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/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.elasticsearch.index.fielddata;
import org.apache.lucene.index.AtomicReaderContext;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.search.*;
import org.apache.lucene.util.BytesRef;
import org.apache.lucene.util.BytesRefBuilder;
import org.apache.lucene.util.FixedBitSet;
import org.elasticsearch.common.Nullable;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.index.Index;
import org.elasticsearch.index.IndexComponent;
import org.elasticsearch.index.cache.fixedbitset.FixedBitSetFilter;
import org.elasticsearch.index.fielddata.IndexFieldData.XFieldComparatorSource.Nested;
import org.elasticsearch.index.mapper.FieldMapper;
import org.elasticsearch.index.mapper.MapperService;
import org.elasticsearch.index.settings.IndexSettings;
import org.elasticsearch.indices.breaker.CircuitBreakerService;
import org.elasticsearch.search.MultiValueMode;
import java.io.IOException;
/**
* Thread-safe utility class that allows to get per-segment values via the
* {@link #load(AtomicReaderContext)} method.
*/
public interface IndexFieldData extends IndexComponent {
public static class CommonSettings {
public static final String SETTING_MEMORY_STORAGE_HINT = "memory_storage_hint";
public enum MemoryStorageFormat {
ORDINALS, PACKED, PAGED;
public static MemoryStorageFormat fromString(String string) {
for (MemoryStorageFormat e : MemoryStorageFormat.values()) {
if (e.name().equalsIgnoreCase(string)) {
return e;
}
}
return null;
}
}
/**
* Gets a memory storage hint that should be honored if possible but is not mandatory
*/
public static MemoryStorageFormat getMemoryStorageHint(FieldDataType fieldDataType) {
// backwards compatibility
String s = fieldDataType.getSettings().get("ordinals");
if (s != null) {
return "always".equals(s) ? MemoryStorageFormat.ORDINALS : null;
}
return MemoryStorageFormat.fromString(fieldDataType.getSettings().get(SETTING_MEMORY_STORAGE_HINT));
}
}
/**
* The field name.
*/
FieldMapper.Names getFieldNames();
/**
* The field data type.
*/
FieldDataType getFieldDataType();
/**
* Loads the atomic field data for the reader, possibly cached.
*/
FD load(AtomicReaderContext context);
/**
* Loads directly the atomic field data for the reader, ignoring any caching involved.
*/
FD loadDirect(AtomicReaderContext context) throws Exception;
/**
* Comparator used for sorting.
*/
XFieldComparatorSource comparatorSource(@Nullable Object missingValue, MultiValueMode sortMode, Nested nested);
/**
* Clears any resources associated with this field data.
*/
void clear();
void clear(IndexReader reader);
// we need this extended source we we have custom comparators to reuse our field data
// in this case, we need to reduce type that will be used when search results are reduced
// on another node (we don't have the custom source them...)
public abstract class XFieldComparatorSource extends FieldComparatorSource {
/** UTF-8 term containing a single code point: {@link Character#MAX_CODE_POINT} which will compare greater than all other index terms
* since {@link Character#MAX_CODE_POINT} is a noncharacter and thus shouldn't appear in an index term. */
public static final BytesRef MAX_TERM;
static {
BytesRefBuilder builder = new BytesRefBuilder();
final char[] chars = Character.toChars(Character.MAX_CODE_POINT);
builder.copyChars(chars, 0, chars.length);
MAX_TERM = builder.toBytesRef();
}
/**
* Simple wrapper class around a filter that matches parent documents
* and a filter that matches child documents. For every root document R,
* R will be in the parent filter and its children documents will be the
* documents that are contained in the inner set between the previous
* parent + 1, or 0 if there is no previous parent, and R (excluded).
*/
public static class Nested {
private final FixedBitSetFilter rootFilter, innerFilter;
public Nested(FixedBitSetFilter rootFilter, FixedBitSetFilter innerFilter) {
this.rootFilter = rootFilter;
this.innerFilter = innerFilter;
}
/**
* Get a {@link FixedBitSet} that matches the root documents.
*/
public FixedBitSet rootDocs(AtomicReaderContext ctx) throws IOException {
return rootFilter.getDocIdSet(ctx, null);
}
/**
* Get a {@link FixedBitSet} that matches the inner documents.
*/
public FixedBitSet innerDocs(AtomicReaderContext ctx) throws IOException {
return innerFilter.getDocIdSet(ctx, null);
}
}
/** Whether missing values should be sorted first. */
protected final boolean sortMissingFirst(Object missingValue) {
return "_first".equals(missingValue);
}
/** Whether missing values should be sorted last, this is the default. */
protected final boolean sortMissingLast(Object missingValue) {
return missingValue == null || "_last".equals(missingValue);
}
/** Return the missing object value according to the reduced type of the comparator. */
protected final Object missingObject(Object missingValue, boolean reversed) {
if (sortMissingFirst(missingValue) || sortMissingLast(missingValue)) {
final boolean min = sortMissingFirst(missingValue) ^ reversed;
switch (reducedType()) {
case INT:
return min ? Integer.MIN_VALUE : Integer.MAX_VALUE;
case LONG:
return min ? Long.MIN_VALUE : Long.MAX_VALUE;
case FLOAT:
return min ? Float.NEGATIVE_INFINITY : Float.POSITIVE_INFINITY;
case DOUBLE:
return min ? Double.NEGATIVE_INFINITY : Double.POSITIVE_INFINITY;
case STRING:
case STRING_VAL:
return min ? null : MAX_TERM;
default:
throw new UnsupportedOperationException("Unsupported reduced type: " + reducedType());
}
} else {
switch (reducedType()) {
case INT:
if (missingValue instanceof Number) {
return ((Number) missingValue).intValue();
} else {
return Integer.parseInt(missingValue.toString());
}
case LONG:
if (missingValue instanceof Number) {
return ((Number) missingValue).longValue();
} else {
return Long.parseLong(missingValue.toString());
}
case FLOAT:
if (missingValue instanceof Number) {
return ((Number) missingValue).floatValue();
} else {
return Float.parseFloat(missingValue.toString());
}
case DOUBLE:
if (missingValue instanceof Number) {
return ((Number) missingValue).doubleValue();
} else {
return Double.parseDouble(missingValue.toString());
}
case STRING:
case STRING_VAL:
if (missingValue instanceof BytesRef) {
return (BytesRef) missingValue;
} else if (missingValue instanceof byte[]) {
return new BytesRef((byte[]) missingValue);
} else {
return new BytesRef(missingValue.toString());
}
default:
throw new UnsupportedOperationException("Unsupported reduced type: " + reducedType());
}
}
}
public abstract SortField.Type reducedType();
}
interface Builder {
IndexFieldData build(Index index, @IndexSettings Settings indexSettings, FieldMapper mapper, IndexFieldDataCache cache,
CircuitBreakerService breakerService, MapperService mapperService);
}
public static interface Global extends IndexFieldData {
IndexFieldData loadGlobal(IndexReader indexReader);
IndexFieldData localGlobalDirect(IndexReader indexReader) throws Exception;
}
}