/**
* 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.ais.model.AkibanInformationSchema;
import com.foundationdb.ais.model.Column;
import com.foundationdb.ais.model.ColumnName;
import com.foundationdb.ais.model.Columnar;
import com.foundationdb.server.error.NoSuchColumnException;
import com.foundationdb.server.error.NoSuchTableException;
import com.foundationdb.server.types.LazyList;
import com.foundationdb.server.types.TClass;
import com.foundationdb.server.types.TExecutionContext;
import com.foundationdb.server.types.TOverloadResult;
import com.foundationdb.server.types.TScalar;
import com.foundationdb.server.types.texpressions.TInputSetBuilder;
import com.foundationdb.server.types.texpressions.TScalarBase;
import com.foundationdb.server.types.value.ValueSource;
import com.foundationdb.server.types.value.ValueTarget;
public class ColumnTypeString extends TScalarBase
{
public static TScalar[] create(TClass varchar) {
return new TScalar[] {
new ColumnTypeString(varchar, varchar, 0), // ('schema.table.column')
new ColumnTypeString(varchar, varchar, 0, 1), // ('table', 'column')
new ColumnTypeString(varchar, varchar, 0, 1, 2), // ('schema', 'table', 'column')
};
}
protected final TClass inputType;
protected final TClass outputType;
protected final int[] covering;
private ColumnTypeString(TClass inputType, TClass outputType, int... covering) {
this.inputType = inputType;
this.outputType = outputType;
this.covering = covering;
}
@Override
public String displayName() {
return "COLUMN_TYPE_STRING";
}
@Override
public TOverloadResult resultType() {
return TOverloadResult.fixed(outputType);
}
@Override
protected void buildInputSets(TInputSetBuilder builder) {
builder.covers(inputType, covering);
}
@Override
protected boolean nullContaminates(int inputIndex) {
return true;
}
@Override
protected boolean neverConstant() {
return false;
}
@Override
protected void doEvaluate(TExecutionContext context,
LazyList<? extends ValueSource> inputs,
ValueTarget output) {
String[] parts = { "", "", "" };
if(covering.length == 1) {
ColumnName columnName = ColumnName.parse("", inputs.get(0).getString());
parts[0] = columnName.getTableName().getSchemaName();
parts[1] = columnName.getTableName().getTableName();
parts[2] = columnName.getName();
} else {
for(int i = covering.length - 1, j = 2; i >= 0; --i, --j) {
parts[j] = inputs.get(i).getString();
}
}
if(parts[0].isEmpty()) {
parts[0] = context.getCurrentSchema();
}
AkibanInformationSchema ais = context.getQueryContext().getStore().schema().ais();
Columnar columnar = ais.getTable(parts[0], parts[1]);
if(columnar == null) {
columnar = ais.getView(parts[0], parts[1]);
if(columnar == null) {
throw new NoSuchTableException(parts[0], parts[1]);
}
}
Column column = columnar.getColumn(parts[2]);
if(column == null) {
throw new NoSuchColumnException(String.format("%s.%s.%s", parts[0], parts[1], parts[2]));
}
output.putString(column.getType().toStringConcise(false), null);
}
}