/**
* 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.TCustomOverloadResult;
import com.foundationdb.server.types.TExecutionContext;
import com.foundationdb.server.types.TInstance;
import com.foundationdb.server.types.TScalar;
import com.foundationdb.server.types.TOverloadResult;
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 com.foundationdb.server.types.texpressions.TInputSetBuilder;
import com.foundationdb.server.types.texpressions.TScalarBase;
import com.foundationdb.util.Strings;
import java.util.Arrays;
import java.util.List;
@SuppressWarnings("unused")
public class TSpace extends TScalarBase
{
private final TClass stringType;
private final TClass intType;
public TSpace(TClass stringType, TClass intType)
{
this.stringType = stringType;
this.intType = intType;
}
@Override
protected void buildInputSets(TInputSetBuilder builder)
{
builder.covers(intType, 0);
}
@Override
protected void doEvaluate(TExecutionContext context, LazyList<? extends ValueSource> inputs, ValueTarget output)
{
int count = inputs.get(0).getInt32();
final String s;
if (count <= 0) {
s = "";
} else {
s = Strings.repeatString(" ", count);
}
output.putString(s, null);
}
@Override
public String displayName()
{
return "SPACE";
}
@Override
public TOverloadResult resultType()
{
return TOverloadResult.custom(new TCustomOverloadResult()
{
@Override
public TInstance resultInstance(List<TPreptimeValue> inputs, TPreptimeContext context)
{
ValueSource length = inputs.get(0).value();
if((length == null) || (length.isNull())) {
return stringType.instance(0, true);
} else {
return stringType.instance(length.getInt32(), false);
}
}
});
}
}