/*
* Copyright (c) 2013, OpenCloudDB/MyCAT and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software;Designed and Developed mainly by many Chinese
* opensource volunteers. you can redistribute it and/or modify it under the
* terms of the GNU General Public License version 2 only, as published by the
* Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Any questions about this component can be directed to it's project Web address
* https://code.google.com/p/opencloudb/.
*
*/
package com.akiban.sql.compiler;
import com.akiban.sql.parser.*;
import com.akiban.sql.StandardException;
import com.akiban.sql.types.DataTypeDescriptor;
import com.akiban.sql.types.TypeId;
/**
* This class implements TypeCompiler for the SQL char datatypes.
*
*/
public final class CharTypeCompiler extends TypeCompiler
{
protected CharTypeCompiler(TypeId typeId) {
super(typeId);
}
/**
* Tell whether this type (char) can be converted to the given type.
*
* @see TypeCompiler#convertible
*/
public boolean convertible(TypeId otherType, boolean forDataTypeFunction) {
if (otherType.isAnsiUDT()) {
return false;
}
// LONGVARCHAR can only be converted from character types
// or CLOB or boolean.
if (getTypeId().isLongVarcharTypeId()) {
return (otherType.isStringTypeId() || otherType.isBooleanTypeId());
}
// The double function can convert CHAR and VARCHAR
if (forDataTypeFunction && otherType.isDoubleTypeId())
return (getTypeId().isStringTypeId());
// can't CAST to CHAR and VARCHAR from REAL or DOUBLE
// or binary types or XML
// all other types are ok.
if (otherType.isFloatingPointTypeId() || otherType.isBitTypeId() ||
otherType.isBlobTypeId() || otherType.isXMLTypeId())
return false;
return true;
}
/**
* Tell whether this type (char) is compatible with the given type.
*
* @param otherType The TypeId of the other type.
*/
public boolean compatible(TypeId otherType) {
return (otherType.isStringTypeId() ||
(otherType.isDateTimeTimeStampTypeId() &&
!getTypeId().isLongVarcharTypeId()));
}
/**
* @see TypeCompiler#getCorrespondingPrimitiveTypeName
*/
public String getCorrespondingPrimitiveTypeName() {
/* Only numerics and booleans get mapped to Java primitives */
return "java.lang.String";
}
/**
* Get the method name for getting out the corresponding primitive
* Java type.
*
* @return String The method call name for getting the
* corresponding primitive Java type.
*/
public String getPrimitiveMethodName() {
return "getString";
}
/**
* @see TypeCompiler#getCastToCharWidth
*/
public int getCastToCharWidth(DataTypeDescriptor dts) {
return dts.getMaximumWidth();
}
}