/**
* 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.aksql.akfuncs;
import com.foundationdb.server.types.LazyList;
import com.foundationdb.server.types.TExecutionContext;
import com.foundationdb.server.types.TScalar;
import com.foundationdb.server.types.TOverloadResult;
import com.foundationdb.server.types.aksql.aktypes.AkBool;
import com.foundationdb.server.types.value.ValueSource;
import com.foundationdb.server.types.value.ValueTarget;
import com.foundationdb.server.types.value.ValueTargets;
import com.foundationdb.server.types.texpressions.TInputSetBuilder;
import com.foundationdb.server.types.texpressions.TScalarBase;
public class AkIfElse extends TScalarBase
{
public static final TScalar INSTANCE = new AkIfElse();
@Override
protected void buildInputSets(TInputSetBuilder builder)
{
builder.covers(AkBool.INSTANCE, 0).pickingCovers(null, 1, 2);
}
@Override
protected void doEvaluate(TExecutionContext context, LazyList<? extends ValueSource> inputs, ValueTarget output)
{
ValueSource condition = inputs.get(0);
int whichSource = (!condition.isNull() && condition.getBoolean()) ? 1 : 2;
ValueSource source = inputs.get(whichSource);
ValueTargets.copyFrom(source, output);
}
@Override
protected boolean nullContaminates(int inputIndex) {
return false;
}
@Override
public String displayName()
{
return "IF";
}
@Override
public TOverloadResult resultType()
{
return TOverloadResult.picking();
}
private AkIfElse() {}
}