NOT_ASSIGNABLE;
}
@Override
public String toString()
{
StringBuilder sb = new StringBuilder();
sb.append(name).append(" : (");
for (int i = 0; i < argTypes.size(); i++)
{
if (i > 0)
sb.append(", ");
sb.append(argTypes.get(i).asCQL3Type());
}
sb.append(") -> ").append(returnType.asCQL3Type());
return sb.toString();
}
}