/**
* Copyright (C) 2009-2013 FoundationDB, LLC
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package com.foundationdb.sql.optimizer.plan;
import com.foundationdb.server.collation.AkCollator;
import com.foundationdb.server.collation.AkCollatorFactory;
import com.foundationdb.server.types.TInstance;
import com.foundationdb.server.types.TPreptimeValue;
import com.foundationdb.sql.types.CharacterTypeAttributes;
import com.foundationdb.sql.types.DataTypeDescriptor;
import com.foundationdb.sql.parser.ValueNode;
/** An evaluated value.
* Usually part of a larger expression tree.
*/
public abstract class BaseExpression extends BasePlanElement implements ExpressionNode
{
private DataTypeDescriptor sqlType;
private ValueNode sqlSource;
private TPreptimeValue preptimeValue;
protected BaseExpression(DataTypeDescriptor sqlType, ValueNode sqlSource,
TInstance type) {
this.sqlType = sqlType;
this.sqlSource = sqlSource;
if (type != null)
this.preptimeValue = new TPreptimeValue(type);
}
@Override
public DataTypeDescriptor getSQLtype() {
return sqlType;
}
@Override
public ValueNode getSQLsource() {
return sqlSource;
}
@Override
public void setSQLtype(DataTypeDescriptor type) {
this.sqlType = type;
}
@Override
public AkCollator getCollator() {
if (sqlType != null) {
CharacterTypeAttributes att = sqlType.getCharacterAttributes();
if (att != null) {
String coll = att.getCollation();
if (coll != null)
return AkCollatorFactory.getAkCollator(coll);
}
}
return null;
}
@Override
public boolean isColumn() {
return false;
}
@Override
public boolean isConstant() {
return false;
}
@Override
protected void deepCopy(DuplicateMap map) {
super.deepCopy(map);
// Don't clone AST or type.
}
@Override
public TPreptimeValue getPreptimeValue() {
return preptimeValue;
}
@Override
public void setPreptimeValue(TPreptimeValue value) {
this.preptimeValue = value;
}
@Override
public TInstance getType() {
if (preptimeValue == null)
return null;
else
return preptimeValue.type();
}
}