CharTypeCompiler.java
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org.apache.derby.impl.sql.compile |
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Apache Derby |
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These are the metrics that contribute to the Enerjy Score for this file, ranked by impact. So the metrics listed at the top influence the score to a greater extent that the metrics listed at the bottom.
/*
Derby - Class org.apache.derby.impl.sql.compile.CharTypeCompiler
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.derby.impl.sql.compile;
import org.apache.derby.iapi.services.loader.ClassFactory;
import org.apache.derby.iapi.services.sanity.SanityManager;
import org.apache.derby.iapi.services.compiler.LocalField;
import org.apache.derby.iapi.services.compiler.MethodBuilder;
import org.apache.derby.iapi.services.io.StoredFormatIds;
import org.apache.derby.iapi.types.StringDataValue;
import org.apache.derby.iapi.types.TypeId;
import org.apache.derby.iapi.types.DataTypeDescriptor;
import org.apache.derby.iapi.sql.compile.TypeCompiler;
import org.apache.derby.iapi.reference.ClassName;
/**
* This class implements TypeCompiler for the SQL char datatypes.
*
*/
public final class CharTypeCompiler extends BaseTypeCompiler
{
/**
* Tell whether this type (char) can be converted to the given type.
*
* @see TypeCompiler#convertible
*/
public boolean convertible(TypeId otherType, boolean forDataTypeFunction)
{
// LONGVARCHAR can only be converted from character types
// or CLOB.
if (getTypeId().isLongVarcharTypeId())
{
return (otherType.isStringTypeId());
}
// 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()));
}
/**
* Tell whether this type (char) can be stored into from the given type.
*
* @param otherType The TypeId of the other type.
* @param cf A ClassFactory
*/
public boolean storable(TypeId otherType, ClassFactory cf)
{
// Same rules as cast except we can't assign from numbers
if (convertible(otherType,false) &&
!otherType.isBlobTypeId() &&
!otherType.isNumericTypeId())
return true;
/*
** If the other type is user-defined, use the java types to determine
** assignability.
*/
return userTypeStorable(getTypeId(), otherType, cf);
}
/** @see TypeCompiler#interfaceName */
public String interfaceName()
{
return ClassName.StringDataValue;
}
/**
* @see TypeCompiler#getCorrespondingPrimitiveTypeName
*/
public String getCorrespondingPrimitiveTypeName()
{
/* Only numerics and booleans get mapped to Java primitives */
return "java.lang.String";
}
/**
* @see TypeCompiler#getCastToCharWidth
*/
public int getCastToCharWidth(DataTypeDescriptor dts)
{
return dts.getMaximumWidth();
}
String nullMethodName()
{
int formatId = getStoredFormatIdFromTypeId();
switch (formatId)
{
case StoredFormatIds.CHAR_TYPE_ID:
return "getNullChar";
case StoredFormatIds.LONGVARCHAR_TYPE_ID:
return "getNullLongvarchar";
case StoredFormatIds.VARCHAR_TYPE_ID:
return "getNullVarchar";
default:
if (SanityManager.DEBUG)
{
SanityManager.THROWASSERT(
"unexpected formatId in nullMethodName() - " + formatId);
}
return null;
}
}
/**
* Push the collation type if it is not COLLATION_TYPE_UCS_BASIC.
*
* @param collationType Collation type of character values.
* @return true collationType will be pushed, false collationType will be ignored.
*/
boolean pushCollationForDataValue(int collationType)
{
return collationType != StringDataValue.COLLATION_TYPE_UCS_BASIC;
}
String dataValueMethodName()
{
int formatId = getStoredFormatIdFromTypeId();
switch (formatId)
{
case StoredFormatIds.CHAR_TYPE_ID:
return "getCharDataValue";
case StoredFormatIds.LONGVARCHAR_TYPE_ID:
return "getLongvarcharDataValue";
case StoredFormatIds.VARCHAR_TYPE_ID:
return "getVarcharDataValue";
default:
if (SanityManager.DEBUG)
{
SanityManager.THROWASSERT(
"unexpected formatId in dataValueMethodName() - " + formatId);
}
return null;
}
}
}
The table below shows all metrics for CharTypeCompiler.java.




