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Script: keyword fields api support (#81266)
* Script: keyword fields api support Adds basic support for keyword fields in the scripting fields api. Refs: #79105
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| pr: 81266 | ||
| summary: "Script: keyword fields api support" | ||
| area: Infra/Scripting | ||
| type: enhancement | ||
| issues: [] |
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131 changes: 131 additions & 0 deletions
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server/src/main/java/org/elasticsearch/script/field/KeywordDocValuesField.java
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| /* | ||
| * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one | ||
| * or more contributor license agreements. Licensed under the Elastic License | ||
| * 2.0 and the Server Side Public License, v 1; you may not use this file except | ||
| * in compliance with, at your election, the Elastic License 2.0 or the Server | ||
| * Side Public License, v 1. | ||
| */ | ||
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| package org.elasticsearch.script.field; | ||
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| import org.apache.lucene.util.ArrayUtil; | ||
| import org.apache.lucene.util.BytesRef; | ||
| import org.apache.lucene.util.BytesRefBuilder; | ||
| import org.elasticsearch.index.fielddata.ScriptDocValues; | ||
| import org.elasticsearch.index.fielddata.SortedBinaryDocValues; | ||
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| import java.io.IOException; | ||
| import java.util.Iterator; | ||
| import java.util.NoSuchElementException; | ||
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| public class KeywordDocValuesField implements DocValuesField<String>, ScriptDocValues.Supplier<String> { | ||
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| private final SortedBinaryDocValues input; | ||
| private final String name; | ||
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| private BytesRefBuilder[] values = new BytesRefBuilder[0]; | ||
| private int count; | ||
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| // used for backwards compatibility for old-style "doc" access | ||
| // as a delegate to this field class | ||
| private ScriptDocValues.Strings strings = null; | ||
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| public KeywordDocValuesField(SortedBinaryDocValues input, String name) { | ||
| this.input = input; | ||
| this.name = name; | ||
| } | ||
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| @Override | ||
| public void setNextDocId(int docId) throws IOException { | ||
| if (input.advanceExact(docId)) { | ||
| resize(input.docValueCount()); | ||
| for (int i = 0; i < count; i++) { | ||
| // We need to make a copy here, because BytesBinaryDVLeafFieldData's SortedBinaryDocValues | ||
| // implementation reuses the returned BytesRef. Otherwise we would end up with the same BytesRef | ||
| // instance for all slots in the values array. | ||
| values[i].copyBytes(input.nextValue()); | ||
| } | ||
| } else { | ||
| resize(0); | ||
| } | ||
| } | ||
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| private void resize(int newSize) { | ||
| count = newSize; | ||
| assert count >= 0 : "size must be positive (got " + count + "): likely integer overflow?"; | ||
| if (newSize > values.length) { | ||
| final int oldLength = values.length; | ||
| values = ArrayUtil.grow(values, count); | ||
| for (int i = oldLength; i < values.length; ++i) { | ||
| values[i] = new BytesRefBuilder(); | ||
| } | ||
| } | ||
| } | ||
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| @Override | ||
| public ScriptDocValues<String> getScriptDocValues() { | ||
| if (strings == null) { | ||
| strings = new ScriptDocValues.Strings(this); | ||
| } | ||
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| return strings; | ||
| } | ||
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| // this method is required to support the Boolean return values | ||
| // for the old-style "doc" access in ScriptDocValues | ||
| @Override | ||
| public String getInternal(int index) { | ||
| return bytesToString(values[index].toBytesRef()); | ||
| } | ||
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| protected String bytesToString(BytesRef bytesRef) { | ||
| return bytesRef.utf8ToString(); | ||
| } | ||
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| @Override | ||
| public String getName() { | ||
| return name; | ||
| } | ||
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| @Override | ||
| public boolean isEmpty() { | ||
| return count == 0; | ||
| } | ||
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| @Override | ||
| public int size() { | ||
| return count; | ||
| } | ||
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| public String get(String defaultValue) { | ||
| return get(0, defaultValue); | ||
| } | ||
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| public String get(int index, String defaultValue) { | ||
| if (isEmpty() || index < 0 || index >= count) { | ||
| return defaultValue; | ||
| } | ||
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| return bytesToString(values[index].toBytesRef()); | ||
| } | ||
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| @Override | ||
| public Iterator<String> iterator() { | ||
| return new Iterator<String>() { | ||
| private int index = 0; | ||
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| @Override | ||
| public boolean hasNext() { | ||
| return index < count; | ||
| } | ||
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| @Override | ||
| public String next() { | ||
| if (hasNext() == false) { | ||
| throw new NoSuchElementException(); | ||
| } | ||
| return bytesToString(values[index++].toBytesRef()); | ||
| } | ||
| }; | ||
| } | ||
| } |