/**
* 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.qp.expression;
import com.foundationdb.qp.operator.API;
import com.foundationdb.qp.operator.ExpressionGenerator;
import com.foundationdb.qp.operator.QueryBindings;
import com.foundationdb.qp.operator.QueryContext;
import com.foundationdb.qp.rowtype.RowType;
import com.foundationdb.server.explain.Attributes;
import com.foundationdb.server.explain.CompoundExplainer;
import com.foundationdb.server.explain.ExplainContext;
import com.foundationdb.server.explain.Label;
import com.foundationdb.server.explain.Type;
import com.foundationdb.server.types.value.ValueRecord;
import com.foundationdb.server.types.value.ValueSource;
import com.foundationdb.server.types.texpressions.TPreparedExpression;
import java.util.List;
public final class RowBasedUnboundExpressions implements UnboundExpressions {
@Override
public ValueRecord get(QueryContext context, QueryBindings bindings) {
return new ExpressionsAndBindings(rowType, pExprs, context, bindings);
}
@Override
public CompoundExplainer getExplainer(ExplainContext context) {
Attributes atts = new Attributes();
for (TPreparedExpression expression : pExprs) {
atts.put(Label.EXPRESSIONS, expression.getExplainer(context));
}
return new CompoundExplainer(Type.ROW, atts);
}
@Override
public String toString() {
return "UnboundExpressions" + pExprs;
}
// The extra, unused boolean parameter is to allow java to cleanly
// distinguish between this method and the next one.
public RowBasedUnboundExpressions(RowType rowType, List<ExpressionGenerator> expressions, boolean generate) {
this(rowType, API.generateNew(expressions));
}
public RowBasedUnboundExpressions(RowType rowType, List<TPreparedExpression> pExprs)
{
assert pExprs != null : "must supply pExprs";
for (TPreparedExpression expression : pExprs) {
if (expression == null) {
throw new IllegalArgumentException();
}
}
this.pExprs = pExprs;
this.rowType = rowType.schema().newProjectType(pExprs);
}
private final List<TPreparedExpression> pExprs;
private final RowType rowType;
private static class ExpressionsAndBindings implements ValueRecord {
@Override
public ValueSource value(int index) {
return expressionRow.value(index);
}
ExpressionsAndBindings(RowType rowType, List<TPreparedExpression> pExprs,
QueryContext context, QueryBindings bindings)
{
expressionRow = new ExpressionRow(rowType, context, bindings, pExprs);
}
private final ExpressionRow expressionRow;
}
}