/**
* 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.common.funcs;
import com.foundationdb.server.types.LazyList;
import com.foundationdb.server.types.TClass;
import com.foundationdb.server.types.TExecutionContext;
import com.foundationdb.server.types.TScalar;
import com.foundationdb.server.types.TOverloadResult;
import com.foundationdb.server.types.value.ValueSource;
import com.foundationdb.server.types.value.ValueTarget;
import com.foundationdb.server.types.texpressions.TInputSetBuilder;
import com.foundationdb.server.types.texpressions.TScalarBase;
public abstract class IsTrueFalseUnknown extends TScalarBase
{
public static TScalar[] create (TClass boolType)
{
return new TScalar[]
{
new IsTrueFalseUnknown(boolType, "isTrue")
{
@Override
protected void evaluate(ValueSource source, ValueTarget target)
{
target.putBool(source.getBoolean(false));
}
},
new IsTrueFalseUnknown(boolType, "isFalse")
{
@Override
protected void evaluate(ValueSource source, ValueTarget target)
{
target.putBool(!source.getBoolean(true));
}
},
new IsTrueFalseUnknown(boolType, "isUnknown")
{
@Override
protected void evaluate(ValueSource source, ValueTarget target)
{
target.putBool(source.isNull());
}
}
};
}
protected abstract void evaluate(ValueSource source, ValueTarget target);
private final TClass boolType;
private final String name;
private IsTrueFalseUnknown(TClass boolType, String name)
{
this.boolType = boolType;
this.name = name;
}
@Override
protected void buildInputSets(TInputSetBuilder builder)
{
builder.covers(boolType, 0);
}
@Override
protected boolean nullContaminates(int inputIndex) {
return false;
}
@Override
public void evaluate(TExecutionContext context, LazyList<? extends ValueSource> inputs, ValueTarget output)
{
evaluate(inputs.get(0), output);
}
@Override
protected void doEvaluate(TExecutionContext context, LazyList<? extends ValueSource> inputs, ValueTarget output)
{
// DOES NOTHING
}
@Override
public String displayName()
{
return name;
}
@Override
public TOverloadResult resultType()
{
return TOverloadResult.fixed(boolType);
}
}