/**
* 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.server.types.texpressions;
import com.foundationdb.qp.operator.QueryBindings;
import com.foundationdb.qp.operator.QueryContext;
import com.foundationdb.qp.row.Row;
import com.foundationdb.qp.rowtype.RowType;
import com.foundationdb.server.explain.*;
import com.foundationdb.server.types.TInstance;
import com.foundationdb.server.types.TPreptimeValue;
import com.foundationdb.server.types.value.ValueSource;
public final class TPreparedBoundField implements TPreparedExpression {
@Override
public TPreptimeValue evaluateConstant(QueryContext queryContext) {
return new TPreptimeValue(resultType());
}
@Override
public TInstance resultType() {
return fieldExpression.resultType();
}
@Override
public TEvaluatableExpression build() {
return new InnerEvaluation(fieldExpression.build(), rowPosition);
}
@Override
public CompoundExplainer getExplainer(ExplainContext context)
{
// Extend Field inside, rather than wrapping it.
CompoundExplainer ex = fieldExpression.getExplainer(context);
ex.get().remove(Label.NAME); // Want to replace.
ex.addAttribute(Label.NAME, PrimitiveExplainer.getInstance("Bound"));
ex.addAttribute(Label.BINDING_POSITION, PrimitiveExplainer.getInstance(rowPosition));
if (context.hasExtraInfo(this))
ex.get().putAll(context.getExtraInfo(this).get());
return ex;
}
@Override
public String toString() {
return "Bound(" + rowPosition + ',' + fieldExpression + ')';
}
@Override
public boolean isLiteral() {
return false;
}
public TPreparedBoundField(RowType rowType, int rowPosition, int fieldPosition) {
fieldExpression = new TPreparedField(rowType.typeAt(fieldPosition), fieldPosition);
this.rowPosition = rowPosition;
}
private final TPreparedField fieldExpression;
private final int rowPosition;
private static class InnerEvaluation implements TEvaluatableExpression {
@Override
public ValueSource resultValue() {
return fieldEvaluation.resultValue();
}
@Override
public void evaluate() {
fieldEvaluation.evaluate();
}
@Override
public void with(Row row) {
}
@Override
public void with(QueryContext context) {
fieldEvaluation.with(context);
}
@Override
public void with(QueryBindings bindings) {
fieldEvaluation.with(bindings.getRow(rowPosition));
}
private InnerEvaluation(TEvaluatableExpression fieldEvaluation, int rowPosition) {
this.fieldEvaluation = fieldEvaluation;
this.rowPosition = rowPosition;
}
private final TEvaluatableExpression fieldEvaluation;
private final int rowPosition;
}
}