| /* |
| * 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.apache.lucene.search; |
| |
| import java.io.IOException; |
| import java.util.Objects; |
| |
| import org.apache.lucene.index.DocValues; |
| import org.apache.lucene.index.LeafReaderContext; |
| import org.apache.lucene.index.NumericDocValues; |
| import org.apache.lucene.index.PointValues; |
| import org.apache.lucene.search.comparators.LongComparator; |
| |
| /** |
| * Base class for producing {@link LongValues} |
| * |
| * To obtain a {@link LongValues} object for a leaf reader, clients should |
| * call {@link #rewrite(IndexSearcher)} against the top-level searcher, and |
| * then {@link #getValues(LeafReaderContext, DoubleValues)}. |
| * |
| * LongValuesSource objects for long and int-valued NumericDocValues fields can |
| * be obtained by calling {@link #fromLongField(String)} and {@link #fromIntField(String)}. |
| * |
| * To obtain a LongValuesSource from a float or double-valued NumericDocValues field, |
| * use {@link DoubleValuesSource#fromFloatField(String)} or {@link DoubleValuesSource#fromDoubleField(String)} |
| * and then call {@link DoubleValuesSource#toLongValuesSource()}. |
| */ |
| public abstract class LongValuesSource implements SegmentCacheable { |
| |
| /** |
| * Returns a {@link LongValues} instance for the passed-in LeafReaderContext and scores |
| * |
| * If scores are not needed to calculate the values (ie {@link #needsScores() returns false}, callers |
| * may safely pass {@code null} for the {@code scores} parameter. |
| */ |
| public abstract LongValues getValues(LeafReaderContext ctx, DoubleValues scores) throws IOException; |
| |
| /** |
| * Return true if document scores are needed to calculate values |
| */ |
| public abstract boolean needsScores(); |
| |
| @Override |
| public abstract int hashCode(); |
| |
| @Override |
| public abstract boolean equals(Object obj); |
| |
| @Override |
| public abstract String toString(); |
| |
| /** |
| * Return a LongValuesSource specialised for the given IndexSearcher |
| * |
| * Implementations should assume that this will only be called once. |
| * IndexSearcher-independent implementations can just return {@code this} |
| */ |
| public abstract LongValuesSource rewrite(IndexSearcher searcher) throws IOException; |
| |
| /** |
| * Create a sort field based on the value of this producer |
| * @param reverse true if the sort should be decreasing |
| */ |
| public SortField getSortField(boolean reverse) { |
| return new LongValuesSortField(this, reverse); |
| } |
| |
| /** |
| * Convert to a DoubleValuesSource by casting long values to doubles |
| */ |
| public DoubleValuesSource toDoubleValuesSource() { |
| return new DoubleLongValuesSource(this); |
| } |
| |
| private static class DoubleLongValuesSource extends DoubleValuesSource { |
| |
| private final LongValuesSource inner; |
| |
| private DoubleLongValuesSource(LongValuesSource inner) { |
| this.inner = inner; |
| } |
| |
| @Override |
| public DoubleValues getValues(LeafReaderContext ctx, DoubleValues scores) throws IOException { |
| LongValues v = inner.getValues(ctx, scores); |
| return new DoubleValues() { |
| @Override |
| public double doubleValue() throws IOException { |
| return (double) v.longValue(); |
| } |
| |
| @Override |
| public boolean advanceExact(int doc) throws IOException { |
| return v.advanceExact(doc); |
| } |
| }; |
| } |
| |
| @Override |
| public DoubleValuesSource rewrite(IndexSearcher searcher) throws IOException { |
| return inner.rewrite(searcher).toDoubleValuesSource(); |
| } |
| |
| @Override |
| public boolean isCacheable(LeafReaderContext ctx) { |
| return inner.isCacheable(ctx); |
| } |
| |
| @Override |
| public String toString() { |
| return "double(" + inner.toString() + ")"; |
| } |
| |
| @Override |
| public boolean needsScores() { |
| return inner.needsScores(); |
| } |
| |
| @Override |
| public boolean equals(Object o) { |
| if (this == o) return true; |
| if (o == null || getClass() != o.getClass()) return false; |
| DoubleLongValuesSource that = (DoubleLongValuesSource) o; |
| return Objects.equals(inner, that.inner); |
| } |
| |
| @Override |
| public int hashCode() { |
| return Objects.hash(inner); |
| } |
| } |
| |
| /** |
| * Creates a LongValuesSource that wraps a long-valued field |
| */ |
| public static LongValuesSource fromLongField(String field) { |
| return new FieldValuesSource(field); |
| } |
| |
| /** |
| * Creates a LongValuesSource that wraps an int-valued field |
| */ |
| public static LongValuesSource fromIntField(String field) { |
| return fromLongField(field); |
| } |
| |
| /** |
| * Creates a LongValuesSource that always returns a constant value |
| */ |
| public static LongValuesSource constant(long value) { |
| return new ConstantLongValuesSource(value); |
| } |
| |
| private static class ConstantLongValuesSource extends LongValuesSource { |
| |
| private final long value; |
| |
| private ConstantLongValuesSource(long value) { |
| this.value = value; |
| } |
| |
| @Override |
| public LongValues getValues(LeafReaderContext ctx, DoubleValues scores) throws IOException { |
| return new LongValues() { |
| @Override |
| public long longValue() throws IOException { |
| return value; |
| } |
| |
| @Override |
| public boolean advanceExact(int doc) throws IOException { |
| return true; |
| } |
| }; |
| } |
| |
| @Override |
| public boolean isCacheable(LeafReaderContext ctx) { |
| return true; |
| } |
| |
| @Override |
| public boolean needsScores() { |
| return false; |
| } |
| |
| @Override |
