/**
* 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.server.explain.*;
import com.foundationdb.server.types.LazyList;
import com.foundationdb.server.types.ReversedLazyList;
import com.foundationdb.server.types.TClass;
import com.foundationdb.server.types.TExecutionContext;
import com.foundationdb.server.types.TInputSet;
import com.foundationdb.server.types.TInstance;
import com.foundationdb.server.types.TScalar;
import com.foundationdb.server.types.TPreptimeContext;
import com.foundationdb.server.types.TPreptimeValue;
import com.foundationdb.server.types.value.ValueSource;
import com.foundationdb.server.types.value.ValueTarget;
import java.util.List;
public final class TValidatedScalar extends TValidatedOverload implements TScalar {
// TOverload methods (straight delegation)
@Override
public TPreptimeValue evaluateConstant(TPreptimeContext context, LazyList<? extends TPreptimeValue> inputs) {
return scalar.evaluateConstant(context, inputs);
}
@Override
public void finishPreptimePhase(TPreptimeContext context) {
scalar.finishPreptimePhase(context);
}
@Override
public void evaluate(TExecutionContext context, LazyList<? extends ValueSource> inputs, ValueTarget output) {
scalar.evaluate(context, inputs, output);
}
@Override
public String toString(List<? extends TPreparedExpression> inputs, TInstance resultType) {
return scalar.toString(inputs, resultType);
}
@Override
public CompoundExplainer getExplainer(ExplainContext context, List<? extends TPreparedExpression> inputs, TInstance resultType)
{
return scalar.getExplainer(context, inputs, resultType);
}
public <T> LazyList<? extends T> filterInputs(LazyList<? extends T> inputs) {
return commuted ? new ReversedLazyList<>(inputs) : inputs;
}
public TValidatedScalar createCommuted() {
if (!coversExactlyNArgs(2))
throw new IllegalStateException("commuted overloads must take exactly two arguments: " + this);
TClass origArg1 = inputSetAt(1).targetType();
TClass origArg0 = inputSetAt(0).targetType();
if (origArg0 == origArg1)
throw new IllegalStateException("two-arg overload has same target class for both operands, so commuting "
+ "it makes no sense: " + this);
TInputSetBuilder builder = new TInputSetBuilder();
builder.covers(origArg1, 0);
builder.covers(origArg0, 1);
List<TInputSet> commutedInputSets = builder.toList();
return new TValidatedScalar(scalar, commutedInputSets, true);
}
public TValidatedScalar(TScalar scalar) {
this(scalar, scalar.inputSets(), false);
}
private TValidatedScalar(TScalar scalar, List<TInputSet> inputSets, boolean commuted) {
super(scalar, inputSets);
this.commuted = commuted;
this.scalar = scalar;
}
private final TScalar scalar;
private final boolean commuted;
}