org.eigenbase.relopt.RelOptPredicateList.java Source code

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Here is the source code for org.eigenbase.relopt.RelOptPredicateList.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to you 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 org.eigenbase.relopt;

import org.eigenbase.rex.RexNode;

import com.google.common.collect.ImmutableList;

/**
 * Predicates that are known to hold in the output of a particular relational
 * expression.
 */
public class RelOptPredicateList {
    private static final ImmutableList<RexNode> EMPTY_LIST = ImmutableList.of();
    public static final RelOptPredicateList EMPTY = new RelOptPredicateList(EMPTY_LIST, EMPTY_LIST, EMPTY_LIST);

    public final ImmutableList<RexNode> pulledUpPredicates;
    public final ImmutableList<RexNode> leftInferredPredicates;
    public final ImmutableList<RexNode> rightInferredPredicates;

    private RelOptPredicateList(Iterable<RexNode> pulledUpPredicates, Iterable<RexNode> leftInferredPredicates,
            Iterable<RexNode> rightInferredPredicates) {
        this.pulledUpPredicates = ImmutableList.copyOf(pulledUpPredicates);
        this.leftInferredPredicates = ImmutableList.copyOf(leftInferredPredicates);
        this.rightInferredPredicates = ImmutableList.copyOf(rightInferredPredicates);
    }

    public static RelOptPredicateList of(Iterable<RexNode> pulledUpPredicates) {
        ImmutableList<RexNode> pulledUpPredicatesList = ImmutableList.copyOf(pulledUpPredicates);
        if (pulledUpPredicatesList.isEmpty()) {
            return EMPTY;
        }
        return new RelOptPredicateList(pulledUpPredicatesList, EMPTY_LIST, EMPTY_LIST);
    }

    public static RelOptPredicateList of(Iterable<RexNode> pulledUpPredicates,
            Iterable<RexNode> leftInferredPredicates, Iterable<RexNode> rightInferredPredicates) {
        final ImmutableList<RexNode> pulledUpPredicatesList = ImmutableList.copyOf(pulledUpPredicates);
        final ImmutableList<RexNode> leftInferredPredicateList = ImmutableList.copyOf(leftInferredPredicates);
        final ImmutableList<RexNode> rightInferredPredicatesList = ImmutableList.copyOf(rightInferredPredicates);
        if (pulledUpPredicatesList.isEmpty() && leftInferredPredicateList.isEmpty()
                && rightInferredPredicatesList.isEmpty()) {
            return EMPTY;
        }
        return new RelOptPredicateList(pulledUpPredicatesList, leftInferredPredicateList,
                rightInferredPredicatesList);
    }
}

// End RelOptPulledUpPredicates.java