com.facebook.presto.sql.planner.assertions.SpecificationProvider.java Source code

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Here is the source code for com.facebook.presto.sql.planner.assertions.SpecificationProvider.java

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/*
 * 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.spi.block.SortOrder;
import com.facebook.presto.sql.planner.plan.WindowNode;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;

import java.util.List;
import java.util.Map;

import static com.google.common.base.MoreObjects.toStringHelper;
import static com.google.common.collect.ImmutableList.toImmutableList;
import static com.google.common.collect.ImmutableMap.toImmutableMap;
import static java.util.Objects.requireNonNull;

public class SpecificationProvider implements ExpectedValueProvider<WindowNode.Specification> {
    private final List<SymbolAlias> partitionBy;
    private final List<SymbolAlias> orderBy;
    private final Map<SymbolAlias, SortOrder> orderings;

    SpecificationProvider(List<SymbolAlias> partitionBy, List<SymbolAlias> orderBy,
            Map<SymbolAlias, SortOrder> orderings) {
        this.partitionBy = ImmutableList.copyOf(requireNonNull(partitionBy, "partitionBy is null"));
        this.orderBy = ImmutableList.copyOf(requireNonNull(orderBy, "orderBy is null"));
        this.orderings = ImmutableMap.copyOf(requireNonNull(orderings, "orderings is null"));
    }

    @Override
    public WindowNode.Specification getExpectedValue(SymbolAliases aliases) {
        return new WindowNode.Specification(
                partitionBy.stream().map(alias -> alias.toSymbol(aliases)).collect(toImmutableList()),
                orderBy.stream().map(alias -> alias.toSymbol(aliases)).collect(toImmutableList()),
                orderings.entrySet().stream()
                        .collect(toImmutableMap(entry -> entry.getKey().toSymbol(aliases), Map.Entry::getValue)));
    }

    @Override
    public String toString() {
        return toStringHelper(this).add("partitionBy", this.partitionBy).add("orderBy", this.orderBy)
                .add("orderings", this.orderings).toString();
    }
}