/**
* 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.server.explain.*;
import com.foundationdb.server.explain.std.TExpressionExplainer;
import com.foundationdb.server.types.ErrorHandlingMode;
import com.foundationdb.server.types.TClass;
import com.foundationdb.server.types.TExecutionContext;
import com.foundationdb.server.types.TInstance;
import com.foundationdb.server.types.TPreptimeValue;
import com.foundationdb.server.types.value.Value;
import com.foundationdb.server.types.value.ValueSource;
public final class TPreparedParameter implements TPreparedExpression {
@Override
public TPreptimeValue evaluateConstant(QueryContext queryContext) {
return new TPreptimeValue(type);
}
@Override
public TInstance resultType() {
return type;
}
@Override
public TEvaluatableExpression build() {
return new InnerEvaluation(position, type);
}
@Override
public CompoundExplainer getExplainer(ExplainContext context)
{
CompoundExplainer ex = new TExpressionExplainer(Type.VARIABLE, "Variable", context);
ex.addAttribute(Label.BINDING_POSITION, PrimitiveExplainer.getInstance(position));
return ex;
}
@Override
public String toString() {
return "Variable(pos=" + position + ')';
}
public TPreparedParameter(int position, TInstance type) {
this.position = position;
this.type = type;
}
private final int position;
private final TInstance type;
private static class InnerEvaluation implements TEvaluatableExpression {
@Override
public ValueSource resultValue() {
return value;
}
@Override
public void evaluate() {
if (!value.hasAnyValue()) { // only need to compute this once
TClass tClass = type.typeClass();
ValueSource inSource = bindings.getValue(position);
// TODO need a better execution context thinger
TExecutionContext executionContext = new TExecutionContext(
null,
null,
type,
context,
ErrorHandlingMode.WARN,
ErrorHandlingMode.WARN,
ErrorHandlingMode.WARN
);
tClass.fromObject(executionContext, inSource, value);
}
}
@Override
public void with(Row row) {
}
@Override
public void with(QueryContext context) {
this.context = context;
}
@Override
public void with(QueryBindings bindings) {
this.bindings = bindings;
}
private InnerEvaluation(int position, TInstance type) {
this.position = position;
this.type = type;
this.value = new Value(type);
}
private final int position;
private final Value value;
private QueryContext context;
private QueryBindings bindings;
private final TInstance type;
}
}