io.druid.segment.filter.InFilter.java Source code

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Here is the source code for io.druid.segment.filter.InFilter.java

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/*
 * Licensed to Metamarkets Group Inc. (Metamarkets) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. Metamarkets 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 io.druid.segment.filter;

import com.google.common.base.Function;
import com.google.common.base.Predicate;
import com.google.common.base.Strings;
import com.google.common.base.Supplier;
import com.google.common.collect.Iterables;
import io.druid.collections.bitmap.ImmutableBitmap;
import io.druid.query.extraction.ExtractionFn;
import io.druid.query.filter.BitmapIndexSelector;
import io.druid.query.filter.DruidLongPredicate;
import io.druid.query.filter.DruidPredicateFactory;
import io.druid.query.filter.Filter;
import io.druid.query.filter.ValueMatcher;
import io.druid.query.filter.ValueMatcherFactory;

import java.util.Set;

/**
 */
public class InFilter implements Filter {
    private final String dimension;
    private final Set<String> values;
    private final ExtractionFn extractionFn;
    private final Supplier<DruidLongPredicate> longPredicateSupplier;

    public InFilter(String dimension, Set<String> values, Supplier<DruidLongPredicate> longPredicateSupplier,
            ExtractionFn extractionFn) {
        this.dimension = dimension;
        this.values = values;
        this.extractionFn = extractionFn;
        this.longPredicateSupplier = longPredicateSupplier;
    }

    @Override
    public ImmutableBitmap getBitmapIndex(final BitmapIndexSelector selector) {
        if (extractionFn == null) {
            return selector.getBitmapFactory()
                    .union(Iterables.transform(values, new Function<String, ImmutableBitmap>() {
                        @Override
                        public ImmutableBitmap apply(String value) {
                            return selector.getBitmapIndex(dimension, value);
                        }
                    }));
        } else {
            return Filters.matchPredicate(dimension, selector, getPredicateFactory().makeStringPredicate());
        }
    }

    @Override
    public ValueMatcher makeMatcher(ValueMatcherFactory factory) {
        return factory.makeValueMatcher(dimension, getPredicateFactory());
    }

    @Override
    public boolean supportsBitmapIndex(BitmapIndexSelector selector) {
        return selector.getBitmapIndex(dimension) != null;
    }

    private DruidPredicateFactory getPredicateFactory() {
        return new DruidPredicateFactory() {
            @Override
            public Predicate<String> makeStringPredicate() {
                if (extractionFn != null) {
                    return new Predicate<String>() {
                        @Override
                        public boolean apply(String input) {
                            return values.contains(Strings.nullToEmpty(extractionFn.apply(input)));
                        }
                    };
                } else {
                    return new Predicate<String>() {
                        @Override
                        public boolean apply(String input) {
                            return values.contains(Strings.nullToEmpty(input));
                        }
                    };
                }
            }

            @Override
            public DruidLongPredicate makeLongPredicate() {
                if (extractionFn != null) {
                    return new DruidLongPredicate() {
                        @Override
                        public boolean applyLong(long input) {
                            return values.contains(extractionFn.apply(input));
                        }
                    };
                } else {
                    return longPredicateSupplier.get();
                }
            }
        };
    }
}