/**
* 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.mcompat.mfuncs;
import com.foundationdb.server.explain.*;
import com.foundationdb.server.types.LazyList;
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.common.types.StringAttribute;
import com.foundationdb.server.types.mcompat.mtypes.MString;
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.server.types.texpressions.TPreparedExpression;
import java.util.List;
public class MConcat extends TScalarBase {
public static final TScalar INSTANCE = new MConcat();
private MConcat(){}
@Override
protected void buildInputSets(TInputSetBuilder builder) {
builder.nextInputPicksWith(MString.VARCHAR.PICK_RIGHT_LENGTH).vararg(MString.VARCHAR, 0);
}
@Override
protected void doEvaluate(TExecutionContext context, LazyList<? extends ValueSource> inputs, ValueTarget output) {
StringBuilder sb = new StringBuilder();
for (int i = 0; i < inputs.size(); ++i) {
String inputStr = inputs.get(i).getString();
assert inputStr != null;
sb.append(inputStr);
}
output.putString(sb.toString(), null);
}
@Override
public String displayName() {
return "concatenate";
}
@Override
public String[] registeredNames() {
return new String[] { "concatenate", "concat" };
}
@Override
public TOverloadResult resultType() {
return TOverloadResult.custom(new TCustomOverloadResult() {
@Override
public TInstance resultInstance(List<TPreptimeValue> inputs, TPreptimeContext context) {
int length = 0;
for (TPreptimeValue ptv : inputs) {
length += ptv.type().attribute(StringAttribute.MAX_LENGTH);
}
return MString.VARCHAR.instance(length, anyContaminatingNulls(inputs));
}
});
}
@Override
public CompoundExplainer getExplainer(ExplainContext context, List<? extends TPreparedExpression> inputs, TInstance resultType)
{
CompoundExplainer ex = super.getExplainer(context, inputs, resultType);
ex.addAttribute(Label.INFIX_REPRESENTATION, PrimitiveExplainer.getInstance("||"));
ex.addAttribute(Label.ASSOCIATIVE, PrimitiveExplainer.getInstance(true));
return ex;
}
}