/*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.facebook.presto.sql.planner.assertions;
import com.facebook.presto.Session;
import com.facebook.presto.metadata.Metadata;
import com.facebook.presto.sql.planner.Symbol;
import com.facebook.presto.sql.planner.plan.PlanNode;
import com.facebook.presto.sql.tree.Expression;
import com.google.common.collect.ImmutableList;
import java.util.List;
import static com.facebook.presto.sql.planner.assertions.MatchResult.NO_MATCH;
import static com.facebook.presto.sql.planner.assertions.MatchResult.match;
import static com.google.common.base.MoreObjects.toStringHelper;
import static java.util.Objects.requireNonNull;
public class OutputMatcher
implements Matcher
{
private final List<String> aliases;
OutputMatcher(List<String> aliases)
{
this.aliases = ImmutableList.copyOf(requireNonNull(aliases, "aliases is null"));
}
@Override
public boolean shapeMatches(PlanNode node)
{
return true;
}
@Override
public MatchResult detailMatches(PlanNode node, Session session, Metadata metadata, SymbolAliases symbolAliases)
{
int i = 0;
for (String alias : aliases) {
Expression expression = symbolAliases.get(alias);
boolean found = false;
while (i < node.getOutputSymbols().size()) {
Symbol outputSymbol = node.getOutputSymbols().get(i++);
if (expression.equals(outputSymbol.toSymbolReference())) {
found = true;
break;
}
}
if (!found) {
return NO_MATCH;
}
}
return match();
}
@Override
public String toString()
{
return toStringHelper(this)
.add("outputs", aliases)
.toString();
}
}