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Add SearchExtBuilders to SearchResponse (opensearch-project#9379)
* Add SearchExtBuilders to SearchResponse. [Issue opensearch-project#9328](opensearch-project#9328) Signed-off-by: Austin Lee <[email protected]> * Keep SearchResponse immutable, add a constructor to take a List of SearchExtBuilders. Signed-off-by: Austin Lee <[email protected]> * Fix spotlessJavaCheck findings. Signed-off-by: Austin Lee <[email protected]> * Move SearchExtBuilders into SearchResponseSections, fix indenting in SearchRequest. Signed-off-by: Austin Lee <[email protected]> * Updated changelog (mixed minor formatting issues), added version checks on serialization/deserialization, added a Builder for making copies of SearchResponse easier. Signed-off-by: Austin Lee <[email protected]> * Add GenericSearchExtBuilder as a catch-all for SearchExtBuilders not registered in xcontent registry. Signed-off-by: Austin Lee <[email protected]> * Simplify GenericSearchExtBuilder using a single Object member. Signed-off-by: Austin Lee <[email protected]> * Address additional review comments. Signed-off-by: Austin Lee <[email protected]> * Add Javadocs. Signed-off-by: Austin Lee <[email protected]> --------- Signed-off-by: Austin Lee <[email protected]> Signed-off-by: Ivan Brusic <[email protected]>
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165
server/src/main/java/org/opensearch/search/GenericSearchExtBuilder.java
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| /* | ||
| * SPDX-License-Identifier: Apache-2.0 | ||
| * | ||
| * The OpenSearch Contributors require contributions made to | ||
| * this file be licensed under the Apache-2.0 license or a | ||
| * compatible open source license. | ||
| */ | ||
| package org.opensearch.search; | ||
|
|
||
| import org.opensearch.core.ParseField; | ||
| import org.opensearch.core.common.io.stream.StreamInput; | ||
| import org.opensearch.core.common.io.stream.StreamOutput; | ||
| import org.opensearch.core.xcontent.XContentBuilder; | ||
| import org.opensearch.core.xcontent.XContentParseException; | ||
| import org.opensearch.core.xcontent.XContentParser; | ||
|
|
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| import java.io.IOException; | ||
| import java.util.List; | ||
| import java.util.Map; | ||
| import java.util.Objects; | ||
|
|
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| /** | ||
| * This is a catch-all SearchExtBuilder implementation that is used when an appropriate SearchExtBuilder | ||
| * is not found during SearchResponse's fromXContent operation. | ||
| */ | ||
| public final class GenericSearchExtBuilder extends SearchExtBuilder { | ||
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| public final static ParseField EXT_BUILDER_NAME = new ParseField("generic_ext"); | ||
|
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| private final Object genericObj; | ||
| private final ValueType valueType; | ||
|
|
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| enum ValueType { | ||
| SIMPLE(0), | ||
| MAP(1), | ||
| LIST(2); | ||
|
|
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| private final int value; | ||
|
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| ValueType(int value) { | ||
| this.value = value; | ||
| } | ||
|
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| public int getValue() { | ||
| return value; | ||
| } | ||
|
|
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| static ValueType fromInt(int value) { | ||
| switch (value) { | ||
| case 0: | ||
| return SIMPLE; | ||
| case 1: | ||
| return MAP; | ||
| case 2: | ||
| return LIST; | ||
| default: | ||
| throw new IllegalArgumentException("Unsupported value: " + value); | ||
| } | ||
| } | ||
| } | ||
|
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| public GenericSearchExtBuilder(Object genericObj, ValueType valueType) { | ||
| this.genericObj = genericObj; | ||
| this.valueType = valueType; | ||
| } | ||
|
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| public GenericSearchExtBuilder(StreamInput in) throws IOException { | ||
| valueType = ValueType.fromInt(in.readInt()); | ||
| switch (valueType) { | ||
| case SIMPLE: | ||
| genericObj = in.readGenericValue(); | ||
| break; | ||
| case MAP: | ||
| genericObj = in.readMap(); | ||
| break; | ||
| case LIST: | ||
| genericObj = in.readList(r -> r.readGenericValue()); | ||
| break; | ||
| default: | ||
| throw new IllegalStateException("Unable to construct GenericSearchExtBuilder from incoming stream."); | ||
| } | ||
| } | ||
|
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| public static GenericSearchExtBuilder fromXContent(XContentParser parser) throws IOException { | ||
| // Look at the parser's next token. | ||
| // If it's START_OBJECT, parse as map, if it's START_ARRAY, parse as list, else | ||
| // parse as simpleVal | ||
| XContentParser.Token token = parser.currentToken(); | ||
| ValueType valueType; | ||
| Object genericObj; | ||
| if (token == XContentParser.Token.START_OBJECT) { | ||
| genericObj = parser.map(); | ||
| valueType = ValueType.MAP; | ||
| } else if (token == XContentParser.Token.START_ARRAY) { | ||
| genericObj = parser.list(); | ||
| valueType = ValueType.LIST; | ||
| } else if (token.isValue()) { | ||
| genericObj = parser.objectText(); | ||
| valueType = ValueType.SIMPLE; | ||
| } else { | ||
| throw new XContentParseException("Unknown token: " + token); | ||
| } | ||
|
|
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| return new GenericSearchExtBuilder(genericObj, valueType); | ||
| } | ||
|
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| @Override | ||
| public String getWriteableName() { | ||
| return EXT_BUILDER_NAME.getPreferredName(); | ||
| } | ||
|
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| @Override | ||
| public void writeTo(StreamOutput out) throws IOException { | ||
| out.writeInt(valueType.getValue()); | ||
| switch (valueType) { | ||
| case SIMPLE: | ||
| out.writeGenericValue(genericObj); | ||
| break; | ||
| case MAP: | ||
| out.writeMap((Map<String, Object>) genericObj); | ||
| break; | ||
| case LIST: | ||
| out.writeCollection((List<Object>) genericObj, StreamOutput::writeGenericValue); | ||
| break; | ||
| default: | ||
| throw new IllegalStateException("Unknown valueType: " + valueType); | ||
| } | ||
| } | ||
|
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| @Override | ||
| public XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException { | ||
| switch (valueType) { | ||
| case SIMPLE: | ||
| return builder.field(EXT_BUILDER_NAME.getPreferredName(), genericObj); | ||
| case MAP: | ||
| return builder.field(EXT_BUILDER_NAME.getPreferredName(), (Map<String, Object>) genericObj); | ||
| case LIST: | ||
| return builder.field(EXT_BUILDER_NAME.getPreferredName(), (List<Object>) genericObj); | ||
| default: | ||
| return null; | ||
| } | ||
| } | ||
|
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| // We need this for the equals method. | ||
| Object getValue() { | ||
| return genericObj; | ||
| } | ||
|
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| @Override | ||
| public int hashCode() { | ||
| return Objects.hash(this.valueType, this.genericObj); | ||
| } | ||
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| @Override | ||
| public boolean equals(Object obj) { | ||
| if (obj == null) { | ||
| return false; | ||
| } | ||
| if (!(obj instanceof GenericSearchExtBuilder)) { | ||
| return false; | ||
| } | ||
| return Objects.equals(getValue(), ((GenericSearchExtBuilder) obj).getValue()) | ||
| && Objects.equals(valueType, ((GenericSearchExtBuilder) obj).valueType); | ||
| } | ||
| } |
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