io.druid.query.lookup.LookupExtractionFn.java Source code

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Here is the source code for io.druid.query.lookup.LookupExtractionFn.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.query.lookup;

import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.google.common.base.Function;
import com.google.common.base.Strings;
import com.google.common.base.Throwables;
import io.druid.java.util.common.StringUtils;
import io.druid.query.extraction.ExtractionCacheHelper;
import io.druid.query.extraction.FunctionalExtraction;

import javax.annotation.Nullable;
import java.io.ByteArrayOutputStream;
import java.io.IOException;

public class LookupExtractionFn extends FunctionalExtraction {
    private final LookupExtractor lookup;
    private final boolean optimize;
    // Thes are retained for auto generated hashCode and Equals
    private final boolean retainMissingValue;
    private final String replaceMissingValueWith;
    private final boolean injective;

    @JsonCreator
    public LookupExtractionFn(@JsonProperty("lookup") final LookupExtractor lookup,
            @JsonProperty("retainMissingValue") final boolean retainMissingValue,
            @Nullable @JsonProperty("replaceMissingValueWith") final String replaceMissingValueWith,
            @JsonProperty("injective") final boolean injective, @JsonProperty("optimize") Boolean optimize) {
        super(new Function<String, String>() {
            @Nullable
            @Override
            public String apply(String input) {
                return lookup.apply(Strings.nullToEmpty(input));
            }
        }, retainMissingValue, replaceMissingValueWith, injective);
        this.lookup = lookup;
        this.optimize = optimize == null ? true : optimize;
        this.retainMissingValue = retainMissingValue;
        this.injective = injective;
        this.replaceMissingValueWith = replaceMissingValueWith;
    }

    @JsonProperty
    public LookupExtractor getLookup() {
        return lookup;
    }

    @Override
    @JsonProperty
    public boolean isRetainMissingValue() {
        return super.isRetainMissingValue();
    }

    @Override
    @JsonProperty
    public String getReplaceMissingValueWith() {
        return super.getReplaceMissingValueWith();
    }

    @Override
    @JsonProperty
    public boolean isInjective() {
        return super.isInjective();
    }

    @JsonProperty("optimize")
    public boolean isOptimize() {
        return optimize;
    }

    @Override
    public byte[] getCacheKey() {
        try {
            final ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
            outputStream.write(ExtractionCacheHelper.CACHE_TYPE_ID_LOOKUP);
            outputStream.write(lookup.getCacheKey());
            if (getReplaceMissingValueWith() != null) {
                outputStream.write(StringUtils.toUtf8(getReplaceMissingValueWith()));
                outputStream.write(0xFF);
            }
            outputStream.write(isInjective() ? 1 : 0);
            outputStream.write(isRetainMissingValue() ? 1 : 0);
            outputStream.write(isOptimize() ? 1 : 0);
            return outputStream.toByteArray();
        } catch (IOException ex) {
            // If ByteArrayOutputStream.write has problems, that is a very bad thing
            throw Throwables.propagate(ex);
        }
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }

        LookupExtractionFn that = (LookupExtractionFn) o;

        if (isOptimize() != that.isOptimize()) {
            return false;
        }
        if (isRetainMissingValue() != that.isRetainMissingValue()) {
            return false;
        }
        if (isInjective() != that.isInjective()) {
            return false;
        }
        if (getLookup() != null ? !getLookup().equals(that.getLookup()) : that.getLookup() != null) {
            return false;
        }
        return getReplaceMissingValueWith() != null
                ? getReplaceMissingValueWith().equals(that.getReplaceMissingValueWith())
                : that.getReplaceMissingValueWith() == null;

    }

    @Override
    public int hashCode() {
        int result = getLookup() != null ? getLookup().hashCode() : 0;
        result = 31 * result + (isOptimize() ? 1 : 0);
        result = 31 * result + (isRetainMissingValue() ? 1 : 0);
        result = 31 * result + (getReplaceMissingValueWith() != null ? getReplaceMissingValueWith().hashCode() : 0);
        result = 31 * result + (isInjective() ? 1 : 0);
        return result;
    }
}