| public int hashCode() { |
| return Objects.hash(value); |
| } |
| |
| @Override |
| public boolean equals(Object o) { |
| if (this == o) return true; |
| if (o == null || getClass() != o.getClass()) return false; |
| ConstantLongValuesSource that = (ConstantLongValuesSource) o; |
| return value == that.value; |
| } |
| |
| @Override |
| public String toString() { |
| return "constant(" + value + ")"; |
| } |
| |
| @Override |
| public LongValuesSource rewrite(IndexSearcher searcher) throws IOException { |
| return this; |
| } |
| |
| } |
| |
| private static class FieldValuesSource extends LongValuesSource { |
| |
| final String field; |
| |
| private FieldValuesSource(String field) { |
| this.field = field; |
| } |
| |
| @Override |
| public boolean equals(Object o) { |
| if (this == o) return true; |
| if (o == null || getClass() != o.getClass()) return false; |
| FieldValuesSource that = (FieldValuesSource) o; |
| return Objects.equals(field, that.field); |
| } |
| |
| @Override |
| public String toString() { |
| return "long(" + field + ")"; |
| } |
| |
| @Override |
| public int hashCode() { |
| return Objects.hash(field); |
| } |
| |
| @Override |
| public LongValues getValues(LeafReaderContext ctx, DoubleValues scores) throws IOException { |
| final NumericDocValues values = DocValues.getNumeric(ctx.reader(), field); |
| return toLongValues(values); |
| } |
| |
| @Override |
| public boolean isCacheable(LeafReaderContext ctx) { |
| return DocValues.isCacheable(ctx, field); |
| } |
| |
| @Override |
| public boolean needsScores() { |
| return false; |
| } |
| |
| @Override |
| public LongValuesSource rewrite(IndexSearcher searcher) throws IOException { |
| return this; |
| } |
| } |
| |
| private static class LongValuesSortField extends SortField { |
| |
| final LongValuesSource producer; |
| |
| public LongValuesSortField(LongValuesSource producer, boolean reverse) { |
| super(producer.toString(), new LongValuesComparatorSource(producer), reverse); |
| this.producer = producer; |
| } |
| |
| @Override |
| public void setMissingValue(Object missingValue) { |
| if (missingValue instanceof Number) { |
| this.missingValue = missingValue; |
| ((LongValuesComparatorSource) getComparatorSource()).setMissingValue(((Number) missingValue).longValue()); |
| } else { |
| super.setMissingValue(missingValue); |
| } |
| } |
| |
| @Override |
| public boolean needsScores() { |
| return producer.needsScores(); |
| } |
| |
| @Override |
| public String toString() { |
| StringBuilder buffer = new StringBuilder("<"); |
| buffer.append(getField()).append(">"); |
| if (reverse) |
| buffer.append("!"); |
| return buffer.toString(); |
| } |
| |
| @Override |
| public SortField rewrite(IndexSearcher searcher) throws IOException { |
| LongValuesSortField rewritten = new LongValuesSortField(producer.rewrite(searcher), reverse); |
| if (missingValue != null) { |
| rewritten.setMissingValue(missingValue); |
| } |
| return rewritten; |
| } |
| } |
| |
| private static class LongValuesHolder { |
| LongValues values; |
| } |
| |
| private static class LongValuesComparatorSource extends FieldComparatorSource { |
| private final LongValuesSource producer; |
| private long missingValue; |
| |
| public LongValuesComparatorSource(LongValuesSource producer) { |
| this.producer = producer; |
| this.missingValue = 0L; |
| } |
| |
| void setMissingValue(long missingValue) { |
| this.missingValue = missingValue; |
| } |
| |
| @Override |
| public FieldComparator<Long> newComparator(String fieldname, int numHits, |
| int sortPos, boolean reversed) { |
| return new LongComparator(numHits, fieldname, missingValue, reversed, sortPos) { |
| @Override |
| public LeafFieldComparator getLeafComparator(LeafReaderContext context) throws IOException { |
| LongValuesHolder holder = new LongValuesHolder(); |
| |
| return new LongComparator.LongLeafComparator(context) { |
| LeafReaderContext ctx; |
| |
| @Override |
| protected NumericDocValues getNumericDocValues(LeafReaderContext context, String field) { |
| ctx = context; |
| return asNumericDocValues(holder); |
| } |
| |
| @Override |
| protected PointValues getPointValues(LeafReaderContext context, String field) { |
| return null; |
| } |
| |
| @Override |
| public void setScorer(Scorable scorer) throws IOException { |
| holder.values = producer.getValues(ctx, DoubleValuesSource.fromScorer(scorer)); |
| super.setScorer(scorer); |
| } |
| }; |
| } |
| }; |
| } |
| } |
| |
| private static LongValues toLongValues(NumericDocValues in) { |
| return new LongValues() { |
| @Override |
| public long longValue() throws IOException { |
| return in.longValue(); |
| } |
| |
| @Override |
| public boolean advanceExact(int target) throws IOException { |
| return in.advanceExact(target); |
| } |
| |
| }; |
| } |
| |
| private static NumericDocValues asNumericDocValues(LongValuesHolder in) { |
| return new NumericDocValues() { |
| @Override |
| public long longValue() throws IOException { |
| return in.values.longValue(); |
| } |
| |
| @Override |
| public boolean advanceExact(int target) throws IOException { |
| return in.values.advanceExact(target); |
| } |
| |
| @Override |
| public int docID() { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public int nextDoc() throws IOException { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public int advance(int target) throws IOException { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public long cost() { |
| throw new UnsupportedOperationException(); |
| } |
| }; |
| } |
| |
| } |