/**
* 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.TInstance;
import com.foundationdb.server.types.TPreptimeValue;
import com.foundationdb.server.types.value.ValueSource;
import com.foundationdb.server.types.value.ValueSources;
import com.foundationdb.util.AkibanAppender;
public final class TPreparedLiteral implements TPreparedExpression {
@Override
public TInstance resultType() {
return type;
}
@Override
public TEvaluatableExpression build() {
return new Evaluation(value);
}
@Override
public CompoundExplainer getExplainer(ExplainContext context)
{
CompoundExplainer ex = new TExpressionExplainer(Type.LITERAL, "Literal", context);
StringBuilder sql = new StringBuilder();
if (type == null)
sql.append("NULL");
else
type.formatAsLiteral(value, AkibanAppender.of(sql));
ex.addAttribute(Label.OPERAND, PrimitiveExplainer.getInstance(sql.toString()));
return ex;
}
@Override
public TPreptimeValue evaluateConstant(QueryContext queryContext) {
if (type == null)
return new TPreptimeValue(null, null);
else
return new TPreptimeValue(type, value);
}
@Override
public String toString() {
if (type == null)
return "LiteralNull";
StringBuilder sb = new StringBuilder("Literal(");
type.format(value, AkibanAppender.of(sb));
sb.append(')');
return sb.toString();
}
public TPreparedLiteral(TInstance type, ValueSource value) {
if (type == null) {
this.type = null;
this.value = ValueSources.getNullSource(null);
}
else {
this.type = type;
this.value = value;
}
}
private final TInstance type;
private final ValueSource value;
private static class Evaluation implements TEvaluatableExpression {
@Override
public ValueSource resultValue() {
return value;
}
@Override
public void evaluate() {
}
@Override
public void with(Row row) {
}
@Override
public void with(QueryContext context) {
}
@Override
public void with(QueryBindings bindings) {
}
private Evaluation(ValueSource value) {
this.value = value;
}
private final ValueSource value;
}
}