package org.apache.cassandra.cql3;
import org.apache.cassandra.db.marshal.AbstractType;
import org.apache.cassandra.exceptions.InvalidRequestException;
public class TypeCast extends Term.Raw
{
private final CQL3Type.Raw type;
private final Term.Raw term;
public TypeCast(CQL3Type.Raw type, Term.Raw term)
{
this.type = type;
this.term = term;
}
public Term prepare(String keyspace, ColumnSpecification receiver) throws InvalidRequestException
{
if (!term.testAssignment(keyspace, castedSpecOf(keyspace, receiver)).isAssignable())
throw new InvalidRequestException(String.format("Cannot cast value %s to type %s", term, type));
if (!testAssignment(keyspace, receiver).isAssignable())
throw new InvalidRequestException(String.format("Cannot assign value %s to %s of type %s", this, receiver.name, receiver.type.asCQL3Type()));
return term.prepare(keyspace, receiver);
}
private ColumnSpecification castedSpecOf(String keyspace, ColumnSpecification receiver) throws InvalidRequestException
{
return new ColumnSpecification(receiver.ksName, receiver.cfName, new ColumnIdentifier(toString(), true), type.prepare(keyspace).getType());
}
public AssignmentTestable.TestResult testAssignment(String keyspace, ColumnSpecification receiver)
{
AbstractType<?> castedType = type.prepare(keyspace).getType();
if (receiver.type.equals(castedType))
return AssignmentTestable.TestResult.EXACT_MATCH;
else if (receiver.type.isValueCompatibleWith(castedType))
return AssignmentTestable.TestResult.WEAKLY_ASSIGNABLE;
else
return AssignmentTestable.TestResult.NOT_ASSIGNABLE;
}
public AbstractType<?> getExactTypeIfKnown(String keyspace)
{
return type.prepare(keyspace).getType();
}
public String getText()
{
return "(" + type + ")" + term;
}
}